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/*
* Copyright (C) 2015 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 "ExecutableAllocationFuzz.h"
#include "TestRunnerUtils.h"
#include <wtf/Atomics.h>
#include <wtf/DataLog.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/WeakRandom.h>
namespace JSC {
static Atomic<unsigned> s_numberOfExecutableAllocationFuzzChecks;
unsigned numberOfExecutableAllocationFuzzChecks()
{
return s_numberOfExecutableAllocationFuzzChecks.load();
}
ExecutableAllocationFuzzResult doExecutableAllocationFuzzing()
{
ASSERT(Options::useExecutableAllocationFuzz());
if (Options::fireExecutableAllocationFuzzRandomly()) {
static LazyNeverDestroyed<WeakRandom> random;
static std::once_flag once;
std::call_once(once, [] () {
random.construct();
});
static Lock fuzzingLock;
Locker locker { fuzzingLock };
if (random->returnTrueWithProbability(Options::fireExecutableAllocationFuzzRandomlyProbability()))
return PretendToFailExecutableAllocation;
return AllowNormalExecutableAllocation;
}
unsigned oldValue;
unsigned newValue;
do {
oldValue = s_numberOfExecutableAllocationFuzzChecks.load();
newValue = oldValue + 1;
} while (!s_numberOfExecutableAllocationFuzzChecks.compareExchangeWeak(oldValue, newValue));
if (newValue == Options::fireExecutableAllocationFuzzAt()) {
if (Options::verboseExecutableAllocationFuzz()) {
dataLog("Will pretend to fail executable allocation.\n");
WTFReportBacktrace();
}
return PretendToFailExecutableAllocation;
}
if (Options::fireExecutableAllocationFuzzAtOrAfter()
&& newValue >= Options::fireExecutableAllocationFuzzAtOrAfter()) {
if (Options::verboseExecutableAllocationFuzz()) {
dataLog("Will pretend to fail executable allocation.\n");
WTFReportBacktrace();
}
return PretendToFailExecutableAllocation;
}
return AllowNormalExecutableAllocation;
}
} // namespace JSC
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