ima: require signed IMA policy

Require the IMA policy to be signed when additional rules can be added.

Changelog v2:
- add union name "hooks" to fix sparse warning
v1:
- initialize the policy flag
- include IMA_APPRAISE_POLICY in the policy flag

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
1 file changed