Close the hole where ptrace can change a syscall out from under seccomp.
Signed-off-by: Kees Cook <keesc...@chromium.org>
Cc: Ralf Baechle <r...@linux-mips.org>
Cc: "Maciej W. Rozycki" <ma...@imgtec.com>
Cc: James Hogan <james.ho...@imgtec.com>
Cc: linux-m...@linux-mips.org
---
arch/mips/kernel/ptrace.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index c50af846ecf9..6103b24d1bfc 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -888,17 +888,16 @@ long arch_ptrace(struct task_struct *child, long request,
*/
asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
{
- long ret = 0;
user_exit();
current_thread_info()->syscall = syscall;
- if (secure_computing(NULL) == -1)
- return -1;
-
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
tracehook_report_syscall_entry(regs))
- ret = -1;
+ return -1;
+
+ if (secure_computing(NULL) == -1)
+ return -1;
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_enter(regs, regs->regs[2]);
--
2.7.4
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