IMA: prevent keys on the .ima_blacklist from being removed
Set the KEY_FLAGS_KEEP on the .ima_blacklist to prevent userspace
from removing keys from the keyring.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
diff --git a/security/integrity/ima/ima_mok.c b/security/integrity/ima/ima_mok.c
index 18e37f5..8dad9a2 100644
--- a/security/integrity/ima/ima_mok.c
+++ b/security/integrity/ima/ima_mok.c
@@ -47,7 +47,9 @@
if (IS_ERR(ima_mok_keyring) || IS_ERR(ima_blacklist_keyring))
panic("Can't allocate IMA MOK or blacklist keyrings.");
set_bit(KEY_FLAG_TRUSTED_ONLY, &ima_mok_keyring->flags);
+
set_bit(KEY_FLAG_TRUSTED_ONLY, &ima_blacklist_keyring->flags);
+ set_bit(KEY_FLAG_KEEP, &ima_blacklist_keyring->flags);
return 0;
}