linux-hardening - Re: [PATCH v2] intersil: Use struct

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Message-ID: <163818272249.17830.17168660847837194015.kvalo@codeaurora.org>
Date:   Mon, 29 Nov 2021 10:45:28 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jouni Malinen <j@...fi>, Kees Cook <keescook@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Allen Pais <allen.lkml@...il.com>,
        Romain Perier <romain.perier@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Vaibhav Gupta <vaibhavgupta40@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] intersil: Use struct_group() for memcpy() region

Kees Cook <keescook@...omium.org> wrote:

> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memcpy(), memmove(), and memset(), avoid
> intentionally writing across neighboring fields.
> 
> Use struct_group() in struct hfa384x_tx_frame around members
> frame_control, duration_id, addr1, addr2, addr3, and seq_ctrl, so they
> can be referenced together. This will allow memcpy() and sizeof() to
> more easily reason about sizes, improve readability, and avoid future
> warnings about writing beyond the end of frame_control.
> 
> "pahole" shows no size nor member offset changes to struct
> hfa384x_tx_frame. "objdump -d" shows no object code changes.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>

Patch applied to wireless-drivers-next.git, thanks.

601d2293e27f intersil: Use struct_group() for memcpy() region

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20211119004646.2347920-1-keescook@chromium.org/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches