linux-kernel - Re: [syzbot] KASAN: slab-out-of-bounds Write in bpf_prog_test_run

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Date:   Thu, 3 Feb 2022 17:47:55 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     syzbot <syzbot+6d70ca7438345077c549@...kaller.appspotmail.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "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>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Yonghong Song <yhs@...com>
Subject: Re: [syzbot] KASAN: slab-out-of-bounds Write in bpf_prog_test_run_xdp

On Thu, Feb 3, 2022 at 10:11 AM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> > Lorenzo, please take a look. I suspect it's xdp frags related.
>
> Hi Alexei,
>
> do you think it is worth to add a test for this condition in
> test_xdp_update_frags()?

you mean instead of 9000 and implicit PAGE_SIZE splitting
allocate explicit PAGE_SIZE * MAX_SKB_FRAGS ?
Yeah. Would be nice.