Re: WARNING: bad usercopy in put_cmsg

[Kees Cook]

On Wed, Feb 7, 2018 at 4:33 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote:
> On Tue, Feb 6, 2018 at 6:31 PM, syzbot
> <syzbot+c4dcac91687a29cbae15@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>> Hello,
>>
>> syzbot hit the following crash on upstream commit
>> e237f98a9c134c3d600353f21e07db915516875b (Mon Feb 5 21:35:56 2018 +0000)
>> Merge tag 'xfs-4.16-merge-5' of
>> git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
>>
>> So far this crash happened 8 times on net-next, upstream.
>> C reproducer is attached.
>> syzkaller reproducer is attached.
>> Raw console output is attached.
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached.
>
> #syz dup: WARNING in usercopy_warn
>
> Let's make that one the main copy, since Kees is already looking at it.

This one has a more descriptive subject, can we dup towards this one?
Whatever the case, yup, still working on it.

-Kees

-- 
Kees Cook
Pixel Security