Re: Q: SEGSEGV && uc_mcontext->ip (Was: Signal delivery order)

[Oleg Nesterov <oleg@redhat.com>]

Sorry for noise, forgot to mention,

On 03/17, Oleg Nesterov wrote:
>
> 	--- arch/x86/mm/fault.c
> 	+++ arch/x86/mm/fault.c
> 	@@ -177,6 +177,13 @@ static void force_sig_info_fault(int si_
> 	 {
> 		siginfo_t info;
> 	 
> 	+	current->saved_sigmask = current->blocked;
> 	+	spin_lock_irq(&current->sighand->siglock);
> 	+	siginitsetinv(&current->blocked, sigmask(si_signo) |
> 	+			sigmask(SIGKILL) | sigmask(SIGSTOP));
> 	+	spin_unlock_irq(&current->sighand->siglock);
> 	+	set_restore_sigmask();
> 	+

Of course, this change is wrong, it is just for illustration.
We shouldn't unblock si_signo if it was blocked, force_sig_info()
sets SIG_DFL in this case.

Oleg.