linux-ext4 - [PATCH 0/4] jbd: possible filesystem corruption fixes

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-next>] [day] [month] [year] [list]

Message-ID: <48089B86.5020108@hitachi.com>
Date:	Fri, 18 Apr 2008 22:00:54 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	akpm@...ux-foundation.org, sct@...hat.com, adilger@...sterfs.com
Cc:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	jack@...e.cz, sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>
Subject: [PATCH 0/4] jbd: possible filesystem corruption fixes

Subject: [PATCH 0/4] jbd: possible filesystem corruption fixes

The current JBD is not sufficient for I/O error handling.  It can
cause filesystem corruption.   An example scenario:

1. fail to write a metadata buffer to block B in the journal
2. succeed to write the commit record
3. the system crashes, reboots and mount the filesystem
4. in the recovery phase, succeed to read data from block B
5. write back the read data to the filesystem, but it is a stale
   metadata
6. lose some files and directories!

This scenario is a rare case, but it (temporal I/O error)
can occur.  If we abort the journal between 1. and 2., this
tragedy can be avoided.

This patch set fixes several error handling problems to protect
from filesystem corruption caused by I/O errors.  It has been
done only for JBD and ext3 parts.

This patch is against 2.6.25

[PATCH 1/4] jbd: strictly check for write errors on data buffers
[PATCH 2/4] jbd: ordered data integrity fix
[PATCH 3/4] jbd: abort when failed to log metadata buffers
[PATCH 4/4] jbd: fix error handling for checkpoint io

Regards,
-- 
Hidehiro Kawai
Hitachi, Systems Development Laboratory
Linux Technology Center

--
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