Re: [PATCH] x86, kasan: add KASAN checks to atomic operations

From: Peter Zijlstra <peterz@infradead.org>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Ingo Molnar <mingo@redhat.com>,
	kasan-dev <kasan-dev@googlegroups.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH] x86, kasan: add KASAN checks to atomic operations
Date: Mon, 6 Mar 2017 16:20:13 +0100	[thread overview]
Message-ID: <20170306152013.GN6500@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CACT4Y+ZDxk2CkaGaqVJfrzoBf4ZXDZ2L8vaAnLOjuY0yx85jgA@mail.gmail.com>

On Mon, Mar 06, 2017 at 03:24:23PM +0100, Dmitry Vyukov wrote:
> We could also provide a parallel implementation of atomic ops based on
> the new compiler builtins (__atomic_load_n and friends):
> https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
> and enable it under KSAN. The nice thing about it is that it will
> automatically support arm64 and KMSAN and KTSAN.
> But it's more work.

There's a summary out there somewhere, I think Will knows, that explain
how the C/C++ memory model and the Linux Kernel Memory model differ and
how its going to be 'interesting' to make using the C/C++ builtin crud
with the kernel 'correct.

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