Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/x86/kernel/ima_arch.c b/arch/x86/kernel/ima_arch.c
new file mode 100644
index 0000000..4d4f5d9
--- /dev/null
+++ b/arch/x86/kernel/ima_arch.c
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 IBM Corporation
+ */
+#include <linux/efi.h>
+#include <linux/module.h>
+#include <linux/ima.h>
+
+extern struct boot_params boot_params;
+
+static enum efi_secureboot_mode get_sb_mode(void)
+{
+ efi_char16_t efi_SecureBoot_name[] = L"SecureBoot";
+ efi_char16_t efi_SetupMode_name[] = L"SecureBoot";
+ efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
+ efi_status_t status;
+ unsigned long size;
+ u8 secboot, setupmode;
+
+ size = sizeof(secboot);
+
+ if (!efi_enabled(EFI_RUNTIME_SERVICES)) {
+ pr_info("ima: secureboot mode unknown, no efi\n");
+ return efi_secureboot_mode_unknown;
+ }
+
+ /* Get variable contents into buffer */
+ status = efi.get_variable(efi_SecureBoot_name, &efi_variable_guid,
+ NULL, &size, &secboot);
+ if (status == EFI_NOT_FOUND) {
+ pr_info("ima: secureboot mode disabled\n");
+ return efi_secureboot_mode_disabled;
+ }
+
+ if (status != EFI_SUCCESS) {
+ pr_info("ima: secureboot mode unknown\n");
+ return efi_secureboot_mode_unknown;
+ }
+
+ size = sizeof(setupmode);
+ status = efi.get_variable(efi_SetupMode_name, &efi_variable_guid,
+ NULL, &size, &setupmode);
+
+ if (status != EFI_SUCCESS) /* ignore unknown SetupMode */
+ setupmode = 0;
+
+ if (secboot == 0 || setupmode == 1) {
+ pr_info("ima: secureboot mode disabled\n");
+ return efi_secureboot_mode_disabled;
+ }
+
+ pr_info("ima: secureboot mode enabled\n");
+ return efi_secureboot_mode_enabled;
+}
+
+bool arch_ima_get_secureboot(void)
+{
+ static enum efi_secureboot_mode sb_mode;
+ static bool initialized;
+
+ if (!initialized && efi_enabled(EFI_BOOT)) {
+ sb_mode = boot_params.secure_boot;
+
+ if (sb_mode == efi_secureboot_mode_unset)
+ sb_mode = get_sb_mode();
+ initialized = true;
+ }
+
+ if (sb_mode == efi_secureboot_mode_enabled)
+ return true;
+ else
+ return false;
+}
+
+/* secureboot arch rules */
+static const char * const sb_arch_rules[] = {
+#if !IS_ENABLED(CONFIG_KEXEC_SIG)
+ "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig",
+#endif /* CONFIG_KEXEC_SIG */
+ "measure func=KEXEC_KERNEL_CHECK",
+#if !IS_ENABLED(CONFIG_MODULE_SIG)
+ "appraise func=MODULE_CHECK appraise_type=imasig",
+#endif
+ "measure func=MODULE_CHECK",
+ NULL
+};
+
+const char * const *arch_get_ima_policy(void)
+{
+ if (IS_ENABLED(CONFIG_IMA_ARCH_POLICY) && arch_ima_get_secureboot()) {
+ if (IS_ENABLED(CONFIG_MODULE_SIG))
+ set_module_sig_enforced();
+ return sb_arch_rules;
+ }
+ return NULL;
+}