linux-kernel - Re: [RFC PATCH v2 0/7] signal: sigprocmask fixes

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Message-ID: <BANLkTimO2FL3548rxa9NEoVLFbZU7mzG7g@mail.gmail.com>
Date:	Mon, 18 Apr 2011 10:16:43 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 0/7] signal: sigprocmask fixes

On Mon, Apr 18, 2011 at 6:44 AM, Oleg Nesterov <oleg@...hat.com> wrote:
>
> 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(). OTOH, perhaps this makes sense by itself.

Hmm. The more I think about this, the less I like it.

What if the pending thread signal was thread-specific to begin with?

For example, if we have a SIGFPE and a SIGKILL that happen at the same
time, a dying task may have a SIGFPE pending when it dies, and that
SIGFPE should _not_ be just distributed out to the other threads in
the thread group.

Am I missing something that protects against this?

                  Linus
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