linux-kernel - Re: KASAN: use-after-free Read in bpf_csum

lists.openwall.net		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 linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <732ecdd6-135d-7a3e-6c06-fb098c65d76f@iogearbox.net>
Date:   Fri, 8 Jun 2018 11:52:54 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     syzbot <syzbot+3d0b2441dbb71751615e@...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: use-after-free Read in bpf_csum_update

On 06/04/2018 01:36 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    bcece5dc40b9 bpf: Change bpf_fib_lookup to return -EAFNOSU..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=161e2c6f800000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e4078980b886800c
> dashboard link: https://syzkaller.appspot.com/bug?extid=3d0b2441dbb71751615e
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=17cb5adf800000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17ebf19f800000

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