^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/binfmt_elf.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * These are the functions used to load ELF format executables as used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * on SVr4 machines. Information on the format may be found in the book
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Tools".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/log2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/elfcore.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/highuid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/hugetlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/elf-randomize.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/coredump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/sched/coredump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/sched/cputime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/cred.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/dax.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <asm/param.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #ifndef ELF_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #define ELF_COMPAT 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #ifndef user_long_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #define user_long_t long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #ifndef user_siginfo_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #define user_siginfo_t siginfo_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* That's for binfmt_elf_fdpic to deal with */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #ifndef elf_check_fdpic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define elf_check_fdpic(ex) false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static int load_elf_binary(struct linux_binprm *bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #ifdef CONFIG_USELIB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int load_elf_library(struct file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #define load_elf_library NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * If we don't support core dumping, then supply a NULL so we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * don't even try.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #ifdef CONFIG_ELF_CORE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int elf_core_dump(struct coredump_params *cprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #define elf_core_dump NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) #if ELF_EXEC_PAGESIZE > PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #define ELF_MIN_ALIGN PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #ifndef ELF_CORE_EFLAGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define ELF_CORE_EFLAGS 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static struct linux_binfmt elf_format = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) .load_binary = load_elf_binary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) .load_shlib = load_elf_library,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) .core_dump = elf_core_dump,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .min_coredump = ELF_EXEC_PAGESIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #define BAD_ADDR(x) (unlikely((unsigned long)(x) >= TASK_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int set_brk(unsigned long start, unsigned long end, int prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) start = ELF_PAGEALIGN(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) end = ELF_PAGEALIGN(end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (end > start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * Map the last of the bss segment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * If the header is requesting these pages to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * executable, honour that (ppc32 needs this).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int error = vm_brk_flags(start, end - start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) prot & PROT_EXEC ? VM_EXEC : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) current->mm->start_brk = current->mm->brk = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* We need to explicitly zero any fractional pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) after the data section (i.e. bss). This would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) contain the junk from the file that should not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) be in memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static int padzero(unsigned long elf_bss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) unsigned long nbyte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) nbyte = ELF_PAGEOFFSET(elf_bss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (nbyte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) nbyte = ELF_MIN_ALIGN - nbyte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (clear_user((void __user *) elf_bss, nbyte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* Let's use some macros to make this stack manipulation a little clearer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #ifdef CONFIG_STACK_GROWSUP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) #define STACK_ROUND(sp, items) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #define STACK_ALLOC(sp, len) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) old_sp; })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) #define STACK_ROUND(sp, items) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) (((unsigned long) (sp - items)) &~ 15UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) #ifndef ELF_BASE_PLATFORM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * will be copied to the user stack in the same manner as AT_PLATFORM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) #define ELF_BASE_PLATFORM NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) unsigned long interp_load_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) unsigned long e_entry, unsigned long phdr_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct mm_struct *mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) unsigned long p = bprm->p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) int argc = bprm->argc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int envc = bprm->envc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) elf_addr_t __user *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) elf_addr_t __user *u_platform;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) elf_addr_t __user *u_base_platform;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) elf_addr_t __user *u_rand_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) const char *k_platform = ELF_PLATFORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) const char *k_base_platform = ELF_BASE_PLATFORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) unsigned char k_rand_bytes[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) int items;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) elf_addr_t *elf_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) int ei_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) const struct cred *cred = current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * In some cases (e.g. Hyper-Threading), we want to avoid L1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * evictions by the processes running on the same package. One
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * thing we can do is to shuffle the initial stack for them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) p = arch_align_stack(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * If this architecture has a platform capability string, copy it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * to userspace. In some cases (Sparc), this info is impossible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * for userspace to get any other way, in others (i386) it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * merely difficult.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) u_platform = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (k_platform) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) size_t len = strlen(k_platform) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (copy_to_user(u_platform, k_platform, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * If this architecture has a "base" platform capability
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * string, copy it to userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) u_base_platform = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (k_base_platform) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) size_t len = strlen(k_base_platform) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (copy_to_user(u_base_platform, k_base_platform, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * Generate 16 random bytes for userspace PRNG seeding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) u_rand_bytes = (elf_addr_t __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) STACK_ALLOC(p, sizeof(k_rand_bytes));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /* Create the ELF interpreter info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) elf_info = (elf_addr_t *)mm->saved_auxv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) #define NEW_AUX_ENT(id, val) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) *elf_info++ = id; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) *elf_info++ = val; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) #ifdef ARCH_DLINFO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * ARCH_DLINFO must come first so PPC can do its special alignment of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * AUXV.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * ARCH_DLINFO changes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) ARCH_DLINFO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) NEW_AUX_ENT(AT_PHDR, phdr_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) NEW_AUX_ENT(AT_BASE, interp_load_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) NEW_AUX_ENT(AT_FLAGS, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) NEW_AUX_ENT(AT_ENTRY, e_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) NEW_AUX_ENT(AT_SECURE, bprm->secureexec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) #ifdef ELF_HWCAP2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) NEW_AUX_ENT(AT_EXECFN, bprm->exec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (k_platform) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) NEW_AUX_ENT(AT_PLATFORM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) (elf_addr_t)(unsigned long)u_platform);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (k_base_platform) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) NEW_AUX_ENT(AT_BASE_PLATFORM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) (elf_addr_t)(unsigned long)u_base_platform);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (bprm->have_execfd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) #undef NEW_AUX_ENT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) /* AT_NULL is zero; clear the rest too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) memset(elf_info, 0, (char *)mm->saved_auxv +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) sizeof(mm->saved_auxv) - (char *)elf_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) /* And advance past the AT_NULL entry. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) elf_info += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) ei_index = elf_info - (elf_addr_t *)mm->saved_auxv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) sp = STACK_ADD(p, ei_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) items = (argc + 1) + (envc + 1) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) bprm->p = STACK_ROUND(sp, items);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /* Point sp at the lowest address on the stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) #ifdef CONFIG_STACK_GROWSUP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) sp = (elf_addr_t __user *)bprm->p - items - ei_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) sp = (elf_addr_t __user *)bprm->p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * Grow the stack manually; some architectures have a limit on how
