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-rw-r--r--build/win32/crashinject.cpp94
1 files changed, 94 insertions, 0 deletions
diff --git a/build/win32/crashinject.cpp b/build/win32/crashinject.cpp
new file mode 100644
index 0000000000..076e5a12a2
--- /dev/null
+++ b/build/win32/crashinject.cpp
@@ -0,0 +1,94 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Given a PID, this program attempts to inject a DLL into the process
+ * with that PID. The DLL it attempts to inject, "crashinjectdll.dll",
+ * must exist alongside this exe. The DLL will then crash the process.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <windows.h>
+
+int main(int argc, char** argv) {
+ if (argc != 2) {
+ fprintf(stderr, "Usage: crashinject <PID>\n");
+ return 1;
+ }
+
+ int pid = atoi(argv[1]);
+ if (pid <= 0) {
+ fprintf(stderr, "Usage: crashinject <PID>\n");
+ return 1;
+ }
+
+ // find our DLL to inject
+ wchar_t filename[_MAX_PATH];
+ if (GetModuleFileNameW(nullptr, filename,
+ sizeof(filename) / sizeof(wchar_t)) == 0)
+ return 1;
+
+ wchar_t* slash = wcsrchr(filename, L'\\');
+ if (slash == nullptr) return 1;
+
+ slash++;
+ wcscpy(slash, L"crashinjectdll.dll");
+
+ // now find our target process
+ HANDLE targetProc =
+ OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_WRITE |
+ PROCESS_CREATE_THREAD | PROCESS_QUERY_INFORMATION,
+ FALSE, pid);
+ if (targetProc == nullptr) {
+ fprintf(stderr, "Error %lu opening target process\n", GetLastError());
+ return 1;
+ }
+
+ /*
+ * This is sort of insane, but we're implementing a technique described here:
+ * http://www.codeproject.com/KB/threads/winspy.aspx#section_2
+ *
+ * The gist is to use CreateRemoteThread to create a thread in the other
+ * process, but cheat and make the thread function kernel32!LoadLibrary,
+ * so that the only remote data we have to pass to the other process
+ * is the path to the library we want to load. The library we're loading
+ * will then do its dirty work inside the other process.
+ */
+ HMODULE hKernel32 = GetModuleHandleW(L"Kernel32");
+ // allocate some memory to hold the path in the remote process
+ void* pLibRemote = VirtualAllocEx(targetProc, nullptr, sizeof(filename),
+ MEM_COMMIT, PAGE_READWRITE);
+ if (pLibRemote == nullptr) {
+ fprintf(stderr, "Error %lu in VirtualAllocEx\n", GetLastError());
+ CloseHandle(targetProc);
+ return 1;
+ }
+
+ if (!WriteProcessMemory(targetProc, pLibRemote, (void*)filename,
+ sizeof(filename), nullptr)) {
+ fprintf(stderr, "Error %lu in WriteProcessMemory\n", GetLastError());
+ VirtualFreeEx(targetProc, pLibRemote, sizeof(filename), MEM_RELEASE);
+ CloseHandle(targetProc);
+ return 1;
+ }
+ // Now create a thread in the target process that will load our DLL
+ HANDLE hThread = CreateRemoteThread(
+ targetProc, nullptr, 0,
+ (LPTHREAD_START_ROUTINE)GetProcAddress(hKernel32, "LoadLibraryW"),
+ pLibRemote, 0, nullptr);
+ if (hThread == nullptr) {
+ fprintf(stderr, "Error %lu in CreateRemoteThread\n", GetLastError());
+ VirtualFreeEx(targetProc, pLibRemote, sizeof(filename), MEM_RELEASE);
+ CloseHandle(targetProc);
+ return 1;
+ }
+ WaitForSingleObject(hThread, INFINITE);
+ // Cleanup, not that it's going to matter at this point
+ CloseHandle(hThread);
+ VirtualFreeEx(targetProc, pLibRemote, sizeof(filename), MEM_RELEASE);
+ CloseHandle(targetProc);
+
+ return 0;
+}