| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "sandbox/win/src/process_mitigations.h" |
| |
| #include <stddef.h> |
| |
| #include <algorithm> |
| |
| #include "base/files/file_path.h" |
| #include "base/scoped_native_library.h" |
| #include "base/win/windows_version.h" |
| #include "sandbox/win/src/nt_internals.h" |
| #include "sandbox/win/src/restricted_token_utils.h" |
| #include "sandbox/win/src/sandbox_rand.h" |
| #include "sandbox/win/src/win_utils.h" |
| |
| namespace { |
| // API defined in winbase.h >= Vista. |
| using SetProcessDEPPolicyFunction = decltype(&SetProcessDEPPolicy); |
| |
| // API defined in libloaderapi.h >= Win8. |
| using SetDefaultDllDirectoriesFunction = decltype(&SetDefaultDllDirectories); |
| |
| // APIs defined in processthreadsapi.h >= Win8. |
| using SetProcessMitigationPolicyFunction = |
| decltype(&SetProcessMitigationPolicy); |
| using GetProcessMitigationPolicyFunction = |
| decltype(&GetProcessMitigationPolicy); |
| using SetThreadInformationFunction = decltype(&SetThreadInformation); |
| |
| // Returns a two-element array of mitigation flags supported on this machine. |
| // - This function is only useful on >= base::win::VERSION_WIN8. |
| const ULONG64* GetSupportedMitigations() { |
| static ULONG64 mitigations[2] = {}; |
| |
| // This static variable will only be initialized once. |
| if (!mitigations[0] && !mitigations[1]) { |
| GetProcessMitigationPolicyFunction get_process_mitigation_policy = |
| reinterpret_cast<GetProcessMitigationPolicyFunction>(::GetProcAddress( |
| ::GetModuleHandleA("kernel32.dll"), "GetProcessMitigationPolicy")); |
| if (get_process_mitigation_policy) { |
| // NOTE: the two-element-sized input array is only supported on >= Win10 |
| // RS2. |
| // If an earlier version, the second element will be left 0. |
| size_t mits_size = |
| (base::win::GetVersion() >= base::win::VERSION_WIN10_RS2) |
| ? (sizeof(mitigations[0]) * 2) |
| : sizeof(mitigations[0]); |
| if (!get_process_mitigation_policy(::GetCurrentProcess(), |
| ProcessMitigationOptionsMask, |
| &mitigations, mits_size)) { |
| NOTREACHED(); |
| } |
| } |
| } |
| |
| return &mitigations[0]; |
| } |
| |
| } // namespace |
| |
| namespace sandbox { |
| |
| bool ApplyProcessMitigationsToCurrentProcess(MitigationFlags flags) { |
| if (!CanSetProcessMitigationsPostStartup(flags)) |
| return false; |
| |
| base::win::Version version = base::win::GetVersion(); |
| HMODULE module = ::GetModuleHandleA("kernel32.dll"); |
| |
| if (flags & MITIGATION_DLL_SEARCH_ORDER) { |
| SetDefaultDllDirectoriesFunction set_default_dll_directories = |
| reinterpret_cast<SetDefaultDllDirectoriesFunction>( |
| ::GetProcAddress(module, "SetDefaultDllDirectories")); |
| |
| // Check for SetDefaultDllDirectories since it requires KB2533623. |
| if (set_default_dll_directories) { |
| #if defined(COMPONENT_BUILD) |
| const DWORD directory_flags = LOAD_LIBRARY_SEARCH_DEFAULT_DIRS; |
| #else |
| // In a non-component build, all DLLs will be loaded manually, or via |
| // manifest definition, so these flags can be stronger. This prevents DLL |
| // planting in the application directory. |
| const DWORD directory_flags = |
| LOAD_LIBRARY_SEARCH_SYSTEM32 | LOAD_LIBRARY_SEARCH_USER_DIRS; |
| #endif |
| if (!set_default_dll_directories(directory_flags) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| } |
| |
| // Set the heap to terminate on corruption |
| if (flags & MITIGATION_HEAP_TERMINATE) { |
| if (!::HeapSetInformation(nullptr, HeapEnableTerminationOnCorruption, |
| nullptr, 0) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| if (flags & MITIGATION_HARDEN_TOKEN_IL_POLICY) { |
| DWORD error = HardenProcessIntegrityLevelPolicy(); |
| if ((error != ERROR_SUCCESS) && (error != ERROR_ACCESS_DENIED)) |
