linux-kernel - Re: KASAN: vmalloc-out-of-bounds Read in bpf_trace

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Date:   Wed, 20 Jan 2021 23:14:11 -0800
From:   syzbot <syzbot+fad5d91c7158ce568634@...kaller.appspotmail.com>
To:     andrii@...nel.org, andriin@...com, ast@...nel.org,
        bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net,
        hawk@...nel.org, jakub.kicinski@...ronome.com,
        john.fastabend@...il.com, kafai@...com, kpsingh@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org, mingo@...hat.com,
        netdev@...r.kernel.org, rostedt@...dmis.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, xdp-newbies@...r.kernel.org,
        yhs@...com
Subject: Re: KASAN: vmalloc-out-of-bounds Read in bpf_trace_run7

syzbot has bisected this issue to:

commit 8b401f9ed2441ad9e219953927a842d24ed051fc
Author: Yonghong Song <yhs@...com>
Date:   Thu May 23 21:47:45 2019 +0000

    bpf: implement bpf_send_signal() helper

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=123408e7500000
start commit:   7d68e382 bpf: Permit size-0 datasec
git tree:       bpf-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=113408e7500000
console output: https://syzkaller.appspot.com/x/log.txt?x=163408e7500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e0c7843b8af99dff
dashboard link: https://syzkaller.appspot.com/bug?extid=fad5d91c7158ce568634
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1224daa4d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13dfabd0d00000

Reported-by: syzbot+fad5d91c7158ce568634@...kaller.appspotmail.com
Fixes: 8b401f9ed244 ("bpf: implement bpf_send_signal() helper")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection