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

From Ingo Molnar <mingo@kernel.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 12:00 +0100
Message-ID <tov6P-la-25@gated-at.bofh.it> (permalink)
References (3 earlier) <tot4Z-7ku-5@gated-at.bofh.it> <totHH-7Sh-13@gated-at.bofh.it> <totRo-7Xq-23@gated-at.bofh.it> <touNr-aN-9@gated-at.bofh.it> <touX7-gm-3@gated-at.bofh.it>
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* Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:

> > Turning KASLR off actively degrades that randomization of the kernel virtual 
> > addresses.
> >
> > Am I missing anything?
> >
> 
> No, I think you are right. UEFI runtime services region are likely to consist of 
> R+W+X mappings for the foreseeable future on x86, and the more we tighten down 
> security in other places, the more appealing the UEFI regions become for 
> exploitation (even if they are only mapped while runtime services calls are in 
> progress).

Ok, so I'm fine with the current proposed patch as a temporary workaround, but 
only if we are going to get a real fix as well, ASAP.

Thanks,

	Ingo

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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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