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arm64: fix function types in COND_SYSCALL

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Define a weak function in COND_SYSCALL instead of a weak alias to
sys_ni_syscall, which has an incompatible type. This fixes indirect
call mismatches with Control-Flow Integrity (CFI) checking.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Sami Tolvanen 2019-09-10 15:40:44 -07:00 committed by Will Deacon
parent bd3841cd3b
commit c27eccfe4d
1 changed files with 12 additions and 3 deletions
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15
arch/arm64/include/asm/syscall_wrapper.h
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@ -8,6 +8,8 @@
#ifndef __ASM_SYSCALL_WRAPPER_H
#define __ASM_SYSCALL_WRAPPER_H
struct pt_regs;
#define SC_ARM64_REGS_TO_ARGS(x, ...) \
__MAP(x,__SC_ARGS \
,,regs->regs[0],,regs->regs[1],,regs->regs[2] \
@ -35,8 +37,11 @@
ALLOW_ERROR_INJECTION(__arm64_compat_sys_##sname, ERRNO); \
asmlinkage long __arm64_compat_sys_##sname(const struct pt_regs *__unused)
#define COND_SYSCALL_COMPAT(name) \
cond_syscall(__arm64_compat_sys_##name);
#define COND_SYSCALL_COMPAT(name) \
asmlinkage long __weak __arm64_compat_sys_##name(const struct pt_regs *regs) \
{ \
return sys_ni_syscall(); \
}
#define COMPAT_SYS_NI(name) \
SYSCALL_ALIAS(__arm64_compat_sys_##name, sys_ni_posix_timers);
@ -70,7 +75,11 @@
#endif
#ifndef COND_SYSCALL
#define COND_SYSCALL(name) cond_syscall(__arm64_sys_##name)
#define COND_SYSCALL(name) \
asmlinkage long __weak __arm64_sys_##name(const struct pt_regs *regs) \
{ \
return sys_ni_syscall(); \
}
#endif
#ifndef SYS_NI