linux-hardening - Re: [PATCH] init: replace deprecated strncpy with strscpy

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Date: Thu, 4 Apr 2024 13:51:53 -0700
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] init: replace deprecated strncpy with strscpy_pad

On Tue, Apr 02, 2024 at 08:39:49PM +0000, Justin Stitt wrote:
> strncpy() is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
> 
> data_page wants to be NUL-terminated and NUL-padded, use strscpy_pad to
> provide both of these. data_page no longer awkwardly relies on
> init_mount to perform its NUL-termination, although that sanity check is
> left unchanged.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

This looks good. Thanks!

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

-- 
Kees Cook