KEYS: validate key trust with owner and builtin keys only

This is a repost of the patchset cleanly on the top of linux-integrity next-trusted-keys branch.

Instead of allowing public keys, with certificates signed by any key on the system trusted keyring, to be added to a trusted keyring, this patch set further restricts the certificates to those signed by a particular key or builtin keys on the system keyring.

This patch defines a new kernel parameter 'keys_ownerid={id:xxx | builtin}' to use specific key or any builtin key.

Thanks,
Dmitry

Dmitry Kasatkin (2):
KEYS: validate certificate trust only with selected owner key
KEYS: validate certificate trust only with builtin keys

 Documentation/kernel-parameters.txt      |  5 +++++
 crypto/asymmetric_keys/x509_public_key.c | 32 ++++++++++++++++++++++++++++++--
 include/linux/key.h                      |  1 +
 kernel/system_keyring.c                  |  1 +
 4 files changed, 37 insertions(+), 2 deletions(-)

1.9.1