Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1442131

Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls
Date 2016-07-13 10:00 +0200
Message-ID <rUnfj-8tL-1@gated-at.bofh.it> (permalink)
References (5 earlier) <rTB0Z-27J-1@gated-at.bofh.it> <rTKxl-8gc-41@gated-at.bofh.it> <rTKH0-8jQ-15@gated-at.bofh.it> <rTLD4-xi-21@gated-at.bofh.it> <rU8T0-7sL-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

* Andy Lutomirski <luto@amacapital.net> wrote:

> > If we push a PKRU value into a thread between the rdpkru() and wrpkru(), we'll 
> > lose the content of that "push".  I'm not sure there's any way to guarantee 
> > this with a user-controlled register.
> 
> We could try to insist that user code uses some vsyscall helper that tracks 
> which bits are as-yet-unassigned.  That's quite messy, though.

Actually, if we turned the vDSO into something more like a minimal user-space 
library with the ability to run at process startup as well to prepare stuff then 
it's painful to get right only *once*, and there will be tons of other areas where 
a proper per thread data storage on the user-space side would be immensely useful!

Thanks,

	Ingo

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Andy Lutomirski <luto@amacapital.net> - 2016-07-11 06:30 +0200
  Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Ingo Molnar <mingo@kernel.org> - 2016-07-11 09:40 +0200
    Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen <dave@sr71.net> - 2016-07-11 16:30 +0200
      Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Ingo Molnar <mingo@kernel.org> - 2016-07-12 09:20 +0200
        Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen <dave@sr71.net> - 2016-07-12 17:40 +0200
    Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Andy Lutomirski <luto@amacapital.net> - 2016-07-11 17:00 +0200
  Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen <dave@sr71.net> - 2016-07-11 16:40 +0200
    Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Andy Lutomirski <luto@amacapital.net> - 2016-07-11 16:50 +0200
      Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen <dave.hansen@intel.com> - 2016-07-11 17:50 +0200
        Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Andy Lutomirski <luto@amacapital.net> - 2016-07-12 18:40 +0200
          Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen <dave.hansen@intel.com> - 2016-07-12 19:20 +0200
            Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Andy Lutomirski <luto@amacapital.net> - 2016-07-13 01:00 +0200
          Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Ingo Molnar <mingo@kernel.org> - 2016-07-13 10:00 +0200
            Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Andy Lutomirski <luto@amacapital.net> - 2016-07-13 20:50 +0200
              Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Ingo Molnar <mingo@kernel.org> - 2016-07-14 10:10 +0200
                Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Andy Lutomirski <luto@amacapital.net> - 2016-07-18 06:50 +0200
                Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Ingo Molnar <mingo@kernel.org> - 2016-07-18 12:00 +0200

csiph-web