Re: KASAN: slab-out-of-bounds Read in bpf_csum_update

[Daniel Borkmann]

On 06/04/2018 01:36 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:ÂÂÂ 0512e0134582 Merge tag 'xfs-4.17-fixes-3' of git://git.ker..
> git tree:ÂÂÂÂÂÂ upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17eb2d7b800000
> kernel config:Â https://syzkaller.appspot.com/x/.config?x=968b0b23c7854c0b
> dashboard link: https://syzkaller.appspot.com/bug?extid=efae31b384d5badbd620
> compiler:ÂÂÂÂÂÂ gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=162c6def800000
> C reproducer:ÂÂ https://syzkaller.appspot.com/x/repro.c?x=14fe3db7800000

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