1 files changed, 104 insertions, 0 deletions
diff --git a/js/src/fuzz-tests/util/sanitize.js b/js/src/fuzz-tests/util/sanitize.js
new file mode 100644
index 0000000000..59d43a42bd
--- /dev/null
+++ b/js/src/fuzz-tests/util/sanitize.js
@@ -0,0 +1,104 @@
+/* -*- Mode: javascript; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This function can be used to "sanitize" a new global for fuzzing in such
+// a way that permanent side-effects, hangs and behavior that could be harmful
+// to libFuzzer targets is reduced to a minimum.
+function sanitizeGlobal(g) {
+  let lfFuncs = {
+    // Noisy functions (output)
+    backtrace: function() {},
+    getBacktrace: function() {},
+    help: function() {},
+    print: function(s) { return s.toString(); },
+    printErr: function(s) { return s.toString(); },
+    putstr: function(s) { return s.toString(); },
+    stackDump: function() {},
+    dumpHeap: function() {},
+    dumpScopeChain: function() {},
+    dumpObjectWrappers: function() {},
+    dumpGCArenaInfo: function() {},
+    printProfilerEvents: function() {},
+
+    // Harmful functions (hangs, timeouts, leaks)
+    getLcovInfo: function() {},
+    readline: function() {},
+    readlineBuf: function() {},
+    timeout: function() {},
+    quit: function() {},
+    interruptIf: function() {},
+    terminate: function() {},
+    invokeInterruptCallback: function() {},
+    setInterruptCallback: function() {},
+    intern: function() {},
+    evalInWorker: function() {},
+    sleep: function() {},
+    cacheEntry: function() {},
+    streamCacheEntry: function() {},
+    createMappedArrayBuffer: function() {},
+    wasmCompileInSeparateProcess: function() {},
+    gcparam: function() {},
+    newGlobal: function() { return g; },
+
+    // Harmful functions (throw)
+    assertEq: function(a,b) { return a.toString() == b.toString(); },
+    throwError: function() {},
+    reportOutOfMemory: function() {},
+    throwOutOfMemory: function() {},
+    reportLargeAllocationFailure: function() {},
+
+    // Functions that need limiting
+    gczeal: function(m, f) { return gczeal(m, 100); },
+    startgc: function(n, o) { startgc(n > 20 ? 20 : n, o); },
+    gcslice: function(n) { gcslice(n > 20 ? 20 : n); },
+
+    // Global side-effects
+    deterministicgc: function() {},
+    fullcompartmentchecks: function() {},
+    setIonCheckGraphCoherency: function() {},
+    enableShellAllocationMetadataBuilder: function() {},
+    setTimeResolution: function() {},
+    options: function() { return "tracejit,methodjit,typeinfer"; },
+    setJitCompilerOption: function() {},
+    clearLastWarning: function() {},
+    enableSingleStepProfiling: function() {},
+    disableSingleStepProfiling: function() {},
+    enableGeckoProfiling: function() {},
+    enableGeckoProfilingWithSlowAssertions: function() {},
+    disableGeckoProfiling: function() {},
+    enqueueJob: function() {},
+    globalOfFirstJobInQueue: function() {},
+    drainJobQueue: function() {},
+    setPromiseRejectionTrackerCallback: function() {},
+    startTimingMutator: function() {},
+    stopTimingMutator: function() {},
+    setModuleLoadHook: function() {},
+    // Left enabled, as it is required for now to avoid leaks
+    //setModuleResolveHook: function() {},
+    setModuleMetadataHook: function() {},
+    setModuleDynamicImportHook: function() {},
+    finishDynamicModuleImport: function() {},
+    abortDynamicModuleImport: function() {},
+    offThreadCompileScript: function() {},
+    runOffThreadScript: function() {},
+    offThreadCompileModule: function() {},
+    finishOffThreadModule: function() {},
+    offThreadDecodeScript: function() {},
+    runOffThreadDecodedScript: function() {},
+    addPromiseReactions: function() {},
+    ignoreUnhandledRejections: function() {},
+    enableTrackAllocations: function() {},
+    disableTrackAllocations: function() {},
+    startTraceLogger: function() {},
+    stopTraceLogger: function() {},
+    setTestFilenameValidationCallback: function() {},
+  };
+
+  for (let lfFunc in lfFuncs) {
+    g[lfFunc] = lfFuncs[lfFunc];
+  }
+
+  return g;
+}