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

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Message-ID: <CAHmME9pEu2cvrSQd+Rg8Cp=KDfKEfjeiPPgF-WecXLHyRZVjcw@mail.gmail.com>
Date:   Tue, 23 May 2023 18:47:41 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     edumazet@...gle.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 Tue, May 23, 2023 at 6:46 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 23 May 2023 18:14:18 +0200 Jason A. Donenfeld wrote:
> > So, IOW, not a wireguard bug, right?
>
> What's slightly concerning is that there aren't any other timers
> leading to
>
>   KASAN: slab-use-after-free Write in enqueue_timer
>
> :( If WG was just an innocent bystander there should be, right?

Well, WG does mod this timer for every single packet in its RX path.
So that's bound to turn things up I suppose.