[S390] KEYS: Enable the compat keyctl wrapper on s390x

Enable the compat keyctl wrapper on s390x so that 32-bit s390 userspace can
call the keyctl() syscall.

There's an s390x assembly wrapper that truncates all the register values to
32-bits and this then calls compat_sys_keyctl() - but the latter only exists if
CONFIG_KEYS_COMPAT is enabled, and the s390 Kconfig doesn't enable it.

Without this patch, 32-bit calls to the keyctl() syscall are given an ENOSYS
error:

	[root@devel4 ~]# keyctl show
	Session Keyring
	-3: key inaccessible (Function not implemented)

Signed-off-by: David Howells <[email protected]>
Acked-by: [email protected]
Cc: Carsten Otte <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index d1727584230a66b504ae1e9e0beed8f3522c5b23..6d99a5fcc09030114dd8d475e6fe54184fc59814 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -227,6 +227,9 @@ config COMPAT
 config SYSVIPC_COMPAT
        def_bool y if COMPAT && SYSVIPC
 
+config KEYS_COMPAT
+       def_bool y if COMPAT && KEYS
+
 config AUDIT_ARCH
        def_bool y