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)  * Copyright 2007 Andi Kleen, SUSE Labs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * This contains most of the x86 vDSO kernel-side code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/time_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/pvclock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/vgtod.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/proto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/vdso.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/vvar.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <asm/desc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/cpufeature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <clocksource/hyperv_timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #undef _ASM_X86_VVAR_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define EMIT_VVAR(name, offset)	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	const size_t name ## _offset = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <asm/vvar.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) struct vdso_data *arch_get_vdso_data(void *vvar_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return (struct vdso_data *)(vvar_page + _vdso_data_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #undef EMIT_VVAR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) unsigned int vclocks_used __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #if defined(CONFIG_X86_64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) unsigned int __read_mostly vdso64_enabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) void __init init_vdso_image(const struct vdso_image *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	BUG_ON(image->size % PAGE_SIZE != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	apply_alternatives((struct alt_instr *)(image->data + image->alt),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			   (struct alt_instr *)(image->data + image->alt +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 						image->alt_len));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static const struct vm_special_mapping vvar_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) struct linux_binprm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static vm_fault_t vdso_fault(const struct vm_special_mapping *sm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		      struct vm_area_struct *vma, struct vm_fault *vmf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	const struct vdso_image *image = vma->vm_mm->context.vdso_image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (!image || (vmf->pgoff << PAGE_SHIFT) >= image->size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	vmf->page = virt_to_page(image->data + (vmf->pgoff << PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	get_page(vmf->page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static void vdso_fix_landing(const struct vdso_image *image,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		struct vm_area_struct *new_vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (in_ia32_syscall() && image == &vdso_image_32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		unsigned long vdso_land = image->sym_int80_landing_pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		unsigned long old_land_addr = vdso_land +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			(unsigned long)current->mm->context.vdso;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		/* Fixing userspace landing - look at do_fast_syscall_32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		if (regs->ip == old_land_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			regs->ip = new_vma->vm_start + vdso_land;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static int vdso_mremap(const struct vm_special_mapping *sm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		struct vm_area_struct *new_vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	unsigned long new_size = new_vma->vm_end - new_vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	const struct vdso_image *image = current->mm->context.vdso_image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (image->size != new_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	vdso_fix_landing(image, new_vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	current->mm->context.vdso = (void __user *)new_vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static int vvar_mremap(const struct vm_special_mapping *sm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		struct vm_area_struct *new_vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	const struct vdso_image *image = new_vma->vm_mm->context.vdso_image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	unsigned long new_size = new_vma->vm_end - new_vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (new_size != -image->sym_vvar_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #ifdef CONFIG_TIME_NS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (likely(vma->vm_mm == current->mm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		return current->nsproxy->time_ns->vvar_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	 * VM_PFNMAP | VM_IO protect .fault() handler from being called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	 * through interfaces like /proc/$pid/mem or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	 * process_vm_{readv,writev}() as long as there's no .access()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	 * in special_mapping_vmops().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	 * For more details check_vma_flags() and __access_remote_vm()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	WARN(1, "vvar_page accessed remotely");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * The vvar page layout depends on whether a task belongs to the root or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  * non-root time namespace. Whenever a task changes its namespace, the VVAR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * page tables are cleared and then they will re-faulted with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * corresponding layout.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * See also the comment near timens_setup_vdso_data() for details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	struct mm_struct *mm = task->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	mmap_read_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	for (vma = mm->mmap; vma; vma = vma->vm_next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		unsigned long size = vma->vm_end - vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		if (vma_is_special_mapping(vma, &vvar_mapping))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			zap_page_range(vma, vma->vm_start, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		      struct vm_area_struct *vma, struct vm_fault *vmf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	const struct vdso_image *image = vma->vm_mm->context.vdso_image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	long sym_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (!image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	sym_offset = (long)(vmf->pgoff << PAGE_SHIFT) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		image->sym_vvar_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	 * Sanity check: a symbol offset of zero means that the page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	 * does not exist for this vdso image, not that the page is at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	 * offset zero relative to the text mapping.  This should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	 * impossible here, because sym_offset should only be zero for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	 * the page past the end of the vvar mapping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (sym_offset == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (sym_offset == image->sym_vvar_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		struct page *timens_page = find_timens_vvar_page(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		pfn = __pa_symbol(&__vvar_page) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		 * If a task belongs to a time namespace then a namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		 * specific VVAR is mapped with the sym_vvar_page offset and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		 * the real VVAR page is mapped with the sym_timens_page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		 * offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		 * See also the comment near timens_setup_vdso_data().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		if (timens_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			vm_fault_t err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			 * Optimization: inside time namespace pre-fault
