linux-hardening - Re: [PATCH] string: Remove strlcpy()

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Message-ID: <202401191141.F6902E74D@keescook>
Date: Fri, 19 Jan 2024 11:58:34 -0800
From: Kees Cook <keescook@...omium.org>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Andy Shevchenko <andy@...nel.org>,
	Azeem Shaikh <azeemshaikh38@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
	Dwaipayan Ray <dwaipayanray1@...il.com>,
	Lukas Bulwahn <lukas.bulwahn@...il.com>,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] string: Remove strlcpy()

On Fri, Jan 19, 2024 at 06:05:19PM +0200, Andy Shevchenko wrote:
> On Fri, Jan 19, 2024 at 12:33 AM Kees Cook <keescook@...omium.org> wrote:
> >
> > With all the users of strlcpy() removed[1] from the kernel, remove the
> > API, self-tests, and other references. Leave mentions in Documentation
> > (about its deprecation), and in checkpatch.pl (to help migrate host-only
> > tools/ usage). Long live strscpy().
> 
> ...
> 
> >   * Copies at most dstsize - 1 bytes into the destination buffer.
> > - * Unlike strlcpy the destination buffer is always padded out.
> > + * Unlike strscpy the destination buffer is always padded out.
> 
> While at it, please use the strscpy() form to refer to the function.

Oh, with the trailing "()"? Sure! Good call.

-Kees

> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

Thanks!

-Kees

-- 
Kees Cook