linux-hardening - Re: [PATCH] net/mediatek: strlcpy withreturn

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Date:   Tue, 13 Jun 2023 08:35:39 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] net/mediatek: strlcpy withreturn

Azeem Shaikh <azeemshaikh38@...il.com> wrote:

> strlcpy() reads the entire source buffer first.
> This read may exceed the destination size limit.
> This is both inefficient and can lead to linear read
> overflows if a source string is not NUL-terminated [1].
> In an effort to remove strlcpy() completely [2], replace
> strlcpy() here with strscpy().
> 
> Direct replacement is safe here since DEV_ASSIGN is only used by
> TRACE macros and the return values are ignored.
> 
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> [2] https://github.com/KSPP/linux/issues/89
> 
> Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>

The title should be:

wifi: mt7601u: replace strlcpy() with strscpy()

I can fix that, no need to resend because of this.

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20230613003458.3538812-1-azeemshaikh38@gmail.com/

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