linux-kernel - Re: [PATCH 6/6] x86: signal: sys_rt_sigreturn() should use sigprocmask()

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Date:	Tue, 12 Apr 2011 13:17:57 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] x86: signal: sys_rt_sigreturn() should use
 sigprocmask()

On Mon, 11 Apr 2011 19:22:29 +0200
Oleg Nesterov <oleg@...hat.com> wrote:

> 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 sigprocmask()->retarget_shared_pending().
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Reviewed-by: Matt Fleming <matt.fleming@...ux.intel.com>

I'm just curious, have you actually seen this bug?
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