linux-kernel - Re: [PATCH] of/flattree: Replace all non-returning strlcpy with strscpy

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Message-Id: <168676772560.1899515.3929819267192716409.b4-ty@chromium.org>
Date:   Wed, 14 Jun 2023 11:35:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     monstr@...str.eu, azeemshaikh38@...il.com
Cc:     Kees Cook <keescook@...omium.org>, linux-hardening@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of/flattree: Replace all non-returning strlcpy with strscpy

On Tue, 30 May 2023 16:22:02 +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.
> 
> [...]

Build tested defconfig with GCC 13.1 from:
https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/13.1.0/

Applied to for-next/hardening, thanks!

[1/1] of/flattree: Replace all non-returning strlcpy with strscpy
      https://git.kernel.org/kees/c/a7969f58df35

-- 
Kees Cook