linux-kernel - Re: [PATCH] hfs: fix oops on mount with corrupted btree extent records

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: <14762.1255407123@turing-police.cc.vt.edu>
Date:	Tue, 13 Oct 2009 00:12:03 -0400
From:	Valdis.Kletnieks@...edu
To:	Jeff Mahoney <jeffm@...e.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Roman Zippel andr <zippel@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] hfs: fix oops on mount with corrupted btree extent records

On Mon, 12 Oct 2009 20:41:37 EDT, Jeff Mahoney said:
>  A particular fsfuzzer run caused an hfs file system to crash on mount. This
>  is due to a corrupted MDB extent record causing a miscalculation of
>  HFS_I(inode)->first_blocks for the extent tree. If the extent records
>  are zereod out, it won't trigger the first_blocks special case. Instead
>  it falls through to the extent code which we're still in the middle
>  of initializing.
> 
>  This patch catches the 0 size extent records, reports the corruption,
>  and fails the mount.

Just for completeness - does the current fsck.hfs already know how to fix it, or
at least heave stuff over the side so the filesystem is self-consistent again?
Or will a user who hits this need a new fsck.hfs to get it back to mountable?

Content of type "application/pgp-signature" skipped