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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "mozilla/WindowsProcessMitigations.h"
#include <processthreadsapi.h>
#include "mozilla/Assertions.h"
#include "mozilla/DynamicallyLinkedFunctionPtr.h"
static_assert(sizeof(PROCESS_MITIGATION_DYNAMIC_CODE_POLICY) == 4);
#if (_WIN32_WINNT < 0x0602)
BOOL WINAPI GetProcessMitigationPolicy(
HANDLE hProcess, PROCESS_MITIGATION_POLICY MitigationPolicy, PVOID lpBuffer,
SIZE_T dwLength);
#endif // (_WIN32_WINNT < 0x0602)
namespace mozilla {
static decltype(&::GetProcessMitigationPolicy)
FetchGetProcessMitigationPolicyFunc() {
static const StaticDynamicallyLinkedFunctionPtr<
decltype(&::GetProcessMitigationPolicy)>
pGetProcessMitigationPolicy(L"kernel32.dll",
"GetProcessMitigationPolicy");
return pGetProcessMitigationPolicy;
}
static bool sWin32kLockedDownInPolicy = false;
MFBT_API bool IsWin32kLockedDown() {
static bool sWin32kLockedDown = []() {
auto pGetProcessMitigationPolicy = FetchGetProcessMitigationPolicyFunc();
PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY polInfo;
if (!pGetProcessMitigationPolicy ||
!pGetProcessMitigationPolicy(::GetCurrentProcess(),
ProcessSystemCallDisablePolicy, &polInfo,
sizeof(polInfo))) {
// We failed to get pointer to GetProcessMitigationPolicy or the call
// to it failed, so just return what the sandbox policy says.
return sWin32kLockedDownInPolicy;
}
return !!polInfo.DisallowWin32kSystemCalls;
}();
return sWin32kLockedDown;
}
MFBT_API void SetWin32kLockedDownInPolicy() {
sWin32kLockedDownInPolicy = true;
}
MFBT_API bool IsDynamicCodeDisabled() {
auto pGetProcessMitigationPolicy = FetchGetProcessMitigationPolicyFunc();
if (!pGetProcessMitigationPolicy) {
return false;
}
PROCESS_MITIGATION_DYNAMIC_CODE_POLICY polInfo;
if (!pGetProcessMitigationPolicy(::GetCurrentProcess(),
ProcessDynamicCodePolicy, &polInfo,
sizeof(polInfo))) {
return false;
}
return polInfo.ProhibitDynamicCode;
}
MFBT_API bool IsEafPlusEnabled() {
auto pGetProcessMitigationPolicy = FetchGetProcessMitigationPolicyFunc();
if (!pGetProcessMitigationPolicy) {
return false;
}
PROCESS_MITIGATION_PAYLOAD_RESTRICTION_POLICY polInfo;
if (!pGetProcessMitigationPolicy(::GetCurrentProcess(),
ProcessPayloadRestrictionPolicy, &polInfo,
sizeof(polInfo))) {
return false;
}
return polInfo.EnableExportAddressFilterPlus;
}
} // namespace mozilla
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