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-rw-r--r--certs/system_keyring.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index 417d65882870..4e2fa8ab01d6 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -18,12 +18,26 @@
#include <keys/system_keyring.h>
#include <crypto/pkcs7.h>
-struct key *system_trusted_keyring;
-EXPORT_SYMBOL_GPL(system_trusted_keyring);
+static struct key *system_trusted_keyring;
extern __initconst const u8 system_certificate_list[];
extern __initconst const unsigned long system_certificate_list_size;
+/**
+ * restrict_link_by_builtin_trusted - Restrict keyring addition by system CA
+ *
+ * Restrict the addition of keys into a keyring based on the key-to-be-added
+ * being vouched for by a key in the system keyring.
+ */
+int restrict_link_by_builtin_trusted(struct key *keyring,
+ const struct key_type *type,
+ unsigned long flags,
+ const union key_payload *payload)
+{
+ return restrict_link_by_signature(system_trusted_keyring,
+ type, payload);
+}
+
/*
* Load the compiled-in keys
*/
@@ -37,7 +51,7 @@ static __init int system_trusted_keyring_init(void)
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
KEY_ALLOC_NOT_IN_QUOTA,
- keyring_restrict_trusted_only, NULL);
+ restrict_link_by_builtin_trusted, NULL);
if (IS_ERR(system_trusted_keyring))
panic("Can't allocate system trusted keyring\n");
return 0;