linux-kernel - Re: [PATCH v2] hwmon: (pmbus/max20730) Remove strlcpy occurences

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Message-ID: <202307121637.05F0B4C1@keescook>
Date:   Wed, 12 Jul 2023 16:37:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        linux-hardening@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jean Delvare <jdelvare@...e.com>
Subject: Re: [PATCH v2] hwmon: (pmbus/max20730) Remove strlcpy occurences

On Wed, Jul 12, 2023 at 09:43:07PM +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 direct assignment.
> 
> strlcpy in this file is used to copy fixed-length strings which can be
> completely avoided by direct assignment and is safe to do so. strlen()
> is used to return the length of @tbuf.
> 
> [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: Kees Cook <keescook@...omium.org>

-- 
Kees Cook