227988 2021-07-15 06:09:16 -0700 Grab the lock in FTL::Thunks::keyForSlowPathCallThunk 2021-07-16 16:40:09 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 saelo saam bfulgham ews-watchlist keith_miller mark.lam msaboff product-security saam tzagallo webkit-bug-importer oldest_to_newest 1777184 0 433579 saelo 2021-07-15 06:09:16 -0700 Created attachment 433579 Crashing sample The FTL::Thunks class [0] appears to be used to store shared fragments of code used by the FTL JIT. It provides two methods: MacroAssemblerCodeRef<JITThunkPtrTag> getSlowPathCallThunk(VM& vm, const SlowPathCallKey& key) { Locker locker { m_lock }; return generateIfNecessary(vm, m_slowPathCallThunks, key, slowPathCallThunkGenerator); // This does a HashTable::add } SlowPathCallKey keyForSlowPathCallThunk(MacroAssemblerCodePtr<JITThunkPtrTag> ptr) { return keyForThunk(m_slowPathCallThunks, ptr); // This does a HashTable::lookup } The keyForSlowPathCallThunk method seems to be called on the main thread during repatching (see stack trace below), while the getSlowPathCallThunk method can be called on a background JIT thread (this can e.g. be seen by setting a breakpoint on getSlowPathCallThunk or one of its callers, e.g. SlowPathCallContext::makeCall [1] and checking the thread that hits it). As such, there is a race condition here: the main thread doesn't attempt to take the lock when performing the lookup while the HashTable::add performed by the background thread can lead to a HashTable::rehash, and thus e.g. to the backing memory being freed. Frequently, winning this race seems to cause a RELEASE_ASSERT in FTL::Thunks::keyForThunk [2] to be hit (presumably because the rehash happens in place, and so the element isn't found), however, it can also cause memory corruption, as shown by the following ASAN report: ================================================================= ==936821==ERROR: AddressSanitizer: heap-use-after-free on address 0x6140000197a8 at pc 0x00000049bc5a bp 0x7ffffe183130 sp 0x7ffffe1828f8 READ of size 40 at 0x6140000197a8 thread T0 #0 0x49bc59 in __asan_memcpy (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x49bc59) #1 0x223b276 in JSC::FTL::ThunkMap<JSC::FTL::SlowPathCallKey>::KeyType JSC::FTL::keyForThunk<JSC::FTL::ThunkMap<JSC::FTL::SlowPathCallKey> >(JSC::FTL::ThunkMap<JSC::FTL::SlowPathCallKey>&, JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129>) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x223b276) #2 0x21ccc0c in JSC::ftlThunkAwareRepatchCall(JSC::CodeBlock*, JSC::CodeLocationCall<(WTF::PtrTag)26432>, JSC::FunctionPtr<(WTF::PtrTag)1>) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x21ccc0c) #3 0x21db0e2 in JSC::repatchPutByID(JSC::JSGlobalObject*, JSC::CodeBlock*, JSC::JSValue, JSC::Structure*, JSC::CacheableIdentifier, JSC::PutPropertySlot const&, JSC::StructureStubInfo&, JSC::PutKind) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x21db0e2) #4 0x1fe115e in JSC::operationPutByIdDirectNonStrictOptimize(JSC::JSGlobalObject*, JSC::StructureStubInfo*, long, long, unsigned long) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x1fe115e) #5 0x7f32f87be072 (<unknown module>) 0x6140000197a8 is located 360 bytes inside of 400-byte region [0x614000019640,0x6140000197d0) freed by thread T1 (JITWorker) here: #0 0x49c58d in free (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x49c58d) #1 0x1c2c397 in WTF::HashTable<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129>, WTF::KeyValuePair<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129>, JSC::FTL::SlowPathCallKey>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129>, JSC::FTL::SlowPathCallKey> >, WTF::DefaultHash<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129> >, WTF::HashMap<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129 >, JSC::FTL::SlowPathCallKey, WTF::DefaultHash<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129> >, WTF::HashTraits<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129> >, WTF::HashTraits<JSC::FTL::SlowPathCallKey>, WTF::HashTableTraits>::KeyValuePairTraits, WTF::HashTraits<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129> > >::rehash(unsigned int, WTF::KeyValuePair<JSC::MacroAssemblerCodePtr<(WTF::PtrTag)26129>, JSC::FTL::SlowPathCallK ey>*) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x1c2c397) previously allocated by thread T2 (JITWorker) here: #0 0x49c80d in malloc (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x49c80d) #1 0x49c334a in bmalloc::DebugHeap::malloc(unsigned