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powerpc/book3s64/pkeys: Prevent key 1 modification from userspace.

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Key 1 is marked reserved by ISA. Setup uamor to prevent userspace modification
of the same.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709032946.881753-8-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V 2020-07-09 08:59:30 +05:30 committed by Michael Ellerman
parent f491fe3fb4
commit 718d9b3801
1 changed files with 1 additions and 0 deletions
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1
arch/powerpc/mm/book3s64/pkeys.c
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@ -183,6 +183,7 @@ static int pkey_initialize(void)
* programming note.
*/
reserved_allocation_mask |= (0x1 << 1);
default_uamor &= ~(0x3ul << pkeyshift(1));
/*
* Prevent the usage of OS reserved the keys. Update UAMOR