linux-kernel - Re: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO)

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Message-ID: <9ca0ef74-b409-2eae-07f8-9fd7d83989a5@intel.com>
Date:   Wed, 20 Sep 2017 17:28:11 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Tycho Andersen <tycho@...ker.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, kernel-hardening@...ts.openwall.com,
        Marco Benatto <marco.antonio.780@...il.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>, x86@...nel.org
Subject: Re: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame
 Ownership (XPFO)

At a high level, does this approach keep an attacker from being able to
determine the address of data in the linear map, or does it keep them
from being able to *exploit* it?  Can you have a ret2dir attack if the
attacker doesn't know the address, for instance?