diff options
Diffstat (limited to 'shim.c')
| -rw-r--r-- | shim.c | 34 |
1 files changed, 23 insertions, 11 deletions
@@ -754,11 +754,7 @@ static EFI_STATUS generate_hash (char *data, unsigned int datasize_in, EFI_IMAGE_DOS_HEADER *DosHdr = (void *)data; unsigned int PEHdr_offset = 0; - if (datasize_in < 0) { - perror(L"Invalid data size\n"); - return EFI_INVALID_PARAMETER; - } - size = datasize = (unsigned int)datasize_in; + size = datasize = datasize_in; if (datasize <= sizeof (*DosHdr) || DosHdr->e_magic != EFI_IMAGE_DOS_SIGNATURE) { @@ -1016,6 +1012,9 @@ static EFI_STATUS verify_buffer (char *data, int datasize, WIN_CERTIFICATE_EFI_PKCS *cert = NULL; unsigned int size = datasize; + if (datasize < 0) + return EFI_INVALID_PARAMETER; + if (context->SecDir->Size != 0) { if (context->SecDir->Size >= size) { perror(L"Certificate Database size is too large\n"); @@ -1801,6 +1800,9 @@ EFI_STATUS shim_verify (void *buffer, UINT32 size) UINT8 sha1hash[SHA1_DIGEST_SIZE]; UINT8 sha256hash[SHA256_DIGEST_SIZE]; + if ((INT32)size < 0) + return EFI_INVALID_PARAMETER; + loader_is_participating = 1; in_protocol = 1; @@ -1837,6 +1839,9 @@ static EFI_STATUS shim_hash (char *data, int datasize, { EFI_STATUS status; + if (datasize < 0) + return EFI_INVALID_PARAMETER; + in_protocol = 1; status = generate_hash(data, datasize, context, sha256hash, sha1hash); in_protocol = 0; @@ -1899,17 +1904,20 @@ EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath) efi_status = FetchNetbootimage(image_handle, &sourcebuffer, &sourcesize); if (efi_status != EFI_SUCCESS) { - perror(L"Unable to fetch TFTP image: %r\n", efi_status); + perror(L"Unable to fetch TFTP image: %r\n", + efi_status); return efi_status; } data = sourcebuffer; datasize = sourcesize; #if defined(ENABLE_HTTPBOOT) } else if (find_httpboot(li->DeviceHandle)) { - efi_status = httpboot_fetch_buffer (image_handle, &sourcebuffer, + efi_status = httpboot_fetch_buffer (image_handle, + &sourcebuffer, &sourcesize); if (efi_status != EFI_SUCCESS) { - perror(L"Unable to fetch HTTP image: %r\n", efi_status); + perror(L"Unable to fetch HTTP image: %r\n", + efi_status); return efi_status; } data = sourcebuffer; @@ -1920,15 +1928,20 @@ EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath) * Read the new executable off disk */ efi_status = load_image(li, &data, &datasize, PathName); - if (efi_status != EFI_SUCCESS) { - perror(L"Failed to load image %s: %r\n", PathName, efi_status); + perror(L"Failed to load image %s: %r\n", + PathName, efi_status); PrintErrors(); ClearErrors(); goto done; } } + if (datasize < 0) { + efi_status = EFI_INVALID_PARAMETER; + goto done; + } + /* * We need to modify the loaded image protocol entry before running * the new binary, so back it up @@ -1939,7 +1952,6 @@ EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath) * Verify and, if appropriate, relocate and execute the executable */ efi_status = handle_image(data, datasize, li); - if (efi_status != EFI_SUCCESS) { perror(L"Failed to load image: %r\n", efi_status); PrintErrors(); |