mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 12:19:46 +00:00
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
/*
|
|
* Copyright (C) 2019 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 "Integrity.h"
|
|
|
|
#include "JSCellInlines.h"
|
|
#include "Options.h"
|
|
#include "VMInspectorInlines.h"
|
|
|
|
namespace JSC {
|
|
namespace Integrity {
|
|
|
|
namespace {
|
|
constexpr bool verbose = false;
|
|
}
|
|
|
|
Random::Random(VM& vm)
|
|
{
|
|
reloadAndCheckShouldAuditSlow(vm);
|
|
}
|
|
|
|
bool Random::reloadAndCheckShouldAuditSlow(VM& vm)
|
|
{
|
|
auto locker = holdLock(m_lock);
|
|
|
|
if (!Options::randomIntegrityAuditRate()) {
|
|
m_triggerBits = 0; // Never trigger, and don't bother reloading.
|
|
if (verbose)
|
|
dataLogLn("disabled Integrity audits: trigger bits ", RawPointer(reinterpret_cast<void*>(m_triggerBits)));
|
|
return false;
|
|
}
|
|
|
|
// Reload the trigger bits.
|
|
m_triggerBits = 1ull << 63;
|
|
|
|
uint32_t threshold = UINT_MAX * Options::randomIntegrityAuditRate();
|
|
for (int i = 0; i < numberOfTriggerBits; ++i) {
|
|
bool trigger = vm.random().getUint32() <= threshold;
|
|
m_triggerBits = m_triggerBits | (static_cast<uint64_t>(trigger) << i);
|
|
}
|
|
if (verbose)
|
|
dataLogLn("reloaded Integrity trigger bits ", RawPointer(reinterpret_cast<void*>(m_triggerBits)));
|
|
ASSERT(m_triggerBits >= (1ull << 63));
|
|
return vm.random().getUint32() <= threshold;
|
|
}
|
|
|
|
void auditCellFully(VM& vm, JSCell* cell)
|
|
{
|
|
VMInspector::verifyCell<VMInspector::ReleaseAssert>(vm, cell);
|
|
}
|
|
|
|
void auditCellMinimallySlow(VM&, JSCell* cell)
|
|
{
|
|
if (Gigacage::contains(cell)) {
|
|
if (cell->type() != JSImmutableButterflyType) {
|
|
if (verbose)
|
|
dataLogLn("Bad cell ", RawPointer(cell), " ", JSValue(cell));
|
|
CRASH();
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace Integrity
|
|
} // namespace JSC
|