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * far ahead a user-space access may be in order to grow the stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (mmap_read_lock_killable(mm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) vma = find_extend_vma(mm, bprm->p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (!vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) /* Now, let's put argc (and argv, envp if appropriate) on the stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (put_user(argc, sp++))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /* Populate list of argv pointers back to argv strings. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) p = mm->arg_end = mm->arg_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) while (argc-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (put_user((elf_addr_t)p, sp++))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) if (!len || len > MAX_ARG_STRLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) p += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (put_user(0, sp++))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) mm->arg_end = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /* Populate list of envp pointers back to envp strings. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) mm->env_end = mm->env_start = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) while (envc-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (put_user((elf_addr_t)p, sp++))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (!len || len > MAX_ARG_STRLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) p += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (put_user(0, sp++))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) mm->env_end = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) /* Put the elf_info on the stack in the right place. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (copy_to_user(sp, mm->saved_auxv, ei_index * sizeof(elf_addr_t)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) static unsigned long elf_map(struct file *filep, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) const struct elf_phdr *eppnt, int prot, int type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) unsigned long total_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) unsigned long map_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) addr = ELF_PAGESTART(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) size = ELF_PAGEALIGN(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) /* mmap() will return -EINVAL if given a zero size, but a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * segment with zero filesize is perfectly valid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * total_size is the size of the ELF (interpreter) image.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * The _first_ mmap needs to know the full size, otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * randomization might put this image into an overlapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * position with the ELF binary image. (since size < total_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * So we first map the 'big' image - and unmap the remainder at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * the end. (which unmap is needed for ELF images with holes.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (total_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) total_size = ELF_PAGEALIGN(total_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (!BAD_ADDR(map_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) vm_munmap(map_addr+size, total_size-size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) map_addr = vm_mmap(filep, addr, size, prot, type, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if ((type & MAP_FIXED_NOREPLACE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) PTR_ERR((void *)map_addr) == -EEXIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) pr_info("%d (%s): Uhuuh, elf segment at %px requested but the memory is mapped already\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) task_pid_nr(current), current->comm, (void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return(map_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) static unsigned long total_mapping_size(const struct elf_phdr *cmds, int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) int i, first_idx = -1, last_idx = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) for (i = 0; i < nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) if (cmds[i].p_type == PT_LOAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) last_idx = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) if (first_idx == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) first_idx = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (first_idx == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) ELF_PAGESTART(cmds[first_idx].p_vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) static int elf_read(struct file *file, void *buf, size_t len, loff_t pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) ssize_t rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) rv = kernel_read(file, buf, len, &pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) if (unlikely(rv != len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return (rv < 0) ? rv : -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) static unsigned long maximum_alignment(struct elf_phdr *cmds, int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) unsigned long alignment = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) for (i = 0; i < nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (cmds[i].p_type == PT_LOAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) unsigned long p_align = cmds[i].p_align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) /* skip non-power of two alignments as invalid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (!is_power_of_2(p_align))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) alignment = max(alignment, p_align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) /* ensure we align to at least one page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return ELF_PAGEALIGN(alignment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * load_elf_phdrs() - load ELF program headers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) * @elf_ex: ELF header of the binary whose program headers should be loaded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * @elf_file: the opened ELF binary file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * Loads ELF program headers from the binary file elf_file, which has the ELF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * header pointed to by elf_ex, into a newly allocated array. The caller is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * responsible for freeing the allocated data. Returns an ERR_PTR upon failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static struct elf_phdr *load_elf_phdrs(const struct elfhdr *elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) struct file *elf_file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct elf_phdr *elf_phdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) int retval, err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) unsigned int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * If the size of this structure has changed, then punt, since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * we will be doing the wrong thing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (elf_ex->e_phentsize != sizeof(struct elf_phdr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) /* Sanity check the number of program headers... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) /* ...and their total size. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) size = sizeof(struct elf_phdr) * elf_ex->e_phnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (size == 0 || size > 65536 || size > ELF_MIN_ALIGN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) elf_phdata = kmalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if (!elf_phdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) /* Read in the program headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) retval = elf_read(elf_file, elf_phdata, size, elf_ex->e_phoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (retval < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) err = retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) /* Success! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) kfree(elf_phdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) elf_phdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) #ifndef CONFIG_ARCH_BINFMT_ELF_STATE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * struct arch_elf_state - arch-specific ELF loading state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * This structure is used to preserve architecture specific data during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * the loading of an ELF file, throughout the checking of architecture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * specific ELF headers & through to the point where the ELF load is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) * known to be proceeding (ie. SET_PERSONALITY).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * This implementation is a dummy for architectures which require no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) * specific state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) struct arch_elf_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) #define INIT_ARCH_ELF_STATE {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) * @ehdr: The main ELF header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) * @phdr: The program header to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) * @elf: The open ELF file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) * @is_interp: True if the phdr is from the interpreter of the ELF being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) * loaded, else false.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) * @state: Architecture-specific state preserved throughout the process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) * of loading the ELF.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) * Inspects the program header phdr to validate its correctness and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) * suitability for the system. Called once per ELF program header in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) * interpreter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * with that return code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) static inline int arch_elf_pt_proc(struct elfhdr *ehdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) struct elf_phdr *phdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) struct file *elf, bool is_interp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) struct arch_elf_state *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) /* Dummy implementation, always proceed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * arch_check_elf() - check an ELF executable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * @ehdr: The main ELF header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) * @has_interp: True if the ELF has an interpreter, else false.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * @interp_ehdr: The interpreter's ELF header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * @state: Architecture-specific state preserved throughout the process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) * of loading the ELF.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) * Provides a final opportunity for architecture code to reject the loading
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * of the ELF & cause an exec syscall to return an error. This is called after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * all program headers to be checked by arch_elf_pt_proc have been.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) * with that return code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) struct elfhdr *interp_ehdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) struct arch_elf_state *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) /* Dummy implementation, always proceed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) static inline int make_prot(u32 p_flags, struct arch_elf_state *arch_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) bool has_interp, bool is_interp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) int prot = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) if (p_flags & PF_R)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) prot |= PROT_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) if (p_flags & PF_W)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) prot |= PROT_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) if (p_flags & PF_X)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) prot |= PROT_EXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) return arch_elf_adjust_prot(prot, arch_state, has_interp, is_interp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) /* This is much more generalized than the library routine read function,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) so we keep this separate. Technically the library read function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) is only provided so that we can read a.out libraries that have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) an ELF header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) struct file *interpreter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) unsigned long no_base, struct elf_phdr *interp_elf_phdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) struct arch_elf_state *arch_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) struct elf_phdr *eppnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) unsigned long load_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) int load_addr_set = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) unsigned long last_bss = 0, elf_bss = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) int bss_prot = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) unsigned long error = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) unsigned long total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) /* First of all, some simple consistency checks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (interp_elf_ex->e_type != ET_EXEC &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) interp_elf_ex->e_type != ET_DYN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) if (!elf_check_arch(interp_elf_ex) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) elf_check_fdpic(interp_elf_ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (!interpreter->f_op->mmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) total_size = total_mapping_size(interp_elf_phdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) interp_elf_ex->e_phnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (!total_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) eppnt = interp_elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) if (eppnt->p_type == PT_LOAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) int elf_prot = make_prot(eppnt->p_flags, arch_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) true, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) unsigned long vaddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) unsigned long k, map_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) vaddr = eppnt->p_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) elf_type |= MAP_FIXED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) else if (no_base && interp_elf_ex->e_type == ET_DYN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) load_addr = -vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) map_addr = elf_map(interpreter, load_addr + vaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) eppnt, elf_prot, elf_type, total_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) total_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) error = map_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) if (BAD_ADDR(map_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (!load_addr_set &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) interp_elf_ex->e_type == ET_DYN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) load_addr = map_addr - ELF_PAGESTART(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) load_addr_set = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) * Check to see if the section's size will overflow the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) * allowed task size. Note that p_filesz must always be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) * <= p_memsize so it's only necessary to check p_memsz.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) k = load_addr + eppnt->p_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (BAD_ADDR(k) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) eppnt->p_filesz > eppnt->p_memsz ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) eppnt->p_memsz > TASK_SIZE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) TASK_SIZE - eppnt->p_memsz < k) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) * Find the end of the file mapping for this phdr, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) * keep track of the largest address we see for this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) if (k > elf_bss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) elf_bss = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) * Do the same thing for the memory mapping - between
