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authorDavid Howells <dhowells@redhat.com>2013-08-30 16:07:37 +0100
committerDavid Howells <dhowells@redhat.com>2013-09-25 17:17:01 +0100
commit008643b86c5f33c115c84ccdda1725cac3ad50ad (patch)
tree951ea0d3d7b84ce3570da17f03f45a53f3e4b35d /security/keys/keyring.c
parentb56e5a17b6b9acd16997960504b9940d0d7984e7 (diff)
KEYS: Add a 'trusted' flag and a 'trusted only' flag
Add KEY_FLAG_TRUSTED to indicate that a key either comes from a trusted source or had a cryptographic signature chain that led back to a trusted key the kernel already possessed. Add KEY_FLAGS_TRUSTED_ONLY to indicate that a keyring will only accept links to keys marked with KEY_FLAGS_TRUSTED. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'security/keys/keyring.c')
-rw-r--r--security/keys/keyring.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index f7cdea22214f..9b6f6e09b50c 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -1183,6 +1183,10 @@ int key_link(struct key *keyring, struct key *key)
key_check(keyring);
key_check(key);
+ if (test_bit(KEY_FLAG_TRUSTED_ONLY, &keyring->flags) &&
+ !test_bit(KEY_FLAG_TRUSTED, &key->flags))
+ return -EPERM;
+
ret = __key_link_begin(keyring, &key->index_key, &edit);
if (ret == 0) {
kdebug("begun {%d,%d}", keyring->serial, atomic_read(&keyring->usage));