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Message-ID: <CAGXu5jLGFd2UY89bPm_WQvcsX+RDMg0XoJvuXwfknJrGxpn4Ng@mail.gmail.com>
Date: Fri, 1 Feb 2019 08:59:21 +1300
From: Kees Cook <keescook@...omium.org>
To: Thomas Garnier <thgarnie@...omium.org>
Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Kristen Carlson Accardi <kristen@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
X86 ML <x86@...nel.org>, Jonathan Corbet <corbet@....net>,
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Subject: Re: [PATCH v6 00/27] x86: PIE support and option to extend KASLR randomization
On Fri, Feb 1, 2019 at 8:28 AM Thomas Garnier <thgarnie@...omium.org> wrote:
> These patches make the changes necessary to build the kernel as Position
> Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below
> the top 2G of the virtual address space. It allows to optionally extend the
> KASLR randomization range from 1G to 3G. The chosen range is the one currently
> available, future changes will allow the kernel module to have a wider
> randomization range.
This also lays the groundwork for doing compilation-unit-granularity
KASLR, as Kristen has been working on. With PIE working, the
relocations are more sane and boot-time reordering becomes possible
(or at least, it becomes the same logically as doing the work on
modules, etc).
--
Kees Cook
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