linux-kernel - Re: [PATCH v2 2/2] x86/process: Silence KASAN warnings in get

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Message-ID: <20151013141946.GA10135@gmail.com>
Date:	Tue, 13 Oct 2015 16:19:46 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	kasan-dev <kasan-dev@...glegroups.com>,
	Borislav Petkov <bp@...en8.de>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Wolfram Gloger <wmglo@...t.med.uni-muenchen.de>
Subject: Re: [PATCH v2 2/2] x86/process: Silence KASAN warnings in get_wchan()


* Dmitry Vyukov <dvyukov@...gle.com> wrote:

> > Hm, exactly how is the 'red zone' defined? Is this about the current task 
> > mostly, or when doing get_wchan() on other tasks?
> 
> When code is compiled with AddressSanitizer, most variables on stack have 
> redzones around them, on entry function "poisons" these redzones (any accesses 
> to them will be flagged), on exit function "unpoisons" these redzones.

I see, fair enough!

This series looks good to me, modulo the small documentation nit I had about the 
first patch.

Thanks,

	Ingo
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