135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
/*
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* Copyright (C) 2020-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/WTFConfig.h>
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#include <wtf/Gigacage.h>
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#include <wtf/Lock.h>
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#include <wtf/StdLibExtras.h>
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#if OS(DARWIN)
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#include <wtf/spi/cocoa/MachVMSPI.h>
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#include <mach/mach.h>
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#elif OS(LINUX)
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#include <sys/mman.h>
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#endif
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#include <mutex>
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#if ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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namespace WebConfig {
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alignas(WTF::ConfigAlignment) Slot g_config[WTF::ConfigSizeToProtect / sizeof(Slot)];
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} // namespace WebConfig
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#else // not ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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namespace WTF {
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Config g_wtfConfig;
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} // namespace WTF
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#endif // ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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namespace WTF {
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#if ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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void setPermissionsOfConfigPage()
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{
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#if OS(DARWIN)
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static std::once_flag onceFlag;
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std::call_once(onceFlag, [] {
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mach_vm_address_t addr = bitwise_cast<uintptr_t>(static_cast<void*>(WebConfig::g_config));
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auto flags = VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE;
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#if HAVE(VM_FLAGS_PERMANENT)
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flags |= VM_FLAGS_PERMANENT;
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#endif
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auto attemptVMMapping = [&] {
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return mach_vm_map(mach_task_self(), &addr, ConfigSizeToProtect, pageSize() - 1, flags, MEMORY_OBJECT_NULL, 0, false, VM_PROT_READ | VM_PROT_WRITE, VM_PROT_READ | VM_PROT_WRITE, VM_INHERIT_DEFAULT);
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};
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auto result = attemptVMMapping();
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#if HAVE(VM_FLAGS_PERMANENT)
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if (result != KERN_SUCCESS) {
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flags &= ~VM_FLAGS_PERMANENT;
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result = attemptVMMapping();
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}
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#endif
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RELEASE_ASSERT(result == KERN_SUCCESS);
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});
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#endif // OS(DARWIN)
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}
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#endif // ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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void Config::permanentlyFreeze()
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{
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static Lock configLock;
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Locker locker { configLock };
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RELEASE_ASSERT(roundUpToMultipleOf(pageSize(), ConfigSizeToProtect) == ConfigSizeToProtect);
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if (!g_wtfConfig.isPermanentlyFrozen) {
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g_wtfConfig.isPermanentlyFrozen = true;
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#if GIGACAGE_ENABLED
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g_gigacageConfig.isPermanentlyFrozen = true;
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#endif
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}
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int result = 0;
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#if ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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#if OS(DARWIN)
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enum {
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AllowPermissionChangesAfterThis = false,
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DisallowPermissionChangesAfterThis = true
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};
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// There's no going back now!
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result = vm_protect(mach_task_self(), reinterpret_cast<vm_address_t>(&WebConfig::g_config), ConfigSizeToProtect, DisallowPermissionChangesAfterThis, VM_PROT_READ);
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#elif OS(LINUX)
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result = mprotect(&WebConfig::g_config, ConfigSizeToProtect, PROT_READ);
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#elif OS(WINDOWS)
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// FIXME: Implement equivalent, maybe with VirtualProtect.
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// Also need to fix WebKitTestRunner.
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// Note: the Windows port also currently does not support a unified Config
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// record, which is needed for the current form of the freezing feature to
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// work. See comments in PlatformEnable.h for UNIFIED_AND_FREEZABLE_CONFIG_RECORD.
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#endif
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#endif // ENABLE(UNIFIED_AND_FREEZABLE_CONFIG_RECORD)
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RELEASE_ASSERT(!result);
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RELEASE_ASSERT(g_wtfConfig.isPermanentlyFrozen);
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}
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} // namespace WTF
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