// SPDX-License-Identifier: GPL-2.0-or-later #include <linux/kernel.h>#include <linux/key.h>#include "common.h" int load_certificate_list(const u8 cert_list[],			  const unsigned long list_size,			  const struct key *keyring){	key_ref_t key;	const u8 *p, *end;	size_t plen; 	p = cert_list;	end = p + list_size;	while (p < end) {		/* Each cert begins with an ASN.1 SEQUENCE tag and must be more		 * than 256 bytes in size.		 */		if (end - p < 4)			goto dodgy_cert;		if (p[0] != 0x30 &&		    p[1] != 0x82)			goto dodgy_cert;		plen = (p[2] << 8) | p[3];		plen += 4;		if (plen > end - p)			goto dodgy_cert; 		key = key_create_or_update(make_key_ref(keyring, 1),					   "asymmetric",					   NULL,					   p,					   plen,					   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |					   KEY_USR_VIEW | KEY_USR_READ),					   KEY_ALLOC_NOT_IN_QUOTA |					   KEY_ALLOC_BUILT_IN |					   KEY_ALLOC_BYPASS_RESTRICTION);		if (IS_ERR(key)) {			pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",			       PTR_ERR(key));		} else {			pr_notice("Loaded X.509 cert '%s'\n",				  key_ref_to_ptr(key)->description);			key_ref_put(key);		}		p += plen;	} 	return 0; dodgy_cert:	pr_err("Problem parsing in-kernel X.509 certificate list\n");	return 0;}