linux-kernel - Re: BUG: KASAN: use-after-free in page_to

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Message-ID: <CANn89iKKXcuczM9XUbg3ntLUFMLdaJCO5ojNJ+UT4kaTVKuE+g@mail.gmail.com>
Date:   Tue, 20 Apr 2021 16:16:48 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     virtualization@...ts.linux-foundation.org,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, linux-mm <linux-mm@...ck.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Alan Bennett <alan.bennett@...aro.org>
Subject: Re: BUG: KASAN: use-after-free in page_to_skb.isra.0+0x300/0x418

On Tue, Apr 20, 2021 at 3:45 PM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> Following kernel BUG reported on qemu-arm64 running linux next 20210420
> the config is enabled with KASAN.
>
> steps to reproduce:
> ----------------------------
> - Build the arm64 kernel with KASAN enabled.
> - boot it with below command and you will notice
>  /usr/bin/qemu-system-aarch64 -cpu host -machine virt,accel=kvm
> -nographic -net nic,model=virtio,macaddr=BA:DD:AD:CC:09:10 -net tap -m
> 1024 -monitor none -kernel kernel/Image.gz --append "console=ttyAMA0
> root=/dev/vda rw" -hda
> rootfs/rpb-console-image-lkft-juno-20210414125244-133.rootfs.ext4 -m
> 4096 -smp 4 -nographic
>
>
> crash log:
> -------------
>

This is the fifth report, have you tried the proposed fix ?

https://patchwork.kernel.org/project/netdevbpf/patch/20210420094341.3259328-1-eric.dumazet@gmail.com/