linux-kernel - [PATCH 0/3] PTI for x86-32 Fixes

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Date:   Tue,  7 Aug 2018 12:24:28 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>, aliguori@...zon.com,
        daniel.gruss@...k.tugraz.at, hughd@...gle.com, keescook@...gle.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>,
        "David H . Gutteridge" <dhgutteridge@...patico.ca>,
        jroedel@...e.de, joro@...tes.org
Subject: [PATCH 0/3] PTI for x86-32 Fixes

Hi,

here is a small patch-set to fix two small issues in the
PTI implementation for 32 bit x86. The issues are:

	1) Fix the 32 bit PCID check. I used the wrong
	   operator there and this caused false-positive
	   warnings.

	2) The other two patches make sure the init-hole is
	   not mapped into the user page-table. It is the
	   32 bit counterpart to commit

	   c40a56a7818c ('x86/mm/init: Remove freed kernel image areas from alias mapping')

	   for the 64 bit PTI implementation.

I tested that no-PAE, PAE and 64 bit kernel all boot and
have correct user page-tables with identical global mappings
between user and kernel.

Regards,

	Joerg

Joerg Roedel (3):
  x86/mm/pti: Fix 32 bit PCID check
  x86/mm/pti: Don't clear permissions in pti_clone_pmd()
  x86/mm/pti: Clone kernel-image on PTE level for 32 bit

 arch/x86/mm/pti.c | 143 ++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 100 insertions(+), 43 deletions(-)

-- 
2.7.4