From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Garnier <thgarnie@google.com>
Subject: Re: x86: PIE support and option to extend KASLR
	randomization
Date: Thu, 21 Sep 2017 14:16:43 -0700
Message-ID: <CAJcbSZHOuxy5BVxD0xJUdQfB-OMgbvfiP-2CJzf52K-7JZAy-A__28098.2807664715$1506028688$gmane$org@mail.gmail.com>
References: <20170815075609.mmzbfwritjzvrpsn@gmail.com>
 <CAJcbSZE+TiY2whT94WqCJNXzR=2ATOHcQ10H5RqBZA1j=k1VHQ@mail.gmail.com>
 <20170816151235.oamkdva6cwpc4cex@gmail.com>
 <CAJcbSZFM_zpL1av1JVaow8NdsGeH+6oZKeDnMPdXR0PGfynzsg@mail.gmail.com>
 <20170817080920.5ljlkktngw2cisfg@gmail.com>
 <CAJcbSZGbtc-i0X1NiBAvZA7cxpGkwSLKNB7oDNCsFxOCdhkR_g@mail.gmail.com>
 <CAJcbSZGhvwt=5ERtBHLJnwS=6AXBZLTMfrafzeUCqYy=-MKWDg@mail.gmail.com>
 <20170825080443.tvvr6wzs362cjcuu@gmail.com>
 <CAJcbSZFJQMKw21kLwr4QGoSM7DMgKRzzjWxkYBF2c1HciCzvGg@mail.gmail.com>
 <CAJcbSZH6hwaWKrvUZR33ExYaZaWKMSv4tJJA3yZkniLvLbTFMw@mail.gmail.com>
 <20170921155919.skpyt7dutod5ul4t@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta3.messagelabs.com ([195.245.230.39])
 by lists.xenproject.org with esmtp (Exim 4.84_2)
 (envelope-from <thgarnie@google.com>) id 1dv8q0-000576-4l
 for xen-devel@lists.xenproject.org; Thu, 21 Sep 2017 21:16:48 +0000
Received: by mail-it0-f52.google.com with SMTP id g18so1743465itg.5
 for <xen-devel@lists.xenproject.org>; Thu, 21 Sep 2017 14:16:46 -0700 (PDT)
In-Reply-To: <20170921155919.skpyt7dutod5ul4t@gmail.com>
List-Unsubscribe: <https://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <https://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Errors-To: xen-devel-bounces@lists.xen.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xen.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Michal Hocko <mhocko@suse.com>, kvm list <kvm@vger.kernel.org>, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, Christopher Li <sparse@chrisli.org>, Alexei Starovoitov <ast@kernel.org>, David Howells <dhowells@redhat.com>, Paul Gortmaker <paul.gortmaker@windriver.com>, Pavel Machek <pavel@ucw.cz>, "H . Peter Anvin" <hpa@zytor.com>, Kernel Hardening <kernel-hardening@lists.openwall.com>, Christoph Lameter <cl@linux.com>, Thomas Gleixner <tglx@linutronix.de>, Kees Cook <keescook@chromium.org>, the arch/x86 maintainers <x86@kernel.org>, Herbert Xu <herbert@gondor.apana.org.au>, Daniel Borkmann <daniel@iogearbox.net>, Matthew Wilcox <mawilcox@microsoft.com>, Peter Foley <pefoley2@pefoley.com>, Joerg
List-Id: xen-devel@lists.xenproject.org
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