[PATCH 5/7] KEYS: Introduce sig restriction that validates root of trust

[kernel test robot]

Hi Eric,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on 3123109284176b1532874591f7c81f3837bbdc17]

url:    https://github.com/intel-lab-lkp/linux/commits/Eric-Snowberg/Add-CA-enforcement-keyring-restrictions/20220407-003209
base:   3123109284176b1532874591f7c81f3837bbdc17
config: riscv-randconfig-r042-20220406 (https://download.01.org/0day-ci/archive/20220407/202204070321.X7bLj3Ce-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/68d98a175d29032d888f3f5700c43cf771ef17d8
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Eric-Snowberg/Add-CA-enforcement-keyring-restrictions/20220407-003209
        git checkout 68d98a175d29032d888f3f5700c43cf771ef17d8
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash crypto/asymmetric_keys/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> crypto/asymmetric_keys/restrict.c:111:5: warning: no previous prototype for 'restrict_link_by_rot_and_signature' [-Wmissing-prototypes]
     111 | int restrict_link_by_rot_and_signature(struct key *dest_keyring,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/restrict_link_by_rot_and_signature +111 crypto/asymmetric_keys/restrict.c

   110	
 > 111	int restrict_link_by_rot_and_signature(struct key *dest_keyring,
   112					       const struct key_type *type,
   113					       const union key_payload *payload,
   114					       struct key *trust_keyring)
   115	{
   116		const struct public_key_signature *sig;
   117		struct key *key;
   118		int ret;
   119	
   120		if (!trust_keyring)
   121			return -ENOKEY;
   122	
   123		if (type != &key_type_asymmetric)
   124			return -EOPNOTSUPP;
   125	
   126		sig = payload->data[asym_auth];
   127		if (!sig)
   128			return -ENOPKG;
   129		if (!sig->auth_ids[0] && !sig->auth_ids[1] && !sig->auth_ids[2])
   130			return -ENOKEY;
   131	
   132		if (ca_keyid && !asymmetric_key_id_partial(sig->auth_ids[1], ca_keyid))
   133			return -EPERM;
   134	
   135		/* See if we have a key that signed this one. */
   136		key = find_asymmetric_key(trust_keyring,
   137					  sig->auth_ids[0], sig->auth_ids[1],
   138					  sig->auth_ids[2], false);
   139		if (IS_ERR(key))
   140			return -ENOKEY;
   141	
   142		if (!test_bit(KEY_FLAG_BUILTIN_ROT, &key->flags))
   143			ret = -ENOKEY;
   144		else if (use_builtin_keys && !test_bit(KEY_FLAG_BUILTIN, &key->flags))
   145			ret = -ENOKEY;
   146		else
   147			ret = verify_signature(key, sig);
   148		key_put(key);
   149		return ret;
   150	}
   151	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp