Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Tue, 27 Mar 2018 08:55:55 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Kees Cook' <keescook@...omium.org>, Andrew Morton
	<akpm@...ux-foundation.org>
CC: Linus Torvalds <torvalds@...ux-foundation.org>, Martin Uecker
	<Martin.Uecker@....uni-goettingen.de>, Josh Poimboeuf <jpoimboe@...hat.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>, Randy Dunlap
	<rdunlap@...radead.org>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	"Ingo Molnar" <mingo@...nel.org>, Ian Abbott <abbotti@....co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: RE: [PATCH v6] kernel.h: Retain constant expression output for
 max()/min()

From: Kees Cook
> Sent: 26 March 2018 23:16
...
> +#define __typecheck(x, y) \
> +		(!!(sizeof((typeof(x)*)1 == (typeof(y)*)1)))

The two 1 should probably be at least 8 before the compiler starts
bleating about accesses to misaligned addresses being undefined.

	David

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