OvmfPkg: secure boot support for direct kernel boot (via shim) #6211
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kraxel
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Sep 17, 2024
kraxel
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- OvmfPkg/QemuKernelLoaderFsDxe: fetch kernel from etc/boot/kernel if present
- OvmfPkg/QemuKernelLoaderFsDxe: fetch shim.efi from etc/boot/shim if present
- OvmfPkg/X86QemuLoadImageLib: support booting via shim
- OvmfPkg/GenericQemuLoadImageLib: support booting via shim
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…resent Add support for loading blobs from fw_cfg files. For the kernel check whenever 'etc/boot/kernel' is present, should that be the case prefer it over the traditional kernel fw_cfg items. Newer qemu versions expose the kernel without setup header patches that way. Patching the setup header breaks secure boot verification, so avoiding that allows to use direct kernel boot with secure boot enabled. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
…resent In case the 'etc/boot/shim' fw_cfg file is present fetch that and store it as 'shim' in the kernel loader file system. Newer qemu versions allow to upload shim that way (via 'qemu -shim /path/to/shim.efi'). Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Try load shim first. In case that succeeded update the command line to list 'kernel' first so shim will fetch the kernel from the kernel loader file system. This allows to use direct kernel boot with distro kernels and secure boot enabled. Usually distro kernels can only be verified by distro shim using the distro keys compiled into the shim binary. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Try load shim first. In case that succeeded update the command line to list 'kernel' first so shim will fetch the kernel from the kernel loader file system. This allows to use direct kernel boot with distro kernels and secure boot enabled. Usually distro kernels can only be verified by distro shim using the distro keys compiled into the shim binary. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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