[PATCH v4 06/41] powerpc/book3s64/pkeys: Prevent key 1 modification from userspace.
From: Aneesh Kumar K.V <hidden>
Date: 2020-06-15 06:27:34
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Key 1 is marked reserved by ISA. Setup uamor to prevent userspace modification of the same. Signed-off-by: Aneesh Kumar K.V <redacted> --- 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
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2.26.2