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Install a protocol for sharing code with grub

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This commit is contained in:
Matthew Garrett 2012-06-05 10:52:30 -04:00
parent d0410b583e
commit f4b2473401
2 changed files with 44 additions and 3 deletions
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32
shim.c
View File

@ -37,6 +37,7 @@
#include <efilib.h>
#include <Library/BaseCryptLib.h>
#include "PeImage.h"
#include "shim.h"
#define SECOND_STAGE L"grub.efi"
@ -167,8 +168,8 @@ static EFI_STATUS relocate_grub (PE_COFF_LOADER_IMAGE_CONTEXT *context,
/*
* Check that the signature is valid and matches the binary
*/
static EFI_STATUS verify_grub (PE_COFF_LOADER_IMAGE_CONTEXT *context,
char *grubdata, int grubsize)
static EFI_STATUS verify_grub (char *grubdata, int grubsize,
PE_COFF_LOADER_IMAGE_CONTEXT *context)
{
unsigned int size = grubsize;
unsigned int ctxsize;
@ -413,7 +414,7 @@ static EFI_STATUS handle_grub (void *grubdata, int grubsize)
return efi_status;
}
efi_status = verify_grub(&context, grubdata, grubsize);
efi_status = verify_grub(grubdata, grubsize, &context);
if (efi_status != EFI_SUCCESS) {
Print(L"Verification failed\n");
@ -637,16 +638,41 @@ static EFI_STATUS load_grub (EFI_HANDLE image_handle, void **grubdata,
return EFI_SUCCESS;
}
EFI_STATUS verify_buffer (void *buffer, int size)
{
EFI_STATUS status;
PE_COFF_LOADER_IMAGE_CONTEXT context;
status = read_header(buffer, &context);
if (status != EFI_SUCCESS)
return status;
status = verify_grub(buffer, size, &context);
return status;
}
EFI_STATUS efi_main (EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *passed_systab)
{
EFI_STATUS efi_status;
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
void *grubdata;
int grubsize;
static SHIM_LOCK shim_lock_interface;
EFI_HANDLE handle = NULL;
shim_lock_interface.Verify = verify_buffer;
systab = passed_systab;
InitializeLib(image_handle, systab);
efi_status = uefi_call_wrapper(BS->InstallProtocolInterface, 4,
&handle, &shim_lock_guid,
EFI_NATIVE_INTERFACE,
&shim_lock_interface);
efi_status = load_grub(image_handle, &grubdata, &grubsize);
if (efi_status != EFI_SUCCESS) {

15
shim.h Normal file
View File

@ -0,0 +1,15 @@
#define SHIM_LOCK_GUID \
{ 0x605dab50, 0xe046, 0x4300, {0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23} }
INTERFACE_DECL(_SHIM_LOCK);
typedef
EFI_STATUS
(EFIAPI *EFI_SHIM_LOCK_VERIFY) (
IN VOID *buffer;
IN UINT32 size;
);
typedef struct _SHIM_LOCK {
EFI_SHIM_LOCK_VERIFY Verify;
} SHIM_LOCK;