linux-kernel - Re: [PATCH 1/6] x86: fix NX bit handling in change_page

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20080125103256.GR23708@elte.hu>
Date:	Fri, 25 Jan 2008 11:32:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] x86: fix NX bit handling in change_page_attr


* Ingo Molnar <mingo@...e.hu> wrote:

> ...
> +       ref_prot = pte_pgprot(pte_mkexec(pte_clrhuge(*kpte)));
> 
> i.e. it now goes through all the proper accessors.

i guess it would be nicer to have the proper accessors to just clear the 
NX bit from ref-prot - instead of re-constructing the *kpte from 
scratch. But i see no other way to do it right now than to access 
pgprot_val() as an lvalue. Jeremy, what would be the best approach here?

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/