linux-hardening - Re: [RFC] string: Allow 2-argument strscpy()

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Message-ID: <ZcPDMZFPY08S4MGR@duo.ucw.cz>
Date: Wed, 7 Feb 2024 18:51:45 +0100
From: Pavel Machek <pavel@....cz>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Kees Cook <keescook@...omium.org>, Andy Shevchenko <andy@...nel.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] string: Allow 2-argument strscpy()

Hi!

> > Using sizeof(dst) is the overwhelmingly common case for strscpy().
> > Instead of requiring this everywhere, allow a 2-argument version to be
> > used that will use the sizeof() internally.
> 
> Yeah, this is definitely the case. I have a ton of patches replacing
> strncpy with strscpy [1] and many of them match the pattern of:
> | strscpy(dest, src, sizeof(dest))
> 
> BTW, this hack for function overloading is insane. Never really looked into
> it before.

This hack is insane, but this is also highly confusing, please don't
do this.

BR,
									Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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