linux-kernel - Re: [PATCH -mm 3/3] proc: make task

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Message-ID: <9905.1270887379@redhat.com>
Date:	Sat, 10 Apr 2010 09:16:19 +0100
From:	David Howells <dhowells@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	dhowells@...hat.com, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 3/3] proc: make task_sig() lockless

Roland McGrath <roland@...hat.com> wrote:

> I'm not so sure.  Operations like sigprocmask and sigaction really have
> always been entirely atomic from the userland perspective before.  Now it
> becomes possible to read from /proc e.g. a blocked set that never existed
> as such (one word updated by sigprocmask but not yet the next word).

If you have a small userspace buffer, that was previously possible too.

David
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