[PATCH v6 12/23] powerpc/book3s64/pkeys: Mark all the pkeys above max pkey as reserved

[Aneesh Kumar K.V]

The hypervisor can return less than max allowed pkey (for ex: 31) instead
of 32. We should mark all the pkeys above max allowed as reserved so
that we avoid the allocation of the wrong pkey(for ex: key 31 in the above
case) by userspace.

Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
---
 arch/powerpc/mm/book3s64/pkeys.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c
index ecbbf548e08f..ac272166e5b4 100644
--- a/arch/powerpc/mm/book3s64/pkeys.c
+++ b/arch/powerpc/mm/book3s64/pkeys.c
@@ -189,9 +189,10 @@ static int pkey_initialize(void)
 
        /*
         * Prevent the usage of OS reserved keys. Update UAMOR
-        * for those keys.
+        * for those keys. Also mark the rest of the bits in the
+        * 32 bit mask as reserved.
         */
-       for (i = num_pkey; i < pkeys_total; i++) {
+       for (i = num_pkey; i < 32 ; i++) {
                reserved_allocation_mask |= (0x1 << i);
                default_uamor &= ~(0x3ul << pkeyshift(i));
        }
-- 
2.26.2