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
12struct A { int x, y, z; };
13struct B { A a; /*gap*/ long b; };
14B *bb;
15
16void test1() {
17 A a1 = {.x: 1, .y: 1, .z: 2};
18 B b1 = {.a: a1, .b: 6};
19 bb = new B(b1);
20}
21
22const char KKK[] = {1, 1, 2};
23char bbb[100000];
24
25void test2() {
26 char cc[sizeof(bbb)];
27 memcpy(dest: cc, src: KKK , n: sizeof(KKK));
28 memcpy(dest: bbb, src: cc, n: sizeof(bbb));
29}
30
31int main(int argc, char *argv[]) {
32 test1();
33 test2();
34 printf(format: "PASSED");
35 return 0;
36}
37
38// CHECK-NOT: ERROR: AddressSanitizer
39// CHECK: PASSED
40

source code of compiler-rt/test/asan/TestCases/pr33372.cpp