From: Dave Hansen <dave.hansen@intel.com>
To: Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Juergen Gross <jgross@suse.com>,
Peter Zijlstra <peterz@infradead.org>,
Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Brian Gerst <brgerst@gmail.com>,
David Laight <David.Laight@aculab.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Eduardo Valentin <eduval@amazon.com>,
Greg KH <gregkh@linuxfoundation.org>,
Will Deacon <will.deacon@arm.com>,
aliguori@amazon.com, daniel.gruss@iaik.tugraz.at,
hughd@google.com, keescook@google.com,
Andrea Arcangeli <aarcange@redhat.com>,
Waiman Long <llong@redhat.com>, Pavel Machek <pavel@ucw.cz>,
"David H . Gutteridge" <dhgutteridge@sympatico.ca>,
jroedel@suse.de
Subject: Re: [PATCH] x86/mm/pti: Move user W+X check into pti_finalize()
Date: Wed, 8 Aug 2018 08:54:37 -0700 [thread overview]
Message-ID: <aee38579-3a53-3370-b22b-04603b6b65ce@intel.com> (raw)
In-Reply-To: <1533727000-9172-1-git-send-email-joro@8bytes.org>
On 08/08/2018 04:16 AM, Joerg Roedel wrote:
> But with CONFIG_DEBUG_WX enabled, the user page-table is
> already checked in mark_readonly() for insecure mappings.
> This causes false-positive warnings, because the user
> page-table did not get the updated mappings yet.
One bit of information missing from the changelog: Could you clarify how
there are any entries in the user page tables for the code to complain?
Before pti_init(), I would have expected the user page tables to be empty.
That causes a different problem, but it would not have resulted in
warnings, so I think I'm missing something.
next prev parent reply other threads:[~2018-08-08 15:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-08 11:16 Joerg Roedel
2018-08-08 15:54 ` Dave Hansen [this message]
2018-08-09 11:16 ` Joerg Roedel
2018-08-08 20:33 ` Kees Cook
2018-08-09 11:26 ` Joerg Roedel
2018-08-17 2:42 ` David H. Gutteridge
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=aee38579-3a53-3370-b22b-04603b6b65ce@intel.com \
--to=dave.hansen@intel.com \
--cc=David.Laight@aculab.com \
--cc=aarcange@redhat.com \
--cc=aliguori@amazon.com \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=brgerst@gmail.com \
--cc=daniel.gruss@iaik.tugraz.at \
--cc=dhgutteridge@sympatico.ca \
--cc=dvlasenk@redhat.com \
--cc=eduval@amazon.com \
--cc=gregkh@linuxfoundation.org \
--cc=hpa@zytor.com \
--cc=hughd@google.com \
--cc=jgross@suse.com \
--cc=jkosina@suse.cz \
--cc=joro@8bytes.org \
--cc=jpoimboe@redhat.com \
--cc=jroedel@suse.de \
--cc=keescook@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=llong@redhat.com \
--cc=luto@kernel.org \
--cc=mingo@kernel.org \
--cc=pavel@ucw.cz \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=will.deacon@arm.com \
--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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox