linux-kernel - Re: [PATCH] x86/ldt: Fix support_pte_mask filtering in map_ldt

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Date:   Thu, 19 Apr 2018 15:00:11 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Andy Lutomirski <luto@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <jroedel@...e.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH] x86/ldt: Fix support_pte_mask filtering in
 map_ldt_struct()

On Wed, Apr 18, 2018 at 02:18:57PM +0200, Borislav Petkov wrote:
> Btw, even with Jörg's fix,
> 
> fb43d6cb91ef ("x86/mm: Do not auto-massage page protections")

Some updates.

1. current linus master with Joerg's fix triple-faults on the IVB laptop
during resume from disk.

2. current linus master with Joerg's fix + those two:

C Apr 17               Dave Hansen ( :  67) [PATCH 1/2] x86, pti: fix boot problems from Global-bit setting
C Apr 17               Dave Hansen ( :  81) └─>[PATCH 2/2] x86, pti: fix boot warning from Global-bit setting

triplefaults too.

Bisection confirms again fb43d6cb91ef is the first bad:

fb43d6cb91ef x86/mm: Do not auto-massage page protections <--- NOT OK
6baf4bec02db x86/espfix: Document use of _PAGE_GLOBAL   <--- OK

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--