diff options
Diffstat (limited to 'certs/system_keyring.c')
| -rw-r--r-- | certs/system_keyring.c | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/certs/system_keyring.c b/certs/system_keyring.c index 50979d6dcecd..6251d1b27f0c 100644 --- a/certs/system_keyring.c +++ b/certs/system_keyring.c @@ -14,6 +14,7 @@ #include <linux/sched.h> #include <linux/cred.h> #include <linux/err.h> +#include <linux/slab.h> #include <keys/asymmetric-type.h> #include <keys/system_keyring.h> #include <crypto/pkcs7.h> @@ -32,11 +33,13 @@ extern __initconst const unsigned long system_certificate_list_size; * Restrict the addition of keys into a keyring based on the key-to-be-added * being vouched for by a key in the built in system keyring. */ -int restrict_link_by_builtin_trusted(struct key *keyring, +int restrict_link_by_builtin_trusted(struct key *dest_keyring, const struct key_type *type, - const union key_payload *payload) + const union key_payload *payload, + struct key *restriction_key) { - return restrict_link_by_signature(builtin_trusted_keys, type, payload); + return restrict_link_by_signature(dest_keyring, type, payload, + builtin_trusted_keys); } #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING @@ -49,20 +52,40 @@ int restrict_link_by_builtin_trusted(struct key *keyring, * keyrings. */ int restrict_link_by_builtin_and_secondary_trusted( - struct key *keyring, + struct key *dest_keyring, const struct key_type *type, - const union key_payload *payload) + const union key_payload *payload, + struct key *restrict_key) { /* If we have a secondary trusted keyring, then that contains a link * through to the builtin keyring and the search will follow that link. */ if (type == &key_type_keyring && - keyring == secondary_trusted_keys && + dest_keyring == secondary_trusted_keys && payload == &builtin_trusted_keys->payload) /* Allow the builtin keyring to be added to the secondary */ return 0; - return restrict_link_by_signature(secondary_trusted_keys, type, payload); + return restrict_link_by_signature(dest_keyring, type, payload, + secondary_trusted_keys); +} + +/** + * Allocate a struct key_restriction for the "builtin and secondary trust" + * keyring. Only for use in system_trusted_keyring_init(). + */ +static __init struct key_restriction *get_builtin_and_secondary_restriction(void) +{ + struct key_restriction *restriction; + + restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); + + if (!restriction) + panic("Can't allocate secondary trusted keyring restriction\n"); + + restriction->check = restrict_link_by_builtin_and_secondary_trusted; + + return restriction; } #endif @@ -91,7 +114,7 @@ static __init int system_trusted_keyring_init(void) KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH | KEY_USR_WRITE), KEY_ALLOC_NOT_IN_QUOTA, - restrict_link_by_builtin_and_secondary_trusted, + get_builtin_and_secondary_restriction(), NULL); if (IS_ERR(secondary_trusted_keys)) panic("Can't allocate secondary trusted keyring\n"); |