proxmox-mirrors/efi-boot-shim
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Make shim use fallback when appropriate.

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If we're called as /BOOT/EFI/BOOT*.EFI, and /BOOT/EFI/FALLBACK.EFI exists,
give it a shot.

Signed-off-by: Peter Jones <pjones@redhat.com>
This commit is contained in:
Peter Jones 2013-04-26 12:14:51 -04:00
parent 3ce517fdbb
commit a24d3ba3bd
1 changed files with 68 additions and 1 deletions
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69
shim.c
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@ -44,6 +44,7 @@
#include "ucs2.h"
#define DEFAULT_LOADER L"\\grub.efi"
#define FALLBACK L"\\fallback.efi"
#define MOK_MANAGER L"\\MokManager.efi"
static EFI_SYSTEM_TABLE *systab;
@ -899,6 +900,69 @@ static EFI_STATUS handle_image (void *data, unsigned int datasize,
return EFI_SUCCESS;
}
static int
should_use_fallback(EFI_HANDLE image_handle)
{
EFI_GUID loaded_image_protocol = LOADED_IMAGE_PROTOCOL;
EFI_LOADED_IMAGE *li;
EFI_DEVICE_PATH *devpath;
int i;
unsigned int pathlen = 0;
CHAR16 *bootpath;
EFI_FILE_IO_INTERFACE *fio = NULL;
EFI_FILE_HANDLE vh;
EFI_FILE_HANDLE fh;
EFI_STATUS rc;
rc = uefi_call_wrapper(BS->HandleProtocol, 3, image_handle,
&loaded_image_protocol, (void **)&li);
if (EFI_ERROR(rc))
return 0;
devpath = li->FilePath;
bootpath = DevicePathToStr(devpath);
/* Check the beginning of the string and the end, to avoid
* caring about which arch this is. */
/* I really don't know why, but sometimes bootpath gives us
* L"\\EFI\\BOOT\\/BOOTX64.EFI". So just handle that here...
*/
if (StrnCaseCmp(bootpath, L"\\EFI\\BOOT\\BOOT", 14) &&
StrnCaseCmp(bootpath, L"\\EFI\\BOOT\\/BOOT", 15))
return 0;
pathlen = StrLen(bootpath);
if (pathlen < 5 || StrCaseCmp(bootpath + pathlen - 4, L".EFI"))
return 0;
for (i=pathlen; i>0; i--) {
if (bootpath[i] == '\\')
break;
}
bootpath[i+1] = '\0';
rc = uefi_call_wrapper(BS->HandleProtocol, 3, li->DeviceHandle,
&FileSystemProtocol, &fio);
if (EFI_ERROR(rc))
return 0;
rc = uefi_call_wrapper(fio->OpenVolume, 2, fio, &vh);
if (EFI_ERROR(rc))
return 0;
rc = uefi_call_wrapper(vh->Open, 5, vh, &fh, L"\\EFI\\BOOT" FALLBACK,
EFI_FILE_READ_ONLY, 0);
if (EFI_ERROR(rc)) {
uefi_call_wrapper(vh->Close, 1, vh);
return 0;
}
uefi_call_wrapper(fh->Close, 1, fh);
uefi_call_wrapper(vh->Close, 1, vh);
return 1;
}
/*
* Generate the path of an executable given shim's path and the name
* of the executable
@ -1202,7 +1266,10 @@ EFI_STATUS init_grub(EFI_HANDLE image_handle)
{
EFI_STATUS efi_status;
efi_status = start_image(image_handle, second_stage);
if (should_use_fallback(image_handle))
efi_status = start_image(image_handle, FALLBACK);
else
efi_status = start_image(image_handle, second_stage);
if (efi_status != EFI_SUCCESS)
efi_status = start_image(image_handle, MOK_MANAGER);