From: Nayna Jain <nayna@linux.vnet.ibm.com>
To: linux-integrity@vger.kernel.org
Cc: zohar@linux.ibm.com, linux-security-module@vger.kernel.org,
linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
dhowells@redhat.com, jforbes@redhat.com,
Nayna Jain <nayna@linux.vnet.ibm.com>
Subject: [PATCH v4 1/6] x86/ima: define arch_ima_get_secureboot
Date: Wed, 26 Sep 2018 17:52:05 +0530 [thread overview]
Message-ID: <20180926122210.14642-2-nayna@linux.vnet.ibm.com> (raw)
In-Reply-To: <20180926122210.14642-1-nayna@linux.vnet.ibm.com>
Distros are concerned about totally disabling the kexec_load syscall.
As a compromise, the kexec_load syscall will only be disabled when
CONFIG_KEXEC_VERIFY_SIG is configured and the system is booted with
secureboot enabled.
This patch defines the new arch specific function called
arch_ima_get_secureboot() to retrieve the secureboot state of the system.
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Suggested-by: Seth Forshee <seth.forshee@canonical.com>
---
arch/x86/kernel/Makefile | 2 ++
arch/x86/kernel/ima_arch.c | 17 +++++++++++++++++
include/linux/ima.h | 9 +++++++++
3 files changed, 28 insertions(+)
create mode 100644 arch/x86/kernel/ima_arch.c
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 02d6f5cf4e70..f32406e51424 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -149,3 +149,5 @@ ifeq ($(CONFIG_X86_64),y)
obj-$(CONFIG_MMCONF_FAM10H) += mmconf-fam10h_64.o
obj-y += vsmp_64.o
endif
+
+obj-$(CONFIG_IMA) += ima_arch.o
diff --git a/arch/x86/kernel/ima_arch.c b/arch/x86/kernel/ima_arch.c
new file mode 100644
index 000000000000..bb5a88d2b271
--- /dev/null
+++ b/arch/x86/kernel/ima_arch.c
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 IBM Corporation
+ */
+#include <linux/efi.h>
+#include <linux/ima.h>
+
+extern struct boot_params boot_params;
+
+bool arch_ima_get_secureboot(void)
+{
+ if (efi_enabled(EFI_BOOT) &&
+ (boot_params.secure_boot == efi_secureboot_mode_enabled))
+ return true;
+ else
+ return false;
+}
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 84806b54b50a..4852255aa4f4 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -30,6 +30,15 @@ extern void ima_post_path_mknod(struct dentry *dentry);
extern void ima_add_kexec_buffer(struct kimage *image);
#endif
+#ifdef CONFIG_X86
+extern bool arch_ima_get_secureboot(void);
+#else
+static inline bool arch_ima_get_secureboot(void)
+{
+ return false;
+}
+#endif
+
#else
static inline int ima_bprm_check(struct linux_binprm *bprm)
{
--
2.13.6
next prev parent reply other threads:[~2018-09-26 12:25 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-26 12:22 [PATCH v4 0/6] Add support for architecture specific IMA policies Nayna Jain
2018-09-26 12:22 ` Nayna Jain [this message]
2018-09-27 11:33 ` [PATCH v4 1/6] x86/ima: define arch_ima_get_secureboot Mimi Zohar
2018-09-26 12:22 ` [PATCH v4 2/6] ima: prevent kexec_load syscall based on runtime secureboot flag Nayna Jain
2018-09-27 11:33 ` Mimi Zohar
2018-09-26 12:22 ` [PATCH v4 3/6] ima: refactor ima_init_policy() Nayna Jain
2018-09-27 12:16 ` Mimi Zohar
2018-09-28 0:51 ` Mimi Zohar
2018-09-26 12:22 ` [PATCH v4 4/6] ima: add support for arch specific policies Nayna Jain
2018-09-27 13:27 ` Mimi Zohar
2018-09-26 12:22 ` [PATCH v4 5/6] ima: add support for external setting of ima_appraise Nayna Jain
2018-09-27 13:20 ` Mimi Zohar
2018-10-05 17:44 ` Nayna Jain
2018-09-26 12:22 ` [PATCH v4 6/6] x86/ima: define arch_get_ima_policy() for x86 Nayna Jain
2018-09-27 13:31 ` Mimi Zohar
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