From 718d9b380174eb8fe16d67769395737b79654a02 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Thu, 9 Jul 2020 08:59:30 +0530 Subject: [PATCH] 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200709032946.881753-8-aneesh.kumar@linux.ibm.com --- 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 2dea8c2..e2bf939 100644 --- a/arch/powerpc/mm/book3s64/pkeys.c +++ b/arch/powerpc/mm/book3s64/pkeys.c @@ -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 -- 2.7.4