linux-kernel - Re: [PATCH bpf v3] riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO

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Message-Id: <167035741569.3897.9540113126251004476.git-patchwork-notify@kernel.org>
Date:   Tue, 06 Dec 2022 20:10:15 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Pu Lehui <pulehui@...weicloud.com>
Cc:     bpf@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, bjorn@...nel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, pulehui@...wei.com
Subject: Re: [PATCH bpf v3] riscv,
 bpf: Emit fixed-length instructions for BPF_PSEUDO_FUNC

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Tue,  6 Dec 2022 17:14:10 +0800 you wrote:
> From: Pu Lehui <pulehui@...wei.com>
> 
> For BPF_PSEUDO_FUNC instruction, verifier will refill imm with
> correct addresses of bpf_calls and then run last pass of JIT.
> Since the emit_imm of RV64 is variable-length, which will emit
> appropriate length instructions accorroding to the imm, it may
> broke ctx->offset, and lead to unpredictable problem, such as
> inaccurate jump. So let's fix it with fixed-length instructions.
> 
> [...]

Here is the summary with links:
  - [bpf,v3] riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO_FUNC
    https://git.kernel.org/bpf/bpf-next/c/b54b6003612a

You are awesome, thank you!
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