Orange Pi5 kernel

^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)  *  a.out loader for x86-64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Hacked together by Andi Kleen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/a.out.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/personality.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/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/perf_event.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <asm/user32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <asm/ia32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #undef WARN_OLD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static int load_aout_binary(struct linux_binprm *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static int load_aout_library(struct file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static struct linux_binfmt aout_format = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	.module		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	.load_binary	= load_aout_binary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	.load_shlib	= load_aout_library,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static int set_brk(unsigned long start, unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	start = PAGE_ALIGN(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	end = PAGE_ALIGN(end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (end <= start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return vm_brk(start, end - start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * create_aout_tables() parses the env- and arg-strings in new user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * memory and creates the pointer tables from them, and puts their
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * addresses on the "stack", returning the new stack pointer value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	u32 __user *argv, *envp, *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	int argc = bprm->argc, envc = bprm->envc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	sp -= envc+1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	envp = sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	sp -= argc+1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	argv = sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	put_user((unsigned long) envp, --sp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	put_user((unsigned long) argv, --sp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	put_user(argc, --sp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	current->mm->arg_start = (unsigned long) p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	while (argc-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		put_user((u32)(unsigned long)p, argv++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			get_user(c, p++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		} while (c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	put_user(0, argv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	while (envc-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		put_user((u32)(unsigned long)p, envp++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			get_user(c, p++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		} while (c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	put_user(0, envp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	current->mm->env_end = (unsigned long) p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * These are the functions used to load a.out style executables and shared
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  * libraries.  There is no binary dependent code anywhere else.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static int load_aout_binary(struct linux_binprm *bprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	unsigned long error, fd_offset, rlim;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	struct exec ex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	ex = *((struct exec *) bprm->buf);		/* exec-header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	     N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	    N_TRSIZE(ex) || N_DRSIZE(ex) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	    i_size_read(file_inode(bprm->file)) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	    ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		return -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	fd_offset = N_TXTOFF(ex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	/* Check initial limits. This avoids letting people circumvent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	 * size limits imposed on them by creating programs with large
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	 * arrays in the data or bss.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	rlim = rlimit(RLIMIT_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (rlim >= RLIM_INFINITY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		rlim = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (ex.a_data + ex.a_bss > rlim)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	/* Flush all traces of the currently running executable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	retval = begin_new_exec(bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	/* OK, This is the point of no return */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	set_personality(PER_LINUX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	set_personality_ia32(false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	setup_new_exec(bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	regs->cs = __USER32_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		regs->r13 = regs->r14 = regs->r15 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	current->mm->end_code = ex.a_text +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		(current->mm->start_code = N_TXTADDR(ex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	current->mm->end_data = ex.a_data +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		(current->mm->start_data = N_DATADDR(ex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	current->mm->brk = ex.a_bss +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		(current->mm->start_brk = N_BSSADDR(ex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (N_MAGIC(ex) == OMAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		unsigned long text_addr, map_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		text_addr = N_TXTADDR(ex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		map_size = ex.a_text+ex.a_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		error = vm_brk(text_addr & PAGE_MASK, map_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		error = read_code(bprm->file, text_addr, 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				  ex.a_text + ex.a_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		if ((signed long)error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) #ifdef WARN_OLD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		static unsigned long error_time, error_time2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		    (N_MAGIC(ex) != NMAGIC) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 				time_after(jiffies, error_time2 + 5*HZ)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			printk(KERN_NOTICE "executable not page aligned\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			error_time2 = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		if ((fd_offset & ~PAGE_MASK) != 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			    time_after(jiffies, error_time + 5*HZ)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			printk(KERN_WARNING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			       "fd_offset is not page aligned. Please convert "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			       "program: %pD\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			       bprm->file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			error_time = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 				return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			read_code(bprm->file, N_TXTADDR(ex), fd_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 					ex.a_text+ex.a_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			goto beyond_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				PROT_READ | PROT_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 				MAP_EXECUTABLE | MAP_32BIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 				fd_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		if (error != N_TXTADDR(ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 				PROT_READ | PROT_WRITE | PROT_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 				MAP_EXECUTABLE | MAP_32BIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 				fd_offset + ex.a_text);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		if (error != N_DATADDR(ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) beyond_if:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	error = set_brk(current->mm->start_brk, current->mm->brk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	set_binfmt(&aout_format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	current->mm->start_stack =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	/* start thread */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	loadsegment(fs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	loadsegment(ds, __USER32_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	loadsegment(es, __USER32_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	load_gs_index(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	(regs)->ip = ex.a_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	(regs)->sp = current->mm->start_stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	(regs)->flags = 0x200;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	(regs)->cs = __USER32_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	(regs)->ss = __USER32_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	regs->r8 = regs->r9 = regs->r10 = regs->r11 =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static int load_aout_library(struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	unsigned long bss, start_addr, len, error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	struct exec ex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	loff_t pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	retval = -ENOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	error = kernel_read(file, &ex, sizeof(ex), &pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (error != sizeof(ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	/* We come in here for the regular a.out style of shared libraries */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	    N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	    i_size_read(file_inode(file)) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	    ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (N_FLAGS(ex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	/* For  QMAGIC, the starting address is 0x20 into the page.  We mask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	   this off to get the starting address for the page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	start_addr =  ex.a_entry & 0xfffff000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) #ifdef WARN_OLD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		static unsigned long error_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		if (time_after(jiffies, error_time + 5*HZ)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			printk(KERN_WARNING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			       "N_TXTOFF is not page aligned. Please convert "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			       "library: %pD\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			       file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			error_time = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		read_code(file, start_addr, N_TXTOFF(ex),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			  ex.a_text + ex.a_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	/* Now use mmap to map the library into memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			PROT_READ | PROT_WRITE | PROT_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			N_TXTOFF(ex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	retval = error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (error != start_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	len = PAGE_ALIGN(ex.a_text + ex.a_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	bss = ex.a_text + ex.a_data + ex.a_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (bss > len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		retval = vm_brk(start_addr + len, bss - len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static int __init init_aout_binfmt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	register_binfmt(&aout_format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static void __exit exit_aout_binfmt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	unregister_binfmt(&aout_format);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) module_init(init_aout_binfmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) module_exit(exit_aout_binfmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) MODULE_LICENSE("GPL");