/* * Copyright (C) 2020 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include <wtf/WTFConfig.h> #include <wtf/Gigacage.h> #include <wtf/Lock.h> #include <wtf/StdLibExtras.h> #if OS(DARWIN) #include <mach/mach.h> #elif OS(LINUX) #include <sys/mman.h> #endif namespace WebConfig { alignas(WTF::ConfigSizeToProtect) Slot g_config[WTF::ConfigSizeToProtect / sizeof(Slot)]; } // namespace WebConfig namespace WTF { void Config::permanentlyFreeze() { static Lock configLock; auto locker = holdLock(configLock); RELEASE_ASSERT(roundUpToMultipleOf(pageSize(), ConfigSizeToProtect) == ConfigSizeToProtect); if (!g_wtfConfig.isPermanentlyFrozen) { g_wtfConfig.isPermanentlyFrozen = true; #if GIGACAGE_ENABLED g_gigacageConfig.isPermanentlyFrozen = true; #endif } int result = 0; #if OS(DARWIN) enum { AllowPermissionChangesAfterThis = false, DisallowPermissionChangesAfterThis = true }; // There's no going back now! result = vm_protect(mach_task_self(), reinterpret_cast<vm_address_t>(&WebConfig::g_config), ConfigSizeToProtect, DisallowPermissionChangesAfterThis, VM_PROT_READ); #elif OS(LINUX) result = mprotect(&WebConfig::g_config, ConfigSizeToProtect, PROT_READ); #elif OS(WINDOWS) // FIXME: Implement equivalent, maybe with VirtualProtect. // Also need to fix WebKitTestRunner. #endif RELEASE_ASSERT(!result); RELEASE_ASSERT(g_wtfConfig.isPermanentlyFrozen); } } // namespace WTF