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Re: [Xen-devel] [kernel-hardening] Re: [PATCH] x86: make IDT read-only

On Tue, Apr 9, 2013 at 11:50 AM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> On 04/09/2013 11:46 AM, Kees Cook wrote:
>> Ah-ha! Yes, I see now when comparing the debug/kernel_page_tables
>> reports. It's just the High Kernel Mapping that we care about.
>> Addresses outside that range are less of a leak. Excellent, then GDT
>> may not be a problem. Whew.
> It does beg the question if we need to randomize kmalloc... which could
> have issues by itself.

Agreed, but this should be a separate issue. As is the fact that GDT
is writable and a discoverable target.


Kees Cook
Chrome OS Security

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