lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 25 Oct 2017 12:01:35 -0700
From:   Eric Dumazet <>
To:     Willem de Bruijn <>,
        Jason Wang <>
Cc:     Wei Wei <>, Dmitry Vyukov <>,
        Mark Rutland <>,,
        LKML <>,
        netdev <>,
        David Miller <>,
        Willem de Bruijn <>,
        syzkaller <>
Subject: Re: v4.14-rc3/arm64 DABT exception in atomic_inc() / __skb_clone()

On Wed, Oct 25, 2017 at 11:49 AM, Willem de Bruijn
<> wrote:

> From skb->dev and netdev_priv, the tun device has flags 0x1002 ==
> IFF_TAP | IFF_NO_PI. This kernel precedes the recent support for
> IFF_NAPI and IFF_NAPI_FRAGS. The allocation most likely happened
> in tun_build_skb from current->task_frag. It would be a previous
> allocation that left alloc_frag->offset unaligned. But perhaps this code
> needs to perform alignment before setting skb->head. At least on
> platforms where atomic on dataref must be aligned.


Bug added in commit 66ccbc9c87c2 ("tap: use build_skb() for small packet")

Powered by blists - more mailing lists