From: Gerrit Renker <gerrit@erg.abdn.ac.uk>
To: Dan Rosenberg <drosenberg@vsecurity.com>
Cc: davem@davemloft.net, dccp@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
security@kernel.org
Subject: Re: [PATCH] dccp: handle invalid feature options length
Date: Fri, 6 May 2011 21:57:33 +0200 [thread overview]
Message-ID: <20110506195733.GA3527@gerrit.erg.abdn.ac.uk> (raw)
In-Reply-To: <1304688438.29544.16.camel@dan>
Quoting Dan Rosenberg:
| A length of zero (after subtracting two for the type and len fields) for
| the DCCPO_{CHANGE,CONFIRM}_{L,R} options will cause an underflow due to
| the subtraction. The subsequent code may read past the end of the
| options value buffer when parsing. I'm unsure of what the consequences
| of this might be, but it's probably not good.
|
Please disregard my earlier message, I erred.
Dan is right, his patch is correct and definitively valid.
A length of 0 would be cast to 0xff and then cause buffer overrun.
| Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
| Cc: stable@kernel.org
Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
next prev parent reply other threads:[~2011-05-06 19:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-06 13:27 [PATCH] dccp: handle invalid feature options length Dan Rosenberg
2011-05-06 13:53 ` Gerrit Renker
2011-05-06 14:43 ` Dan Rosenberg
2011-05-06 19:57 ` Gerrit Renker [this message]
2011-05-06 20:04 ` David Miller
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