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Message-ID: <CAJcbSZFJ84+VC5xDQZGHctupdqwmMBgqzLzFRqCTBpi5t-2Gvw@mail.gmail.com>
Date: Thu, 24 May 2018 09:35:42 -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>,
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Subject: Re: [PATCH v3 09/27] x86/acpi: Adapt assembly for PIE support
On Thu, May 24, 2018 at 4:03 AM Pavel Machek <pavel@....cz> wrote:
> On Wed 2018-05-23 12:54:03, 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.
> What testing did this get?
Tested boot, hibernation and performance on qemu and dedicated machine.
> > diff --git a/arch/x86/kernel/acpi/wakeup_64.S
b/arch/x86/kernel/acpi/wakeup_64.S
> > index 50b8ed0317a3..472659c0f811 100644
> > --- a/arch/x86/kernel/acpi/wakeup_64.S
> > +++ b/arch/x86/kernel/acpi/wakeup_64.S
> > @@ -14,7 +14,7 @@
> > * Hooray, we are in Long 64-bit mode (but still running in low
memory)
> > */
> > ENTRY(wakeup_long64)
> > - movq saved_magic, %rax
> > + movq saved_magic(%rip), %rax
> > movq $0x123456789abcdef0, %rdx
> > cmpq %rdx, %rax
> > jne bogus_64_magic
> Because, as comment says, this is rather tricky code.
I agree, I think maintainers feedback is very important for this patchset.
Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
Thomas
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