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SubjectRe: [PATCH 06/27] Copy secure_boot flag in boot params across kexec reboot
On Thu, Oct 19, 2017 at 03:51:20PM +0100, David Howells wrote:
> From: Dave Young <dyoung@redhat.com>
>
> Kexec reboot in case secure boot being enabled does not keep the secure
> boot mode in new kernel, so later one can load unsigned kernel via legacy
> kexec_load. In this state, the system is missing the protections provided
> by secure boot.
>
> Adding a patch to fix this by retain the secure_boot flag in original
> kernel.
>
> secure_boot flag in boot_params is set in EFI stub, but kexec bypasses the
> stub. Fixing this issue by copying secure_boot flag across kexec reboot.
>
> Signed-off-by: Dave Young <dyoung@redhat.com>
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: kexec@lists.infradead.org

I have reviewed and tested this patch. Please feel free to add:

Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com>

Thanks a lot!
Joey Lee

> ---
>
> arch/x86/kernel/kexec-bzimage64.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
> index fb095ba0c02f..7d0fac5bcbbe 100644
> --- a/arch/x86/kernel/kexec-bzimage64.c
> +++ b/arch/x86/kernel/kexec-bzimage64.c
> @@ -179,6 +179,7 @@ setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
> if (efi_enabled(EFI_OLD_MEMMAP))
> return 0;
>
> + params->secure_boot = boot_params.secure_boot;
> ei->efi_loader_signature = current_ei->efi_loader_signature;
> ei->efi_systab = current_ei->efi_systab;
> ei->efi_systab_hi = current_ei->efi_systab_hi;
>
> --
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