From: Kees Cook <kees.cook@canonical.com>
To: mingo@redhat.com, hpa@zytor.com, sliakh.lkml@gmail.com,
jmorris@namei.org, linux-kernel@vger.kernel.org,
rusty@rustcorp.com.au, torvalds@linux-foundation.org, ak@muc.de,
davej@redhat.com, jiang@cs.ncsu.edu, arjan@infradead.org,
castet.matthieu@free.fr, tglx@linutronix.de,
sfr@canb.auug.org.au, mingo@elte.hu,
Stefan Bader <stefan.bader@canonical.com>
Subject: Re: [tip:x86/security] x86: Add NX protection for kernel data
Date: Tue, 11 Jan 2011 15:31:35 -0800 [thread overview]
Message-ID: <20110111233135.GL4979@outflux.net> (raw)
In-Reply-To: <tip-5bd5a452662bc37c54fb6828db1a3faf87e6511c@git.kernel.org>
On Thu, Nov 18, 2010 at 02:08:22PM +0000, tip-bot for Matthieu Castet wrote:
> Commit-ID: 5bd5a452662bc37c54fb6828db1a3faf87e6511c
> Gitweb: http://git.kernel.org/tip/5bd5a452662bc37c54fb6828db1a3faf87e6511c
> Author: Matthieu Castet <castet.matthieu@free.fr>
> AuthorDate: Tue, 16 Nov 2010 22:31:26 +0100
> Committer: Ingo Molnar <mingo@elte.hu>
> CommitDate: Thu, 18 Nov 2010 12:52:04 +0100
>
> x86: Add NX protection for kernel data
[I'd sent this in reply to the wrong patch before, resending now...]
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
next prev parent reply other threads:[~2011-01-11 23:32 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-16 21:31 [PATCH 2/3 V8] NX protection for kernel data matthieu castet
2010-11-18 14:08 ` [tip:x86/security] x86: Add " tip-bot for Matthieu Castet
2011-01-11 23:31 ` Kees Cook [this message]
2011-01-14 20:15 ` Konrad Rzeszutek Wilk
2011-01-19 21:14 ` Konrad Rzeszutek Wilk
2011-01-19 22:59 ` matthieu castet
2011-01-19 23:38 ` Konrad Rzeszutek Wilk
2011-01-20 11:18 ` castet.matthieu
2011-01-20 15:06 ` Konrad Rzeszutek Wilk
2011-01-20 15:37 ` Ian Campbell
2011-01-20 19:05 ` Konrad Rzeszutek Wilk
2011-01-20 20:23 ` matthieu castet
2011-01-20 21:04 ` Konrad Rzeszutek Wilk
2011-01-20 21:19 ` Konrad Rzeszutek Wilk
2011-01-20 21:55 ` Konrad Rzeszutek Wilk
2011-01-21 21:41 ` matthieu castet
2011-01-22 5:11 ` Konrad Rzeszutek Wilk
2011-01-23 14:27 ` matthieu castet
2011-01-24 15:31 ` Konrad Rzeszutek Wilk
2011-01-27 16:30 ` Was: [tip:x86/security] x86: Add NX protection for kernel data. Is: don't set RW on RO regions in .bss Konrad Rzeszutek Wilk
2011-01-21 23:20 ` [tip:x86/security] x86: Add NX protection for kernel data Konrad Rzeszutek Wilk
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