[PATCH v3 6/9] security: Hornet LSM

[kernel test robot]

Hi Blaise,

kernel test robot noticed the following build errors:

[auto build test ERROR on herbert-cryptodev-2.6/master]
[also build test ERROR on herbert-crypto-2.6/master shuah-kselftest/next shuah-kselftest/fixes linus/master v7.0-rc5 next-20260327]
[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/Blaise-Boscaccy/crypto-pkcs7-add-flag-for-validated-trust-on-a-signed-info-block/20260327-145024
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
patch link:    https://lore.kernel.org/r/20260326060655.2550595-7-bboscaccy%40linux.microsoft.com
patch subject: [PATCH v3 6/9] security: Hornet LSM
config: x86_64-randconfig-102-20260328 (https://download.01.org/0day-ci/archive/20260328/202603281030.AIoqyOy3-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260328/202603281030.AIoqyOy3-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603281030.AIoqyOy3-lkp@intel.com/

All errors (new ones prefixed by >>):

>> security/hornet/hornet_lsm.c:194:6: error: call to undeclared function 'verify_pkcs7_message_sig'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     194 |         if (verify_pkcs7_message_sig(prog->insnsi, prog->len * sizeof(struct bpf_insn), msg,
         |             ^
   1 error generated.


vim +/verify_pkcs7_message_sig +194 security/hornet/hornet_lsm.c

   155	
   156	static int hornet_check_program(struct bpf_prog *prog, union bpf_attr *attr,
   157					struct bpf_token *token, bool is_kernel,
   158					enum lsm_integrity_verdict *verdict)
   159	{
   160		struct hornet_maps maps = {0};
   161		bpfptr_t usig = make_bpfptr(attr->signature, is_kernel);
   162		struct pkcs7_message *msg;
   163		struct hornet_parse_context *ctx;
   164		void *sig;
   165		int err;
   166		const void *authattrs;
   167		size_t authattrs_len;
   168	
   169		if (!attr->signature) {
   170			*verdict = LSM_INT_VERDICT_UNSIGNED;
   171			return 0;
   172		}
   173	
   174		ctx = kzalloc(sizeof(struct hornet_parse_context), GFP_KERNEL);
   175		if (!ctx)
   176			return -ENOMEM;
   177	
   178		maps.fd_array = make_bpfptr(attr->fd_array, is_kernel);
   179		sig = kzalloc(attr->signature_size, GFP_KERNEL);
   180		if (!sig) {
   181			err = -ENOMEM;
   182			goto out;
   183		}
   184		err = copy_from_bpfptr(sig, usig, attr->signature_size);
   185		if (err != 0)
   186			goto cleanup_sig;
   187	
   188		msg = pkcs7_parse_message(sig, attr->signature_size);
   189		if (IS_ERR(msg)) {
   190			err = LSM_INT_VERDICT_BADSIG;
   191			goto cleanup_sig;
   192		}
   193	
 > 194		if (verify_pkcs7_message_sig(prog->insnsi, prog->len * sizeof(struct bpf_insn), msg,
   195					     VERIFY_USE_SECONDARY_KEYRING,
   196					     VERIFYING_BPF_SIGNATURE,
   197					     NULL, NULL)) {
   198			err = LSM_INT_VERDICT_UNKNOWNKEY;
   199			goto cleanup_msg;
   200		}
   201	
   202		if (pkcs7_get_authattr(msg, OID_hornet_data,
   203				       &authattrs, &authattrs_len) == -ENODATA) {
   204			err = LSM_INT_VERDICT_PARTIALSIG;
   205			goto cleanup_msg;
   206		}
   207	
   208		err = asn1_ber_decoder(&hornet_decoder, ctx, authattrs, authattrs_len);
   209		if (err < 0 || authattrs == NULL) {
   210			err = LSM_INT_VERDICT_BADSIG;
   211			goto cleanup_msg;
   212		}
   213	
   214		err = hornet_verify_hashes(&maps, ctx, prog);
   215	
   216	cleanup_msg:
   217		pkcs7_free_message(msg);
   218	cleanup_sig:
   219		kfree(sig);
   220	out:
   221		kfree(ctx);
   222		return err;
   223	}
   224	

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