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Date: Wed, 16 Aug 2017 12:26:36 -0400
From: Daniel Micay <danielmicay@...il.com>
To: Ingo Molnar <mingo@...nel.org>, 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
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<hjl.tools@...il.com>, Paul Bolle <pebolle@...cali.nl>, Rob Landley
<rob@...dley.net>, Baoquan He <bhe@...hat.com>, the arch/x86 maintainers
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Hardening <kernel-hardening@...ts.openwall.com>, Linus Torvalds
<torvalds@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Borislav Petkov <bp@...en8.de>
Subject: Re: x86: PIE support and option to extend KASLR randomization
> How are these assumptions hardcoded by GCC? Most of the instructions
> should be
> relocatable straight away, as most call/jump/branch instructions are
> RIP-relative.
>
> I.e. is there no GCC code generation mode where code can be placed
> anywhere in the
> canonical address space, yet call and jump distance is within 31 bits
> so that the
> generated code is fast?
That's what PIE is meant to do. However, not disabling support for lazy
linking (-fno-plt) / symbol interposition (-Bsymbolic) is going to cause
it to add needless overhead.
arm64 is using -pie -shared -Bsymbolic in arch/arm64/Makefile for their
CONFIG_RELOCATABLE option. See 08cc55b2afd97a654f71b3bebf8bb0ec89fdc498.
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