linux-kernel - Re: Apparent serious progressive ext4 data corruption bug in 3.6.3 (and other stable branches?)

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]

Date:	Wed, 24 Oct 2012 12:45:40 +0100
From:	Nix <nix@...eri.org.uk>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Eric Sandeen <sandeen@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Bryan Schumaker <bjschuma@...app.com>,
	Peng Tao <bergwolf@...il.com>, Trond.Myklebust@...app.com,
	gregkh@...uxfoundation.org,
	Toralf Förster <toralf.foerster@....de>
Subject: Re: Apparent serious progressive ext4 data corruption bug in 3.6.3 (and other stable branches?)

On 24 Oct 2012, Theodore Ts'o stated:

>                         Journal flushes outside of an unmount does
> happen as part of online resizing, the FIBMAP ioctl, or when the file
> system is frozen.  But it didn't sound like Toralf or Nix was using
> any of those features.

Quite so -- the corrupted filesystems have space reserved for resizing,
and one of them has been resized, years ago, but I haven't resized
either of them with this kernel, or with any kernel numbered 3.x for
that matter.

> Toralf, Nix, if you could try applying this patch (at the end of this
> message), and let me know how and when the WARN_ON triggers, and if it
> does, please send the empty_bug_workaround plus the WARN_ON(1) report.
> I know about the case where a file system is mounted and then
> immediately unmounted, but we don't think that's the problematic case.
> If you see any other cases where WARN_ON is triggering, it would be
> really good to know....

I'll give it a test later today, after another backup has finished.
Daily backups are normally overkill, but I don't think they are right
now.

-- 
NULL && (void)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/