netdev - Re: [syzbot] KASAN: vmalloc-out-of-bounds Read in bpf_jit

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Message-ID: <CAPhsuW5JhG07TYKKHRbNVtepOLjZ2ekibePyyqCwuzhH0YoP7Q@mail.gmail.com>
Date:   Tue, 15 Feb 2022 17:37:59 -0800
From:   Song Liu <song@...nel.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     syzbot <syzbot+2f649ec6d2eea1495a8f@...kaller.appspotmail.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        KP Singh <kpsingh@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs@...glegroups.com, Yonghong Song <yhs@...com>
Subject: Re: [syzbot] KASAN: vmalloc-out-of-bounds Read in bpf_jit_free

On Mon, Feb 14, 2022 at 10:41 PM Song Liu <song@...nel.org> wrote:
>
> On Mon, Feb 14, 2022 at 3:52 PM Daniel Borkmann <daniel@...earbox.net> wrote:
> >
> > Song, ptal.
> >
> > On 2/14/22 7:45 PM, syzbot wrote:
> > > Hello,
> > >
> > > syzbot found the following issue on:
> > >
> > > HEAD commit:    e5313968c41b Merge branch 'Split bpf_sk_lookup remote_port..
> > > git tree:       bpf-next
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=10baced8700000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=c40b67275bfe2a58
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=2f649ec6d2eea1495a8f

How do I run the exact same syzkaller? I am doing something like

./bin/syz-manager -config qemu.cfg

with the cfg file like:

{
        "target": "linux/amd64",
        "http": ":56741",
        "workdir": "workdir",
        "kernel_obj": "linux",
        "image": "./pkg/mgrconfig/testdata/stretch.img",
        "syzkaller": ".",
        "disable_syscalls": ["keyctl", "add_key", "request_key"],
        "suppressions": ["some known bug"],
        "procs": 8,
        "type": "qemu",
        "vm": {
                "count": 16,
                "cpu": 2,
                "mem": 2048,
                "kernel": "linux/arch/x86/boot/bzImage"
        }
}

Is this correct? I am using stretch.img from syzkaller site, and the
.config from
the link above.

Thanks,
Song