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * elf_bss and last_bss is the bss section.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) k = load_addr + eppnt->p_vaddr + eppnt->p_memsz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) if (k > last_bss) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) last_bss = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) bss_prot = elf_prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) * Now fill out the bss section: first pad the last page from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) * the file up to the page boundary, and zero it from elf_bss
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) * up to the end of the page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) if (padzero(elf_bss)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) error = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) * Next, align both the file and mem bss up to the page size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) * since this is where elf_bss was just zeroed up to, and where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) * last_bss will end after the vm_brk_flags() below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) elf_bss = ELF_PAGEALIGN(elf_bss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) last_bss = ELF_PAGEALIGN(last_bss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) /* Finally, if there is still more bss to allocate, do it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) if (last_bss > elf_bss) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) error = vm_brk_flags(elf_bss, last_bss - elf_bss,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) bss_prot & PROT_EXEC ? VM_EXEC : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) error = load_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * These are the functions used to load ELF style executables and shared
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * libraries. There is no binary dependent code anywhere else.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) static int parse_elf_property(const char *data, size_t *off, size_t datasz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) struct arch_elf_state *arch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) bool have_prev_type, u32 *prev_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) size_t o, step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) const struct gnu_property *pr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) if (*off == datasz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) if (WARN_ON_ONCE(*off > datasz || *off % ELF_GNU_PROPERTY_ALIGN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) o = *off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) datasz -= *off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) if (datasz < sizeof(*pr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) pr = (const struct gnu_property *)(data + o);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) o += sizeof(*pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) datasz -= sizeof(*pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) if (pr->pr_datasz > datasz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) WARN_ON_ONCE(o % ELF_GNU_PROPERTY_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) step = round_up(pr->pr_datasz, ELF_GNU_PROPERTY_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) if (step > datasz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) /* Properties are supposed to be unique and sorted on pr_type: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (have_prev_type && pr->pr_type <= *prev_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) *prev_type = pr->pr_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) ret = arch_parse_elf_property(pr->pr_type, data + o,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) pr->pr_datasz, ELF_COMPAT, arch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) *off = o + step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) #define NOTE_DATA_SZ SZ_1K
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) #define GNU_PROPERTY_TYPE_0_NAME "GNU"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) #define NOTE_NAME_SZ (sizeof(GNU_PROPERTY_TYPE_0_NAME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) static int parse_elf_properties(struct file *f, const struct elf_phdr *phdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) struct arch_elf_state *arch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) struct elf_note nhdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) char data[NOTE_DATA_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) } note;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) loff_t pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) ssize_t n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) size_t off, datasz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) bool have_prev_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) u32 prev_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) if (!IS_ENABLED(CONFIG_ARCH_USE_GNU_PROPERTY) || !phdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) /* load_elf_binary() shouldn't call us unless this is true... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) if (WARN_ON_ONCE(phdr->p_type != PT_GNU_PROPERTY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) /* If the properties are crazy large, that's too bad (for now): */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) if (phdr->p_filesz > sizeof(note))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) pos = phdr->p_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) n = kernel_read(f, ¬e, phdr->p_filesz, &pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) BUILD_BUG_ON(sizeof(note) < sizeof(note.nhdr) + NOTE_NAME_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) note.nhdr.n_namesz != NOTE_NAME_SZ ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) strncmp(note.data + sizeof(note.nhdr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) off = round_up(sizeof(note.nhdr) + NOTE_NAME_SZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) ELF_GNU_PROPERTY_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) if (off > n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (note.nhdr.n_descsz > n - off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) datasz = off + note.nhdr.n_descsz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) have_prev_type = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) ret = parse_elf_property(note.data, &off, datasz, arch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) have_prev_type, &prev_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) have_prev_type = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) } while (!ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) return ret == -ENOENT ? 0 : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) static int load_elf_binary(struct linux_binprm *bprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) struct file *interpreter = NULL; /* to shut gcc up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) unsigned long load_addr, load_bias = 0, phdr_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) int load_addr_set = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) unsigned long error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) struct elf_phdr *elf_property_phdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) unsigned long elf_bss, elf_brk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) int bss_prot = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) int retval, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) unsigned long elf_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) unsigned long e_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) unsigned long interp_load_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) unsigned long start_code, end_code, start_data, end_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) unsigned long reloc_func_desc __maybe_unused = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) int executable_stack = EXSTACK_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) struct elfhdr *elf_ex = (struct elfhdr *)bprm->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) struct elfhdr *interp_elf_ex = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) struct pt_regs *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) retval = -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) /* First of all, some simple consistency checks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) if (memcmp(elf_ex->e_ident, ELFMAG, SELFMAG) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) if (elf_ex->e_type != ET_EXEC && elf_ex->e_type != ET_DYN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) if (!elf_check_arch(elf_ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) if (elf_check_fdpic(elf_ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) if (!bprm->file->f_op->mmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) elf_phdata = load_elf_phdrs(elf_ex, bprm->file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) if (!elf_phdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) elf_ppnt = elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) for (i = 0; i < elf_ex->e_phnum; i++, elf_ppnt++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) char *elf_interpreter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) if (elf_ppnt->p_type == PT_GNU_PROPERTY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) elf_property_phdata = elf_ppnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) if (elf_ppnt->p_type != PT_INTERP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) * This is the program interpreter used for shared libraries -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) * for now assume that this is an a.out format binary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) retval = -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) if (elf_ppnt->p_filesz > PATH_MAX || elf_ppnt->p_filesz < 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) elf_interpreter = kmalloc(elf_ppnt->p_filesz, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) if (!elf_interpreter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) retval = elf_read(bprm->file, elf_interpreter, elf_ppnt->p_filesz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) elf_ppnt->p_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) goto out_free_interp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) /* make sure path is NULL terminated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) retval = -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) goto out_free_interp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) interpreter = open_exec(elf_interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) kfree(elf_interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) retval = PTR_ERR(interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) if (IS_ERR(interpreter))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) * If the binary is not readable then enforce mm->dumpable = 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) * regardless of the interpreter's permissions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) would_dump(bprm, interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) interp_elf_ex = kmalloc(sizeof(*interp_elf_ex), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) if (!interp_elf_ex) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) /* Get the exec headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) retval = elf_read(interpreter, interp_elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) sizeof(*interp_elf_ex), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) out_free_interp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) kfree(elf_interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) elf_ppnt = elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) for (i = 0; i < elf_ex->e_phnum; i++, elf_ppnt++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) switch (elf_ppnt->p_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) case PT_GNU_STACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (elf_ppnt->p_flags & PF_X)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) executable_stack = EXSTACK_ENABLE_X;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) executable_stack = EXSTACK_DISABLE_X;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) case PT_LOPROC ... PT_HIPROC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) retval = arch_elf_pt_proc(elf_ex, elf_ppnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) bprm->file, false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) &arch_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) /* Some simple consistency checks for the interpreter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) if (interpreter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) retval = -ELIBBAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) /* Not an ELF interpreter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) if (memcmp(interp_elf_ex->e_ident, ELFMAG, SELFMAG) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) /* Verify the interpreter has a valid arch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) if (!elf_check_arch(interp_elf_ex) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) elf_check_fdpic(interp_elf_ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) /* Load the interpreter program headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) interp_elf_phdata = load_elf_phdrs(interp_elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) if (!interp_elf_phdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) /* Pass PT_LOPROC..PT_HIPROC headers to arch code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) elf_property_phdata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) elf_ppnt = interp_elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) for (i = 0; i < interp_elf_ex->e_phnum; i++, elf_ppnt++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) switch (elf_ppnt->p_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) case PT_GNU_PROPERTY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) elf_property_phdata = elf_ppnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) case PT_LOPROC ... PT_HIPROC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) retval = arch_elf_pt_proc(interp_elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) elf_ppnt, interpreter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) true, &arch_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) retval = parse_elf_properties(interpreter ?: bprm->file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) elf_property_phdata, &arch_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * Allow arch code to reject the ELF at this point, whilst it's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * still possible to return an error to the code that invoked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) * the exec syscall.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) retval = arch_check_elf(elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) !!interpreter, interp_elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) &arch_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) /* Flush all traces of the currently running executable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) retval = begin_new_exec(bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) /* Do this immediately, since STACK_TOP as used in setup_arg_pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) may depend on the personality. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) SET_PERSONALITY2(*elf_ex, &arch_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if (elf_read_implies_exec(*elf_ex, executable_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) current->personality |= READ_IMPLIES_EXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) current->flags |= PF_RANDOMIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) setup_new_exec(bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) /* Do this so that we can load the interpreter, if need be. We will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) change some of these later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) executable_stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) elf_bss = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) elf_brk = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) start_code = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) end_code = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) start_data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) end_data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) /* Now we do a little grungy work by mmapping the ELF image into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) the correct location in memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) for(i = 0, elf_ppnt = elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) i < elf_ex->e_phnum; i++, elf_ppnt++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) int elf_prot, elf_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) unsigned long k, vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) unsigned long total_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) unsigned long alignment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) if (elf_ppnt->p_type != PT_LOAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) if (unlikely (elf_brk > elf_bss)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) unsigned long nbyte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) /* There was a PT_LOAD segment with p_memsz > p_filesz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) before this one. Map anonymous pages, if needed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) and clear the area. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) retval = set_brk(elf_bss + load_bias,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) elf_brk + load_bias,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) bss_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) nbyte = ELF_PAGEOFFSET(elf_bss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) if (nbyte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) nbyte = ELF_MIN_ALIGN - nbyte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) if (nbyte > elf_brk - elf_bss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) nbyte = elf_brk - elf_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) if (clear_user((void __user *)elf_bss +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) load_bias, nbyte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) * This bss-zeroing can fail if the ELF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) * file specifies odd protections. So
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) * we don't check the return value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) elf_prot = make_prot(elf_ppnt->p_flags, &arch_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) !!interpreter, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) vaddr = elf_ppnt->p_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) * If we are loading ET_EXEC or we have already performed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) * the ET_DYN load_addr calculations, proceed normally.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) if (elf_ex->e_type == ET_EXEC || load_addr_set) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) elf_flags |= MAP_FIXED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) } else if (elf_ex->e_type == ET_DYN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) * This logic is run once for the first LOAD Program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) * Header for ET_DYN binaries to calculate the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) * randomization (load_bias) for all the LOAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) * Program Headers, and to calculate the entire
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) * size of the ELF mapping (total_size). (Note that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) * load_addr_set is set to true later once the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) * initial mapping is performed.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) * There are effectively two types of ET_DYN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) * binaries: programs (i.e. PIE: ET_DYN with INTERP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) * and loaders (ET_DYN without INTERP, since they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) * _are_ the ELF interpreter). The loaders must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) * be loaded away from programs since the program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) * may otherwise collide with the loader (especially
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) * for ET_EXEC which does not have a randomized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) * position). For example to handle invocations of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) * "./ld.so someprog" to test out a new version of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) * the loader, the subsequent program that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) * loader loads must avoid the loader itself, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) * they cannot share the same load range. Sufficient
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) * room for the brk must be allocated with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) * loader as well, since brk must be available with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) * the loader.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) * Therefore, programs are loaded offset from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) * ELF_ET_DYN_BASE and loaders are loaded into the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) * independently randomized mmap region (0 load_bias
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) * without MAP_FIXED).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) if (interpreter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) load_bias = ELF_ET_DYN_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) if (current->flags & PF_RANDOMIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) load_bias += arch_mmap_rnd();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) if (alignment)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) load_bias &= ~(alignment - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) elf_flags |= MAP_FIXED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) load_bias = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) * Since load_bias is used for all subsequent loading
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) * calculations, we must lower it by the first vaddr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) * so that the remaining calculations based on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) * ELF vaddrs will be correctly offset. The result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) * is then page aligned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) load_bias = ELF_PAGESTART(load_bias - vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) total_size = total_mapping_size(elf_phdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) elf_ex->e_phnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) if (!total_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) elf_prot, elf_flags, total_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) if (BAD_ADDR(error)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) retval = IS_ERR((void *)error) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) PTR_ERR((void*)error) : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) if (!load_addr_set) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) load_addr_set = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) if (elf_ex->e_type == ET_DYN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) load_bias += error -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) ELF_PAGESTART(load_bias + vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) load_addr += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) reloc_func_desc = load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) * Figure out which segment in the file contains the Program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) * Header table, and map to the associated memory address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) if (elf_ppnt->p_offset <= elf_ex->e_phoff &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) elf_ex->e_phoff < elf_ppnt->p_offset + elf_ppnt->p_filesz) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) phdr_addr = elf_ex->e_phoff - elf_ppnt->p_offset +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) elf_ppnt->p_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) k = elf_ppnt->p_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) if ((elf_ppnt->p_flags & PF_X) && k < start_code)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) start_code = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) if (start_data < k)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) start_data = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) * Check to see if the section's size will overflow the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) * allowed task size. Note that p_filesz must always be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) * <= p_memsz so it is only necessary to check p_memsz.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) elf_ppnt->p_memsz > TASK_SIZE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) TASK_SIZE - elf_ppnt->p_memsz < k) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) /* set_brk can never work. Avoid overflows. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (k > elf_bss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) elf_bss = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) if ((elf_ppnt->p_flags & PF_X) && end_code < k)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) end_code = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) if (end_data < k)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) end_data = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) if (k > elf_brk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) bss_prot = elf_prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) elf_brk = k;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) e_entry = elf_ex->e_entry + load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) phdr_addr += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) elf_bss += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) elf_brk += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) start_code += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) end_code += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) start_data += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) end_data += load_bias;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) /* Calling set_brk effectively mmaps the pages that we need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) * for the bss and break sections. We must do this before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) * mapping in the interpreter, to make sure it doesn't wind
