security/keys: add CONFIG_KEYS_COMPAT to Kconfig

On Wed, Mar 29, 2017 at 12:20:02PM -0700, Eric Biggers wrote:

On Thu,  9 Feb 2017 22:11:38 +0100, Bilal Amarni wrote:

quoted

CONFIG_KEYS_COMPAT is defined in arch-specific Kconfigs and is missing for
several 64-bit architectures : arm64, mips, parisc, tile.

At the moment and for those architectures, calling in 32-bit userspace the
keyctl syscall would return an ENOSYS error.

This patch moves the CONFIG_KEYS_COMPAT option to security/keys/Kconfig, to
make sure the compatibility wrapper is registered by default for any 64-bit
architecture as long as it is configured with CONFIG_COMPAT.

David, where can I find the git branch this patch was applied to?  I don't see
it anywhere in security-keys or linux-security.

I recently added KEYS_COMPAT to arm64 (5c2a625937ba); that should be reverted
after this patch.

Also, I'd like to submit a follow-on patch that removes KEYS_COMPAT and simply
uses COMPAT.

And the parisc architecture doesn't use compat_sys_keyctl() in its compat
syscall table, so that should be fixed too (though that's not a new bug).

- Eric

This patch is in the "keys-fixes" branch now, but it doesn't remove KEYS_COMPAT
from arch/arm64/Kconfig.  David, can you fix it?  Thanks!

Eric
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