linux-kernel - Re: [PATCH 1/2] do_execve() must not clear fs->in

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Message-ID: <20090423233157.GA22981@ZenIV.linux.org.uk>
Date:	Fri, 24 Apr 2009 00:31:57 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Hugh Dickins <hugh@...itas.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Malicki <jmalicki@...acarta.com>,
	Michael Itz <mitz@...acarta.com>,
	Kenneth Baker <bakerk@...acarta.com>,
	Chris Wright <chrisw@...s-sol.org>,
	David Howells <dhowells@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH 1/2] do_execve() must not clear fs->in_exec if it was
	set by another thread

On Fri, Apr 24, 2009 at 01:01:56AM +0200, Oleg Nesterov wrote:
> If do_execve() fails after check_unsafe_exec(), it clears fs->in_exec
> unconditionally. This is wrong if we race with our sub-thread which
> also does do_execve:


[snip]

Applied (both of those).
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