compiler-rt/test/asan/TestCases/pr33372.cpp

   1 // RUN: %clangxx_asan -O0 -std=c++11 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 // RUN: %clangxx_asan -O1 -std=c++11 %s -o %t && %run %t 2>&1 | FileCheck %s
   3 // RUN: %clangxx_asan -O2 -std=c++11 %s -o %t && %run %t 2>&1 | FileCheck %s
   4
   5 // Test that we do not detect false buffer overflows cased by optimization when
   6 // when local variable replaced by a smaller global constant.
   7 // https://bugs.llvm.org/show_bug.cgi?id=33372
   8
   9 #include <stdio.h>
  10 #include <string.h>
  11
  12 struct A { int x, y, z; };
  13 struct B { A a; /*gap*/ long b; };
  14 B *bb;
  15
  16 void test1() {
  17   A a1 = {1, 1, 2};
  18   B b1 = {a1, 6};
  19   bb = new B(b1);
  20 }
  21
  22 const char KKK[] = {1, 1, 2};
  23 char bbb[100000];
  24
  25 void test2() {
  26   char cc[sizeof(bbb)];
  27   memcpy(cc, KKK , sizeof(KKK));
  28   memcpy(bbb, cc, sizeof(bbb));
  29 }
  30
  31 int main(int argc, char *argv[]) {
  32   test1();
  33   test2();
  34   printf("PASSED");
  35   return 0;
  36 }
  37
  38 // CHECK-NOT: ERROR: AddressSanitizer
  39 // CHECK: PASSED