| return false; |
| } |
| |
| #if !defined(_WIN64) // DEP is always enabled on 64-bit. |
| if (flags & MITIGATION_DEP) { |
| DWORD dep_flags = PROCESS_DEP_ENABLE; |
| |
| if (flags & MITIGATION_DEP_NO_ATL_THUNK) |
| dep_flags |= PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION; |
| |
| SetProcessDEPPolicyFunction set_process_dep_policy = |
| reinterpret_cast<SetProcessDEPPolicyFunction>( |
| ::GetProcAddress(module, "SetProcessDEPPolicy")); |
| if (set_process_dep_policy) { |
| if (!set_process_dep_policy(dep_flags) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } else |
| return false; |
| } |
| #endif |
| |
| // This is all we can do in Win7 and below. |
| if (version < base::win::VERSION_WIN8) |
| return true; |
| |
| SetProcessMitigationPolicyFunction set_process_mitigation_policy = |
| reinterpret_cast<SetProcessMitigationPolicyFunction>( |
| ::GetProcAddress(module, "SetProcessMitigationPolicy")); |
| if (!set_process_mitigation_policy) |
| return false; |
| |
| // Enable ASLR policies. |
| if (flags & MITIGATION_RELOCATE_IMAGE) { |
| PROCESS_MITIGATION_ASLR_POLICY policy = {}; |
| policy.EnableForceRelocateImages = true; |
| policy.DisallowStrippedImages = |
| (flags & MITIGATION_RELOCATE_IMAGE_REQUIRED) == |
| MITIGATION_RELOCATE_IMAGE_REQUIRED; |
| |
| if (!set_process_mitigation_policy(ProcessASLRPolicy, &policy, |
| sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| // Enable strict handle policies. |
| if (flags & MITIGATION_STRICT_HANDLE_CHECKS) { |
| PROCESS_MITIGATION_STRICT_HANDLE_CHECK_POLICY policy = {}; |
| policy.HandleExceptionsPermanentlyEnabled = |
| policy.RaiseExceptionOnInvalidHandleReference = true; |
| |
| if (!set_process_mitigation_policy(ProcessStrictHandleCheckPolicy, &policy, |
| sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| // Enable system call policies. |
| if (flags & MITIGATION_WIN32K_DISABLE) { |
| PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY policy = {}; |
| policy.DisallowWin32kSystemCalls = true; |
| |
| if (!set_process_mitigation_policy(ProcessSystemCallDisablePolicy, &policy, |
| sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| // Enable extension point policies. |
| if (flags & MITIGATION_EXTENSION_POINT_DISABLE) { |
| PROCESS_MITIGATION_EXTENSION_POINT_DISABLE_POLICY policy = {}; |
| policy.DisableExtensionPoints = true; |
| |
| if (!set_process_mitigation_policy(ProcessExtensionPointDisablePolicy, |
| &policy, sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| if (version < base::win::VERSION_WIN8_1) |
| return true; |
| |
| // Enable dynamic code policies. |
| if (flags & MITIGATION_DYNAMIC_CODE_DISABLE || |
| flags & MITIGATION_DYNAMIC_CODE_DISABLE_WITH_OPT_OUT) { |
| PROCESS_MITIGATION_DYNAMIC_CODE_POLICY policy = {}; |
| policy.ProhibitDynamicCode = true; |
| |
| // Per-thread opt-out is only supported on >= Anniversary. |
| if (version >= base::win::VERSION_WIN10_RS1 && |
| flags & MITIGATION_DYNAMIC_CODE_DISABLE_WITH_OPT_OUT) { |
| policy.AllowThreadOptOut = true; |
| } |
| |
| if (!set_process_mitigation_policy(ProcessDynamicCodePolicy, &policy, |
| sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| if (version < base::win::VERSION_WIN10) |
| return true; |
| |
| // Enable font policies. |
| if (flags & MITIGATION_NONSYSTEM_FONT_DISABLE) { |
| PROCESS_MITIGATION_FONT_DISABLE_POLICY policy = {}; |
| policy.DisableNonSystemFonts = true; |
| |
| if (!set_process_mitigation_policy(ProcessFontDisablePolicy, &policy, |
| sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| if (version < base::win::VERSION_WIN10_TH2) |
| return true; |
| |
| // Enable binary signing policies. |
| if (flags & MITIGATION_FORCE_MS_SIGNED_BINS) { |
