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// RUN: %clang_cl_asan -Od %p/dll_host.cc -Fe%t
// RUN: %clang_cl_asan -LD -O2 %s -Fe%t.dll
// RUNX: %run %t %t.dll 2>&1 | FileCheck %s
// Check that ASan does not CHECK fail when SEH is used around a crash from a
// thread injected by control C.
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
static void __declspec(noinline) CrashOnProcessDetach() {
printf("CrashOnProcessDetach\n");
fflush(stdout);
*static_cast<volatile int *>(0) = 0x356;
}
bool g_is_child = false;
BOOL WINAPI DllMain(PVOID h, DWORD reason, PVOID reserved) {
if (reason == DLL_PROCESS_DETACH && g_is_child) {
printf("in DllMain DLL_PROCESS_DETACH\n");
fflush(stdout);
__try {
CrashOnProcessDetach();
} __except (1) {
printf("caught crash\n");
fflush(stdout);
}
}
return true;
}
static void run_child() {
// Send this process group Ctrl+C. That should only be this process.
printf("GenerateConsoleCtrlEvent\n");
fflush(stdout);
GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0);
Sleep(10 * 1000); // Wait 10 seconds, and the process should die.
printf("unexpected execution after interrupt\n");
fflush(stdout);
exit(0x42);
}
static int WINAPI ignore_control_c(DWORD ctrl_type) {
// Don't interrupt the parent.
return ctrl_type == CTRL_C_EVENT;
}
static int run_parent() {
// Set an environment variable to tell the child process to interrupt itself.
if (!SetEnvironmentVariableW(L"DO_CONTROL_C", L"1")) {
printf("SetEnvironmentVariableW failed (0x%8lx).\n", GetLastError());
fflush(stdout);
return 2;
}
// Launch a new process using the current executable with a new console.
// Ctrl-C events are console-wide, so we need a new console.
STARTUPINFOW si;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
// Hides the new console window that we are creating.
si.dwFlags |= STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
// Ensures that stdout still goes to the parent despite the new console.
si.dwFlags |= STARTF_USESTDHANDLES;
si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
PROCESS_INFORMATION pi;
memset(&pi, 0, sizeof(pi));
int flags = CREATE_NO_WINDOW | CREATE_NEW_PROCESS_GROUP | CREATE_NEW_CONSOLE;
if (!CreateProcessW(nullptr, // No module name (use command line)
GetCommandLineW(), // Command line
nullptr, // Process handle not inheritable
nullptr, // Thread handle not inheritable
TRUE, // Set handle inheritance to TRUE
flags, // Flags to give the child a console
nullptr, // Use parent's environment block
nullptr, // Use parent's starting directory
&si, &pi)) {
printf("CreateProcess failed (0x%08lx).\n", GetLastError());
fflush(stdout);
return 2;
}
// Wait until child process exits.
if (WaitForSingleObject(pi.hProcess, INFINITE) == WAIT_FAILED) {
printf("WaitForSingleObject failed (0x%08lx).\n", GetLastError());
fflush(stdout);
return 2;
}
// Get the exit code. It should be the one for ctrl-c events.
DWORD rc;
if (!GetExitCodeProcess(pi.hProcess, &rc)) {
printf("GetExitCodeProcess failed (0x%08lx).\n", GetLastError());
fflush(stdout);
return 2;
}
if (rc == STATUS_CONTROL_C_EXIT)
printf("child quit with STATUS_CONTROL_C_EXIT\n");
else
printf("unexpected exit code: 0x%08lx\n", rc);
fflush(stdout);
// Close process and thread handles.
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
return 0;
}
// CHECK: in DllMain DLL_PROCESS_DETACH
// CHECK: CrashOnProcessDetach
// CHECK: caught crash
// CHECK: child quit with STATUS_CONTROL_C_EXIT
extern "C" int __declspec(dllexport) test_function() {
wchar_t buf[260];
int len = GetEnvironmentVariableW(L"DO_CONTROL_C", buf, 260);
if (len > 0) {
g_is_child = true;
run_child();
} else {
exit(run_parent());
}
return 0;
}
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