linux-hardening - Re: [PATCH] skbuff: Extract list pointers to silence compiler warnings

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Date:   Thu, 09 Dec 2021 21:30:23 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Kees Cook <keescook@...omium.org>
Cc:     kuba@...nel.org, davem@...emloft.net, jonathan.lemon@...il.com,
        edumazet@...gle.com, elver@...gle.com, alobakin@...me,
        pabeni@...hat.com, cong.wang@...edance.com, talalahmad@...gle.com,
        haokexin@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] skbuff: Extract list pointers to silence compiler warnings

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Mon,  6 Dec 2021 22:27:58 -0800 you wrote:
> Under both -Warray-bounds and the object_size sanitizer, the compiler is
> upset about accessing prev/next of sk_buff when the object it thinks it
> is coming from is sk_buff_head. The warning is a false positive due to
> the compiler taking a conservative approach, opting to warn at casting
> time rather than access time.
> 
> However, in support of enabling -Warray-bounds globally (which has
> found many real bugs), arrange things for sk_buff so that the compiler
> can unambiguously see that there is no intention to access anything
> except prev/next.  Introduce and cast to a separate struct sk_buff_list,
> which contains _only_ the first two fields, silencing the warnings:
> 
> [...]

Here is the summary with links:
  - skbuff: Extract list pointers to silence compiler warnings
    https://git.kernel.org/netdev/net-next/c/1a2fb220edca

You are awesome, thank you!
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