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Re: [PATCH] x86/fpu: move FPU state into separate cache

From hpa@zytor.com
Newsgroups linux.kernel
Subject Re: [PATCH] x86/fpu: move FPU state into separate cache
Date 2017-03-30 00:50 +0200
Message-ID <tquzD-5dc-11@gated-at.bofh.it> (permalink)
References (1 earlier) <tqt0S-4cP-13@gated-at.bofh.it> <tqtaz-4hp-39@gated-at.bofh.it> <tqttU-4o9-27@gated-at.bofh.it> <tqttV-4o9-41@gated-at.bofh.it> <tqtDA-4sl-17@gated-at.bofh.it>
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On March 29, 2017 2:41:00 PM PDT, Linus Torvalds <torvalds@linux-foundation.org> wrote:
>On Wed, Mar 29, 2017 at 2:35 PM, Andy Lutomirski <luto@amacapital.net>
>wrote:
>>
>> Randomization also needs to leave thread_info at the beginning.  Can
>it do that?
>
>Good point, and good question. No idea if the gcc extension can do,
>but yes, it clearly needs a "you can't move this entry".
>
>I assume it has some such capability already, because it's fairly
>common to have that kind of "beginning of structure if fixed" due to
>unions of structures anyway.
>
>                 Linus

An alternative is to wrap the randomized structure inside a nonrandomized wrapper structure.
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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Thread

[PATCH] x86/fpu: move FPU state into separate cache Kees Cook <keescook@chromium.org> - 2017-03-29 22:50 +0200
  Re: [PATCH] x86/fpu: move FPU state into separate cache "H. Peter Anvin" <hpa@zytor.com> - 2017-03-29 23:10 +0200
    Re: [PATCH] x86/fpu: move FPU state into separate cache Kees Cook <keescook@chromium.org> - 2017-03-29 23:20 +0200
      Re: [PATCH] x86/fpu: move FPU state into separate cache Dave Hansen <dave.hansen@linux.intel.com> - 2017-03-29 23:20 +0200
      Re: [PATCH] x86/fpu: move FPU state into separate cache Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-29 23:40 +0200
        Re: [PATCH] x86/fpu: move FPU state into separate cache Andy Lutomirski <luto@amacapital.net> - 2017-03-29 23:40 +0200
          Re: [PATCH] x86/fpu: move FPU state into separate cache Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-29 23:50 +0200
            Re: [PATCH] x86/fpu: move FPU state into separate cache hpa@zytor.com - 2017-03-30 00:50 +0200
              Re: [PATCH] x86/fpu: move FPU state into separate cache Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-30 02:00 +0200
                Re: [PATCH] x86/fpu: move FPU state into separate cache Kees Cook <keescook@chromium.org> - 2017-03-30 04:00 +0200
        Re: [PATCH] x86/fpu: move FPU state into separate cache Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-29 23:40 +0200

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