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Message-ID: <20170925073342.2yoghmanhx6c75ho@gmail.com>
Date: Mon, 25 Sep 2017 09:33:42 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Pavel Machek <pavel@....cz>
Cc: "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>,
Thomas Garnier <thgarnie@...gle.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Josh Poimboeuf <jpoimboe@...hat.com>, Arnd Bergmann <arnd@...db.de>,
Matthias Kaehlcke <mka@...omium.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Juergen Gross <jgross@...e.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Joerg Roedel <joro@...tes.org>,
Tom Lendacky <thomas.lendacky@....com>,
Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>,
Brian Gerst <brgerst@...il.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>, Tejun Heo <tj@...nel.org>,
Christoph Lameter <cl@...ux.com>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Chris Metcalf <cmetcalf@...lanox.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
Nicolas Pitre <nicolas.pitre@...aro.org>,
Christopher Li <sparse@...isli.org>,
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Lukas Wunner <lukas@...ner.de>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Dou Liyang <douly.fnst@...fujitsu.com>,
Daniel Borkmann <daniel@...earbox.net>,
Alexei Starovoitov <ast@...nel.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Markus Trippelsdorf <markus@...ppelsdorf.de>,
Steven Rostedt <rostedt@...dmis.org>,
Kees Cook <keescook@...omium.org>, Rik van Riel <riel@...hat.com>,
David Howells <dhowells@...hat.com>,
Waiman Long <longman@...hat.com>, Kyle Huey <me@...ehuey.com>,
Peter Foley <pefoley2@...oley.com>,
Tim Chen <tim.c.chen@...ux.intel.com>,
Catalin Marinas <catalin.marinas@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Michal Hocko <mhocko@...e.com>,
Matthew Wilcox <mawilcox@...rosoft.com>,
"H . J . Lu" <hjl.tools@...il.com>, Paul Bolle <pebolle@...cali.nl>,
Rob Landley <rob@...dley.net>, Baoquan He <bhe@...hat.com>,
Daniel Micay <danielmicay@...il.com>,
the arch/x86 maintainers <x86@...nel.org>,
linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
xen-devel@...ts.xenproject.org, kvm list <kvm@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>,
linux-arch <linux-arch@...r.kernel.org>,
linux-sparse@...r.kernel.org,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Borislav Petkov <bp@...en8.de>
Subject: Re: x86: PIE support and option to extend KASLR randomization
* Pavel Machek <pavel@....cz> wrote:
> > For example, there would be collision with regular user-space mappings, right?
> > Can local unprivileged users use mmap(MAP_FIXED) probing to figure out where
> > the kernel lives?
>
> Local unpriviledged users can probably get your secret bits using cache probing
> and jump prediction buffers.
>
> Yes, you don't want to leak the information using mmap(MAP_FIXED), but CPU will
> leak it for you, anyway.
Depends on the CPU I think, and CPU vendors are busy trying to mitigate this
angle.
Thanks,
Ingo
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