[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20100930020406.GC23107@mail.oracle.com>
Date: Wed, 29 Sep 2010 19:04:07 -0700
From: Joel Becker <Joel.Becker@...cle.com>
To: oss-security <oss-security@...ts.openwall.com>
Subject: Small exposure in ocfs2 fast symlinks.
Hey Everyone,
We just discovered that ocfs2 could walk off the end of fast
symlinks -- that is, symlinks that are stored directly in the inode
block. ocfs2 terminates these with NUL characters, but a disk
corruption or an attacker with direct access to the ocfs2 disk could
overwrite the NUL. Following the symlink via the filesystem would walk
off the end of the in-memory block buffer. We're not sure how
exploitable this is, but I figured I'd provide a heads-up. The fix is
in ocfs2's git tree and will be sent upstream tonight. Erratas with the
fix are being built.
If someone thinks we should have a CVE, please provide me with
the number. Otherwise, just FYI.
Joel
--
Life's Little Instruction Book #267
"Lie on your back and look at the stars."
Joel Becker
Consulting Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
