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SubjectRe: [tip:x86/security] x86: Add NX protection for kernel data
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


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