Commit 718d9b38 authored Jul 09, 2020 by Aneesh Kumar K.V Committed by Michael Ellerman Jul 20, 2020

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



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

parent f491fe3f

arch/powerpc/mm/book3s64/pkeys.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

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