diff options
| author | Kees Cook <keescook@chromium.org> | 2016-06-02 12:16:31 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2016-06-14 10:54:42 -0700 |
| commit | 0f3912fd934cdfd03d93f2dc6f064099795bf638 (patch) | |
| tree | 9258e91c5fe29557a9f37d918d9c7ca02a86e525 /arch | |
| parent | 93e35efb8de45393cf61ed07f7b407629bf698ea (diff) | |
| download | linux-0f3912fd934cdfd03d93f2dc6f064099795bf638.tar.gz linux-0f3912fd934cdfd03d93f2dc6f064099795bf638.tar.bz2 linux-0f3912fd934cdfd03d93f2dc6f064099795bf638.zip | |
arm/ptrace: run seccomp after ptrace
Close the hole where ptrace can change a syscall out from under seccomp.
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/ptrace.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index 1027d3b54541..ce131ed5939d 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -932,18 +932,19 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno) { current_thread_info()->syscall = scno; - /* Do the secure computing check first; failures should be fast. */ + if (test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER); + + /* Do seccomp after ptrace; syscall may have changed. */ #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER if (secure_computing(NULL) == -1) return -1; #else /* XXX: remove this once OABI gets fixed */ - secure_computing_strict(scno); + secure_computing_strict(current_thread_info()->syscall); #endif - if (test_thread_flag(TIF_SYSCALL_TRACE)) - tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER); - + /* Tracer or seccomp may have changed syscall. */ scno = current_thread_info()->syscall; if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |