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406cc6afbf
TrampolineCollection iterates over an array of Trampolines that it has set 'write' permissions for. If this happens in a process whose sandbox forbids dynamic code then these permissions cannot be set. This patch detects that condition and returns an empty TrampolineCollection in that case. We ASSERT if we fail to set permissions for any other reason. Differential Revision: https://phabricator.services.mozilla.com/D28613 --HG-- extra : moz-landing-system : lando
63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/DynamicallyLinkedFunctionPtr.h"
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#include "mozilla/WindowsProcessMitigations.h"
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#include <processthreadsapi.h>
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#if (_WIN32_WINNT < 0x0602)
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BOOL WINAPI GetProcessMitigationPolicy(
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HANDLE hProcess, PROCESS_MITIGATION_POLICY MitigationPolicy, PVOID lpBuffer,
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SIZE_T dwLength);
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#endif // (_WIN32_WINNT < 0x0602)
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namespace mozilla {
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static const DynamicallyLinkedFunctionPtr<
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decltype(&::GetProcessMitigationPolicy)>&
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FetchGetProcessMitigationPolicyFunc() {
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static const DynamicallyLinkedFunctionPtr<decltype(
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&::GetProcessMitigationPolicy)>
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pGetProcessMitigationPolicy(L"kernel32.dll",
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"GetProcessMitigationPolicy");
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return pGetProcessMitigationPolicy;
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}
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MFBT_API bool IsWin32kLockedDown() {
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auto& pGetProcessMitigationPolicy = FetchGetProcessMitigationPolicyFunc();
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if (!pGetProcessMitigationPolicy) {
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return false;
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}
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PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY polInfo;
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if (!pGetProcessMitigationPolicy(::GetCurrentProcess(),
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ProcessSystemCallDisablePolicy, &polInfo,
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sizeof(polInfo))) {
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return false;
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}
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return polInfo.DisallowWin32kSystemCalls;
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}
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MFBT_API bool IsDynamicCodeDisabled() {
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auto& pGetProcessMitigationPolicy = FetchGetProcessMitigationPolicyFunc();
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if (!pGetProcessMitigationPolicy) {
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return false;
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}
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PROCESS_MITIGATION_DYNAMIC_CODE_POLICY polInfo;
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if (!pGetProcessMitigationPolicy(::GetCurrentProcess(),
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ProcessDynamicCodePolicy, &polInfo,
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sizeof(polInfo))) {
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return false;
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}
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return polInfo.ProhibitDynamicCode;
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}
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} // namespace mozilla
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