Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Tue, 30 May 2023 16:21:09 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Azeem Shaikh <azeemshaikh38@gmail.com>
Cc:     Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        linux-hardening@vger.kernel.org, linux-sh@vger.kernel.org,
        linux-kernel@vger.kernel.org, Randy Dunlap <rdunlap@infradead.org>
Subject: Re: [PATCH] sh: Replace all non-returning strlcpy with strscpy
Message-ID: <202305301621.BD4A8EA78F@keescook>
References: <20230530163041.985456-1-azeemshaikh38@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230530163041.985456-1-azeemshaikh38@gmail.com>
Precedence: bulk

On Tue, May 30, 2023 at 04:30:41PM +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@gmail.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook