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Re: [Xen-devel] [kernel-hardening] Re: [PATCH] x86: make IDT read-only
- To: "H. Peter Anvin" <hpa@xxxxxxxxx>
- From: Ingo Molnar <mingo@xxxxxxxxxx>
- Date: Wed, 10 Apr 2013 11:52:12 +0200
- Cc: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>, Alex Shi <alex.shi@xxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Will Drewry <wad@xxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Julien Tinnes <jln@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Frederic Weisbecker <fweisbec@xxxxxxxxx>, Dan Rosenberg <drosenberg@xxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Borislav Petkov <borislav.petkov@xxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Eric Northup <digitaleric@xxxxxxxxxx>, "kernel-hardening@xxxxxxxxxxxxxxxxxx" <kernel-hardening@xxxxxxxxxxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, "virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx" <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 10 Apr 2013 09:53:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
* H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> On 04/09/2013 11:22 AM, Kees Cook wrote:
> >
> > Can we create a RO fixed per-cpu area?
> >
>
> "Fixed" and "percpu" are mutually exclusive...
There's a fixmap area that holds kmap_atomic() percpu mappings:
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
In a similar fashion we could use a per CPU high-mapped read-only alias as well
(assuming it fits, memory is pretty tight there).
Thanks,
Ingo
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