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Date: Tue, 30 Jan 2018 18:55:32 -0800 From: Santosh Shilimkar <santosh.shilimkar@...cle.com> To: Eric Biggers <ebiggers3@...il.com> Cc: syzkaller-bugs@...glegroups.com, Avinash Repaka <avinash.repaka@...cle.com>, syzbot <bot+9461c9b9d340854a404b46c42cbfc91ded1232d8@...kaller.appspotmail.com>, davem@...emloft.net, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org, netdev@...r.kernel.org, rds-devel@....oracle.com Subject: Re: KASAN: stack-out-of-bounds Read in rds_sendmsg On 1/30/2018 6:16 PM, Eric Biggers wrote: > 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. >> [...] > > 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 > Thanks Eric for confirmation !! Regards, Santosh
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