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			 * VVAR page too. As on timens page there are only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			 * offsets for clocks on VVAR, it'll be faulted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			 * shortly by VDSO code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			addr = vmf->address + (image->sym_timens_page - sym_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			err = vmf_insert_pfn(vma, addr, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 			if (unlikely(err & VM_FAULT_ERROR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 				return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			pfn = page_to_pfn(timens_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		return vmf_insert_pfn(vma, vmf->address, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	} else if (sym_offset == image->sym_pvclock_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		struct pvclock_vsyscall_time_info *pvti =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			pvclock_get_pvti_cpu0_va();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		if (pvti && vclock_was_used(VDSO_CLOCKMODE_PVCLOCK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			return vmf_insert_pfn_prot(vma, vmf->address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 					__pa(pvti) >> PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 					pgprot_decrypted(vma->vm_page_prot));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	} else if (sym_offset == image->sym_hvclock_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		struct ms_hyperv_tsc_page *tsc_pg = hv_get_tsc_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		if (tsc_pg && vclock_was_used(VDSO_CLOCKMODE_HVCLOCK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			return vmf_insert_pfn(vma, vmf->address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 					virt_to_phys(tsc_pg) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	} else if (sym_offset == image->sym_timens_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		struct page *timens_page = find_timens_vvar_page(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		if (!timens_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		pfn = __pa_symbol(&__vvar_page) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		return vmf_insert_pfn(vma, vmf->address, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static const struct vm_special_mapping vdso_mapping = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.name = "[vdso]",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	.fault = vdso_fault,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	.mremap = vdso_mremap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) static const struct vm_special_mapping vvar_mapping = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	.name = "[vvar]",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	.fault = vvar_fault,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	.mremap = vvar_mremap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)  * Add vdso and vvar mappings to current process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)  * @image          - blob to map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)  * @addr           - request a specific address (zero to map at free addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static int map_vdso(const struct vdso_image *image, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	struct mm_struct *mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	unsigned long text_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (mmap_write_lock_killable(mm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	addr = get_unmapped_area(NULL, addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 				 image->size - image->sym_vvar_start, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (IS_ERR_VALUE(addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		ret = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		goto up_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	text_start = addr - image->sym_vvar_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	 * MAYWRITE to allow gdb to COW and set breakpoints
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	vma = _install_special_mapping(mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 				       text_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 				       image->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 				       VM_READ|VM_EXEC|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 				       VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 				       &vdso_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (IS_ERR(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		ret = PTR_ERR(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		goto up_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	vma = _install_special_mapping(mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 				       addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 				       -image->sym_vvar_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 				       VM_READ|VM_MAYREAD|VM_IO|VM_DONTDUMP|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 				       VM_PFNMAP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 				       &vvar_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (IS_ERR(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		ret = PTR_ERR(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		do_munmap(mm, text_start, image->size, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		current->mm->context.vdso = (void __user *)text_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		current->mm->context.vdso_image = image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) up_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	mmap_write_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)  * Put the vdso above the (randomized) stack with another randomized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)  * offset.  This way there is no hole in the middle of address space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)  * To save memory make sure it is still in the same PTE as the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)  * top.  This doesn't give that many random bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)  * Note that this algorithm is imperfect: the distribution of the vdso
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)  * start address within a PMD is biased toward the end.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  * Only used for the 64-bit and x32 vdsos.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) static unsigned long vdso_addr(unsigned long start, unsigned len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	unsigned long addr, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	unsigned offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	 * Round up the start address.  It can start out unaligned as a result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	 * of stack start randomization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	start = PAGE_ALIGN(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	/* Round the lowest possible end address up to a PMD boundary. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	end = (start + len + PMD_SIZE - 1) & PMD_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	if (end >= TASK_SIZE_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		end = TASK_SIZE_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	end -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (end > start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		addr = start + (offset << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	 * Forcibly align the final address in case we have a hardware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	 * issue that requires alignment for performance reasons.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	addr = align_vdso_addr(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static int map_vdso_randomized(const struct vdso_image *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	unsigned long addr = vdso_addr(current->mm->start_stack, image->size-image->sym_vvar_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	return map_vdso(image, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) int map_vdso_once(const struct vdso_image *image, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	struct mm_struct *mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	mmap_write_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	 * Check if we have already mapped vdso blob - fail to prevent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	 * abusing from userspace install_speciall_mapping, which may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	 * not do accounting and rlimit right.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	 * We could search vma near context.vdso, but it's a slowpath,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	 * so let's explicitly check all VMAs to be completely sure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	for (vma = mm->mmap; vma; vma = vma->vm_next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		if (vma_is_special_mapping(vma, &vdso_mapping) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 				vma_is_special_mapping(vma, &vvar_mapping)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			mmap_write_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 			return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	mmap_write_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	return map_vdso(image, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) static int load_vdso32(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	if (vdso32_enabled != 1)  /* Other values all mean "disabled" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	return map_vdso(&vdso_image_32, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	if (!vdso64_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	return map_vdso_randomized(&vdso_image_64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 				       int uses_interp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) #ifdef CONFIG_X86_X32_ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	if (test_thread_flag(TIF_X32)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		if (!vdso64_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		return map_vdso_randomized(&vdso_image_x32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) #ifdef CONFIG_IA32_EMULATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	return load_vdso32();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	return load_vdso32();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) static __init int vdso_setup(char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	vdso64_enabled = simple_strtoul(s, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) __setup("vdso=", vdso_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) static int __init init_vdso(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 	BUILD_BUG_ON(VDSO_CLOCKMODE_MAX >= 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 	init_vdso_image(&vdso_image_64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) #ifdef CONFIG_X86_X32_ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	init_vdso_image(&vdso_image_x32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) subsys_initcall(init_vdso);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) #endif /* CONFIG_X86_64 */