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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
This commit is contained in:
Kees Cook 2016-06-02 12:16:31 -07:00
parent 93e35efb8d
commit 0f3912fd93
1 changed files with 6 additions and 5 deletions
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11
arch/arm/kernel/ptrace.c
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@ -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))