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
8DWORD 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
24extern "C" __declspec(dllexport)
25int 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

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