linux-kernel - Re: [PATCH 7/9] riscv: bpf: Avoid breaking W^X

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Date:   Fri, 11 Jun 2021 18:41:16 +0200
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Björn Töpel <bjorn@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH 7/9] riscv: bpf: Avoid breaking W^X

On Jun 12 2021, Jisheng Zhang wrote:

> I reproduced an kernel panic with the defconfig on qemu, but I'm not sure whether
> this is the issue you saw, I will check.
>
>     0.161959] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
> [    0.167028] pinctrl core: initialized pinctrl subsystem
> [    0.190727] Unable to handle kernel paging request at virtual address ffffffff81651bd8
> [    0.191361] Oops [#1]
> [    0.191509] Modules linked in:
> [    0.191814] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.0-rc5-default+ #3
> [    0.192179] Hardware name: riscv-virtio,qemu (DT)
> [    0.192492] epc : __memset+0xc4/0xfc
> [    0.192712]  ra : skb_flow_dissector_init+0x22/0x86

Yes, that's the same.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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