diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-07-09 08:59:30 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-20 22:57:58 +1000 |
| commit | 718d9b380174eb8fe16d67769395737b79654a02 (patch) | |
| tree | 54ac6e0f1d0f3dffb4d2117aa6ffa9806e7c7d4a | |
| parent | f491fe3fb41eafc7a159874040e032ad41ade210 (diff) | |
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
| -rw-r--r-- | arch/powerpc/mm/book3s64/pkeys.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c index 2dea8c29df57..e2bf93901bd0 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 |