struct NaClDesc *NaClExchangeFileTokenForMappableDesc(
struct NaClFileToken *file_token,
struct NaClValidationCache *validation_cache) {
int32_t new_fd;
char *file_path;
uint32_t file_path_length;
struct NaClDesc *desc = NULL;
/*
* Not all file loading paths will produce a valid token. Zero is
* an invalid token value that indicates there is nothing to
* resolve. In this case, assume nothing about the providence of
* the file.
*/
if (!(file_token->lo == 0 && file_token->hi == 0) &&
validation_cache->ResolveFileToken != NULL &&
validation_cache->ResolveFileToken(validation_cache->handle,
file_token,
&new_fd,
&file_path,
&file_path_length)) {
struct NaClRichFileInfo info;
desc = NaClDescIoDescFromHandleAllocCtor((NaClHandle) new_fd,
NACL_ABI_O_RDONLY);
/* Mark the desc as OK for mmapping. */
NaClDescMarkSafeForMmap(desc);
/* Provide metadata for validation. */
NaClRichFileInfoCtor(&info);
info.known_file = 1;
info.file_path = file_path; /* Takes ownership. */
info.file_path_length = file_path_length;
NaClSetFileOriginInfo(desc, &info);
NaClRichFileInfoDtor(&info);
}
return desc;
}
void NaClReplaceDescIfValidationCacheAssertsMappable(
struct NaClDesc **desc_in_out,
struct NaClValidationCache *validation_cache) {
struct NaClDesc *desc = *desc_in_out;
struct NaClDesc *replacement;
struct NaClFileToken file_token;
if (NACL_FI("validation_cache_replacement_bypass", 0, 1)) {
NaClDescMarkSafeForMmap(desc);
} else if (!NaClDescGetFileToken(desc, &file_token)) {
NaClLog(4,
"NaClReplaceDescIfValidationCacheAssertsMappable: no valid"
" file token\n");
} else {
replacement = NaClExchangeFileTokenForMappableDesc(&file_token,
validation_cache);
if (NULL != replacement) {
NaClDescUnref(desc);
*desc_in_out = replacement;
}
}
}
struct NaClDesc *NaClDescCreateWithFilePathMetadata(NaClHandle handle,
const char *file_path) {
struct NaClDesc *desc = NaClDescIoDescFromHandleAllocCtor(handle,
NACL_ABI_O_RDONLY);
char *alloc_file_path;
size_t file_path_length = strlen(file_path);
struct NaClRichFileInfo info;
if (desc == NULL)
return NULL;
/*
* If there is no file path metadata, just return the created NaClDesc
* without adding rich file info.
*/
if (file_path_length == 0)
return desc;
/* Mark the desc as OK for mmapping. */
NaClDescMarkSafeForMmap(desc);
alloc_file_path = (char *) malloc(file_path_length + 1);
if (alloc_file_path == NULL) {
NaClDescUnref(desc);
return NULL;
}
memcpy(alloc_file_path, file_path, file_path_length + 1);
/* Provide metadata for validation. */
NaClRichFileInfoCtor(&info);
info.known_file = 1;
info.file_path = alloc_file_path; /* Takes ownership. */
info.file_path_length = (uint32_t) file_path_length;
NaClSetFileOriginInfo(desc, &info);
NaClRichFileInfoDtor(&info);
return desc;
}
