Re: WARNING in rds_cmsg_rdma_args

Santosh Shilimkar
2018-01-03T18:43:11Z

On 1/3/2018 12:58 AM, syzbot wrote:
> Hello,
>
> syzkaller hit the following crash on
> ad036b63ee57df9ab802a4eb20cbbbec66aa4520
> git://git.cmpxchg.org/linux-mmots.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See

>
> for information about syzkaller reproducers
>
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+ef175b5825285531eabf-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> audit: type=1400 audit(1514947982.760:7): avc:  denied  { map } for
> pid=3468 comm="syzkaller284818" path="/root/syzkaller284818499"
> 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
> WARNING: CPU: 1 PID: 3468 at net/rds/rdma.c:617
> rds_cmsg_rdma_args+0xe96/0x1360 net/rds/rdma.c:617
> Kernel panic - not syncing: panic_on_warn set ...
>
+Mohamed Ghannam, who was discussing similar issue and was going
to post fix for it. Checking args->nr_local against 0 upfront would
address this issue as well.

Regards,
Santosh
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