linux-kernel - Re: [PATCH v2] x86, mm: set NX across entire PMD at boot

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Message-ID: <CAE9FiQUQEnXA-vX2L3VhSucNbRf3u8Afmn=M0CoXHeUyPhuAOA@mail.gmail.com>
Date:	Sun, 16 Nov 2014 19:26:25 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Wang Nan <wangnan0@...wei.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH v2] x86, mm: set NX across entire PMD at boot

On Sun, Nov 16, 2014 at 10:52 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> >
>> > Are you sure? For me, _brk_end isn't far enough:
>> >
>> > [    1.475572] all_end: 0xffffffff82df5000
>> > [    1.476736] _brk_end: 0xffffffff82dd6000
>>
>> Yes. _brk_end should be small then &_end.
>
> Wrong. _brk_end can move up to _end, i.e. to __brk_limit.

Confused. What is wrong? _brk_end is not smaller than &_end?

Yinghai
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