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| author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2018-11-15 14:52:54 +0900 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-06 15:16:52 +0000 |
| commit | 732b7b93d849f8a44886ead563dfb6adec7f4419 (patch) | |
| tree | 29ec906b45eaec73cae4102a360dd7fea7f9198c /arch/arm64/Kconfig | |
| parent | 702ed5bb75306c030ab6598b24b56ba8d21a48dd (diff) | |
| download | lwn-732b7b93d849f8a44886ead563dfb6adec7f4419.tar.gz lwn-732b7b93d849f8a44886ead563dfb6adec7f4419.zip | |
arm64: kexec_file: add kernel signature verification support
With this patch, kernel verification can be done without IMA security
subsystem enabled. Turn on CONFIG_KEXEC_VERIFY_SIG instead.
On x86, a signature is embedded into a PE file (Microsoft's format) header
of binary. Since arm64's "Image" can also be seen as a PE file as far as
CONFIG_EFI is enabled, we adopt this format for kernel signing.
You can create a signed kernel image with:
$ sbsign --key ${KEY} --cert ${CERT} Image
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
[will: removed useless pr_debug()]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 93dc4d36d6db..11f3e1a00588 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -867,6 +867,30 @@ config KEXEC_FILE for kernel and initramfs as opposed to list of segments as accepted by previous system call. +config KEXEC_VERIFY_SIG + bool "Verify kernel signature during kexec_file_load() syscall" + depends on KEXEC_FILE + help + Select this option to verify a signature with loaded kernel + image. If configured, any attempt of loading a image without + valid signature will fail. + + In addition to that option, you need to enable signature + verification for the corresponding kernel image type being + loaded in order for this to work. + +config KEXEC_IMAGE_VERIFY_SIG + bool "Enable Image signature verification support" + default y + depends on KEXEC_VERIFY_SIG + depends on EFI && SIGNED_PE_FILE_VERIFICATION + help + Enable Image signature verification support. + +comment "Support for PE file signature verification disabled" + depends on KEXEC_VERIFY_SIG + depends on !EFI || !SIGNED_PE_FILE_VERIFICATION + config CRASH_DUMP bool "Build kdump crash kernel" help |