linux-kernel - Re: [PATCH 3/3 V13] RO/NX protection for loadable kernel

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Message-ID: <20110110234959.GE4979@outflux.net>
Date:	Mon, 10 Jan 2011 15:49:59 -0800
From:	Kees Cook <kees.cook@...onical.com>
To:	matthieu castet <castet.matthieu@...e.fr>
Cc:	Ingo Molnar <mingo@...e.hu>, Xiaotian Feng <xtfeng@...il.com>,
	Valdis.Kletnieks@...edu, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-next@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@....de>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Dave Jones <davej@...hat.com>,
	Siarhei Liakh <sliakh.lkml@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 3/3 V13] RO/NX protection for loadable kernel

Hi,

I was just shown this[1] on Xen from an Ubuntu bug report[2].

[    1.230382] NX-protecting the kernel data: 3884k
[    1.231002] BUG: unable to handle kernel paging request at c1782ae0
...
[    1.231145] Call Trace:
[    1.231152]  [<c0138481>] ? __change_page_attr+0x2c1/0x370
[    1.231161]  [<c02163a1>] ? __purge_vmap_area_lazy+0xc1/0x180
[    1.231169]  [<c013857c>] ? __change_page_attr_set_clr+0x4c/0xb0
[    1.231176]  [<c0138838>] ? change_page_attr_set_clr+0x128/0x300
[    1.231183]  [<c010798e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
[    1.231192]  [<c0159ca1>] ? vprintk+0x171/0x3f0
[    1.231198]  [<c0138bdf>] ? set_memory_nx+0x5f/0x70


Does Xen have different size page table allocations or something weird?

-Kees

[1] http://launchpadlibrarian.net/61853131/natty-failed-boot-ec2.txt
[2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/699828

-- 
Kees Cook
Ubuntu Security Team
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