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) * up getting placed where the bss needs to go.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) retval = set_brk(elf_bss, elf_brk, bss_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) retval = -EFAULT; /* Nobody gets to see this, but.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) if (interpreter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) elf_entry = load_elf_interp(interp_elf_ex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) interpreter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) load_bias, interp_elf_phdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) &arch_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) if (!IS_ERR((void *)elf_entry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) * load_elf_interp() returns relocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) * adjustment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) interp_load_addr = elf_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) elf_entry += interp_elf_ex->e_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) if (BAD_ADDR(elf_entry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) retval = IS_ERR((void *)elf_entry) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) (int)elf_entry : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) reloc_func_desc = interp_load_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) allow_write_access(interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) fput(interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) kfree(interp_elf_ex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) kfree(interp_elf_phdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) elf_entry = e_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) if (BAD_ADDR(elf_entry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) goto out_free_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) kfree(elf_phdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) set_binfmt(&elf_format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) retval = arch_setup_additional_pages(bprm, !!interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) retval = create_elf_tables(bprm, elf_ex, interp_load_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) e_entry, phdr_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) mm->end_code = end_code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) mm->start_code = start_code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) mm->start_data = start_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) mm->end_data = end_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) mm->start_stack = bprm->p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) * For architectures with ELF randomization, when executing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) * a loader directly (i.e. no interpreter listed in ELF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) * headers), move the brk area out of the mmap region
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) * (since it grows up, and may collide early with the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) * growing down), and into the unused ELF_ET_DYN_BASE region.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) if (IS_ENABLED(CONFIG_ARCH_HAS_ELF_RANDOMIZE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) elf_ex->e_type == ET_DYN && !interpreter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) mm->brk = mm->start_brk = ELF_ET_DYN_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) mm->brk = mm->start_brk = arch_randomize_brk(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) #ifdef compat_brk_randomized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) current->brk_randomized = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) if (current->personality & MMAP_PAGE_ZERO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) and some applications "depend" upon this behavior.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) Since we do not have the power to recompile these, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) emulate the SVr4 behavior. Sigh. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) MAP_FIXED | MAP_PRIVATE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) #ifdef ELF_PLAT_INIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) * The ABI may specify that certain registers be set up in special
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) * ways (on i386 %edx is the address of a DT_FINI function, for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) * example. In addition, it may also specify (eg, PowerPC64 ELF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) * that the e_entry field is the address of the function descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) * for the startup routine, rather than the address of the startup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) * routine itself. This macro performs whatever initialization to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) * the regs structure is required as well as any relocations to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) * function descriptor entries when executing dynamically links apps.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) ELF_PLAT_INIT(regs, reloc_func_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) finalize_exec(bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) start_thread(regs, elf_entry, bprm->p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) /* error cleanup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) out_free_dentry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) kfree(interp_elf_ex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) kfree(interp_elf_phdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) allow_write_access(interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) if (interpreter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) fput(interpreter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) out_free_ph:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) kfree(elf_phdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) #ifdef CONFIG_USELIB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) /* This is really simpleminded and specialized - we are loading an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) a.out library that is given an ELF header. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) static int load_elf_library(struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) struct elf_phdr *elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) struct elf_phdr *eppnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) unsigned long elf_bss, bss, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) int retval, error, i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) struct elfhdr elf_ex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) error = -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) retval = elf_read(file, &elf_ex, sizeof(elf_ex), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) /* First of all, some simple consistency checks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) !elf_check_arch(&elf_ex) || !file->f_op->mmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) if (elf_check_fdpic(&elf_ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) /* Now read in all of the header information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) elf_phdata = kmalloc(j, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) if (!elf_phdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) eppnt = elf_phdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) error = -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) retval = elf_read(file, eppnt, j, elf_ex.e_phoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) if ((eppnt + i)->p_type == PT_LOAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) if (j != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) while (eppnt->p_type != PT_LOAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) eppnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) /* Now use mmap to map the library into memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) error = vm_mmap(file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) ELF_PAGESTART(eppnt->p_vaddr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) (eppnt->p_filesz +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) ELF_PAGEOFFSET(eppnt->p_vaddr)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) PROT_READ | PROT_WRITE | PROT_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) MAP_FIXED_NOREPLACE | MAP_PRIVATE | MAP_DENYWRITE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) (eppnt->p_offset -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) ELF_PAGEOFFSET(eppnt->p_vaddr)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) if (error != ELF_PAGESTART(eppnt->p_vaddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) if (padzero(elf_bss)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) error = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) len = ELF_PAGEALIGN(eppnt->p_filesz + eppnt->p_vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) bss = ELF_PAGEALIGN(eppnt->p_memsz + eppnt->p_vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) if (bss > len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) error = vm_brk(len, bss - len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) goto out_free_ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) out_free_ph:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) kfree(elf_phdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) #endif /* #ifdef CONFIG_USELIB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) #ifdef CONFIG_ELF_CORE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) * ELF core dumper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) * Modelled on fs/exec.c:aout_core_dump()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) * Jeremy Fitzhardinge <jeremy@sw.oz.au>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) /* An ELF note in memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) struct memelfnote
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) unsigned int datasz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) void *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) static int notesize(struct memelfnote *en)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) int sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) sz = sizeof(struct elf_note);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) sz += roundup(strlen(en->name) + 1, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) sz += roundup(en->datasz, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) return sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) static int writenote(struct memelfnote *men, struct coredump_params *cprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) struct elf_note en;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) en.n_namesz = strlen(men->name) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) en.n_descsz = men->datasz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) en.n_type = men->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) return dump_emit(cprm, &en, sizeof(en)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) static void fill_elf_header(struct elfhdr *elf, int segs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) u16 machine, u32 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) memset(elf, 0, sizeof(*elf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) memcpy(elf->e_ident, ELFMAG, SELFMAG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) elf->e_ident[EI_CLASS] = ELF_CLASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) elf->e_ident[EI_DATA] = ELF_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) elf->e_ident[EI_VERSION] = EV_CURRENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) elf->e_ident[EI_OSABI] = ELF_OSABI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) elf->e_type = ET_CORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) elf->e_machine = machine;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) elf->e_version = EV_CURRENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) elf->e_phoff = sizeof(struct elfhdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) elf->e_flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) elf->e_ehsize = sizeof(struct elfhdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) elf->e_phentsize = sizeof(struct elf_phdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) elf->e_phnum = segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) phdr->p_type = PT_NOTE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) phdr->p_offset = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) phdr->p_vaddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) phdr->p_paddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) phdr->p_filesz = sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) phdr->p_memsz = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) phdr->p_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) phdr->p_align = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) static void fill_note(struct memelfnote *note, const char *name, int type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) unsigned int sz, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) note->name = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) note->type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) note->datasz = sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) note->data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) * fill up all the fields in prstatus from the given task struct, except
