linux-kernel - Re: [PATCH bpf] bpf: Temporarily disable atomic operations in BPF arena

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Date: Thu, 14 Mar 2024 19:10:30 +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, memxor@...il.com, bpf@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf] bpf: Temporarily disable atomic operations in BPF arena

Hello:

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

On Thu, 14 Mar 2024 17:49:31 +0000 you wrote:
> Currently, the x86 JIT handling PROBE_MEM32 tagged accesses is not
> equipped to handle atomic accesses into PTR_TO_ARENA, as no PROBE_MEM32
> tagging is performed and no handling is enabled for them.
> 
> This will lead to unsafety as the offset into arena will dereferenced
> directly without turning it into a base + offset access into the arena
> region.
> 
> [...]

Here is the summary with links:
  - [bpf] bpf: Temporarily disable atomic operations in BPF arena
    https://git.kernel.org/bpf/bpf/c/44d79142ede8

You are awesome, thank you!
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