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arm64: use the correct function type for __arm64_sys_ni_syscall 

Calling sys_ni_syscall through a syscall_fn_t pointer trips indirect
call Control-Flow Integrity checking due to a function type
mismatch. Use SYSCALL_DEFINE0 for __arm64_sys_ni_syscall instead and
remove the now unnecessary casts.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.2
Sami Tolvanen 2019-05-24 15:11:18 -07:00 committed by Will Deacon
parent 0e358bd7b7
commit 1e29ab3186
2 changed files with 11 additions and 10 deletions
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14
arch/arm64/kernel/sys.c
View File

@ -47,22 +47,26 @@ SYSCALL_DEFINE1(arm64_personality, unsigned int, personality)
return ksys_personality(personality);
}
asmlinkage long sys_ni_syscall(void);
asmlinkage long __arm64_sys_ni_syscall(const struct pt_regs *__unused)
{
return sys_ni_syscall();
}
/*
* Wrappers to pass the pt_regs argument.
*/
#define __arm64_sys_personality __arm64_sys_arm64_personality
asmlinkage long sys_ni_syscall(const struct pt_regs *);
#define __arm64_sys_ni_syscall sys_ni_syscall
#undef __SYSCALL
#define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *);
#include <asm/unistd.h>
#undef __SYSCALL
#define __SYSCALL(nr, sym) [nr] = (syscall_fn_t)__arm64_##sym,
#define __SYSCALL(nr, sym) [nr] = __arm64_##sym,
const syscall_fn_t sys_call_table[__NR_syscalls] = {
[0 ... __NR_syscalls - 1] = (syscall_fn_t)sys_ni_syscall,
[0 ... __NR_syscalls - 1] = __arm64_sys_ni_syscall,
#include <asm/unistd.h>
};

7
arch/arm64/kernel/sys32.c
View File

@ -133,17 +133,14 @@ COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode,
return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len));
}
asmlinkage long sys_ni_syscall(const struct pt_regs *);
#define __arm64_sys_ni_syscall sys_ni_syscall
#undef __SYSCALL
#define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *);
#include <asm/unistd32.h>
#undef __SYSCALL
#define __SYSCALL(nr, sym) [nr] = (syscall_fn_t)__arm64_##sym,
#define __SYSCALL(nr, sym) [nr] = __arm64_##sym,
const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = {
[0 ... __NR_compat_syscalls - 1] = (syscall_fn_t)sys_ni_syscall,
[0 ... __NR_compat_syscalls - 1] = __arm64_sys_ni_syscall,
#include <asm/unistd32.h>
};