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Date: Fri, 11 Aug 2017 08:09:41 -0700
From: Thomas Garnier <thgarnie@...gle.com>
To: Pavel Machek <pavel@....cz>
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>, 
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	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, 
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	linux-arch <linux-arch@...r.kernel.org>, linux-sparse@...r.kernel.org, 
	Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [RFC v2 13/23] x86/power/64: Adapt assembly for PIE support

On Fri, Aug 11, 2017 at 5:36 AM, Pavel Machek <pavel@....cz> wrote:
> On Thu 2017-08-10 10:26:05, Thomas Garnier wrote:
>> Change the assembly code to use only relative references of symbols for the
>> kernel to be PIE compatible.
>>
>> Position Independent Executable (PIE) support will allow to extended the
>> KASLR randomization range below the -2G memory limit.
>>
>> Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
>
> Acked-by: Pavel Machek <pavel@....cz>

Thanks Pavel!

>
>> --- a/arch/x86/power/hibernate_asm_64.S
>> +++ b/arch/x86/power/hibernate_asm_64.S
>> @@ -24,7 +24,7 @@
>>  #include <asm/frame.h>
>>
>>  ENTRY(swsusp_arch_suspend)
>> -     movq    $saved_context, %rax
>> +     leaq    saved_context(%rip), %rax
>>       movq    %rsp, pt_regs_sp(%rax)
>>       movq    %rbp, pt_regs_bp(%rax)
>>       movq    %rsi, pt_regs_si(%rax)
>> @@ -115,7 +115,7 @@ ENTRY(restore_registers)
>>       movq    %rax, %cr4;  # turn PGE back on
>>
>>       /* We don't restore %rax, it must be 0 anyway */
>> -     movq    $saved_context, %rax
>> +     leaq    saved_context(%rip), %rax
>>       movq    pt_regs_sp(%rax), %rsp
>>       movq    pt_regs_bp(%rax), %rbp
>>       movq    pt_regs_si(%rax), %rsi
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html



-- 
Thomas

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