long, bmalloc::FailureAction) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x49c334a) #2 0x1c24a0b in WTF::SharedTaskFunctor<void (JSC::LinkBuffer&), JSC::FTL::SlowPathCallContext::makeCall(JSC::VM&, JSC::FunctionPtr<(WTF::PtrTag)1>)::$_5>::run(JSC::LinkBuffer&) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x1c24a0b) #3 0x5ada3b in JSC::LinkBuffer::finalizeCodeWithoutDisassemblyImpl() (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x5ada3b) #4 0xe8cfc4 in JSC::MacroAssemblerCodeRef<(WTF::PtrTag)357> JSC::LinkBuffer::finalizeCodeWithoutDisassembly<(WTF::PtrTag)357>() (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0xe8cfc4) #5 0x1bd3a8e in JSC::FTL::link(JSC::FTL::State&) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x1bd3a8e) #6 0x100fddb in JSC::DFG::Plan::compileInThreadImpl() (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x100fddb) #7 0x205101c in JSC::JITPlan::compileInThread(JSC::JITWorklistThread*) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x205101c) #8 0x21ba282 in JSC::JITWorklistThread::work() (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x21ba282) #9 0x47e33da in WTF::Detail::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, void>::call() (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x47e33da) #10 0x48429df in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x48429df) #11 0x498a915 in WTF::wtfThreadEntryPoint(void*) (/home/builder/webkit/FuzzBuild/Release/bin/jsc+0x498a915) This likely happens when the background thread frees the m_table member after rehashing the table and after the main thread loaded the old value of the pointer during a lookup. The attached sample, found by Fuzzilli, appears to trigger this race sometimes, but very rarely. The sample is unfortunately not minimized as it isn't deterministic. I managed to trigger the above ASAN crash by compiling JSC on Linux with ./Tools/Scripts/build-jsc --jsc-only --release --cmakeargs="-DENABLE_STATIC_JSC=ON -DCMAKE_C_COMPILER='/usr/bin/clang-10' -DCMAKE_CXX_COMPILER='/usr/bin/clang++-10' -DCMAKE_C_FLAGS='-fsanitize=address' -DCMAKE_CXX_FLAGS='-fsanitize=address' -DCMAKE_EXE_LINKER_FLAGS='-fsanitize=address'" and repeatedly executing the attached sample with while true; do ASAN_OPTIONS=detect_leaks=0 ./FuzzBuild/Release/bin/jsc --thresholdForJITSoon=10 --thresholdForJITAfterWarmUp=10 --thresholdForOptimizeAfterWarmUp=100 --threshold ForOptimizeAfterLongWarmUp=100 --thresholdForOptimizeAfterLongWarmUp=100 --thresholdForFTLOptimizeAfterWarmUp=1000 --thresholdForFTLOptimizeSoon=1000 ftl_crash.js; done If it helps, I can see if it's possible to place some sleeps into the HashTable code to make the race easier to trigger. The bug was likely introduced by this commit: https://github.com/WebKit/WebKit/commit/934b072e307a52ef7c4bc75f6862635d7189e772 [0] https://github.com/WebKit/WebKit/blob/a1f561e19cfd520000fcb4f24f88d53b2a54d8b1/Source/JavaScriptCore/ftl/FTLThunks.h#L77 [1] https://github.com/WebKit/WebKit/blob/a1f561e19cfd520000fcb4f24f88d53b2a54d8b1/Source/JavaScriptCore/ftl/FTLSlowPathCall.cpp#L127 [2] https://github.com/WebKit/WebKit/blob/a1f561e19cfd520000fcb4f24f88d53b2a54d8b1/Source/JavaScriptCore/ftl/FTLThunks.h#L73 1777185 1 webkit-bug-importer 2021-07-15 06:09:26 -0700 <rdar://problem/80627901> 1777611 2 433707 saam 2021-07-16 14:56:33 -0700 Created attachment 433707 patch 1777613 3 433707 mark.lam 2021-07-16 14:59:41 -0700 Comment on attachment 433707 patch r=me 1777648 4 ews-feeder 2021-07-16 16:40:07 -0700 Committed r280008 (239750@main): <https://commits.webkit.org/239750@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433707. 433579 2021-07-15 06:09:16 -0700 2021-07-15 06:09:16 -0700 Crashing sample ftl_crash.js text/javascript 18909 saelo Ly8gUnVuIHdpdGggLS10aHJlc2hvbGRGb3JKSVRTb29uPTEwIC0tdGhyZXNob2xkRm9ySklUQWZ0 ZXJXYXJtVXA9MTAgLS10aHJlc2hvbGRGb3JPcHRpbWl6ZUFmdGVyV2FybVVwPTEwMCAtLXRocmVz aG9sZEZvck9wdGltaXplQWZ0ZXJMb25nV2FybVVwPTEwMCAtLXRocmVzaG9sZEZvck9wdGltaXpl QWZ0ZXJMb25nV2FybVVwPTEwMCAtLXRocmVzaG9sZEZvckZUTE9wdGltaXplQWZ0ZXJXYXJtVXA9 MTAwMCAtLXRocmVzaG9sZEZvckZUTE9wdGltaXplU29vbj0xMDAwCmZ1bmN0aW9uIG1haW4oKSB7 CmNvbnN0IHY0ID0gWzUzMzAuMDA2MDg4ODA0Njg2XTsKY29uc3QgdjUgPSBbLTE4MDk4NTkwODUs LTE4MDk4NTkwODUsLTE4MDk4NTkwODVdOwpjb25zdCB2NiA9IFtub0lubGluZSw1MzMwLjAwNjA4 ODgwNDY4NiwtMTgwOTg1OTA4NSxub0lubGluZSxub0lubGluZSxub0lubGluZSx2NF07CmNvbnN0 IHY3ID0ge307CmNvbnN0IHY4ID0gdjcuX19wcm90b19fOwpmdW5jdGlvbiB2OSh2MTAsdjExLHYx MikgewogICAgY29uc3QgdjEzID0gMTsKfQpmdW5jdGlvbiB2MTQodjE1LHYxNix2MTcsdjE4KSB7 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