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    Subject[PATCH v3 1/6] x86/ima: define arch_ima_get_secureboot
    Date
    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
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