compiler-rt/test/dfsan/origin_ld_lost.c

   1 // RUN: %clang_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \
   2 // RUN:     %run %t >%t.out 2>&1
   3 // RUN: FileCheck %s < %t.out
   4 //
   5 // REQUIRES: x86_64-target-arch
   6 //
   7 // Test origin tracking can lost origins at 2-byte load with addr % 4 == 3.
   8
   9 #include <sanitizer/dfsan_interface.h>
  10
  11 __attribute__((noinline)) uint16_t foo(uint16_t a, uint16_t b) { return a + b; }
  12
  13 int main(int argc, char *argv[]) {
  14   uint64_t a __attribute__((aligned(4))) = 1;
  15   uint32_t b = 10;
  16   dfsan_set_label(4, (uint8_t *)&a + 4, sizeof(uint8_t));
  17   uint16_t c = foo(*(uint16_t *)((uint8_t *)&a + 3), b);
  18   dfsan_print_origin_trace(&c, "foo");
  19 }
  20
  21 // CHECK: Taint value 0x4 {{.*}} origin tracking (foo)
  22 // CHECK: Origin value: {{.*}}, Taint value was created at
  23 // CHECK: #0 {{.*}} in main {{.*}}origin_ld_lost.c:[[@LINE-6]]