| PROCESS_MITIGATION_BINARY_SIGNATURE_POLICY policy = {}; |
| // Allow only MS signed binaries. |
| policy.MicrosoftSignedOnly = true; |
| // NOTE: there are two other flags available to allow |
| // 1) Only Windows Store signed. |
| // 2) MS-signed, Win Store signed, and WHQL signed binaries. |
| // Support not added at the moment. |
| if (!set_process_mitigation_policy(ProcessSignaturePolicy, &policy, |
| sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| // Enable image load policies. |
| if (flags & MITIGATION_IMAGE_LOAD_NO_REMOTE || |
| flags & MITIGATION_IMAGE_LOAD_NO_LOW_LABEL || |
| flags & MITIGATION_IMAGE_LOAD_PREFER_SYS32) { |
| PROCESS_MITIGATION_IMAGE_LOAD_POLICY policy = {}; |
| if (flags & MITIGATION_IMAGE_LOAD_NO_REMOTE) |
| policy.NoRemoteImages = true; |
| if (flags & MITIGATION_IMAGE_LOAD_NO_LOW_LABEL) |
| policy.NoLowMandatoryLabelImages = true; |
| // PreferSystem32 is only supported on >= Anniversary. |
| if (version >= base::win::VERSION_WIN10_RS1 && |
| flags & MITIGATION_IMAGE_LOAD_PREFER_SYS32) { |
| policy.PreferSystem32Images = true; |
| } |
| |
| if (!set_process_mitigation_policy(ProcessImageLoadPolicy, &policy, |
| sizeof(policy)) && |
| ERROR_ACCESS_DENIED != ::GetLastError()) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool ApplyMitigationsToCurrentThread(MitigationFlags flags) { |
| if (!CanSetMitigationsPerThread(flags)) |
| return false; |
| |
| base::win::Version version = base::win::GetVersion(); |
| |
| if (version < base::win::VERSION_WIN10_RS1) |
| return true; |
| |
| // Enable dynamic code per-thread policies. |
| if (flags & MITIGATION_DYNAMIC_CODE_OPT_OUT_THIS_THREAD) { |
| DWORD thread_policy = THREAD_DYNAMIC_CODE_ALLOW; |
| |
| // NOTE: SetThreadInformation API only exists on >= Win8. Dynamically |
| // get function handle. |
| base::ScopedNativeLibrary dll(base::FilePath(L"kernel32.dll")); |
| if (!dll.is_valid()) |
| return false; |
| SetThreadInformationFunction set_thread_info_function = |
| reinterpret_cast<SetThreadInformationFunction>( |
| dll.GetFunctionPointer("SetThreadInformation")); |
| if (!set_thread_info_function) |
| return false; |
| |
| // NOTE: Must use the pseudo-handle here, a thread HANDLE won't work. |
| if (!set_thread_info_function(::GetCurrentThread(), ThreadDynamicCodePolicy, |
| &thread_policy, sizeof(thread_policy))) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| void ConvertProcessMitigationsToPolicy(MitigationFlags flags, |
| DWORD64* policy_flags, |
| size_t* size) { |
| base::win::Version version = base::win::GetVersion(); |
| |
| // |policy_flags| is a two-element array of DWORD64s. Ensure mitigation flags |
| // from PROCESS_CREATION_MITIGATION_POLICY2_* go into the second value. If |
| // any flags are set in value 2, update |size| to include both elements. |
| DWORD64* policy_value_1 = &policy_flags[0]; |
| DWORD64* policy_value_2 = &policy_flags[1]; |
| *policy_value_1 = 0; |
| *policy_value_2 = 0; |
| |
| #if defined(_WIN64) |
| *size = sizeof(*policy_flags); |
| #elif defined(_M_IX86) |
| // A 64-bit flags attribute is illegal on 32-bit Win 7. |
| if (version < base::win::VERSION_WIN8) |
| *size = sizeof(DWORD); |
| else |
| *size = sizeof(*policy_flags); |
| #else |
| #error This platform is not supported. |
| #endif |
| |
| // DEP and SEHOP are not valid for 64-bit Windows |
| #if !defined(_WIN64) |
| if (flags & MITIGATION_DEP) { |
| *policy_value_1 |= PROCESS_CREATION_MITIGATION_POLICY_DEP_ENABLE; |
| if (!(flags & MITIGATION_DEP_NO_ATL_THUNK)) |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_DEP_ATL_THUNK_ENABLE; |
| } |
| |
| if (flags & MITIGATION_SEHOP) |
| *policy_value_1 |= PROCESS_CREATION_MITIGATION_POLICY_SEHOP_ENABLE; |
| #endif |
| |
| // Win 7 |
| if (version < base::win::VERSION_WIN8) |
| return; |
| |
| // Everything >= Win8, do not return before the end of the function where |
| // the final policy bitmap is sanity checked against what is supported on this |
| // machine. The API required to do so is only available since Win8. |
| |
| // Mitigations >= Win8: |
| //---------------------------------------------------------------------------- |
| if (version >= base::win::VERSION_WIN8) { |
| if (flags & MITIGATION_RELOCATE_IMAGE) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_FORCE_RELOCATE_IMAGES_ALWAYS_ON; |
| if (flags & MITIGATION_RELOCATE_IMAGE_REQUIRED) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_FORCE_RELOCATE_IMAGES_ALWAYS_ON_REQ_RELOCS; |
| } |
| } |
| |
| if (flags & MITIGATION_HEAP_TERMINATE) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_HEAP_TERMINATE_ALWAYS_ON; |
| } |
| |
| if (flags & MITIGATION_BOTTOM_UP_ASLR) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_BOTTOM_UP_ASLR_ALWAYS_ON; |
| } |
| |
| if (flags & MITIGATION_HIGH_ENTROPY_ASLR) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_HIGH_ENTROPY_ASLR_ALWAYS_ON; |
| } |
| |
| if (flags & MITIGATION_STRICT_HANDLE_CHECKS) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_STRICT_HANDLE_CHECKS_ALWAYS_ON; |
| } |
| |
| if (flags & MITIGATION_WIN32K_DISABLE) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_WIN32K_SYSTEM_CALL_DISABLE_ALWAYS_ON; |
| } |
| |
| if (flags & MITIGATION_EXTENSION_POINT_DISABLE) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_EXTENSION_POINT_DISABLE_ALWAYS_ON; |
| } |
| } |
| |
| // Mitigations >= Win8.1: |
| //---------------------------------------------------------------------------- |
| if (version >= base::win::VERSION_WIN8_1) { |
| if (flags & MITIGATION_DYNAMIC_CODE_DISABLE) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_PROHIBIT_DYNAMIC_CODE_ALWAYS_ON; |
| } |
| } |
| |
| // Mitigations >= Win10: |
| //---------------------------------------------------------------------------- |
| if (version >= base::win::VERSION_WIN10) { |
| if (flags & MITIGATION_NONSYSTEM_FONT_DISABLE) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_FONT_DISABLE_ALWAYS_ON; |
| } |
| } |
| |
| // Mitigations >= Win10 TH2: |
| //---------------------------------------------------------------------------- |
| if (version >= base::win::VERSION_WIN10_TH2) { |
| if (flags & MITIGATION_FORCE_MS_SIGNED_BINS) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_BLOCK_NON_MICROSOFT_BINARIES_ALWAYS_ON; |
| } |
| |
| if (flags & MITIGATION_IMAGE_LOAD_NO_REMOTE) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_NO_REMOTE_ALWAYS_ON; |
| } |
| |
| if (flags & MITIGATION_IMAGE_LOAD_NO_LOW_LABEL) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_NO_LOW_LABEL_ALWAYS_ON; |
| } |
| } |
| |
| // Mitigations >= Win10 RS1 ("Anniversary"): |
| //---------------------------------------------------------------------------- |
| if (version >= base::win::VERSION_WIN10_RS1) { |
| if (flags & MITIGATION_DYNAMIC_CODE_DISABLE_WITH_OPT_OUT) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_PROHIBIT_DYNAMIC_CODE_ALWAYS_ON_ALLOW_OPT_OUT; |
| } |
| |
| if (flags & MITIGATION_IMAGE_LOAD_PREFER_SYS32) { |
| *policy_value_1 |= |
| PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_PREFER_SYSTEM32_ALWAYS_ON; |
| } |
| } |
| |
| // Mitigations >= Win10 RS3 ("Fall Creator's"): |
| //---------------------------------------------------------------------------- |
| if (version >= base::win::VERSION_WIN10_RS3) { |
| // Note: This mitigation requires not only Win10 1709, but also the January |
| // 2018 security updates and any applicable firmware updates from the |
| // OEM device manufacturer. |
| // Note: Applying this mitigation attribute on creation will succeed, even |
