[PATCH v2 7/7] x86: signal: sys_rt_sigreturn() should useset_current_blocked()

From: Oleg Nesterov
Date: Mon Apr 18 2011 - 09:48:11 EST


Normally sys_rt_sigreturn() restores the old current->blocked which was
changed by handle_signal(), and unblocking is always fine.

But the debugger or application itself can change frame->uc_sigmask and
thus we need set_current_blocked()->retarget_shared_pending().

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---

arch/x86/kernel/signal.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

--- sigprocmask/arch/x86/kernel/signal.c~7_sigreturn 2011-04-17 23:07:14.000000000 +0200
+++ sigprocmask/arch/x86/kernel/signal.c 2011-04-17 23:19:13.000000000 +0200
@@ -601,10 +601,7 @@ long sys_rt_sigreturn(struct pt_regs *re
goto badframe;

sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
+ set_current_blocked(&set);

if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;

--
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