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) * registers which need to be filled up separately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) static void fill_prstatus(struct elf_prstatus *prstatus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) struct task_struct *p, long signr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) prstatus->pr_sigpend = p->pending.signal.sig[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) prstatus->pr_sighold = p->blocked.sig[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) prstatus->pr_pid = task_pid_vnr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) prstatus->pr_pgrp = task_pgrp_vnr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) prstatus->pr_sid = task_session_vnr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) if (thread_group_leader(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) struct task_cputime cputime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) * This is the record for the group leader. It shows the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) * group-wide total, not its individual thread total.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) thread_group_cputime(p, &cputime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) u64 utime, stime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) task_cputime(p, &utime, &stime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) prstatus->pr_utime = ns_to_kernel_old_timeval(utime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) prstatus->pr_stime = ns_to_kernel_old_timeval(stime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) const struct cred *cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) unsigned int i, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) /* first copy the parameters from user space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) memset(psinfo, 0, sizeof(struct elf_prpsinfo));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) len = mm->arg_end - mm->arg_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) if (len >= ELF_PRARGSZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) len = ELF_PRARGSZ-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) if (copy_from_user(&psinfo->pr_psargs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) (const char __user *)mm->arg_start, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) for(i = 0; i < len; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) if (psinfo->pr_psargs[i] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) psinfo->pr_psargs[i] = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) psinfo->pr_psargs[len] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) psinfo->pr_pid = task_pid_vnr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) psinfo->pr_pgrp = task_pgrp_vnr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) psinfo->pr_sid = task_session_vnr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) i = p->state ? ffz(~p->state) + 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) psinfo->pr_state = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) psinfo->pr_zomb = psinfo->pr_sname == 'Z';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) psinfo->pr_nice = task_nice(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) psinfo->pr_flag = p->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) cred = __task_cred(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) i += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) while (auxv[i - 2] != AT_NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) const kernel_siginfo_t *siginfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) copy_siginfo_to_external(csigdata, siginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) #define MAX_FILE_NOTE_SIZE (4*1024*1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) * Format of NT_FILE note:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) * long count -- how many files are mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) * long page_size -- units for file_ofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) * array of [COUNT] elements of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) * long start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) * long end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) * long file_ofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) static int fill_files_note(struct memelfnote *note)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) struct mm_struct *mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) unsigned count, size, names_ofs, remaining, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) user_long_t *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) user_long_t *start_end_ofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) char *name_base, *name_curpos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) /* *Estimated* file count and total data size needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) count = mm->map_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) if (count > UINT_MAX / 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) size = count * 64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) names_ofs = (2 + 3 * count) * sizeof(data[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) alloc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) size = round_up(size, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) * "size" can be 0 here legitimately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) * Let it ENOMEM and omit NT_FILE section which will be empty anyway.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) data = kvmalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) if (ZERO_OR_NULL_PTR(data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) start_end_ofs = data + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) name_base = name_curpos = ((char *)data) + names_ofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) remaining = size - names_ofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) for (vma = mm->mmap; vma != NULL; vma = vma->vm_next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) struct file *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) const char *filename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) file = vma->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) if (!file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) filename = file_path(file, name_curpos, remaining);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) if (IS_ERR(filename)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) if (PTR_ERR(filename) == -ENAMETOOLONG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) kvfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) size = size * 5 / 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) goto alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) /* file_path() fills at the end, move name down */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) /* n = strlen(filename) + 1: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) n = (name_curpos + remaining) - filename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) remaining = filename - name_curpos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) memmove(name_curpos, filename, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) name_curpos += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) *start_end_ofs++ = vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) *start_end_ofs++ = vma->vm_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) *start_end_ofs++ = vma->vm_pgoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) /* Now we know exact count of files, can store it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) data[0] = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) data[1] = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) * Count usually is less than mm->map_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) * we need to move filenames down.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) n = mm->map_count - count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) if (n != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) unsigned shift_bytes = n * 3 * sizeof(data[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) memmove(name_base - shift_bytes, name_base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) name_curpos - name_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) name_curpos -= shift_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) size = name_curpos - (char *)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) fill_note(note, "CORE", NT_FILE, size, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) #ifdef CORE_DUMP_USE_REGSET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) #include <linux/regset.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) struct elf_thread_core_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) struct elf_thread_core_info *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) struct task_struct *task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) struct elf_prstatus prstatus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) struct memelfnote notes[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) struct elf_note_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) struct elf_thread_core_info *thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) struct memelfnote psinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) struct memelfnote signote;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) struct memelfnote auxv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) struct memelfnote files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) user_siginfo_t csigdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) int thread_notes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) * When a regset has a writeback hook, we call it on each thread before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) * dumping user memory. On register window machines, this makes sure the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) * user memory backing the register data is up to date before we read it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) static void do_thread_regset_writeback(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) const struct user_regset *regset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) if (regset->writeback)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) regset->writeback(task, regset, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) #ifndef PRSTATUS_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) #define PRSTATUS_SIZE(S, R) sizeof(S)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) #ifndef SET_PR_FPVALID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) #define SET_PR_FPVALID(S, V, R) ((S)->pr_fpvalid = (V))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) static int fill_thread_core_info(struct elf_thread_core_info *t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) const struct user_regset_view *view,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) long signr, size_t *total)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) int regset0_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) * NT_PRSTATUS is the one special case, because the regset data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) * goes into the pr_reg field inside the note contents, rather
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) * than being the whole note contents. We fill the reset in here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) * We assume that regset 0 is NT_PRSTATUS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) fill_prstatus(&t->prstatus, t->task, signr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753) regset0_size = regset_get(t->task, &view->regsets[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) if (regset0_size < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) PRSTATUS_SIZE(t->prstatus, regset0_size), &t->prstatus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) *total += notesize(&t->notes[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) do_thread_regset_writeback(t->task, &view->regsets[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) * Each other regset might generate a note too. For each regset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) * that has no core_note_type or is inactive, we leave t->notes[i]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) * all zero and we'll know to skip writing it later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) for (i = 1; i < view->n; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) const struct user_regset *regset = &view->regsets[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) int note_type = regset->core_note_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) bool is_fpreg = note_type == NT_PRFPREG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) void *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) do_thread_regset_writeback(t->task, regset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) if (!note_type) // not for coredumps
