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x86/ima: define arch_ima_get_secureboot

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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>
This commit is contained in:
Nayna Jain 2018-10-09 23:00:33 +05:30 committed by Mimi Zohar
parent 59637d5e16
commit 0914ade209
3 changed files with 28 additions and 0 deletions
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2
arch/x86/kernel/Makefile
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@ -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

17
arch/x86/kernel/ima_arch.c Normal file
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@ -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;
}

9
include/linux/ima.h
View File

@ -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)
{