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syscalls/x86: Use the correct function type in SYSCALL_DEFINE0

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Although a syscall defined using SYSCALL_DEFINE0 doesn't accept
parameters, use the correct function type to avoid type mismatches
with Control-Flow Integrity (CFI) checking.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H . Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191008224049.115427-2-samitolvanen@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sami Tolvanen 2019-10-08 15:40:45 -07:00 committed by Ingo Molnar
parent 8a8c600de5
commit 8661d769ab
1 changed files with 12 additions and 11 deletions
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23
arch/x86/include/asm/syscall_wrapper.h
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@ -48,12 +48,13 @@
* To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias
* named __ia32_sys_*()
*/
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
asmlinkage long __x64_sys_##sname(void); \
ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \
SYSCALL_ALIAS(__ia32_sys_##sname, __x64_sys_##sname); \
asmlinkage long __x64_sys_##sname(void)
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused);\
ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \
SYSCALL_ALIAS(__ia32_sys_##sname, __x64_sys_##sname); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused)
#define COND_SYSCALL(name) \
cond_syscall(__x64_sys_##name); \
@ -181,11 +182,11 @@
* macros to work correctly.
*/
#ifndef SYSCALL_DEFINE0
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
asmlinkage long __x64_sys_##sname(void); \
ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \
asmlinkage long __x64_sys_##sname(void)
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused);\
ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \
asmlinkage long __x64_sys_##sname(const struct pt_regs *__unused)
#endif
#ifndef COND_SYSCALL