linux-hardening - Re: [PATCH] um: Remove strlcpy declaration

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Date:   Wed, 12 Jul 2023 16:57:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-hardening@...r.kernel.org, linux-um@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Haowen Bai <baihaowen@...zu.com>
Subject: Re: [PATCH] um: Remove strlcpy declaration

On Mon, Jul 03, 2023 at 04:06:41PM +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@...il.com>

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

-- 
Kees Cook