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OvmfPkg/X86QemuLoadImageLib: support booting via shim 

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>
This commit is contained in:
Gerd Hoffmann 2024-04-10 17:25:03 +02:00 committed by Ard Biesheuvel
parent c45051450e
commit 3da39f2cb6
1 changed files with 54 additions and 2 deletions
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56
OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c
View File

@ -57,6 +57,25 @@ STATIC CONST KERNEL_VENMEDIA_FILE_DEVPATH mKernelDevicePath = {
}
};
STATIC CONST KERNEL_VENMEDIA_FILE_DEVPATH mShimDevicePath = {
{
{
MEDIA_DEVICE_PATH, MEDIA_VENDOR_DP,
{ sizeof (VENDOR_DEVICE_PATH) }
},
QEMU_KERNEL_LOADER_FS_MEDIA_GUID
}, {
{
MEDIA_DEVICE_PATH, MEDIA_FILEPATH_DP,
{ sizeof (KERNEL_FILE_DEVPATH) }
},
L"shim",
}, {
END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE,
{ sizeof (EFI_DEVICE_PATH_PROTOCOL) }
}
};
STATIC
VOID
FreeLegacyImage (
@ -339,6 +358,7 @@ QemuLoadKernelImage (
UINTN CommandLineSize;
CHAR8 *CommandLine;
UINTN InitrdSize;
BOOLEAN Shim;
//
// Redundant assignment to work around GCC48/GCC49 limitations.
@ -351,11 +371,35 @@ QemuLoadKernelImage (
Status = gBS->LoadImage (
FALSE, // BootPolicy: exact match required
gImageHandle, // ParentImageHandle
(EFI_DEVICE_PATH_PROTOCOL *)&mKernelDevicePath,
(EFI_DEVICE_PATH_PROTOCOL *)&mShimDevicePath,
NULL, // SourceBuffer
0, // SourceSize
&KernelImageHandle
);
if (Status == EFI_SUCCESS) {
Shim = TRUE;
DEBUG ((DEBUG_INFO, "%a: booting via shim\n", __func__));
} else {
Shim = FALSE;
if (Status == EFI_SECURITY_VIOLATION) {
gBS->UnloadImage (KernelImageHandle);
}
if (Status != EFI_NOT_FOUND) {
DEBUG ((DEBUG_INFO, "%a: LoadImage(shim): %r\n", __func__, Status));
return Status;
}
Status = gBS->LoadImage (
FALSE, // BootPolicy: exact match required
gImageHandle, // ParentImageHandle
(EFI_DEVICE_PATH_PROTOCOL *)&mKernelDevicePath,
NULL, // SourceBuffer
0, // SourceSize
&KernelImageHandle
);
}
switch (Status) {
case EFI_SUCCESS:
break;
@ -465,6 +509,13 @@ QemuLoadKernelImage (
KernelLoadedImage->LoadOptionsSize += sizeof (L" initrd=initrd") - 2;
}
if (Shim) {
//
// Prefix 'kernel ' in UTF-16.
//
KernelLoadedImage->LoadOptionsSize += sizeof (L"kernel ") - 2;
}
if (KernelLoadedImage->LoadOptionsSize == 0) {
KernelLoadedImage->LoadOptions = NULL;
} else {
@ -485,7 +536,8 @@ QemuLoadKernelImage (
UnicodeSPrintAsciiFormat (
KernelLoadedImage->LoadOptions,
KernelLoadedImage->LoadOptionsSize,
"%a%a",
"%a%a%a",
(Shim == FALSE) ? "" : "kernel ",
(CommandLineSize == 0) ? "" : CommandLine,
(InitrdSize == 0) ? "" : " initrd=initrd"
);