[PATCH 0/1] ptrace: x86: stepping in a signal handler leaks X86_EFLAGS_TF

[Oleg Nesterov <oleg@redhat.com>]

On 06/02, Oleg Nesterov wrote:
>
> I am starting to think we should fix this per arch. As for x86, perhaps
> we should start with this one-liner
>
> 		spin_unlock_irq(&current->sighand->siglock);
>
> 		tracehook_signal_handler(sig, info, ka, regs,
> 	-				 test_thread_flag(TIF_SINGLESTEP));
> 	+				 test_and_clear_thread_flag(TIF_SINGLESTEP));
>
> 		return 0;
> 	 }
>
> then do other changes.

I am sending this patch. It is still not clear to me what is the
"right" fix, we need more discussion. Let's fix the bug first.

Oleg.