linux-hardening - Re: [PATCH] mac80211: Replace strlcpy with strscpy

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Message-ID: <ZImuCnPBF8jkUZ1w@corigine.com>
Date:   Wed, 14 Jun 2023 14:09:46 +0200
From:   Simon Horman <simon.horman@...igine.com>
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] mac80211: Replace strlcpy with strscpy

On Tue, Jun 13, 2023 at 12:34:04AM +0000, Azeem Shaikh 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 LOCAL_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>

Reviewed-by: Simon Horman <simon.horman@...igine.com>