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Message-ID: <20170811124127.kkb5pnkljz4umxuj@gmail.com>
Date: Fri, 11 Aug 2017 14:41:27 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
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>,
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Brian Gerst <brgerst@...il.com>,
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Daniel Micay <danielmicay@...il.com>, x86@...nel.org,
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Linus Torvalds <torvalds@...ux-foundation.org>,
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Borislav Petkov <bp@...en8.de>
Subject: Re: x86: PIE support and option to extend KASLR randomization
* Thomas Garnier <thgarnie@...gle.com> wrote:
> Changes:
> - v2:
> - Add support for global stack cookie while compiler default to fs without
> mcmodel=kernel
> - Change patch 7 to correctly jump out of the identity mapping on kexec load
> preserve.
>
> 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.
So this:
61 files changed, 923 insertions(+), 299 deletions(-)
... is IMHO an _awful_ lot of churn and extra complexity in pretty fragile pieces
of code, to gain what appears to be only ~1.5 more bits of randomization!
Do these changes get us closer to being able to build the kernel as truly position
independent, i.e. to place it anywhere in the valid x86-64 address space? Or any
other advantages?
Thanks,
Ingo
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