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Subject[PATCH 0/3] kexec: refactor CONFIG_KEXEC/CONFIG_KEXEC_FILE Kconfig
Previously Theodore Ts'o brought up an issue about kexec_load syscall bypassing
signature verification:
https://lkml.org/lkml/2015/6/14/280

Because we have two kexec load syscall, one kexec_load, another kexec_file_load,
the latter one was introduced by Vivek Goyal, it is mainly for supporting UEFI
secure boot. kexec_file_load verifies kernel signature, but even if with
CONFIG_KEXEC_VERIFY_SIG=y and CONFIG_KEXEC_FILE=y, kexec-tools still can use
old syscall and bypass signature verification.

KEXEC_FILE can also be used without UEFI, so kexec can always verify kernel
signature for security purpose.

The suggestion in above thread is add a new Kconfig option for kexec common
code, here I use KEXEC_CORE, KEXEC and KEXEC_FILE select KEXEC_CORE so one can
compile only KEXEC_FILE without old kexec_load syscall.

There's checkpatch warnings and errors, I would like to send furthuer cleanup
patches after this series. Please let me know if you have other suggestions.
checkpatch errors are for cases such as assign a value to static variables.

PATCH 3/3 can be sort out from the series if people do not like. It is a
cleanup for a macro.

Below is the diffstat of the patches:
---
arch/arm/Kconfig | 4
arch/ia64/Kconfig | 4
arch/m68k/Kconfig | 4
arch/mips/Kconfig | 4
arch/powerpc/Kconfig | 4
arch/sh/Kconfig | 4
arch/tile/Kconfig | 4
arch/x86/Kconfig | 6
arch/x86/boot/header.S | 2
arch/x86/include/asm/kdebug.h | 5
arch/x86/kernel/Makefile | 4
arch/x86/kernel/kvmclock.c | 4
arch/x86/kernel/reboot.c | 4
arch/x86/kernel/setup.c | 2
arch/x86/kernel/vmlinux.lds.S | 2
arch/x86/kvm/vmx.c | 8
arch/x86/platform/efi/efi.c | 4
arch/x86/platform/uv/uv_nmi.c | 6
drivers/firmware/efi/Kconfig | 2
drivers/pci/pci-driver.c | 2
include/linux/kexec.h | 12
init/initramfs.c | 4
kernel/Makefile | 2
kernel/events/core.c | 2
kernel/kexec.c | 2633 ------------------------------------------
kernel/kexec_core.c | 1594 +++++++++++++++++++++++++
kernel/kexec_file.c | 1044 ++++++++++++++++
kernel/kexec_internal.h | 22
kernel/ksysfs.c | 6
kernel/printk/printk.c | 2
kernel/reboot.c | 2
kernel/sysctl.c | 2
32 files changed, 2745 insertions(+), 2659 deletions(-)

Thanks
Dave



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