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-rw-r--r--Documentation/security/keys/core.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/security/keys/core.rst b/Documentation/security/keys/core.rst
index 0d831a7afe4f..1648fa80b3bf 100644
--- a/Documentation/security/keys/core.rst
+++ b/Documentation/security/keys/core.rst
@@ -894,6 +894,12 @@ The keyctl syscall functions are:
To apply a keyring restriction the process must have Set Attribute
permission and the keyring must not be previously restricted.
+ One application of restricted keyrings is to verify X.509 certificate
+ chains or individual certificate signatures using the asymmetric key type.
+ See Documentation/crypto/asymmetric-keys.txt for specific restrictions
+ applicable to the asymmetric key type.
+
+
Kernel Services
===============