linux-kernel - Re: [PATCH v10 17/17] kasan: enable instrumentation of global variables

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Date:	Sat, 31 Jan 2015 03:18:04 +0400
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Michal Marek <mmarek@...e.cz>,
	"open list:KERNEL BUILD + fi..." <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v10 17/17] kasan: enable instrumentation of global variables

2015-01-31 0:45 GMT+03:00 Andrew Morton <akpm@...ux-foundation.org>:
> On Fri, 30 Jan 2015 20:47:13 +0300 Andrey Ryabinin <a.ryabinin@...sung.com> wrote:
>
>> >> +struct kasan_global {
>> >> +  const void *beg;                /* Address of the beginning of the global variable. */
>> >> +  size_t size;                    /* Size of the global variable. */
>> >> +  size_t size_with_redzone;       /* Size of the variable + size of the red zone. 32 bytes aligned */
>> >> +  const void *name;
>> >> +  const void *module_name;        /* Name of the module where the global variable is declared. */
>> >> +  unsigned long has_dynamic_init; /* This needed for C++ */
>> >
>> > This can be removed?
>> >
>>
>> No, compiler dictates layout of this struct. That probably deserves a comment.
>
> I see.  A link to the relevant gcc doc would be good.
>

There is no doc, only gcc source code.

> Perhaps the compiler provides a header file so clients of this feature
> don't need to write their own?
>

Nope.
Actually, we are the only client of this feature outside gcc code.
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