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

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Message-ID: <20170306160403.GB18519@leverpostej>
Date:   Mon, 6 Mar 2017 16:04:03 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Ingo Molnar <mingo@...hat.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH] x86, kasan: add KASAN checks to atomic operations

On Mon, Mar 06, 2017 at 04:20:13PM +0100, Peter Zijlstra wrote:
> 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.

Trivially, The C++ model doesn't feature I/O ordering [1]...

Otherwise Will pointed out a few details in [2].

Thanks,
Mark.

[1] https://lwn.net/Articles/698014/
[2] http://lwn.net/Articles/691295/