From: Dan Rosenberg <drosenberg@vsecurity.com>
To: socketcan@hartkopp.net, oliver.hartkopp@volkswagen.de,
urs.thuermann@volkswagen.de
Cc: netdev@vger.kernel.org, security@kernel.org
Subject: [SECURITY] CAN info leak/minor heap overflow
Date: Tue, 02 Nov 2010 14:28:23 -0400 [thread overview]
Message-ID: <1288722503.2504.14.camel@dan> (raw)
In bcm_connect() (in net/can/bcm.c), I noticed the following code:
sprintf(bo->procname, "%p", sock);
"procname" is a 9-byte char array. This code is wrong on two levels.
First, leaking a kernel address via a /proc filename is bad. Secondly,
on 64-bit platforms, up to 17 bytes may be copied into the buffer.
Fortunately, structure padding will most likely prevent this from being
a problem, except for the trailing NULL byte, which may overwrite the
first byte of the next heap object. Please name your procfile in a way
that doesn't leak information and fits into the desired name buffer.
-Dan
next reply other threads:[~2010-11-02 18:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-02 18:28 Dan Rosenberg [this message]
2010-11-02 19:43 ` [SECURITY] CAN info leak/minor heap overflow Oliver Hartkopp
2010-11-02 19:53 ` Dan Rosenberg
2010-11-02 19:57 ` [Security] " Linus Torvalds
2010-11-02 20:19 ` Oliver Hartkopp
2010-11-02 20:16 ` Oliver Hartkopp
2010-11-05 18:33 ` [PATCH] Fix " Urs Thuermann
2010-11-09 7:52 ` Oliver Hartkopp
2010-11-09 17:05 ` David Miller
2010-11-10 6:52 ` Oliver Hartkopp
2010-11-10 17:51 ` David Miller
2010-11-10 22:10 ` Oliver Hartkopp
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