linux-ext4 - Re: [PATCH] ext4: fix a big-endian bug when an extent is zeroed out

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130403143406.GA3006@wallace>
Date:	Wed, 3 Apr 2013 10:34:06 -0400
From:	Eric Whitney <enwlinux@...il.com>
To:	Theodore Ts'o <tytso@....edu>,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	Christian Kujau <lists@...dbynature.de>,
	CAI Qian <caiqian@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Steve Best <sbest@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: fix a big-endian bug when an extent is zeroed out

* Theodore Ts'o <tytso@....edu>:
> On Wed, Apr 03, 2013 at 06:22:04PM +0800, Zheng Liu wrote:
> > Subject: [PATCH] ext4: fix a big-endian bug when an extent is zeroed out
> > 
> > From: Zheng Liu <wenqing.lz@...bao.com>
> > 
> > When an extent was zeroed out, we forgot to do convert from cpu to le16.
> > It could make us hit a BUG_ON when we try to write dirty pages out.  So
> > fix it.
> > 
> > Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
> 
> Thanks for finding this!  I think we should push this to Linus right
> away, and not wait for the next merge window.  The bug has been here
> for a long time, but it was unmasked by the fact that we unbroke
> extent zeroing in 3.9-rcX.
> 
> I have two big questions.  (1) Shouldn't Eric Whitney have picked this
> up with his ARM pandaboard testing, since IIRC it's big-endian as
> well?  If not, is there something we can do to improve our testing wrt
> to big-endian systems?


The TI OMAP4 processor on my Pandaboard test system is little endian.

Eric


> 
> And (2) does it make sense to have an inline function
> ext4_ext_set_len(len)?  It might save some lines of code, but more
> importantly, it might make it less likely that we will overlook this
> sort of bug in the future.
> 
> 					- Ted
> --
> To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html