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-rw-r--r--security/keys/request_key.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index bf1d223ec21c..b4b3677657d6 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -756,3 +756,47 @@ struct key *request_key_async_with_auxdata(struct key_type *type,
callout_len, aux, NULL, KEY_ALLOC_IN_QUOTA);
}
EXPORT_SYMBOL(request_key_async_with_auxdata);
+
+/**
+ * request_key_rcu - Request key from RCU-read-locked context
+ * @type: The type of key we want.
+ * @description: The name of the key we want.
+ *
+ * Request a key from a context that we may not sleep in (such as RCU-mode
+ * pathwalk). Keys under construction are ignored.
+ *
+ * Return a pointer to the found key if successful, -ENOKEY if we couldn't find
+ * a key or some other error if the key found was unsuitable or inaccessible.
+ */
+struct key *request_key_rcu(struct key_type *type, const char *description)
+{
+ struct keyring_search_context ctx = {
+ .index_key.type = type,
+ .index_key.description = description,
+ .index_key.desc_len = strlen(description),
+ .cred = current_cred(),
+ .match_data.cmp = key_default_cmp,
+ .match_data.raw_data = description,
+ .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
+ .flags = (KEYRING_SEARCH_DO_STATE_CHECK |
+ KEYRING_SEARCH_SKIP_EXPIRED),
+ };
+ struct key *key;
+ key_ref_t key_ref;
+
+ kenter("%s,%s", type->name, description);
+
+ /* search all the process keyrings for a key */
+ key_ref = search_process_keyrings_rcu(&ctx);
+ if (IS_ERR(key_ref)) {
+ key = ERR_CAST(key_ref);
+ if (PTR_ERR(key_ref) == -EAGAIN)
+ key = ERR_PTR(-ENOKEY);
+ } else {
+ key = key_ref_to_ptr(key_ref);
+ }
+
+ kleave(" = %p", key);
+ return key;
+}
+EXPORT_SYMBOL(request_key_rcu);