[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 <na...@linux.vnet.ibm.com>
> Suggested-by: Seth Forshee <seth.fors...@canonical.com>
Nice!
Mimi
> ---
> 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)
> {
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