Re: [PATCH V3 11/11] Add option to automatically enforce modulesignatures when in Secure Boot mode

From: joeyli
Date: Thu Sep 05 2013 - 04:23:49 EST


æ äï2013-09-03 æ 19:50 -0400ïMatthew Garrett æåï
> UEFI Secure Boot provides a mechanism for ensuring that the firmware will
> only load signed bootloaders and kernels. Certain use cases may also
> require that all kernel modules also be signed. Add a configuration option
> that enforces this automatically when enabled.
>
> Signed-off-by: Matthew Garrett <matthew.garrett@xxxxxxxxxx>
> ---
> Documentation/x86/zero-page.txt | 2 ++
> arch/x86/Kconfig | 10 ++++++++++
> arch/x86/boot/compressed/eboot.c | 36 +++++++++++++++++++++++++++++++++++
> arch/x86/include/uapi/asm/bootparam.h | 3 ++-
> arch/x86/kernel/setup.c | 6 ++++++
> include/linux/module.h | 6 ++++++
> kernel/module.c | 7 +++++++
> 7 files changed, 69 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/x86/zero-page.txt b/Documentation/x86/zero-page.txt
> index 199f453..ec38acf 100644
> --- a/Documentation/x86/zero-page.txt
> +++ b/Documentation/x86/zero-page.txt
> @@ -30,6 +30,8 @@ Offset Proto Name Meaning
> 1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below)
> 1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer
> (below)
> +1EB/001 ALL kbd_status Numlock is enabled
> +1EC/001 ALL secure_boot Secure boot is enabled in the firmware
> 1EF/001 ALL sentinel Used to detect broken bootloaders
> 290/040 ALL edd_mbr_sig_buffer EDD MBR signatures
> 2D0/A00 ALL e820_map E820 memory map table
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index b32ebf9..6a6c19b 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1581,6 +1581,16 @@ config EFI_STUB
>
> See Documentation/x86/efi-stub.txt for more information.
>
> +config EFI_SECURE_BOOT_SIG_ENFORCE
> + def_bool n

Maybe need add "select MODULE_SIG" to here for auto enable kernel module
signature check when user select this option?

> + prompt "Force module signing when UEFI Secure Boot is enabled"
> + ---help---
> + UEFI Secure Boot provides a mechanism for ensuring that the
> + firmware will only load signed bootloaders and kernels. Certain
> + use cases may also require that all kernel modules also be signed.
> + Say Y here to automatically enable module signature enforcement
> + when a system boots with UEFI Secure Boot enabled.

Thanks a lot!
Joey Lee

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