1 // RUN: %clang_cl_asan -Od %p/dll_host.cpp -Fe%t
2 // RUN: %clang_cl_asan -LD -Od %s -Fe%t.dll
3 // RUN: not %run %t %t.dll 2>&1 | FileCheck %s
4 
5 #include <windows.h>
6 #include <malloc.h>
7 
thread_proc(void * context)8 DWORD WINAPI thread_proc(void *context) {
9   int subscript = -1;
10   char stack_buffer[42];
11   stack_buffer[subscript] = 42;
12 // CHECK: AddressSanitizer: stack-buffer-underflow on address [[ADDR:0x[0-9a-f]+]]
13 // CHECK: WRITE of size 1 at [[ADDR]] thread T1
14 // CHECK-NEXT:  thread_proc{{.*}}dll_thread_stack_array_left_oob.cpp:[[@LINE-3]]
15 //
16 // CHECK: Address [[ADDR]] is located in stack of thread T1 at offset [[OFFSET:.*]] in frame
17 // CHECK-NEXT:  thread_proc{{.*}}dll_thread_stack_array_left_oob.cpp
18 //
19 // CHECK: 'stack_buffer'{{.*}} <== Memory access at offset [[OFFSET]] underflows this variable
20 
21   return 0;
22 }
23 
24 extern "C" __declspec(dllexport)
test_function()25 int test_function() {
26   HANDLE thr = CreateThread(NULL, 0, thread_proc, NULL, 0, NULL);
27 // CHECK-LABEL: Thread T1 created by T0 here:
28 // CHECK:         test_function{{.*}}dll_thread_stack_array_left_oob.cpp:[[@LINE-2]]
29 // CHECK-NEXT:    main{{.*}}dll_host.cpp
30 // CHECK-LABEL: SUMMARY
31   if (thr == 0)
32     return 1;
33   if (WAIT_OBJECT_0 != WaitForSingleObject(thr, INFINITE))
34     return 2;
35   return 0;
36 }
37