Re: Minor PKRU bug?

From	Dave Hansen <dave.hansen@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: Minor PKRU bug?
Date	2016-07-12 17:40 +0200
Message-ID	<rU7WW-6Ps-33@gated-at.bofh.it> (permalink)
References	<rT7YZ-8fP-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 07/09/2016 02:27 PM, Andy Lutomirski wrote:
> is_prefetch in arch/x86/mm/fault.c can be called on a user address
> that's not readable due to PKRU.  This could break it.  You might need
> to add a get_user_exec or similar.

Thanks for the heads-up.  I think I'll just need a version that does
something along the lines of stac/clac, but with PKRU.

I think I can do it with an "_exec" variant of probe_kernel_address(),
but it's a bit messy.

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Re: Minor PKRU bug? Dave Hansen <dave.hansen@linux.intel.com> - 2016-07-12 17:40 +0200
  Re: Minor PKRU bug? "H. Peter Anvin" <hpa@zytor.com> - 2016-07-13 01:00 +0200
    Re: Minor PKRU bug? Dave Hansen <dave.hansen@linux.intel.com> - 2016-07-13 01:10 +0200
    Re: Minor PKRU bug? Andy Lutomirski <luto@amacapital.net> - 2016-07-13 01:10 +0200
      Re: Minor PKRU bug? Dave Hansen <dave.hansen@linux.intel.com> - 2016-07-21 23:40 +0200
        Re: Minor PKRU bug? Andy Lutomirski <luto@amacapital.net> - 2016-07-21 23:50 +0200
          Re: Minor PKRU bug? "H. Peter Anvin" <hpa@zytor.com> - 2016-07-22 00:00 +0200
            Re: Minor PKRU bug? Dave Hansen <dave.hansen@linux.intel.com> - 2016-07-22 00:30 +0200

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