linux-kernel - Re: [PATCH] sctp: integer overflow in sctp_auth_create

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]

Date:	Tue, 29 Nov 2011 14:24:01 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Vladislav Yasevich <vladislav.yasevich@...com>
Cc:	linux-kernel@...r.kernel.org, Sridhar Samudrala <sri@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	security@...nel.org
Subject: Re: [PATCH] sctp: integer overflow in sctp_auth_create_key()

Thanks for clarifying this!

I will leave the check there and incorporate your comments into a new patch.

- xi

On Nov 29, 2011, at 10:03 AM, Vladislav Yasevich wrote:
> 
> That should be ok as well.  There is an overflow guard in the api
> entry point so that should guard against overflows from user space.
> 
> On the network end I miscalculated a little.  The key is actually made up
> of user_key (1 short) + 2 * key_vector (3 shorts) for a total of 7*MAX_USHORT;
> however, that still will not overflow 32 bits.
> 
> -vlad

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/