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powerpc/pkeys: Deny read/write/execute by default

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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: cf43d3b264 ("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>
This commit is contained in:
Ram Pai 2018-07-17 06:51:03 -07:00 committed by Michael Ellerman
parent a57a04c76e
commit de113256f8
1 changed files with 3 additions and 5 deletions
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8
arch/powerpc/mm/pkeys.c
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@ -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));