Allow the .machine keyring to be linked to the secondary_trusted_keys.
After the link is created, keys contained in the .machine keyring will
automatically be searched when searching secondary_trusted_keys.

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
---
v3: Initial version
v4: Unmodified from v3
v5: Rename to machine keyring
v6: Unmodified from v5
---
 certs/system_keyring.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index ba732856ebd0..2a2dc70b126c 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c

@@ -101,6 +101,9 @@ static __init struct key_restriction *get_secondary_restriction(void)
 void __init set_machine_trusted_keys(struct key *keyring)
 {
 	machine_trusted_keys = keyring;
+
+	if (key_link(secondary_trusted_keys, machine_trusted_keys) < 0)
+		panic("Can't link (machine) trusted keyrings\n");
 }
 
 /**

-- 
2.18.4