# \[PATCH v3 05/14\] integrity: restrict INTEGRITY\_KEYRING\_MOK to restrict\_link\_by\_ca - From: Eric Snowberg \ - Date: 2021-08-12 02:20:46 - List: linux-crypto - Page: https://ratatoskr.run/linux-crypto/2021/08/1475607 - Thread: https://ratatoskr.run/keyrings/2021/08/1475609/t.md ```text Set the restriction check for INTEGRITY_KEYRING_MOK keys to restrict_link_by_ca. This will only allow CA keys into the mok keyring. Signed-off-by: Eric Snowberg --- v1: Initial version v2: Added !IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING check so mok keyring gets created even when it isn't enabled v3: Rename restrict_link_by_system_trusted_or_ca to restrict_link_by_ca --- security/integrity/digsig.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index e07334504ef1..ec94d564c68a 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -132,7 +132,7 @@ int __init integrity_init_keyring(const unsigned int id) goto out; } - if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING)) + if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING) && id != INTEGRITY_KEYRING_MOK) return 0; restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); @@ -140,6 +140,11 @@ int __init integrity_init_keyring(const unsigned int id) return -ENOMEM; restriction->check = restrict_link_to_ima; + if (id == INTEGRITY_KEYRING_MOK) + restriction->check = restrict_link_by_ca; + else + restriction->check = restrict_link_to_ima; + perm |= KEY_USR_WRITE; out: -- 2.18.4 ```