From: Will Drewry <w...@chromium.org>
On tracehook-friendly platforms, a system call number of -1 falls
through without running much code or taking much action.
ARM is different. This adds a lightweight check to arm_syscall()
to make sure that ARM behaves the same way.
Signed-off-by: Will Drewry <w...@chromium.org>
Signed-off-by: Kees Cook <keesc...@chromium.org>
---
arch/arm/kernel/traps.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index b0179b8..f303ea6 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -540,6 +540,10 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
struct thread_info *thread = current_thread_info();
siginfo_t info;
+ /* Emulate/fallthrough. */
+ if (no == -1)
+ return regs->ARM_r0;
+
if ((no >> 16) != (__ARM_NR_BASE>> 16))
return bad_syscall(no, regs);
--
1.7.9.5
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