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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20171212103640.qcpyj7wxuimfkvjp@gmail.com>
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