| // if |
| // the underlying hardware does not support the implementation. |
| // Windows just does its best under the hood for the given hardware. |
| if (flags & MITIGATION_RESTRICT_INDIRECT_BRANCH_PREDICTION) { |
| *policy_value_2 |= |
| PROCESS_CREATION_MITIGATION_POLICY2_RESTRICT_INDIRECT_BRANCH_PREDICTION_ALWAYS_ON; |
| } |
| } |
| |
| // When done setting policy flags, sanity check supported policies on this |
| // machine, and then update |size|. |
| |
| const ULONG64* supported = GetSupportedMitigations(); |
| |
| *policy_value_1 = *policy_value_1 & supported[0]; |
| *policy_value_2 = *policy_value_2 & supported[1]; |
| |
| // Only include the second element in |size| if it is non-zero. Else, |
| // UpdateProcThreadAttribute() will return a failure when setting policies. |
| if (*policy_value_2 && version >= base::win::VERSION_WIN10_RS2) { |
| *size = sizeof(*policy_flags) * 2; |
| } |
| |
| return; |
| } |
| |
| MitigationFlags FilterPostStartupProcessMitigations(MitigationFlags flags) { |
| base::win::Version version = base::win::GetVersion(); |
| |
| // Windows 7. |
| if (version < base::win::VERSION_WIN8) { |
| return flags & (MITIGATION_BOTTOM_UP_ASLR | MITIGATION_DLL_SEARCH_ORDER | |
| MITIGATION_HEAP_TERMINATE); |
| } |
| |
| // Windows 8 and above. |
| return flags & (MITIGATION_BOTTOM_UP_ASLR | MITIGATION_DLL_SEARCH_ORDER); |
| } |
| |
| bool ApplyProcessMitigationsToSuspendedProcess(HANDLE process, |
| MitigationFlags flags) { |
| // This is a hack to fake a weak bottom-up ASLR on 32-bit Windows. |
| #if !defined(_WIN64) |
| if (flags & MITIGATION_BOTTOM_UP_ASLR) { |
| unsigned int limit; |
| GetRandom(&limit); |
| char* ptr = 0; |
| const size_t kMask64k = 0xFFFF; |
| // Random range (512k-16.5mb) in 64k steps. |
| const char* end = ptr + ((((limit % 16384) + 512) * 1024) & ~kMask64k); |
| while (ptr < end) { |
| MEMORY_BASIC_INFORMATION memory_info; |
| if (!::VirtualQueryEx(process, ptr, &memory_info, sizeof(memory_info))) |
| break; |
| size_t size = std::min((memory_info.RegionSize + kMask64k) & ~kMask64k, |
| static_cast<SIZE_T>(end - ptr)); |
| if (ptr && memory_info.State == MEM_FREE) |
| ::VirtualAllocEx(process, ptr, size, MEM_RESERVE, PAGE_NOACCESS); |
| ptr += size; |
| } |
| } |
| #endif |
| |
| return true; |
| } |
| |
| MitigationFlags GetAllowedPostStartupProcessMitigations() { |
| return MITIGATION_HEAP_TERMINATE | |
| MITIGATION_DEP | |
| MITIGATION_DEP_NO_ATL_THUNK | |
| MITIGATION_RELOCATE_IMAGE | |
| MITIGATION_RELOCATE_IMAGE_REQUIRED | |
| MITIGATION_BOTTOM_UP_ASLR | |
| MITIGATION_STRICT_HANDLE_CHECKS | |
| MITIGATION_EXTENSION_POINT_DISABLE | |
| MITIGATION_DLL_SEARCH_ORDER | |
| MITIGATION_HARDEN_TOKEN_IL_POLICY | |
| MITIGATION_WIN32K_DISABLE | |
| MITIGATION_DYNAMIC_CODE_DISABLE | |
| MITIGATION_DYNAMIC_CODE_DISABLE_WITH_OPT_OUT | |
| MITIGATION_FORCE_MS_SIGNED_BINS | |
| MITIGATION_NONSYSTEM_FONT_DISABLE | |
| MITIGATION_IMAGE_LOAD_NO_REMOTE | |
| MITIGATION_IMAGE_LOAD_NO_LOW_LABEL | |
| MITIGATION_IMAGE_LOAD_PREFER_SYS32; |
| } |
| |
| bool CanSetProcessMitigationsPostStartup(MitigationFlags flags) { |
| // All of these mitigations can be enabled after startup. |
| return !(flags & ~GetAllowedPostStartupProcessMitigations()); |
| } |
| |
| bool CanSetProcessMitigationsPreStartup(MitigationFlags flags) { |
| // These mitigations cannot be enabled prior to startup. |
| return !(flags & |
| (MITIGATION_STRICT_HANDLE_CHECKS | MITIGATION_DLL_SEARCH_ORDER)); |
| } |
| |
| bool CanSetMitigationsPerThread(MitigationFlags flags) { |
| // If any flags EXCEPT these are set, fail. |
| if (flags & ~(MITIGATION_DYNAMIC_CODE_OPT_OUT_THIS_THREAD)) |
| return false; |
| |
| return true; |
| } |
| |
| } // namespace sandbox |