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) if (regset->active && regset->active(t->task, regset) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) ret = regset_get_alloc(t->task, regset, ~0U, &data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) if (is_fpreg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) SET_PR_FPVALID(&t->prstatus, 1, regset0_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) fill_note(&t->notes[i], is_fpreg ? "CORE" : "LINUX",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) note_type, ret, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) *total += notesize(&t->notes[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) static int fill_note_info(struct elfhdr *elf, int phdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) struct elf_note_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) struct coredump_params *cprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) struct task_struct *dump_task = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) const struct user_regset_view *view = task_user_regset_view(dump_task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) struct elf_thread_core_info *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) struct elf_prpsinfo *psinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) struct core_thread *ct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) info->size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) info->thread = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) if (psinfo == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) info->psinfo.data = NULL; /* So we don't free this wrongly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) * Figure out how many notes we're going to need for each thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) info->thread_notes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) for (i = 0; i < view->n; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) if (view->regsets[i].core_note_type != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) ++info->thread_notes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) * Sanity check. We rely on regset 0 being in NT_PRSTATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) * since it is our one special case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) if (unlikely(info->thread_notes == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) * Initialize the ELF file header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) fill_elf_header(elf, phdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) view->e_machine, view->e_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) * Allocate a structure for each thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) t = kzalloc(offsetof(struct elf_thread_core_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) notes[info->thread_notes]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) if (unlikely(!t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) t->task = ct->task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) if (ct->task == dump_task || !info->thread) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) t->next = info->thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857) info->thread = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) * Make sure to keep the original task at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) * the head of the list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) t->next = info->thread->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) info->thread->next = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) * Now fill in each thread's information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) for (t = info->thread; t != NULL; t = t->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) if (!fill_thread_core_info(t, view, cprm->siginfo->si_signo, &info->size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) * Fill in the two process-wide notes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) info->size += notesize(&info->psinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) fill_siginfo_note(&info->signote, &info->csigdata, cprm->siginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) info->size += notesize(&info->signote);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) fill_auxv_note(&info->auxv, current->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) info->size += notesize(&info->auxv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) if (fill_files_note(&info->files) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) info->size += notesize(&info->files);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) static size_t get_note_info_size(struct elf_note_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) return info->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) * Write all the notes for each thread. When writing the first thread, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) * process-wide notes are interleaved after the first thread-specific note.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) static int write_note_info(struct elf_note_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) struct coredump_params *cprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) bool first = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906) struct elf_thread_core_info *t = info->thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) if (!writenote(&t->notes[0], cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) if (first && !writenote(&info->psinfo, cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) if (first && !writenote(&info->signote, cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) if (first && !writenote(&info->auxv, cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) if (first && info->files.data &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) !writenote(&info->files, cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) for (i = 1; i < info->thread_notes; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) if (t->notes[i].data &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) !writenote(&t->notes[i], cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) first = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) t = t->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) } while (t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) static void free_note_info(struct elf_note_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) struct elf_thread_core_info *threads = info->thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) while (threads) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) struct elf_thread_core_info *t = threads;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) threads = t->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) for (i = 1; i < info->thread_notes; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945) kfree(t->notes[i].data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) kfree(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948) kfree(info->psinfo.data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) kvfree(info->files.data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) /* Here is the structure in which status of each thread is captured. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) struct elf_thread_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) struct elf_prstatus prstatus; /* NT_PRSTATUS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) elf_fpregset_t fpu; /* NT_PRFPREG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960) struct task_struct *thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) struct memelfnote notes[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) int num_notes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966) * In order to add the specific thread information for the elf file format,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) * we need to keep a linked list of every threads pr_status and then create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) * a single section for them in the final core file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) int sz = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) struct task_struct *p = t->thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) t->num_notes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976) fill_prstatus(&t->prstatus, p, signr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977) elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979) fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980) &(t->prstatus));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) t->num_notes++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) sz += notesize(&t->notes[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984) if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985) &t->fpu))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987) &(t->fpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988) t->num_notes++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989) sz += notesize(&t->notes[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991) return sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994) struct elf_note_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) struct memelfnote *notes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996) struct memelfnote *notes_files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997) struct elf_prstatus *prstatus; /* NT_PRSTATUS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999) struct list_head thread_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000) elf_fpregset_t *fpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001) user_siginfo_t csigdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) int thread_status_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003) int numnote;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006) static int elf_note_info_init(struct elf_note_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008) memset(info, 0, sizeof(*info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009) INIT_LIST_HEAD(&info->thread_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011) /* Allocate space for ELF notes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012) info->notes = kmalloc_array(8, sizeof(struct memelfnote), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013) if (!info->notes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015) info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016) if (!info->psinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018) info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019) if (!info->prstatus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022) if (!info->fpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027) static int fill_note_info(struct elfhdr *elf, int phdrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) struct elf_note_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029) struct coredump_params *cprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2030) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2031) struct core_thread *ct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2032) struct elf_thread_status *ets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2034) if (!elf_note_info_init(info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2035) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2037) for (ct = current->mm->core_state->dumper.next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2038) ct; ct = ct->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2039) ets = kzalloc(sizeof(*ets), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2040) if (!ets)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2041) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2043) ets->thread = ct->task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2044) list_add(&ets->list, &info->thread_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2045) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2047) list_for_each_entry(ets, &info->thread_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2048) int sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2050) sz = elf_dump_thread_status(cprm->siginfo->si_signo, ets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2051) info->thread_status_size += sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2052) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2053) /* now collect the dump for the current */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2054) memset(info->prstatus, 0, sizeof(*info->prstatus));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2055) fill_prstatus(info->prstatus, current, cprm->siginfo->si_signo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2056) elf_core_copy_regs(&info->prstatus->pr_reg, cprm->regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2058) /* Set up header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2059) fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2060)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2061) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2062) * Set up the notes in similar form to SVR4 core dumps made
