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x86/arch_prctl: Simplify sys_arch_prctl()

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Use in_ia32_syscall() instead of a compat syscall entry.

No change in functionality intended.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20250202202323.422113-2-brgerst@gmail.com
This commit is contained in:
Brian Gerst 2025-02-02 15:23:22 -05:00 • committed by Ingo Molnar
parent 06dd759b68
commit 2df1ad0d25
5 changed files with 6 additions and 27 deletions
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2
arch/x86/entry/syscalls/syscall_32.tbl
View file

@ -396,7 +396,7 @@
381 i386 pkey_alloc sys_pkey_alloc 381 i386 pkey_alloc sys_pkey_alloc
382 i386 pkey_free sys_pkey_free 382 i386 pkey_free sys_pkey_free
383 i386 statx sys_statx 383 i386 statx sys_statx
384 i386 arch_prctl sys_arch_prctl compat_sys_arch_prctl 384 i386 arch_prctl sys_arch_prctl
385 i386 io_pgetevents sys_io_pgetevents_time32 compat_sys_io_pgetevents 385 i386 io_pgetevents sys_io_pgetevents_time32 compat_sys_io_pgetevents
386 i386 rseq sys_rseq 386 i386 rseq sys_rseq
393 i386 semget sys_semget 393 i386 semget sys_semget

3
arch/x86/include/asm/proto.h
View file

@ -15,7 +15,6 @@ void entry_SYSCALL_64(void);
void entry_SYSCALL_64_safe_stack(void); void entry_SYSCALL_64_safe_stack(void);
void entry_SYSRETQ_unsafe_stack(void); void entry_SYSRETQ_unsafe_stack(void);
void entry_SYSRETQ_end(void); void entry_SYSRETQ_end(void);
long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2);
#endif #endif
#ifdef CONFIG_X86_32 #ifdef CONFIG_X86_32
@ -41,6 +40,6 @@ void x86_configure_nx(void);
extern int reboot_force; extern int reboot_force;
long do_arch_prctl_common(int option, unsigned long arg2); long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2);
#endif /* _ASM_X86_PROTO_H */ #endif /* _ASM_X86_PROTO_H */

5
arch/x86/kernel/process.c
View file

@ -1043,7 +1043,7 @@ unsigned long __get_wchan(struct task_struct *p)
return addr; return addr;
} }
long do_arch_prctl_common(int option, unsigned long arg2) SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
{ {
switch (option) { switch (option) {
case ARCH_GET_CPUID: case ARCH_GET_CPUID:
@ -1058,5 +1058,8 @@ long do_arch_prctl_common(int option, unsigned long arg2)
return fpu_xstate_prctl(option, arg2); return fpu_xstate_prctl(option, arg2);
} }
if (!in_ia32_syscall())
return do_arch_prctl_64(current, option, arg2);
return -EINVAL; return -EINVAL;
} }

5
arch/x86/kernel/process_32.c
View file

@ -215,8 +215,3 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
return prev_p; return prev_p;
} }
SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
{
return do_arch_prctl_common(option, arg2);
}

18
arch/x86/kernel/process_64.c
View file

@ -980,24 +980,6 @@ long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2)
return ret; return ret;
} }
SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
{
long ret;
ret = do_arch_prctl_64(current, option, arg2);
if (ret == -EINVAL)
ret = do_arch_prctl_common(option, arg2);
return ret;
}
#ifdef CONFIG_IA32_EMULATION
COMPAT_SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
{
return do_arch_prctl_common(option, arg2);
}
#endif
unsigned long KSTK_ESP(struct task_struct *task) unsigned long KSTK_ESP(struct task_struct *task)
{ {
return task_pt_regs(task)->sp; return task_pt_regs(task)->sp;