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Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit?

From Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit?
Date 2015-12-19 00:10 +0100
Message-ID <qHcjU-3Fb-17@gated-at.bofh.it> (permalink)
References (11 earlier) <qHa8q-23k-23@gated-at.bofh.it> <qHarL-2rz-17@gated-at.bofh.it> <qHaBs-2uN-3@gated-at.bofh.it> <qHb4t-2GQ-5@gated-at.bofh.it> <qHbHb-3aG-3@gated-at.bofh.it>
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On Fri, Dec 18, 2015 at 2:28 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>
> Apps that don't want to use the baseline_pkru mechanism could use
> syscalls to claim ownership of protection keys but then manage them
> purely with WRPKRU directly.  We could optionally disallow
> mprotect_key on keys that weren't allocated in advance.
>
> Does that seem sane?

So everything seems sane except for the need for that baseline_pkru.

I'm not seeing why it couldn't just be a fixed value. Is there any
real downside to it?

                    Linus
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Thread

Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@kernel.org> - 2015-12-18 02:50 +0100
  Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-18 03:20 +0100
    Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 03:40 +0100
      Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-18 04:00 +0100
        Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 06:30 +0100
          Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? "H. Peter Anvin" <hpa@zytor.com> - 2015-12-18 07:50 +0100
            Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 17:10 +0100
              Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-18 18:00 +0100
              Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-18 19:50 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 20:30 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-18 21:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 21:30 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Linus Torvalds <torvalds@linux-foundation.org> - 2015-12-18 21:40 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 21:50 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? "H. Peter Anvin" <hpa@zytor.com> - 2015-12-18 22:00 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 22:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-18 22:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Linus Torvalds <torvalds@linux-foundation.org> - 2015-12-18 22:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-18 22:20 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Linus Torvalds <torvalds@linux-foundation.org> - 2015-12-18 22:50 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-18 23:30 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Linus Torvalds <torvalds@linux-foundation.org> - 2015-12-19 00:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-19 00:20 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Linus Torvalds <torvalds@linux-foundation.org> - 2015-12-19 00:30 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-21 18:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-22 00:00 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-22 00:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-22 00:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-22 00:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-22 00:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski <luto@amacapital.net> - 2015-12-22 00:10 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Dave Hansen <dave.hansen@linux.intel.com> - 2015-12-30 00:50 +0100
                Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Linus Torvalds <torvalds@linux-foundation.org> - 2015-12-18 22:20 +0100
          Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Ingo Molnar <mingo@kernel.org> - 2015-12-18 09:40 +0100
  Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Christoph Hellwig <hch@infradead.org> - 2015-12-18 10:00 +0100
    Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Borislav Petkov <bp@alien8.de> - 2015-12-18 14:00 +0100

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