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

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Message-ID: <32ff9867-ceeb-de21-afca-70eeb8282e89@iogearbox.net>
Date:   Tue, 22 Oct 2019 16:25:22 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     syzbot <syzbot+0cd01c9e0f5cd37a357e@...kaller.appspotmail.com>,
        ast@...nel.org, bpf@...r.kernel.org, davem@...emloft.net,
        hawk@...nel.org, jakub.kicinski@...ronome.com,
        john.fastabend@...il.com, kafai@...com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: KASAN: use-after-free Read in is_bpf_text_address

On 10/22/19 3:53 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    4fe34d61 Merge branch 'x86-urgent-for-linus' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15b01a60e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f0a8b0a0736a2ac1
> dashboard link: https://syzkaller.appspot.com/bug?extid=0cd01c9e0f5cd37a357e
> compiler:       clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=161f89f7600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16e2d0f8e00000

Fixed by (also just checked via syz test): https://patchwork.ozlabs.org/patch/1181358/

Thanks,
Daniel