void TestDEPCheckFailurePath(void) {
size_t size = NACL_PAGESIZE;
void *page;
CHECK(NaCl_page_alloc(&page, size) == 0);
CHECK(NaCl_mprotect(page, size, PROT_READ | PROT_WRITE | PROT_EXEC) == 0);
CHECK(!NaClAttemptToExecuteDataAtAddr(page, size));
/* DEP is not guaranteed to work on x86-32. */
if (!(NACL_ARCH(NACL_BUILD_ARCH) == NACL_x86 && NACL_BUILD_SUBARCH == 32)) {
CHECK(NaCl_mprotect(page, size, PROT_READ | PROT_WRITE) == 0);
CHECK(NaClAttemptToExecuteDataAtAddr(page, size));
}
NaCl_page_free(page, size);
}
/*
* Returns 1 if Data Execution Prevention is present and working.
*/
int NaClAttemptToExecuteData(void) {
int result;
char *thunk_buffer = malloc(64);
if (NULL == thunk_buffer) {
return 0;
}
result = NaClAttemptToExecuteDataAtAddr(thunk_buffer, 64);
free(thunk_buffer);
return result;
}
