netdev - Re: [PATCH net v2] net/sched: flower: fix possible OOB write in fl_set_geneve

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZHdnOnDaWYPEzQ/m@corigine.com>
Date: Wed, 31 May 2023 17:26:50 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Hangyu Hua <hbh25y@...il.com>
Cc: jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, pieter.jansen-van-vuuren@....com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net/sched: flower: fix possible OOB write in
 fl_set_geneve_opt()

On Wed, May 31, 2023 at 06:28:04PM +0800, Hangyu Hua wrote:
> If we send two TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets and their total
> size is 252 bytes(key->enc_opts.len = 252) then
> key->enc_opts.len = opt->length = data_len / 4 = 0 when the third
> TCA_FLOWER_KEY_ENC_OPTS_GENEVE packet enters fl_set_geneve_opt. This
> bypasses the next bounds check and results in an out-of-bounds.
> 
> Fixes: 0a6e77784f49 ("net/sched: allow flower to match tunnel options")
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>