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-rw-r--r--security/integrity/ima/ima_efi.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/security/integrity/ima/ima_efi.c b/security/integrity/ima/ima_efi.c
new file mode 100644
index 000000000..9db66fe31
--- /dev/null
+++ b/security/integrity/ima/ima_efi.c
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 IBM Corporation
+ */
+#include <linux/efi.h>
+#include <linux/module.h>
+#include <linux/ima.h>
+#include <asm/efi.h>
+
+#ifndef arch_ima_efi_boot_mode
+#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
+#endif
+
+static enum efi_secureboot_mode get_sb_mode(void)
+{
+ enum efi_secureboot_mode mode;
+
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) {
+ pr_info("ima: secureboot mode unknown, no efi\n");
+ return efi_secureboot_mode_unknown;
+ }
+
+ mode = efi_get_secureboot_mode(efi.get_variable);
+ if (mode == efi_secureboot_mode_disabled)
+ pr_info("ima: secureboot mode disabled\n");
+ else if (mode == efi_secureboot_mode_unknown)
+ pr_info("ima: secureboot mode unknown\n");
+ else
+ pr_info("ima: secureboot mode enabled\n");
+ return mode;
+}
+
+bool arch_ima_get_secureboot(void)
+{
+ static enum efi_secureboot_mode sb_mode;
+ static bool initialized;
+
+ if (!initialized && efi_enabled(EFI_BOOT)) {
+ sb_mode = arch_ima_efi_boot_mode;
+
+ 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();
+ if (IS_ENABLED(CONFIG_KEXEC_SIG))
+ set_kexec_sig_enforced();
+ return sb_arch_rules;
+ }
+ return NULL;
+}