compiler-rt/test/dfsan/origin_invalid.c

   1 // REQUIRES: target={{x86_64-.*}}
   2 // RUN: %clang_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \
   3 // RUN:     %run %t >%t.out 2>&1
   4 // RUN: FileCheck %s < %t.out
   5
   6 #include <sanitizer/dfsan_interface.h>
   7
   8 int main(int argc, char *argv[]) {
   9   uint64_t a = 10;
  10   dfsan_set_label(1, &a, sizeof(a));
  11
  12   // Manually compute origin address for &a.
  13   // See x86 MEM_TO_ORIGIN macro for logic to replicate here.
  14   // Alignment is also needed after to MEM_TO_ORIGIN.
  15   uint64_t origin_addr =
  16       (((uint64_t)&a ^ 0x500000000000ULL) + 0x100000000000ULL) & ~0x3ULL;
  17
  18   // Take the address we computed, and store 0 in it to mess it up.
  19   asm("mov %0, %%rax": :"r"(origin_addr));
  20   asm("movq $0, (%rax)");
  21   dfsan_print_origin_trace(&a, "invalid");
  22 }
  23
  24 // CHECK: Taint value 0x1 (at {{.*}}) origin tracking (invalid)
  25 // CHECK: Taint value 0x1 (at {{.*}}) has invalid origin tracking. This can be a DFSan bug.