// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2019 IBM Corporation * Author: Nayna Jain */ #include <linux/ima.h>#include <asm/secure_boot.h> /* * The "secure_rules" are enabled only on "secureboot" enabled systems. * These rules verify the file signatures against known good values. * The "appraise_type=imasig|modsig" option allows the known good signature * to be stored as an xattr or as an appended signature. * * To avoid duplicate signature verification as much as possible, the IMA * policy rule for module appraisal is added only if CONFIG_MODULE_SIG * is not enabled. */static const char *const secure_rules[] = {	"appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig|modsig",#ifndef CONFIG_MODULE_SIG	"appraise func=MODULE_CHECK appraise_type=imasig|modsig",#endif	NULL}; /* * The "trusted_rules" are enabled only on "trustedboot" enabled systems. * These rules add the kexec kernel image and kernel modules file hashes to * the IMA measurement list. */static const char *const trusted_rules[] = {	"measure func=KEXEC_KERNEL_CHECK",	"measure func=MODULE_CHECK",	NULL}; /* * The "secure_and_trusted_rules" contains rules for both the secure boot and * trusted boot. The "template=ima-modsig" option includes the appended * signature, when available, in the IMA measurement list. */static const char *const secure_and_trusted_rules[] = {	"measure func=KEXEC_KERNEL_CHECK template=ima-modsig",	"measure func=MODULE_CHECK template=ima-modsig",	"appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig|modsig",#ifndef CONFIG_MODULE_SIG	"appraise func=MODULE_CHECK appraise_type=imasig|modsig",#endif	NULL}; /* * Returns the relevant IMA arch-specific policies based on the system secure * boot state. */const char *const *arch_get_ima_policy(void){	if (is_ppc_secureboot_enabled()) {		set_module_sig_enforced(); 		if (is_ppc_trustedboot_enabled())			return secure_and_trusted_rules;		else			return secure_rules;	} else if (is_ppc_trustedboot_enabled()) {		return trusted_rules;	} 	return NULL;}