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

From Dave Hansen <dave.hansen@linux.intel.com>
Newsgroups linux.kernel
Subject Re: [PATCH] x86/fpu: move FPU state into separate cache
Date 2017-03-29 23:20 +0200
Message-ID <tqtaz-4hp-43@gated-at.bofh.it> (permalink)
References <tqsHv-3Oj-9@gated-at.bofh.it> <tqt0S-4cP-13@gated-at.bofh.it> <tqtaz-4hp-39@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 03/29/2017 02:09 PM, Kees Cook wrote:
> They're adjacent already, which poses a problem for the struct layout
> randomization plugin, since adjacency may no longer be true (after
> layout randomization). This adjacency (or not) isn't really the
> problem: it's that FPU state size is only known at runtime. Another
> solution would be to have FPU state be a fixed size...

We don't want that.  It varies from a couple hundred bytes to ~3k on
newer CPUs.  We don't want to eat an extra 2.5k per task on the older
processors.

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[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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