linux-kernel - Re: audit_tree: sleep inside atomic

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Message-ID: <20101030062147.GA16697@ZenIV.linux.org.uk>
Date:	Sat, 30 Oct 2010 07:21:47 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Eric Paris <eparis@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jirislaby@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: audit_tree: sleep inside atomic

On Wed, Sep 15, 2010 at 04:08:25PM -0400, Eric Paris wrote:
> On Mon, 2010-09-13 at 17:05 -0700, Andrew Morton wrote:
> > On Fri, 03 Sep 2010 15:52:30 +0200
> > Jiri Slaby <jirislaby@...il.com> wrote:
> > 
> > > Ideas, comments?
> > 
> > Apparently not.
> 
> Sorry, I've been slacking off on vacation the last couple weeks.
> 
> > The question is: why is nobody reporting this bug?  Obviously nobody's
> > running that code path.  Why not?
> 
> The only people who run this code path, that I know of, are govt orgs
> who run in certified environments.  I don't know of any upstream kernel
> users who really would hit it.
> 
> In any case I don't think it would be particularly painful to just
> always allocate a chunk between the two locks.  this is not a hot path
> by any stretch of the imagination.  I'll see if I can't code something
> up today/tomorrow.

It's not even a matter of path being hot; we should do allocation before
grabbing entry->lock if size is non-zero.  End of the story.

Fixed in audit branch I'll push today.
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