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Two changes to simplify the x86 vDSO code a bit.

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-entry-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 vdso updates from Ingo Molnar:
 "Two changes to simplify the x86 vDSO code a bit"

* tag 'x86-entry-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/vdso: Remove redundant #ifdeffery around in_ia32_syscall()
  x86/vdso: Remove #ifdeffery around page setup variants
This commit is contained in:
Linus Torvalds 2025-05-26 21:21:12 -07:00
commit 24244df067
3 changed files with 12 additions and 35 deletions
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35
arch/x86/entry/vdso/vma.c
View File

@ -65,7 +65,6 @@ static vm_fault_t vdso_fault(const struct vm_special_mapping *sm,
static void vdso_fix_landing(const struct vdso_image *image,
struct vm_area_struct *new_vma)
{
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
if (in_ia32_syscall() && image == &vdso_image_32) {
struct pt_regs *regs = current_pt_regs();
unsigned long vdso_land = image->sym_int80_landing_pad;
@ -76,7 +75,6 @@ static void vdso_fix_landing(const struct vdso_image *image,
if (regs->ip == old_land_addr)
regs->ip = new_vma->vm_start + vdso_land;
}
#endif
}
static int vdso_mremap(const struct vm_special_mapping *sm,
@ -227,7 +225,6 @@ int map_vdso_once(const struct vdso_image *image, unsigned long addr)
return map_vdso(image, addr);
}
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
static int load_vdso32(void)
{
if (vdso32_enabled != 1) /* Other values all mean "disabled" */
@ -235,45 +232,38 @@ static int load_vdso32(void)
return map_vdso(&vdso_image_32, 0);
}
#endif
#ifdef CONFIG_X86_64
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
{
if (!vdso64_enabled)
return 0;
if (IS_ENABLED(CONFIG_X86_64)) {
if (!vdso64_enabled)
return 0;
return map_vdso(&vdso_image_64, 0);
return map_vdso(&vdso_image_64, 0);
}
return load_vdso32();
}
#ifdef CONFIG_COMPAT
int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp, bool x32)
{
#ifdef CONFIG_X86_X32_ABI
if (x32) {
if (IS_ENABLED(CONFIG_X86_X32_ABI) && x32) {
if (!vdso64_enabled)
return 0;
return map_vdso(&vdso_image_x32, 0);
}
#endif
#ifdef CONFIG_IA32_EMULATION
return load_vdso32();
#else
if (IS_ENABLED(CONFIG_IA32_EMULATION))
return load_vdso32();
return 0;
#endif
}
#endif
#else
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
{
return load_vdso32();
}
#endif
bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
{
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
const struct vdso_image *image = current->mm->context.vdso_image;
unsigned long vdso = (unsigned long) current->mm->context.vdso;
@ -282,7 +272,6 @@ bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
regs->ip == vdso + image->sym_vdso32_rt_sigreturn_landing_pad)
return true;
}
#endif
return false;
}

4
arch/x86/include/asm/elf.h
View File

@ -76,12 +76,8 @@ typedef struct user_i387_struct elf_fpregset_t;
#include <asm/vdso.h>
#ifdef CONFIG_X86_64
extern unsigned int vdso64_enabled;
#endif
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
extern unsigned int vdso32_enabled;
#endif
/*
* This is used to ensure we don't load something for the wrong architecture.

8
arch/x86/include/asm/vdso.h
View File

@ -27,17 +27,9 @@ struct vdso_image {
long sym_vdso32_rt_sigreturn_landing_pad;
};
#ifdef CONFIG_X86_64
extern const struct vdso_image vdso_image_64;
#endif
#ifdef CONFIG_X86_X32_ABI
extern const struct vdso_image vdso_image_x32;
#endif
#if defined CONFIG_X86_32 || defined CONFIG_COMPAT
extern const struct vdso_image vdso_image_32;
#endif
extern int __init init_vdso_image(const struct vdso_image *image);