linux-hardening - Re: [PATCH 1/4] locking/atomic/x86: Silence intentional wrapping addition

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Date: Thu, 2 May 2024 07:57:02 -0700
From: Kees Cook <keescook@...omium.org>
To: David Howells <dhowells@...hat.com>
Cc: Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Jakub Kicinski <kuba@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Uros Bizjak <ubizjak@...il.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
	netdev@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 1/4] locking/atomic/x86: Silence intentional wrapping
 addition

On Fri, Apr 26, 2024 at 08:40:50AM +0100, David Howells wrote:
> Kees Cook <keescook@...omium.org> wrote:
> 
> > -	return i + xadd(&v->counter, i);
> > +	return wrapping_add(int, i, xadd(&v->counter, i));
> 
> Ewww.  Can't you just mark the variable as wrapping in some way, either by:
> 
> 	unsigned int __cyclic counter;

Yeah, that's the plan now. Justin is currently working on the "wraps"
attribute for Clang:
https://github.com/llvm/llvm-project/pull/86618

-- 
Kees Cook