Merge tag 'integrity-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity

Pull integrity subsystem updates from Mimi Zohar:
 "The few changes are all kexec related:

   - The MOK keys are loaded onto the .platform keyring in order to
     verify the kexec kernel image signature.

     However, the MOK keys should only be trusted when secure boot is
     enabled. Before loading the MOK keys onto the .platform keyring,
     make sure the system is booted in secure boot mode.

   - When carrying the IMA measurement list across kexec, limit dumping
     the measurement list to when dynamic debug or CONFIG_DEBUG is
     enabled.

   - kselftest: add kexec_file_load selftest support for PowerNV and
     other cleanup"

* tag 'integrity-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
  selftests/kexec: Enable secureboot tests for PowerPC
  ima: silence measurement list hexdump during kexec
  selftests/kexec: update searching for the Kconfig
  selftest/kexec: fix "ignored null byte in input" warning
  integrity: Do not load MOK and MOKx when secure boot be disabled
  ima: Fix undefined arch_ima_get_secureboot() and co

6 files changed, 74 insertions, 33 deletions

diff --git a/include/linux/ima.h b/include/linux/ima.h
index b6ab66a546ae..426b1744215e 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -50,21 +50,6 @@ static inline void ima_appraise_parse_cmdline(void) {}
 extern void ima_add_kexec_buffer(struct kimage *image);
 #endif
 
-#ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
-extern bool arch_ima_get_secureboot(void);
-extern const char * const *arch_get_ima_policy(void);
-#else
-static inline bool arch_ima_get_secureboot(void)
-{
-	return false;
-}
-
-static inline const char * const *arch_get_ima_policy(void)
-{
-	return NULL;
-}
-#endif
-
 #else
 static inline enum hash_algo ima_get_current_hash_algo(void)
 {
@@ -155,6 +140,21 @@ static inline int ima_measure_critical_data(const char *event_label,
 
 #endif /* CONFIG_IMA */
 
+#ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
+extern bool arch_ima_get_secureboot(void);
+extern const char * const *arch_get_ima_policy(void);
+#else
+static inline bool arch_ima_get_secureboot(void)
+{
+	return false;
+}
+
+static inline const char * const *arch_get_ima_policy(void)
+{
+	return NULL;
+}
+#endif
+
 #ifndef CONFIG_IMA_KEXEC
 struct kimage;
 
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index f799cc278a9a..13753136f03f 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -61,9 +61,9 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
 	}
 	memcpy(file.buf, &khdr, sizeof(khdr));
 
-	print_hex_dump(KERN_DEBUG, "ima dump: ", DUMP_PREFIX_NONE,
-			16, 1, file.buf,
-			file.count < 100 ? file.count : 100, true);
+	print_hex_dump_debug("ima dump: ", DUMP_PREFIX_NONE, 16, 1,
+			     file.buf, file.count < 100 ? file.count : 100,
+			     true);
 
 	*buffer_size = file.count;
 	*buffer = file.buf;
diff --git a/security/integrity/platform_certs/load_uefi.c b/security/integrity/platform_certs/load_uefi.c
index f290f78c3f30..08b6d12f99b4 100644
--- a/security/integrity/platform_certs/load_uefi.c
+++ b/security/integrity/platform_certs/load_uefi.c
@@ -6,6 +6,7 @@
 #include <linux/err.h>
 #include <linux/efi.h>
 #include <linux/slab.h>
+#include <linux/ima.h>
 #include <keys/asymmetric-type.h>
 #include <keys/system_keyring.h>
 #include "../integrity.h"
@@ -176,6 +177,10 @@ static int __init load_uefi_certs(void)
 		kfree(dbx);
 	}
 
+	/* the MOK/MOKx can not be trusted when secure boot is disabled */
+	if (!arch_ima_get_secureboot())
+		return 0;
+
 	mokx = get_cert_list(L"MokListXRT", &mok_var, &mokxsize, &status);
 	if (!mokx) {
 		if (status == EFI_NOT_FOUND)
diff --git a/tools/testing/selftests/kexec/Makefile b/tools/testing/selftests/kexec/Makefile
index aa91d2063249..806a150648c3 100644
--- a/tools/testing/selftests/kexec/Makefile
+++ b/tools/testing/selftests/kexec/Makefile
@@ -4,7 +4,7 @@
 uname_M := $(shell uname -m 2>/dev/null || echo not)
 ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
 
