lkml.org 
[lkml]   [2017]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: KASAN: use-after-free Read in aead_recvmsg
On Mon, Nov 27, 2017 at 11:29:44PM -0800, Eric Biggers wrote:
>
> >From 453b54793e843c0d5b8fd2d5e33fcc5427ec038e Mon Sep 17 00:00:00 2001
> From: Eric Biggers <ebiggers@google.com>
> Date: Mon, 27 Nov 2017 23:23:05 -0800
> Subject: [PATCH] crypto: algif_aead - fix reference counting of null skcipher
>
> In the AEAD interface for AF_ALG, the reference to the "null skcipher"
> held by each tfm was being dropped in the wrong place -- when each
> af_alg_ctx was freed instead of when the aead_tfm was freed. As
> discovered by syzkaller, a specially crafted program could use this to
> cause the null skcipher to be freed while it is still in use.
>
> Fix it by dropping the reference in the right place.
>
> Fixes: 72548b093ee3 ("crypto: algif_aead - copy AAD from src to dst")
> Reported-by: syzbot <syzkaller@googlegroups.com>
> Cc: <stable@vger.kernel.org> # v4.14+
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Patch applied. Thanks.
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

\
 
 \ /
  Last update: 2017-11-29 06:24    [W:0.059 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site