linux-kernel - Re: [PATCH bpf v2] bpf: verifier: reject addr_space

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Date: Sat, 23 Mar 2024 03:50:28 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Puranjay Mohan <puranjay12@...il.com>
Cc: ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...gle.com,
 haoluo@...gle.com, jolsa@...nel.org, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu, bpf@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
 memxor@...il.com
Subject: Re: [PATCH bpf v2] bpf: verifier: reject addr_space_cast insn without
 arena

Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@...nel.org>:

On Fri, 22 Mar 2024 15:35:18 +0000 you wrote:
> The verifier allows using the addr_space_cast instruction in a program
> that doesn't have an associated arena. This was caught in the form an
> invalid memory access in do_misc_fixups() when while converting
> addr_space_cast to a normal 32-bit mov, env->prog->aux->arena was
> dereferenced to check for BPF_F_NO_USER_CONV flag.
> 
> Reject programs that include the addr_space_cast instruction but don't
> have an associated arena.
> 
> [...]

Here is the summary with links:
  - [bpf,v2] bpf: verifier: reject addr_space_cast insn without arena
    https://git.kernel.org/bpf/bpf/c/122fdbd2a030

You are awesome, thank you!
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