| // RUN: %clang_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \ |
| // RUN: %run %t >%t.out 2>&1 |
| // RUN: FileCheck %s < %t.out |
| // |
| // REQUIRES: x86_64-target-arch |
| |
| #include <sanitizer/dfsan_interface.h> |
| |
| int main(int argc, char *argv[]) { |
| uint64_t a = 10; |
| dfsan_set_label(1, &a, sizeof(a)); |
| |
| // Manually compute origin address for &a. |
| // See x86 MEM_TO_ORIGIN macro for logic to replicate here. |
| // Alignment is also needed after to MEM_TO_ORIGIN. |
| uint64_t origin_addr = |
| (((uint64_t)&a ^ 0x500000000000ULL) + 0x100000000000ULL) & ~0x3ULL; |
| |
| // Take the address we computed, and store 0 in it to mess it up. |
| asm("mov %0, %%rax": :"r"(origin_addr)); |
| asm("movq $0, (%rax)"); |
| dfsan_print_origin_trace(&a, "invalid"); |
| } |
| |
| // CHECK: Taint value 0x1 (at {{.*}}) origin tracking (invalid) |
| // CHECK: Taint value 0x1 (at {{.*}}) has invalid origin tracking. This can be a DFSan bug. |
