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

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Message-ID: <ZKQrGaJzNlLse+js@corigine.com>
Date:   Tue, 4 Jul 2023 15:22:17 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        linux-hardening@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Ahern <dsahern@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kees Cook <keescook@...omium.org>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: Replace strlcpy with strscpy

On Mon, Jul 03, 2023 at 05:58:40PM +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().
> No return values were used, so direct replacement is safe.
> 
> [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>