netdev - Re: KASAN: slab-out-of-bounds Read in bpf_skb_change

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Date:   Mon, 11 Jun 2018 11:42:58 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     syzbot <syzbot+d2d729bdde65dee3eae6@...kaller.appspotmail.com>,
        ast@...nel.org, davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: slab-out-of-bounds Read in bpf_skb_change_proto

On 06/10/2018 05:27 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    a16afaf7928b Merge tag 'for-v4.18' of git://git.kernel.org..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1338f6bf800000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=314f2150f36c16ca
> dashboard link: https://syzkaller.appspot.com/bug?extid=d2d729bdde65dee3eae6
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1173381f800000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=171f90cf800000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+d2d729bdde65dee3eae6@...kaller.appspotmail.com

#syz fix: bpf: reject passing modified ctx to helper functions