KEYS: special dot prefixed keyring name bug fix

Dot prefixed keyring names are supposed to be reserved for the
kernel, but add_key() calls key_get_type_from_user(), which
incorrectly verifies the 'type' field, not the 'description' field.
This patch verifies the 'description' field isn't dot prefixed,
when creating a new keyring, and removes the dot prefix test in
key_get_type_from_user().

Changelog v6:
- whitespace and other cleanup

Changelog v5:
- Only prevent userspace from creating a dot prefixed keyring, not
  regular keys  - Dmitry

Reported-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index cd5bd0c..8a8c233 100644 (file)
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -37,8 +37,6 @@ static int key_get_type_from_user(char *type,
                return ret;
        if (ret == 0 || ret >= len)
                return -EINVAL;
-       if (type[0] == '.')
-               return -EPERM;
        type[len - 1] = '\0';
        return 0;
 }
@@ -86,6 +84,10 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
                if (!*description) {
                        kfree(description);
                        description = NULL;
+               } else if ((description[0] == '.') &&
+                          (strncmp(type, "keyring", 7) == 0)) {
+                       ret = -EPERM;
+                       goto error2;
                }
        }