linux-kernel - Re: [PATCH 1/2] x86: consider effective protection attributes in W+X check

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Date:   Tue, 12 Dec 2017 11:36:40 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Jan Beulich <JBeulich@...e.com>
Cc:     mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
        xen-devel <xen-devel@...ts.xenproject.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>, sds@...ho.nsa.gov,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86: consider effective protection attributes in W+X
 check


* Jan Beulich <JBeulich@...e.com> wrote:

> Using just the leaf page table entry flags would cause a false warning
> in case _PAGE_RW is clear or _PAGE_NX is set in a higher level entry.

Good find - I assume this bug can cause both false positives and false negatives 
as well, right?

Thanks,

	Ingo