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Diffstat (limited to 'security/keys/key.c')
-rw-r--r--security/keys/key.c46
1 files changed, 25 insertions, 21 deletions
diff --git a/security/keys/key.c b/security/keys/key.c
index b4958b36fa27..455c04d80bbb 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -201,12 +201,15 @@ serial_exists:
* @cred: The credentials specifying UID namespace.
* @perm: The permissions mask of the new key.
* @flags: Flags specifying quota properties.
- * @restrict_link: Optional link restriction method for new keyrings.
+ * @restrict_link: Optional link restriction for new keyrings.
*
* Allocate a key of the specified type with the attributes given. The key is
* returned in an uninstantiated state and the caller needs to instantiate the
* key before returning.
*
+ * The restrict_link structure (if not NULL) will be freed when the
+ * keyring is destroyed, so it must be dynamically allocated.
+ *
* The user's key count quota is updated to reflect the creation of the key and
* the user's key data quota has the default for the key type reserved. The
* instantiation function should amend this as necessary. If insufficient
@@ -225,9 +228,7 @@ serial_exists:
struct key *key_alloc(struct key_type *type, const char *desc,
kuid_t uid, kgid_t gid, const struct cred *cred,
key_perm_t perm, unsigned long flags,
- int (*restrict_link)(struct key *,
- const struct key_type *,
- const union key_payload *))
+ struct key_restriction *restrict_link)
{
struct key_user *user = NULL;
struct key *key;
@@ -499,19 +500,23 @@ int key_instantiate_and_link(struct key *key,
}
if (keyring) {
- if (keyring->restrict_link) {
- ret = keyring->restrict_link(keyring, key->type,
- &prep.payload);
- if (ret < 0)
- goto error;
- }
ret = __key_link_begin(keyring, &key->index_key, &edit);
if (ret < 0)
goto error;
+
+ if (keyring->restrict_link && keyring->restrict_link->check) {
+ struct key_restriction *keyres = keyring->restrict_link;
+
+ ret = keyres->check(keyring, key->type, &prep.payload,
+ keyres->key);
+ if (ret < 0)
+ goto error_link_end;
+ }
}
ret = __key_instantiate_and_link(key, &prep, keyring, authkey, &edit);
+error_link_end:
if (keyring)
__key_link_end(keyring, &key->index_key, edit);
@@ -806,9 +811,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
struct key *keyring, *key = NULL;
key_ref_t key_ref;
int ret;
- int (*restrict_link)(struct key *,
- const struct key_type *,
- const union key_payload *) = NULL;
+ struct key_restriction *restrict_link = NULL;
/* look up the key type to see if it's one of the registered kernel
* types */
@@ -854,20 +857,21 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
}
index_key.desc_len = strlen(index_key.description);
- if (restrict_link) {
- ret = restrict_link(keyring, index_key.type, &prep.payload);
- if (ret < 0) {
- key_ref = ERR_PTR(ret);
- goto error_free_prep;
- }
- }
-
ret = __key_link_begin(keyring, &index_key, &edit);
if (ret < 0) {
key_ref = ERR_PTR(ret);
goto error_free_prep;
}
+ if (restrict_link && restrict_link->check) {
+ ret = restrict_link->check(keyring, index_key.type,
+ &prep.payload, restrict_link->key);
+ if (ret < 0) {
+ key_ref = ERR_PTR(ret);
+ goto error_link_end;
+ }
+ }
+
/* if we're going to allocate a new key, we're going to have
* to modify the keyring */
ret = key_permission(keyring_ref, KEY_NEED_WRITE);