linux-kernel - Re: KASAN: slab-out-of-bounds Read in tun_net

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Date:   Wed, 2 Jan 2019 11:32:03 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        syzbot <syzbot+8993c0fa96d57c399735@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, edumazet@...gle.com,
        linux-kernel@...r.kernel.org, mst@...hat.com,
        netdev@...r.kernel.org, peterpenkov96@...il.com,
        sd@...asysnail.net, syzkaller-bugs@...glegroups.com,
        willemb@...gle.com
Subject: Re: KASAN: slab-out-of-bounds Read in tun_net_xmit (2)


On 2018/12/31 下午5:51, Jesper Dangaard Brouer wrote:
> Hi MST and Jason,
>
> Could you please take a look at this?  This bug is caused by a thread
> resizing the tun-queue (via tun_queue_resize -> ptr_ring_resize_multiple).
> And error happens in tun_net_xmit -> ptr_ring_produce.  My guess is bug
> happens when reading r->queue in ptr_ring_produce.
>
> I've look at the code (see diff comments below), but I cannot spot the
> issue as the (implicit) memory barrier of a spinlock should cover the
> cases I can imagine.


Hi:

Cong sent a patch for this and looks like it was fixed in 
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=aff6db454599d62191aabc208930e891748e4322.

Thanks