230804 2021-09-26 02:05:29 -0700 The DFG/FTL need to be aware that Proxy's can produce "function" for typeof and might be callable 2021-09-30 13:38:06 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build PC Linux RESOLVED FIXED InRadar P2 Normal --- 1 lukas.bernhard saam bfulgham ews-watchlist keith_miller mark.lam msaboff product-security saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1797282 0 lukas.bernhard 2021-09-26 02:05:29 -0700 Differential testing identifies the following samples to trigger a miscomputation in FTL. Tested on 29c8d02c3b11c096cc67d89e5cfe8c16be42b3b7 (Fri Sep 24 09:39:18 2021 +0000) ./Release/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 diff.js function main() { let v162; const v25 = {__proto__:"name"}; for (let v113 = 0; v113 < 255; v113++) { const v141 = new Proxy(Object,v25); const v145 = v141["bind"](); // when running with FTL, the previous line raises a JS exception: // TypeError: |this| is not a function inside Function.prototype.bind // without FTL or in v8 this doesn't throw. } } main(); 1797283 1 webkit-bug-importer 2021-09-26 02:05:40 -0700 <rdar://problem/83543951> 1798713 2 saam 2021-09-29 17:58:48 -0700 *** Bug 231002 has been marked as a duplicate of this bug. *** 1798715 3 439687 saam 2021-09-29 18:17:57 -0700 Created attachment 439687 patch 1798718 4 439689 saam 2021-09-29 18:25:38 -0700 Created attachment 439689 patch 1798751 5 439689 ysuzuki 2021-09-29 21:36:31 -0700 Comment on attachment 439689 patch r=me 1799013 6 ews-feeder 2021-09-30 13:38:04 -0700 Committed r283332 (242353@main): <https://commits.webkit.org/242353@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 439689. 439687 2021-09-29 18:17:57 -0700 2021-09-29 18:25:38 -0700 patch c-backup.diff text/plain 8420 saam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyODMyOTEpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDIzIEBACisyMDIxLTA5LTI5ICBTYWFtIEJhcmF0aSAgPHNiYXJhdGlAYXBwbGUu Y29tPgorCisgICAgICAgIFRoZSBERkcvRlRMIG5lZWQgdG8gYmUgYXdhcmUgdGhhdCBQcm94eSdz IGNhbiBwcm9kdWNlICJmdW5jdGlvbiIgZm9yIHR5cGVvZiBhbmQgbWlnaHQgYmUgY2FsbGFibGUK KyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIzMDgwNAor ICAgICAgICA8cmRhcjovL3Byb2JsZW0vODM1NDM5NTE+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkg Tk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgKiBzdHJlc3MvYWktdHlwZW9mLW5lZWRzLXRvLWJl LWF3YXJlLW9mLXByb3h5LTIuanM6IEFkZGVkLgorICAgICAgICAoYXNzZXJ0KToKKyAgICAgICAg KGJ1aWx0aW4udm0uY3JlYXRlQnVpbHRpbik6CisgICAgICAgIChidWlsdGluMi52bS5jcmVhdGVC 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