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Groups > linux.kernel > #1252814
| From | Borislav Petkov <bp@alien8.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2] x86/mm: warn on W+x mappings |
| Date | 2015-10-21 15:30 +0200 |
| Message-ID | <qm1CP-4fn-41@gated-at.bofh.it> (permalink) |
| References | (5 earlier) <qjw0q-2n4-31@gated-at.bofh.it> <qjBta-20C-55@gated-at.bofh.it> <qlYbU-7xO-7@gated-at.bofh.it> <qm106-3fX-15@gated-at.bofh.it> <qm19L-3rA-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Oct 21, 2015 at 02:57:47PM +0200, Ard Biesheuvel wrote:
> ... For the remaining cases, which is the vast majority, no such
> assumptions can be made, and since the UEFI runtime regions are
> typically populated with a bunch of PE/COFF images (each of which
> consists of text + data), inferring where the boundaries are between
> them does not seem tractable (for instance, to only map 'boundary'
> pages RWX)
How much of a problem would it be if we still do the on-demand page
faulting and map a trailing piece of code together with the data in a
page RWX?
Still better than mapping the *whole* thing RWX, no?
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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Re: [PATCH v2] x86/mm: warn on W+x mappings Ingo Molnar <mingo@kernel.org> - 2015-10-21 11:50 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Ingo Molnar <mingo@kernel.org> - 2015-10-21 14:50 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-10-21 15:00 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Borislav Petkov <bp@alien8.de> - 2015-10-21 15:30 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-10-21 15:30 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Borislav Petkov <bp@alien8.de> - 2015-10-21 16:40 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Andy Lutomirski <luto@amacapital.net> - 2015-10-21 20:50 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Andy Lutomirski <luto@amacapital.net> - 2015-10-21 22:50 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Matt Fleming <matt@codeblueprint.co.uk> - 2015-10-21 22:50 +0200
Re: [PATCH v2] x86/mm: warn on W+x mappings Matt Fleming <matt@codeblueprint.co.uk> - 2015-10-21 22:40 +0200
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