proxmox-mirrors/efi-boot-shim
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Make sure we don't try to load a binary from a different arch.

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Since in theory you could, for example, get an x86_64 binary signed that
also behaves as an ARM executable, we should be checking this before
people build on other architectures.

Signed-off-by: Peter Jones <pjones@redhat.com>
This commit is contained in:
Peter Jones 2014-08-27 16:39:51 -04:00
parent 32f10548cd
commit fa2a35ce78
2 changed files with 20 additions and 0 deletions
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1
include/PeImage.h
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@ -49,6 +49,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#define IMAGE_FILE_MACHINE_EBC 0x0EBC
#define IMAGE_FILE_MACHINE_X64 0x8664
#define IMAGE_FILE_MACHINE_ARMTHUMB_MIXED 0x01c2
#define IMAGE_FILE_MACHINE_ARM64 0xaa64
//
// EXE file formats

19
shim.c
View File

@ -947,6 +947,20 @@ static EFI_STATUS read_header(void *data, unsigned int datasize,
return EFI_SUCCESS;
}
static const UINT16 machine_type =
#if defined(__x86_64__)
IMAGE_FILE_MACHINE_X64;
#elif defined(__aarch64__)
IMAGE_FILE_MACHINE_ARM64;
#elif defined(__arm__)
IMAGE_FILE_MACHINE_ARMTHUMB_MIXED;
#elif defined(__i386__) || defined(__i486__) || defined(__i686__)
IMAGE_FILE_MACHINE_I386;
#elif defined(__ia64__)
IMAGE_FILE_MACHINE_IA64;
#else
#error this architecture is not supported by shim
#endif
/*
* Once the image has been loaded it needs to be validated and relocated
@ -971,6 +985,11 @@ static EFI_STATUS handle_image (void *data, unsigned int datasize,
return efi_status;
}
if (context.PEHdr->Pe32.FileHeader.Machine != machine_type) {
perror(L"Image is for a different architecture\n");
return EFI_UNSUPPORTED;
}
/*
* We only need to verify the binary if we're in secure mode
*/