Hi Andrew,
On 18/05/17 16:02, Andrew Cooper wrote:
On 18/05/17 15:31, Tim Deegan wrote:
Hi,
At 15:02 +0100 on 18 May (1495119734), Andrew Cooper wrote:
* When fabricating gl1e's from superpages, propagate the protection key as
well, so the protection key logic sees the real key as opposed to 0.
* Experimentally, the protection key checks are performed ahead of the other
access rights. In particular, accesses which fail both protection key and
regular permission checks yield PFEC_prot_key in the resulting pagefault.
* Protection keys apply to all user mode data accesses, including accesses
from supervisor code.
I think this would be clearer as "all data accesses to user-mode addresses".
Done.
PKRU WD applies to any data write, not just to
mapping which are writable. However, a supervisor access without CR0.WP
bypasses any protection from protection keys.
Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Tim Deegan <t...@xen.org>
Release-acked-by: Julien Grall <julien.gr...@arm.com>
Cheers,
--
Julien Grall
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