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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 00:30 +0100
Message-ID <qHcDf-3LL-7@gated-at.bofh.it> (permalink)
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On Fri, Dec 18, 2015 at 3:16 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>
> Yes, I think.  If I'm using protection keys to protect some critical
> data structure (important stuff in shared memory, important memory
> mapped files, pmem, etc), then I'll allocate a protection key and set
> PKRU to deny writes.  The problem is that I really, really want writes
> denied except when explicitly enabled in narrow regions of code that
> use wrpkru to enable them, and I don't want an asynchronous signal
> delivered in those narrow regions of code or newly cloned threads to
> pick up the write-allow value.  So I want baseline_pkru to have the
> deny writes entry.

Hmm. Ok, that does sound like a valid and interesting usage case. Fair enough.

                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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