All of lore.kernel.org
 help / color / mirror / Atom feed
From: Dave Hansen <dave.hansen@linux.intel.com>
To: Andy Lutomirski <luto@amacapital.net>, X86 ML <x86@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Minor PKRU bug?
Date: Tue, 12 Jul 2016 08:32:26 -0700	[thread overview]
Message-ID: <57850D8A.9090801@linux.intel.com> (raw)
In-Reply-To: <CALCETrVUZAo2=ZK8EZxjHDGiUj=XU_d-=L9SSDYU+F75CZiLsA@mail.gmail.com>

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.

  reply	other threads:[~2016-07-12 15:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-09 21:27 Minor PKRU bug? Andy Lutomirski
2016-07-12 15:32 ` Dave Hansen [this message]
2016-07-12 22:55   ` H. Peter Anvin
2016-07-12 22:59     ` Dave Hansen
2016-07-12 22:59     ` Andy Lutomirski
2016-07-21 21:35       ` Dave Hansen
2016-07-21 21:45         ` Andy Lutomirski
2016-07-21 21:48           ` H. Peter Anvin
2016-07-21 22:26             ` Dave Hansen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=57850D8A.9090801@linux.intel.com \
    --to=dave.hansen@linux.intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@amacapital.net \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.