Subject: [PATCH v5 06/26] powerpc/book3s64/pkeys: Prevent key 1 modification from userspace.

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Fri, 19 Jun 2020 19:28:30 +0530

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

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 arch/powerpc/mm/book3s64/pkeys.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c
index 3db0b3cfc322..9e68a08799ee 100644
--- a/arch/powerpc/mm/book3s64/pkeys.c
+++ b/arch/powerpc/mm/book3s64/pkeys.c
@@ -174,6 +174,7 @@ 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
-- 
2.26.2