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/* Copyright (c) 2018-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file winprocess_sys.c
* \brief Subsystem object for windows process setup.
**/
#include "orconfig.h"
#include "lib/subsys/subsys.h"
#include "lib/llharden/winprocess_sys.h"
#include <stdbool.h>
#include <stddef.h>
#ifdef _WIN32
#include <windows.h>
#define WINPROCESS_SYS_ENABLED true
static int
subsys_winprocess_initialize(void)
{
#ifndef HeapEnableTerminationOnCorruption
#define HeapEnableTerminationOnCorruption 1
#endif
/* On heap corruption, just give up; don't try to play along. */
HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
/* SetProcessDEPPolicy is only supported on 32-bit Windows.
* (On 64-bit Windows it always fails, and some compilers don't like the
* PSETDEP cast.)
* 32-bit Windows defines _WIN32.
* 64-bit Windows defines _WIN32 and _WIN64. */
#ifndef _WIN64
/* Call SetProcessDEPPolicy to permanently enable DEP.
The function will not resolve on earlier versions of Windows,
and failure is not dangerous. */
HMODULE hMod = GetModuleHandleA("Kernel32.dll");
if (hMod) {
typedef BOOL (WINAPI *PSETDEP)(DWORD);
PSETDEP setdeppolicy = (PSETDEP)GetProcAddress(hMod,
"SetProcessDEPPolicy");
if (setdeppolicy) {
/* PROCESS_DEP_ENABLE | PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION */
setdeppolicy(3);
}
}
#endif /* !defined(_WIN64) */
return 0;
}
#else /* !defined(_WIN32) */
#define WINPROCESS_SYS_ENABLED false
#define subsys_winprocess_initialize NULL
#endif /* defined(_WIN32) */
const subsys_fns_t sys_winprocess = {
.name = "winprocess",
SUBSYS_DECLARE_LOCATION(),
/* HeapEnableTerminationOnCorruption and setdeppolicy() are security
* features, we want them to run first. */
.level = -100,
.supported = WINPROCESS_SYS_ENABLED,
.initialize = subsys_winprocess_initialize,
};
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