linux-ext4 - [Bug 25352] resizing ext4 will corrupt filesystem

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 for Android: free password hash cracker in your pocket

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

Message-Id: <201012210405.oBL45LrG021745@demeter2.kernel.org>
Date:	Tue, 21 Dec 2010 04:05:21 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 25352] resizing ext4 will corrupt filesystem

https://bugzilla.kernel.org/show_bug.cgi?id=25352

--- Comment #3 from Theodore Tso <tytso@....edu>  2010-12-21 04:05:20 ---
On Mon, Dec 20, 2010 at 08:56:46PM +0000, bugzilla-daemon@...zilla.kernel.org
wrote:
> 
> Using resize2fs on an ext4 will result in a corrupted filesystem. This is a
> regression (obviously).

Yes, this is a regression new to 2.6.37-rc1, which was introduced by
commit a31437b85: ext4: use sb_issue_zeroout in setup_new_group_blocks.

When we replaced the loop zero'ing the inode table blocks with
sb_issue_zeroout, we accidentally also removed this little tidbit:

-               ext4_set_bit(bit, bh->b_data);

... which was responsible for setting the block allocation bitmap to
reserve the block descriptor blocks and inode table blocks.  Oops...

I believe this patch should fix things.

                        - Ted

-- 
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching the assignee of the bug.
--
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