diff options
| author | Nayna Jain <nayna@linux.ibm.com> | 2018-10-09 23:00:33 +0530 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2018-11-13 07:38:45 -0500 |
| commit | 0914ade209c452cff6a29b1c0ae6fff3167fa1d0 (patch) | |
| tree | 6fa55dce007fc83f4bb59ed5f4e2b33c4394997a | |
| parent | 59637d5e1693451b03d2979ffbe9d40423ef05d7 (diff) | |
x86/ima: define arch_ima_get_secureboot
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.ibm.com>
Suggested-by: Seth Forshee <seth.forshee@canonical.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
| -rw-r--r-- | arch/x86/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/ima_arch.c | 17 | ||||
| -rw-r--r-- | include/linux/ima.h | 9 |
3 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 8824d01c0c35..f0910a1e1db7 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -150,3 +150,5 @@ 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 97914a2833d1..948135fb60f1 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) { |