# \[PATCH v4 04/12\] integrity: restrict INTEGRITY\_KEYRING\_MOK to restrict\_link\_by\_ca - From: Eric Snowberg \ - Date: 2021-08-19 00:22:45 - List: linux-crypto - Page: https://ratatoskr.run/linux-crypto/2021/08/1482272 - Thread: https://ratatoskr.run/keyrings/2021/08/1482265/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 v4: removed unnecessary restriction->check set --- security/integrity/digsig.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 5cad38e6f56a..1f410242752c 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -132,14 +132,18 @@ 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); if (!restriction) 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; + if (id != INTEGRITY_KEYRING_MOK) perm |= KEY_USR_WRITE; -- 2.18.4 ```