From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Biggers Subject: Re: KASAN: stack-out-of-bounds Read in rds_sendmsg Date: Tue, 30 Jan 2018 18:16:38 -0800 Message-ID: <20180131021638.6h5fukvzzakzu5g2@gmail.com> References: <089e08263e589121d90560d610a5@google.com> <9deaf3c4-227f-f6f0-9ccb-3ad05fc32a0c@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Cc: syzkaller-bugs@googlegroups.com, Avinash Repaka , syzbot , davem@davemloft.net, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, rds-devel@oss.oracle.com To: Santosh Shilimkar Return-path: Content-Disposition: inline In-Reply-To: <9deaf3c4-227f-f6f0-9ccb-3ad05fc32a0c@oracle.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Thu, Dec 21, 2017 at 08:44:32AM -0800, Santosh Shilimkar wrote: > +Avinash > > On 12/21/2017 1:10 AM, syzbot wrote: > > syzkaller has found reproducer for the following crash on > > [..] > > > > > audit: type=1400 audit(1513847224.110:7): avc:  denied  { map } for > > pid=3157 comm="syzkaller455006" path="/root/syzkaller455006870" > > dev="sda1" ino=16481 > > scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 > > tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 > > ================================================================== > > BUG: KASAN: stack-out-of-bounds in rds_rdma_bytes net/rds/send.c:1013 > > [inline] > > Could you please post the discussed fix if you are ready with it ? > This new report is same as last one and cmesg length check should > address it. > > Regards, > Santosh > This crash seems to have stopped occurring. I assume it was fixed by commit 14e138a86f63 (thanks Avinash!), so let's tell syzbot so that it can start reporting crashes in the same place again: #syz fix: RDS: Check cmsg_len before dereferencing CMSG_DATA - Eric