netdev - Re: [PATCH] cfg80211: cfg80211: strlcpy withreturn

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Date: Wed, 14 Jun 2023 10:40:00 +0300
From: Kalle Valo <kvalo@...nel.org>
To: Azeem Shaikh <azeemshaikh38@...il.com>
Cc: Johannes Berg <johannes@...solutions.net>,  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
Subject: Re: [PATCH] cfg80211: cfg80211: strlcpy withreturn

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>

The title should be:

wifi: cfg80211: replace strlcpy() with strlscpy()

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