232966 2021-11-10 13:56:56 -0800 GetMyArgumentByValOutOfBounds needs to check for negative indices 2021-11-30 12:00:55 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build PC Linux RESOLVED FIXED InRadar P2 Normal --- 1 lukas.bernhard saam ews-watchlist keith_miller lukas.bernhard mark.lam msaboff saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1813787 0 lukas.bernhard 2021-11-10 13:56:56 -0800 During differential testing of webkit I found a sample triggering a miscomputation in FTL. JSC on git commit: 93d2e7bf275b Build options: ./Tools/Scripts/build-jsc --jsc-only --release --cmakeargs="-ENABLE_STATIC_JSC=ON -DCMAKE_C_COMPILER='/usr/bin/clang-12' -DCMAKE_CXX_COMPILER='/usr/bin/clang++-12' -DCMAKE_CXX_FLAGS='-fsanitize-coverage=trace-pc-guard -O3 -lrt -fuse-ld=lld'" WebKitBuild/Debug/bin/jsc --validateOptions=true --useConcurrentJIT=false --useConcurrentGC=false --thresholdForJITSoon=10 --thresholdForJITAfterWarmUp=10 --thresholdForOptimizeAfterWarmUp=100 --thresholdForOptimizeAfterLongWarmUp=100 --thresholdForOptimizeSoon=100 --thresholdForFTLOptimizeAfterWarmUp=1000 --thresholdForFTLOptimizeSoon=1000 --validateBCE=true --useFTLJIT=true sample.js ``` function main() { let v26; const v13 = [0, 0]; v16 = [0]; const v18 = v16.__proto__; const v23 = (v24,...v25) => { v26 = v25[-80887344]; }; v18[-80887344] = v13; for (let v30 = -256; v30 < 100; v30++) { const v31 = v23(0); } print(v26); // 0,0 without FTL, undefined without FTL } noDFG(main); main(); ``` 1813933 1 lukas.bernhard 2021-11-10 23:53:42 -0800 The comment in the sample is incorrect, instead of ``` // 0,0 without FTL, undefined without FTL ``` it should be: ``` // 0,0 without FTL, undefined with FTL. (also 0,0 in spidermonkey) ``` 1816098 2 webkit-bug-importer 2021-11-17 13:57:21 -0800 <rdar://problem/85519898> 1818554 3 445366 saam 2021-11-29 17:36:51 -0800 Created attachment 445366 Patch 1818557 4 445367 saam 2021-11-29 17:42:27 -0800 Created attachment 445367 patch 1818565 5 445367 ysuzuki 2021-11-29 17:48:38 -0800 Comment on attachment 445367 patch r=me 1818566 6 445367 saam 2021-11-29 17:50:12 -0800 Comment on attachment 445367 patch View in context: https://bugs.webkit.org/attachment.cgi?id=445367&action=review > Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp:5668 > + LValue isOutOfBounds = m_out.aboveOrEqual(indexToCheck, numberOfArgs); I'll clean up the scope of the numberOfArgumentsToSkip since we no longer use it here. 1818569 7 445370 saam 2021-11-29 17:51:30 -0800 Created attachment 445370 patch for landing 1818863 8 ews-feeder 2021-11-30 12:00:53 -0800 Committed r286312 (244671@main): <https://commits.webkit.org/244671@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 445370. 445366 2021-11-29 17:36:51 -0800 2021-11-29 17:42:27 -0800 Patch b-backup.diff text/plain 6617 saam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyODYyNzYpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDIzIEBACisyMDIxLTExLTI5ICBTYWFtIEJhcmF0aSAgPHNiYXJhdGlAYXBwbGUu Y29tPgorCisgICAgICAgIEdldE15QXJndW1lbnRCeVZhbE91dE9mQm91bmRzIG5lZWRzIHRvIGNo ZWNrIGZvciBuZWdhdGl2ZSBpbmRpY2VzCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3Jn L3Nob3dfYnVnLmNnaT9pZD0yMzI5NjYKKyAgICAgICAgPHJkYXI6Ly9wcm9ibGVtLzg1NTE5ODk4 PgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgICogZ2V0 LW15LWFyZ3VtZW50LWJ5LXZhbC1uZWdhdGl2ZS0xLmpzOiBBZGRlZC4KKyAgICAgICAgKGFzc2Vy dCk6CisgICAgICAgIChtYWluKToKKyAgICAgICAgKiBnZXQtbXktYXJndW1lbnQtYnktdmFsLW5l Z2F0aXZlLTIuanM6IEFkZGVkLgorICAgICAgICAoYXNzZXJ0KToKKyAgICAgICAgKG1haW4uY29u 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