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-rw-r--r--Documentation/security/keys.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/security/keys.txt b/Documentation/security/keys.txt
index e35de987fc48..5fe04a7cc03d 100644
--- a/Documentation/security/keys.txt
+++ b/Documentation/security/keys.txt
@@ -1445,6 +1445,15 @@ The structure has a number of fields, some of which are mandatory:
The authorisation key.
+ (*) struct key_restriction *(*lookup_restriction)(const char *params);
+
+ This optional method is used to enable userspace configuration of keyring
+ restrictions. The restriction parameter string (not including the key type
+ name) is passed in, and this method returns a pointer to a key_restriction
+ structure containing the relevant functions and data to evaluate each
+ attempted key link operation. If there is no match, -EINVAL is returned.
+
+
============================
REQUEST-KEY CALLBACK SERVICE
============================