Re: [PATCH 2/2] KEYS: Add keyagent request_key

[kernel test robot <lkp@intel.com>]

Hi Benjamin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on jmorris-security/next-testing]
[also build test WARNING on dhowells-fs/fscache-next arnd-asm-generic/master linus/master v5.19-rc6 next-20220714]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Benjamin-Coddington/Keyagents-another-call_usermodehelper-approach-for-namespaces/20220712-203658
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git next-testing
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220715/202207152310.dTPT29kb-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/4d4f4ae463335d3e611bdb71330ab37af115cde9
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Benjamin-Coddington/Keyagents-another-call_usermodehelper-approach-for-namespaces/20220712-203658
        git checkout 4d4f4ae463335d3e611bdb71330ab37af115cde9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash security/keys/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> security/keys/keyagent.c:78:5: warning: no previous prototype for 'keyagent_request_key' [-Wmissing-prototypes]
      78 | int keyagent_request_key(struct key *authkey, void *aux)
         |     ^~~~~~~~~~~~~~~~~~~~


vim +/keyagent_request_key +78 security/keys/keyagent.c

    72	
    73	/*
    74	 * Search the calling process' keyrings for a keyagent that
    75	 * matches the requested key type.  If found, signal the keyagent
    76	 * to construct and link the key, else return -ENOKEY.
    77	 */
  > 78	int keyagent_request_key(struct key *authkey, void *aux)
    79	{
    80		struct key *ka_key, *target_key;
    81		struct request_key_auth *rka;
    82		key_ref_t ka_ref;
    83		const struct cred *cred = current_cred();
    84		int ret;
    85	
    86		/* We must be careful not to touch authkey and aux if
    87		 * returning -ENOKEY, since it will be reused.   */
    88		rka = get_request_key_auth(authkey);
    89		target_key = rka->target_key;
    90	
    91		/* Does the calling process have a keyagent in its session keyring? */
    92		ka_ref = keyring_search(
    93						make_key_ref(cred->session_keyring, 1),
    94						&key_type_keyagent,
    95						target_key->type->name, false);
    96	
    97		if (IS_ERR(ka_ref))
    98			return -ENOKEY;
    99	
   100		/* We found a keyagent, let's call out to it. */
   101		ka_key = key_ref_to_ptr(ka_ref);
   102		ret = keyagent_signal(ka_key, target_key, authkey);
   103		key_put(key_ref_to_ptr(ka_ref));
   104	
   105		return ret;
   106	}
   107	

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