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Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization

From Ard Biesheuvel <ard.biesheuvel@linaro.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization
Date 2017-03-24 10:50 +0100
Message-ID <tou14-80L-9@gated-at.bofh.it> (permalink)
References (2 earlier) <tosVj-7gO-1@gated-at.bofh.it> <tot4Z-7ku-5@gated-at.bofh.it> <totHH-7Sh-13@gated-at.bofh.it> <totRo-7Xq-23@gated-at.bofh.it> <tou13-80L-7@gated-at.bofh.it>
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On 24 March 2017 at 09:40, Borislav Petkov <bp@alien8.de> wrote:
> On Fri, Mar 24, 2017 at 09:37:36AM +0000, Ard Biesheuvel wrote:
>> No. It is the firmware's EFI code, and the virtual translation applied
>> by the OS is made known to the firmware by means of a call into the
>> runtime service SetVirtualAddressMap().
>
> We can still randomize within those 64G before calling
> SetVirtualAddressMap(). The question is, do we want to or need to, even?
>

That is a different matter. If the regions are only mapped while
runtime services invocations are in progress (as we do on ARM), I am
not sure if it matters that much, given how rarely that occurs in
normal use.

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[PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into KASLR VA space for randomization Baoquan He <bhe@redhat.com> - 2017-03-24 06:10 +0100
  [tip:x86/urgent] x86/mm/KASLR: Exclude EFI region from KASLR VA  space randomization tip-bot for Baoquan He <tipbot@zytor.com> - 2017-03-24 09:20 +0100
  Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ingo Molnar <mingo@kernel.org> - 2017-03-24 09:20 +0100
    Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Baoquan He <bhe@redhat.com> - 2017-03-24 09:40 +0100
      Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Dave Young <dyoung@redhat.com> - 2017-03-24 09:50 +0100
        Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ingo Molnar <mingo@kernel.org> - 2017-03-24 10:30 +0100
          Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Borislav Petkov <bp@alien8.de> - 2017-03-24 10:40 +0100
          Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-03-24 10:40 +0100
            Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Borislav Petkov <bp@alien8.de> - 2017-03-24 10:50 +0100
              Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-03-24 11:00 +0100
            Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Borislav Petkov <bp@alien8.de> - 2017-03-24 10:50 +0100
              Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-03-24 10:50 +0100
            Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ingo Molnar <mingo@kernel.org> - 2017-03-24 11:40 +0100
              Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-03-24 11:50 +0100
                Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Ingo Molnar <mingo@kernel.org> - 2017-03-24 12:00 +0100
          Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Baoquan He <bhe@redhat.com> - 2017-03-24 13:00 +0100
    Re: [PATCH v2] x86/mm/KASLR: EFI region is mistakenly included into  KASLR VA space for randomization Dave Young <dyoung@redhat.com> - 2017-03-24 10:00 +0100

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