The KEY_CHECK function only supports the uid, pcr, and keyrings
conditionals. Make this clear at policy load so that IMA policy authors
don't assume that other conditionals are supported.

Fixes: 5808611cccb2 ("IMA: Add KEY_CHECK func to measure keys")
Signed-off-by: Tyler Hicks <redacted>
---

* v2
   - No change

  security/integrity/ima/ima_policy.c | 7 +++++++
  1 file changed, 7 insertions(+)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 676d5557af1a..f9b1bdb897da 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c

@@ -1018,6 +1018,13 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
  			if (entry->action & ~(MEASURE | DONT_MEASURE))
  				return false;
  
+			if (entry->flags & ~(IMA_FUNC | IMA_UID | IMA_PCR |
+					     IMA_KEYRINGS))
+				return false;
+
+			if (ima_rule_contains_lsm_cond(entry))
+				return false;
+
  			break;
  		default:
  			return false;