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2063) * with info from their /proc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2064) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2065)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2066) fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2067) sizeof(*info->prstatus), info->prstatus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2068) fill_psinfo(info->psinfo, current->group_leader, current->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2069) fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2070) sizeof(*info->psinfo), info->psinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2072) fill_siginfo_note(info->notes + 2, &info->csigdata, cprm->siginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2073) fill_auxv_note(info->notes + 3, current->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2074) info->numnote = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2075)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2076) if (fill_files_note(info->notes + info->numnote) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2077) info->notes_files = info->notes + info->numnote;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2078) info->numnote++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2079) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2081) /* Try to dump the FPU. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2082) info->prstatus->pr_fpvalid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2083) elf_core_copy_task_fpregs(current, cprm->regs, info->fpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2084) if (info->prstatus->pr_fpvalid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2085) fill_note(info->notes + info->numnote++,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2086) "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2087) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2088) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2089)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2090) static size_t get_note_info_size(struct elf_note_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2091) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2092) int sz = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2093) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2094)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2095) for (i = 0; i < info->numnote; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2096) sz += notesize(info->notes + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2098) sz += info->thread_status_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2099)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2100) return sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2103) static int write_note_info(struct elf_note_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2104) struct coredump_params *cprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2106) struct elf_thread_status *ets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2107) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2109) for (i = 0; i < info->numnote; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2110) if (!writenote(info->notes + i, cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2111) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2113) /* write out the thread status notes section */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2114) list_for_each_entry(ets, &info->thread_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2115) for (i = 0; i < ets->num_notes; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2116) if (!writenote(&ets->notes[i], cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2120) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2123) static void free_note_info(struct elf_note_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2125) while (!list_empty(&info->thread_list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2126) struct list_head *tmp = info->thread_list.next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2127) list_del(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2128) kfree(list_entry(tmp, struct elf_thread_status, list));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2131) /* Free data possibly allocated by fill_files_note(): */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2132) if (info->notes_files)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2133) kvfree(info->notes_files->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2135) kfree(info->prstatus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2136) kfree(info->psinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2137) kfree(info->notes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2138) kfree(info->fpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2141) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2143) static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2144) elf_addr_t e_shoff, int segs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2146) elf->e_shoff = e_shoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2147) elf->e_shentsize = sizeof(*shdr4extnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2148) elf->e_shnum = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2149) elf->e_shstrndx = SHN_UNDEF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2151) memset(shdr4extnum, 0, sizeof(*shdr4extnum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2153) shdr4extnum->sh_type = SHT_NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2154) shdr4extnum->sh_size = elf->e_shnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2155) shdr4extnum->sh_link = elf->e_shstrndx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2156) shdr4extnum->sh_info = segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2159) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2160) * Actual dumper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2161) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2162) * This is a two-pass process; first we find the offsets of the bits,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2163) * and then they are actually written out. If we run out of core limit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2164) * we just truncate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2165) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2166) static int elf_core_dump(struct coredump_params *cprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2168) int has_dumped = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2169) int vma_count, segs, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2170) size_t vma_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2171) struct elfhdr elf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2172) loff_t offset = 0, dataoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2173) struct elf_note_info info = { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2174) struct elf_phdr *phdr4note = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2175) struct elf_shdr *shdr4extnum = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2176) Elf_Half e_phnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2177) elf_addr_t e_shoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2178) struct core_vma_metadata *vma_meta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2180) if (dump_vma_snapshot(cprm, &vma_count, &vma_meta, &vma_data_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2181) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2183) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2184) * The number of segs are recored into ELF header as 16bit value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2185) * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2187) segs = vma_count + elf_core_extra_phdrs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2189) /* for notes section */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2190) segs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2192) /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2193) * this, kernel supports extended numbering. Have a look at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2194) * include/linux/elf.h for further information. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2195) e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2197) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2198) * Collect all the non-memory information about the process for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2199) * notes. This also sets up the file header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2200) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2201) if (!fill_note_info(&elf, e_phnum, &info, cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2202) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2204) has_dumped = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2206) offset += sizeof(elf); /* Elf header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2207) offset += segs * sizeof(struct elf_phdr); /* Program headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2209) /* Write notes phdr entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2211) size_t sz = get_note_info_size(&info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2213) sz += elf_coredump_extra_notes_size();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2215) phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2216) if (!phdr4note)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2217) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2219) fill_elf_note_phdr(phdr4note, sz, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2220) offset += sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2223) dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2225) offset += vma_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2226) offset += elf_core_extra_data_size();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2227) e_shoff = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2229) if (e_phnum == PN_XNUM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2230) shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2231) if (!shdr4extnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2232) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2233) fill_extnum_info(&elf, shdr4extnum, e_shoff, segs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2236) offset = dataoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2238) if (!dump_emit(cprm, &elf, sizeof(elf)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2239) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2241) if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2242) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2244) /* Write program headers for segments dump */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2245) for (i = 0; i < vma_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2246) struct core_vma_metadata *meta = vma_meta + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2247) struct elf_phdr phdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2249) phdr.p_type = PT_LOAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2250) phdr.p_offset = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2251) phdr.p_vaddr = meta->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2252) phdr.p_paddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2253) phdr.p_filesz = meta->dump_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2254) phdr.p_memsz = meta->end - meta->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2255) offset += phdr.p_filesz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2256) phdr.p_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2257) if (meta->flags & VM_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2258) phdr.p_flags |= PF_R;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2259) if (meta->flags & VM_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2260) phdr.p_flags |= PF_W;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2261) if (meta->flags & VM_EXEC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2262) phdr.p_flags |= PF_X;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2263) phdr.p_align = ELF_EXEC_PAGESIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2265) if (!dump_emit(cprm, &phdr, sizeof(phdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2266) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2269) if (!elf_core_write_extra_phdrs(cprm, offset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2270) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2272) /* write out the notes section */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2273) if (!write_note_info(&info, cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2274) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2276) if (elf_coredump_extra_notes_write(cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2277) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2279) /* Align to page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2280) if (!dump_skip(cprm, dataoff - cprm->pos))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2281) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2283) for (i = 0; i < vma_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2284) struct core_vma_metadata *meta = vma_meta + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2286) if (!dump_user_range(cprm, meta->start, meta->dump_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2287) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2289) dump_truncate(cprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2291) if (!elf_core_write_extra_data(cprm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2292) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2294) if (e_phnum == PN_XNUM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2295) if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2296) goto end_coredump;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2299) end_coredump:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2300) free_note_info(&info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2301) kfree(shdr4extnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2302) kvfree(vma_meta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2303) kfree(phdr4note);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2304) return has_dumped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2307) #endif /* CONFIG_ELF_CORE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2309) static int __init init_elf_binfmt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2311) register_binfmt(&elf_format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2312) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2315) static void __exit exit_elf_binfmt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2316) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2317) /* Remove the COFF and ELF loaders. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2318) unregister_binfmt(&elf_format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2321) core_initcall(init_elf_binfmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2322) module_exit(exit_elf_binfmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2323) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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