[PATCH v4 1/6] x86/ima: define arch_ima_get_secureboot
From: zohar@linux.ibm.com (Mimi Zohar)
Date: 2018-09-27 11:33:22
Also in:
kexec, linux-efi, linux-integrity, lkml
[Cc'ing the kexec mailing list, and Seth] On Wed, 2018-09-26 at 17:52 +0530, Nayna Jain wrote:
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 <redacted> Suggested-by: Seth Forshee <redacted>
Nice! Mimi
quoted hunk ↗ jump to hunk
--- 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.cdiff --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.odiff --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) {