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| author |   Ram Pai <linuxram@us.ibm.com> | 2018-07-17 06:51:03 -0700 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-07-24 21:33:41 +1000 |
| commit | de113256f8c1c24d8c79ae388bf2a5abd70f7577 (patch) | |
| tree | 1ee5ff88eddd380bd15ceaa30f41b8843a889b5b /arch/powerpc/mm/pkeys.c | |
| parent | powerpc/pkeys: Give all threads control of their key permissions (diff) | |
| download | linux-dev-de113256f8c1c24d8c79ae388bf2a5abd70f7577.tar.xz linux-dev-de113256f8c1c24d8c79ae388bf2a5abd70f7577.zip | |
powerpc/pkeys: Deny read/write/execute by default
Deny all permissions on all keys, with some exceptions. pkey-0 must
allow all permissions, or else everything comes to a screaching halt.
Execute-only key must allow execute permission.
Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem")
Cc: stable@vger.kernel.org # v4.16+
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pkeys.c')
| -rw-r--r-- | arch/powerpc/mm/pkeys.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c index 6b55373f8c43..98180f49ac5e 100644 --- a/arch/powerpc/mm/pkeys.c +++ b/arch/powerpc/mm/pkeys.c @@ -124,12 +124,10 @@ int pkey_initialize(void) /* register mask is in BE format */ pkey_amr_mask = ~0x0ul; - pkey_iamr_mask = ~0x0ul; + pkey_amr_mask &= ~(0x3ul << pkeyshift(0)); - for (i = 0; i < (pkeys_total - os_reserved); i++) { - pkey_amr_mask &= ~(0x3ul << pkeyshift(i)); - pkey_iamr_mask &= ~(0x1ul << pkeyshift(i)); - } + pkey_iamr_mask = ~0x0ul; + pkey_iamr_mask &= ~(0x3ul << pkeyshift(0)); pkey_uamor_mask = ~0x0ul; pkey_uamor_mask &= ~(0x3ul << pkeyshift(0)); |