Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time

From	Ingo Molnar <mingo@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time
Date	2016-05-10 08:00 +0200
Message-ID	<rx8S5-4qk-9@gated-at.bofh.it> (permalink)
References	<rwZYt-4gl-5@gated-at.bofh.it> <rwZYv-4gl-47@gated-at.bofh.it> <rx1xh-6ah-39@gated-at.bofh.it> <rx1QD-6kP-33@gated-at.bofh.it> <rx1QD-6kP-35@gated-at.bofh.it>
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* Yinghai Lu <yinghai@kernel.org> wrote:

> On Mon, May 9, 2016 at 3:23 PM, Kees Cook <keescook@chromium.org> wrote:
> >> The exact reason to have assigning in functions.
> >>
> >> pgt_data address could be changed during kernel relocation.
> >> so can not assigned during compiling time.
> >
> > Ah-ha, that explains why I had to keep it on the stack. Thanks for the
> > clarification!
> 
> My fault, I should put that comment in the code at first place.

Ok, could you guys please update the code and the changelog as well, and also 
rename that horribly named prepare_level4() function?

Also, since this code is multi-author, it would be nice to add explicit copyright 
notices to the new arch/x86/boot/compressed/pagetable.c file, it was originally 
written by you, then modified by Kees. Something like:

/*
 * Copyright (C) 2015-2016  Yinghai Lu
 * Copyright (C)      2016  Kees Cook
 */

Thanks,

	Ingo

Thread

[PATCH v7 0/9] x86/KASLR: Randomize virtual address separately Kees Cook <keescook@chromium.org> - 2016-05-09 22:30 +0200
  [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Kees Cook <keescook@chromium.org> - 2016-05-09 22:30 +0200
    Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Yinghai Lu <yinghai@kernel.org> - 2016-05-10 00:10 +0200
      Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Yinghai Lu <yinghai@kernel.org> - 2016-05-10 00:30 +0200
      Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Kees Cook <keescook@chromium.org> - 2016-05-10 00:30 +0200
        Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Yinghai Lu <yinghai@kernel.org> - 2016-05-10 00:30 +0200
          Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Ingo Molnar <mingo@kernel.org> - 2016-05-10 08:00 +0200
            Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Borislav Petkov <bp@suse.de> - 2016-05-10 13:30 +0200
      Re: [PATCH v7 1/9] x86/KASLR: Initialize mapping_info every time Yinghai Lu <yinghai@kernel.org> - 2016-05-10 00:30 +0200
    [tip:x86/boot] x86/KASLR: Initialize mapping_info every time tip-bot for Kees Cook <tipbot@zytor.com> - 2016-05-10 10:50 +0200
  [PATCH v7 8/9] x86/KASLR: Add physical address randomization >4G Kees Cook <keescook@chromium.org> - 2016-05-09 22:30 +0200
  [PATCH v7 2/9] x86/boot: Add missing file header comments Kees Cook <keescook@chromium.org> - 2016-05-09 22:30 +0200
    [tip:x86/boot] x86/boot: Add missing file header comments tip-bot for Kees Cook <tipbot@zytor.com> - 2016-05-10 10:50 +0200

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