powerpc: Load firmware trusted keys/hashes into kernel keyring (8220e22d) · Commits · 戴 / test

security/integrity/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -72,6 +72,15 @@ config LOAD_IPL_KEYS
		depends on S390
		def_bool y

		config LOAD_PPC_KEYS
		bool "Enable loading of platform and blacklisted keys for POWER"
		depends on INTEGRITY_PLATFORM_KEYRING
		depends on PPC_SECURE_BOOT
		default y
		help
		Enable loading of keys to the .platform keyring and blacklisted
		hashes to the .blacklist keyring for powerpc based platforms.

		config INTEGRITY_AUDIT
		bool "Enables integrity auditing support "
		depends on AUDIT

security/integrity/Makefile

+3 −1

Original line number	Diff line number	Diff line
		@@ -14,6 +14,8 @@ integrity-$(CONFIG_LOAD_UEFI_KEYS) += platform_certs/efi_parser.o \
		platform_certs/load_uefi.o \
		platform_certs/keyring_handler.o
		integrity-$(CONFIG_LOAD_IPL_KEYS) += platform_certs/load_ipl_s390.o

		integrity-$(CONFIG_LOAD_PPC_KEYS) += platform_certs/efi_parser.o \
		platform_certs/load_powerpc.o \
		platform_certs/keyring_handler.o
		obj-$(CONFIG_IMA) += ima/
		obj-$(CONFIG_EVM) += evm/

security/integrity/platform_certs/load_powerpc.c

0 → 100644

+96 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (C) 2019 IBM Corporation
		* Author: Nayna Jain
		*
		* - loads keys and hashes stored and controlled by the firmware.
		*/
		#include <linux/kernel.h>
		#include <linux/sched.h>
		#include <linux/cred.h>
		#include <linux/err.h>
		#include <linux/slab.h>
		#include <linux/of.h>
		#include <asm/secure_boot.h>
		#include <asm/secvar.h>
		#include "keyring_handler.h"

		/*
		* Get a certificate list blob from the named secure variable.
		*/
		static __init void get_cert_list(u8 key, unsigned long keylen, uint64_t *size)
		{
		int rc;
		void *db;

		rc = secvar_ops->get(key, keylen, NULL, size);
		if (rc) {
		pr_err("Couldn't get size: %d\n", rc);
		return NULL;
		}

		db = kmalloc(*size, GFP_KERNEL);
		if (!db)
		return NULL;

		rc = secvar_ops->get(key, keylen, db, size);
		if (rc) {
		kfree(db);
		pr_err("Error reading %s var: %d\n", key, rc);
		return NULL;
		}

		return db;
		}

		/*
		* Load the certs contained in the keys databases into the platform trusted
		* keyring and the blacklisted X.509 cert SHA256 hashes into the blacklist
		* keyring.
		*/
		static int __init load_powerpc_certs(void)
		{
		void db = NULL, dbx = NULL;
		uint64_t dbsize = 0, dbxsize = 0;
		int rc = 0;
		struct device_node *node;

		if (!secvar_ops)
		return -ENODEV;

		/* The following only applies for the edk2-compat backend. */
		node = of_find_compatible_node(NULL, NULL, "ibm,edk2-compat-v1");
		if (!node)
		return -ENODEV;

		/*
		* Get db, and dbx. They might not exist, so it isn't an error if we
		* can't get them.
		*/
		db = get_cert_list("db", 3, &dbsize);
		if (!db) {
		pr_err("Couldn't get db list from firmware\n");
		} else {
		rc = parse_efi_signature_list("powerpc:db", db, dbsize,
		get_handler_for_db);
		if (rc)
		pr_err("Couldn't parse db signatures: %d\n", rc);
		kfree(db);
		}

		dbx = get_cert_list("dbx", 4, &dbxsize);
		if (!dbx) {
		pr_info("Couldn't get dbx list from firmware\n");
		} else {
		rc = parse_efi_signature_list("powerpc:dbx", dbx, dbxsize,
		get_handler_for_dbx);
		if (rc)
		pr_err("Couldn't parse dbx signatures: %d\n", rc);
		kfree(dbx);
		}

		of_node_put(node);

		return rc;
		}
		late_initcall(load_powerpc_certs);

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