linux-kernel - Re: [PATCH] net: sched: cls_u32: Avoid memcpy() false-positive warning

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Date:   Fri, 30 Sep 2022 02:21:08 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Kees Cook <keescook@...omium.org>
Cc:     jhs@...atatu.com, edumazet@...gle.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        syzbot+a2c4601efc75848ba321@...kaller.appspotmail.com,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net: sched: cls_u32: Avoid memcpy() false-positive warning

Hello:

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

On Tue, 27 Sep 2022 08:37:01 -0700 you wrote:
> To work around a misbehavior of the compiler's ability to see into
> composite flexible array structs (as detailed in the coming memcpy()
> hardening series[1]), use unsafe_memcpy(), as the sizing,
> bounds-checking, and allocation are all very tightly coupled here.
> This silences the false-positive reported by syzbot:
> 
>   memcpy: detected field-spanning write (size 80) of single field "&n->sel" at net/sched/cls_u32.c:1043 (size 16)
> 
> [...]

Here is the summary with links:
  - net: sched: cls_u32: Avoid memcpy() false-positive warning
    https://git.kernel.org/netdev/net-next/c/7cba18332e36

You are awesome, thank you!
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