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Subject: Re: [PATCH bpf v3 0/2] bpf: Fix stack slot index for Spectre v4
 nospec
 checks
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <178209042679.554493.16748055730753195339.git-patchwork-notify@kernel.org>
Date: Mon, 22 Jun 2026 01:07:06 +0000
References: 
 <20260618-f01-11-stack-nospec-slot-index-v3-0-780297041721@mails.tsinghua.edu.cn>
In-Reply-To: 
 <20260618-f01-11-stack-nospec-slot-index-v3-0-780297041721@mails.tsinghua.edu.cn>
To: Nuoqi Gui <gnq25@mails.tsinghua.edu.cn>
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
 eddyz87@gmail.com, memxor@gmail.com, john.fastabend@gmail.com,
 martin.lau@linux.dev, luis.gerhorst@fau.de, shuah@kernel.org,
 bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
 linux-kernel@vger.kernel.org, jiayuan.chen@linux.dev, emil@etsalapatis.com

Hello:

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

On Thu, 18 Jun 2026 01:50:25 +0800 you wrote:
> check_stack_write_fixed_off() uses one byte-indexing scheme when checking
> whether a fixed-offset stack write needs Spectre v4 sanitization, and another
> scheme when recording the write into slot_type[].
> 
> For sub-8-byte writes this can make the sanitization check look at bytes that
> are not overwritten by the write. A zeroed lower half-slot followed by a write
> to the upper half-slot can therefore miss the nospec barrier for the second
> write.
> 
> [...]

Here is the summary with links:
  - [bpf,v3,1/2] bpf: Fix stack slot index in nospec checks
    https://git.kernel.org/bpf/bpf/c/d1d53aa30ab3
  - [bpf,v3,2/2] selftests/bpf: Cover stack nospec slot indexing
    https://git.kernel.org/bpf/bpf/c/a93ae7ed5972

You are awesome, thank you!
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