[PATCH] ppc64: fix seccomp with 32-bit userland

The seccomp check has to happen when entering the syscall and not when
exiting it or regs->gpr[0] contains garabge during signal handling in
ppc64_rt_sigreturn (this actually might be a bug too, but an orthogonal
one, since we really have to run the check before invoking the syscall and
not after it).

Signed-off-by: Andrea Arcangeli <andrea@cpushare.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/ppc64/kernel/ptrace.c b/arch/ppc64/kernel/ptrace.c
index 9f8c6087ae56..2993f108d96d 100644
--- a/arch/ppc64/kernel/ptrace.c
+++ b/arch/ppc64/kernel/ptrace.c
@@ -305,6 +305,8 @@ static void do_syscall_trace(void)
 
 void do_syscall_trace_enter(struct pt_regs *regs)
 {
+        secure_computing(regs->gpr[0]);
+
         if (test_thread_flag(TIF_SYSCALL_TRACE)
             && (current->ptrace & PT_PTRACED))
                 do_syscall_trace();
@@ -320,8 +322,6 @@ void do_syscall_trace_enter(struct pt_regs *regs)
 
 void do_syscall_trace_leave(struct pt_regs *regs)
 {
-        secure_computing(regs->gpr[0]);
-
         if (unlikely(current->audit_context))
                 audit_syscall_exit(current, 
                                    (regs->ccr&0x1000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,