linux-kernel - Re: [PATCH v3] wifi: cfg80211: replace strlcpy() with strscpy()

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Date:   Wed, 14 Jun 2023 17:24:20 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     linux-hardening@...r.kernel.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Johannes Berg <johannes@...solutions.net>
Subject: Re: [PATCH v3] wifi: cfg80211: replace strlcpy() with strscpy()

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

> 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 WIPHY_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>
> ---
> v1: https://lore.kernel.org/all/20230612232301.2572316-1-azeemshaikh38@gmail.com/
> v2: https://lore.kernel.org/all/20230614134552.2108471-1-azeemshaikh38@gmail.com/

In the change log (after the "---" line) you should also describe what
changes you made, more info in the wiki below. In this case it's clear
as the patch is simple but please keep this in mind for future patches.

No need to resend because of this.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

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