diff options
| author | Will Deacon <will.deacon@arm.com> | 2019-01-03 21:00:39 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-01-04 17:18:01 +0300 |
| commit | 53290432145a8eb143fe29e06e9c1465d43dc723 (patch) | |
| tree | 1312ac6856bc9d350194a75b1e6a4f219f8c98b0 /arch/arm64/kernel/sys_compat.c | |
| parent | 169113ece0f29ebe884a6cfcf57c1ace04d8a36a (diff) | |
| download | linux-53290432145a8eb143fe29e06e9c1465d43dc723.tar.xz | |
arm64: compat: Don't pull syscall number from regs in arm_compat_syscall
The syscall number may have been changed by a tracer, so we should pass
the actual number in from the caller instead of pulling it from the
saved r7 value directly.
Cc: <stable@vger.kernel.org>
Cc: Pi-Hsun Shih <pihsun@chromium.org>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/sys_compat.c')
| -rw-r--r-- | arch/arm64/kernel/sys_compat.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c index a79db4e485a6..bc348ab3dd6b 100644 --- a/arch/arm64/kernel/sys_compat.c +++ b/arch/arm64/kernel/sys_compat.c @@ -66,12 +66,11 @@ do_compat_cache_op(unsigned long start, unsigned long end, int flags) /* * Handle all unrecognised system calls. */ -long compat_arm_syscall(struct pt_regs *regs) +long compat_arm_syscall(struct pt_regs *regs, int scno) { - unsigned int no = regs->regs[7]; void __user *addr; - switch (no) { + switch (scno) { /* * Flush a region from virtual address 'r0' to virtual address 'r1' * _exclusive_. There is no alignment requirement on either address; @@ -107,7 +106,7 @@ long compat_arm_syscall(struct pt_regs *regs) * way the calling program can gracefully determine whether * a feature is supported. */ - if (no < __ARM_NR_COMPAT_END) + if (scno < __ARM_NR_COMPAT_END) return -ENOSYS; break; } @@ -116,6 +115,6 @@ long compat_arm_syscall(struct pt_regs *regs) (compat_thumb_mode(regs) ? 2 : 4); arm64_notify_die("Oops - bad compat syscall(2)", regs, - SIGILL, ILL_ILLTRP, addr, no); + SIGILL, ILL_ILLTRP, addr, scno); return 0; } |