linux-kernel - Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc

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Date:	Wed, 24 Mar 2010 11:37:21 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Amit Shah <amit.shah@...hat.com>,
	linuxppc-dev@...abs.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and
 hvc_remove

On Sun, 21 Mar 2010 08:04:39 +1100
Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Fri, 2010-03-19 at 08:18 -0700, Greg Kroah-Hartman wrote:
> > From: Amit Shah <amit.shah@...hat.com>
> > 
> > Alan pointed out a race in the code where hvc_remove is invoked. The
> > recent virtio_console work is the first user of hvc_remove().
> 
> This causes hangs during boot on pseries machines. Haven't had a chance
> to track that down yet, but please revert
> e74d098c66543d0731de62eb747ccd5b636a6f4c for now.

Its an exploitable hole so we should revert both the bug fix *and* the
submission of the virtio console that makes the flaw triggerable, not jus
tthe security fix.

Alan
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