linux-kernel - Re: [PATCH v2 7/7] x86: signal: sys_rt_sigreturn() should use set_current

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Message-ID: <20110423181231.GA1472@redhat.com>
Date:	Sat, 23 Apr 2011 20:12:31 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/7] x86: signal: sys_rt_sigreturn() should use
	set_current_blocked()

On 04/22, Matt Fleming wrote:
>
> On Mon, 18 Apr 2011 15:46:41 +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 set_current_blocked()->retarget_shared_pending().
> >
> > Signed-off-by: Oleg Nesterov <oleg@...hat.com>
>
> Reviewed-by: Matt Fleming <matt.fleming@...ux.intel.com>

Thanks Matt.

> But does sys_sigreturn() also need this change?

Of course, it needs. From 0/7:

	Once again: if we need this, then we need a lot more (trivial) changes
	like 6/7 and 7/7. Basically every change of ->blocked should be converted
	to use set_current_blocked().

6 and 7 are simple examples, most of the other changes will look similary.

Except sys_rt_sigtimedwait(), it changes both ->real_blocked and blocked,
see the patches I sent. sys_sigprocmask() is a bit annoying, but the
necessary changes are simple.

Oleg.

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