-ifeq ($(ARCH),x86)
+ifeq ($(ARCH),$(filter $(ARCH),x86 ppc64le))
 TEST_PROGS := test_kexec_load.sh test_kexec_file_load.sh
 TEST_FILES := kexec_common_lib.sh
 
diff --git a/tools/testing/selftests/kexec/kexec_common_lib.sh b/tools/testing/selftests/kexec/kexec_common_lib.sh
index 43017cfe88f7..0e114b34d5d7 100755
--- a/tools/testing/selftests/kexec/kexec_common_lib.sh
+++ b/tools/testing/selftests/kexec/kexec_common_lib.sh
@@ -91,6 +91,27 @@ get_efi_var_secureboot_mode()
 	return 0;
 }
 
+# On powerpc platform, check device-tree property
+# /proc/device-tree/ibm,secureboot/os-secureboot-enforcing
+# to detect secureboot state.
+get_ppc64_secureboot_mode()
+{
+	local secure_boot_file="/proc/device-tree/ibm,secureboot/os-secureboot-enforcing"
+	# Check for secure boot file existence
+	if [ -f $secure_boot_file ]; then
+		log_info "Secureboot is enabled (Device tree)"
+		return 1;
+	fi
+	log_info "Secureboot is not enabled (Device tree)"
+	return 0;
+}
+
+# Return the architecture of the system
+get_arch()
+{
+	echo $(arch)
+}
+
 # Check efivar SecureBoot-$(the UUID) and SetupMode-$(the UUID).
 # The secure boot mode can be accessed either as the last integer
 # of "od -An -t u1 /sys/firmware/efi/efivars/SecureBoot-*" or from
@@ -100,14 +121,19 @@ get_efi_var_secureboot_mode()
 get_secureboot_mode()
 {
 	local secureboot_mode=0
+	local system_arch=$(get_arch)
 
-	get_efivarfs_secureboot_mode
-	secureboot_mode=$?
-
-	# fallback to using the efi_var files
-	if [ $secureboot_mode -eq 0 ]; then
-		get_efi_var_secureboot_mode
+	if [ "$system_arch" == "ppc64le" ]; then
+		get_ppc64_secureboot_mode
+		secureboot_mode=$?
+	else
+		get_efivarfs_secureboot_mode
 		secureboot_mode=$?
+		# fallback to using the efi_var files
+		if [ $secureboot_mode -eq 0 ]; then
+			get_efi_var_secureboot_mode
+			secureboot_mode=$?
+		fi
 	fi
 
 	if [ $secureboot_mode -eq 0 ]; then
@@ -138,15 +164,20 @@ kconfig_enabled()
 	return 0
 }
 
-# Attempt to get the kernel config first via proc, and then by
-# extracting it from the kernel image or the configs.ko using
-# scripts/extract-ikconfig.
+# Attempt to get the kernel config first by checking the modules directory
+# then via proc, and finally by extracting it from the kernel image or the
+# configs.ko using scripts/extract-ikconfig.
 # Return 1 for found.
 get_kconfig()
 {
 	local proc_config="/proc/config.gz"
 	local module_dir="/lib/modules/`uname -r`"
-	local configs_module="$module_dir/kernel/kernel/configs.ko"
+	local configs_module="$module_dir/kernel/kernel/configs.ko*"
+
+	if [ -f $module_dir/config ]; then
+		IKCONFIG=$module_dir/config
+		return 1
+	fi
 
 	if [ ! -f $proc_config ]; then
 		modprobe configs > /dev/null 2>&1
diff --git a/tools/testing/selftests/kexec/test_kexec_file_load.sh b/tools/testing/selftests/kexec/test_kexec_file_load.sh
index 2ff600388c30..c9ccb3c93d72 100755
--- a/tools/testing/selftests/kexec/test_kexec_file_load.sh
+++ b/tools/testing/selftests/kexec/test_kexec_file_load.sh
@@ -97,10 +97,11 @@ check_for_imasig()
 check_for_modsig()
 {
 	local module_sig_string="~Module signature appended~"
-	local sig="$(tail --bytes $((${#module_sig_string} + 1)) $KERNEL_IMAGE)"
 	local ret=0
 
-	if [ "$sig" == "$module_sig_string" ]; then
+	tail --bytes $((${#module_sig_string} + 1)) $KERNEL_IMAGE | \
+		grep -q "$module_sig_string"
+	if [ $? -eq 0 ]; then
 		ret=1
 		log_info "kexec kernel image modsig signed"
 	else
@@ -225,8 +226,12 @@ get_secureboot_mode
 secureboot=$?
 
 # Are there pe and ima signatures
-check_for_pesig
-pe_signed=$?
+if [ "$(get_arch)" == 'ppc64le' ]; then
+	pe_signed=0
+else
+	check_for_pesig
+	pe_signed=$?
+fi
 
 check_for_imasig
 ima_signed=$?