linux-kernel - Re: [syzbot] [wireguard?] KASAN: slab-use-after-free Write in enqueue

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Date:   Wed, 24 May 2023 08:39:35 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        syzbot <syzbot+c2775460db0e1c70018e@...kaller.appspotmail.com>,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        pabeni@...hat.com, wireguard@...ts.zx2c4.com, jann@...jh.net
Subject: Re: [syzbot] [wireguard?] KASAN: slab-use-after-free Write in
 enqueue_timer

On Wed, 24 May 2023 08:33:41 -0700 Jakub Kicinski wrote:
> On Wed, 24 May 2023 10:24:31 +0200 Dmitry Vyukov wrote:
> > FWIW There are more report examples on the dashboard.
> > There are some that don't mention wireguard nor usbnet, e.g.:
> > https://syzkaller.appspot.com/text?tag=CrashReport&x=17dd2446280000
> > So that's probably red herring. But they all seem to mention alloc_netdev_mqs.  
> 
> While we have you, let me ask about the possibility of having vmcore
> access - I think it'd be very useful to solve this mystery. 
> With a bit of luck the timer still has the function set.

I take that back.

Memory state around the buggy address:
 ffff88801ecc1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801ecc1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801ecc1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb  
                   ^
 ffff88801ecc1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801ecc1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb