[PATCH v1 RESEND 0/2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization

From	Baoquan He <bhe@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH v1 RESEND 0/2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization
Date	2017-03-23 04:30 +0100
Message-ID	<to1BL-4IG-9@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Now EFI region is mistakenly counted into KASLR VA space for randomization
because of misusing EFI_VA_START macro and assuming EFI_VA_START < EFI_VA_END.
In fact EFI region reserved for runtime services virtual mapping will be
allocated using a top-down schema. It will be reused by kexec/kdump kernel.

So the mistake will cause failure because vmemmap may be randomized to own
EFI region and stomped on the EFI virtual mapping. It's need be fixed.

The original post can be found in below link. And this repost just updated
patch log, no new code change. The patch 1/2 need be added to stabe kernel
after 4.8+.

https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1347835.html

Baoquan He (2):
  x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space
    for randomization
  x86/efi: Clean up a minor mistake in code comment

 arch/x86/mm/kaslr.c            | 4 ++--
 arch/x86/platform/efi/efi_64.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

-- 
2.5.5

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[PATCH v1 RESEND 0/2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization Baoquan He <bhe@redhat.com> - 2017-03-23 04:30 +0100
  [PATCH v1 RESEND 1/2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization Baoquan He <bhe@redhat.com> - 2017-03-23 04:30 +0100
    Re: [PATCH v1 RESEND 1/2] x86/mm/KASLR: EFI region is mistakenly  included into KASLR VA space for randomization Baoquan He <bhe@redhat.com> - 2017-03-24 02:00 +0100
    Re: [PATCH v1 RESEND 1/2] x86/mm/KASLR: EFI region is mistakenly  included into KASLR VA space for randomization Dave Young <dyoung@redhat.com> - 2017-03-24 03:40 +0100
      Re: [PATCH v1 RESEND 1/2] x86/mm/KASLR: EFI region is mistakenly  included into KASLR VA space for randomization Dave Young <dyoung@redhat.com> - 2017-03-24 04:40 +0100
      Re: [PATCH v1 RESEND 1/2] x86/mm/KASLR: EFI region is mistakenly  included into KASLR VA space for randomization Baoquan He <bhe@redhat.com> - 2017-03-24 05:40 +0100
  [PATCH v1 RESEND 2/2] x86/efi: Clean up a minor mistake in code comment Baoquan He <bhe@redhat.com> - 2017-03-23 04:30 +0100
    Re: [PATCH v1 RESEND 2/2] x86/efi: Clean up a minor mistake in code comment Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-03-24 10:00 +0100
      Re: [PATCH v1 RESEND 2/2] x86/efi: Clean up a minor mistake in code  comment Baoquan He <bhe@redhat.com> - 2017-03-24 10:10 +0100

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