222228 2021-02-20 02:32:42 -0800 Regression(r268700) postMessage changes prototype of basic types 2021-02-24 22:54:37 -0800 1 1 1 Unclassified WebKit WebCore JavaScript Safari Technology Preview Mac (Intel) macOS 11 RESOLVED FIXED InRadar P4 Critical --- 217912 1 stefan cdumez cdumez darin esprehn+autocc ews-watchlist fpizlo ggaren hi joepeck kangil.han keith_miller webkit-bug-importer ysuzuki oldest_to_newest 1731786 0 stefan 2021-02-20 02:32:42 -0800 Execute this in the current Safari Tech Preview (120): >window.addEventListener('message', event => { > console.log('is Object after postMessage?: ', event.data instanceof Object) > console.log('is Array after postMessage?: ', event.data.array instanceof Array) >}) >const testObject = { > array: [ 1, 2, 3, 4 ] >}; >console.log('is Object before postMessage?: ', testObject instanceof Object) >console.log('is Array before postMessage?: ', testObject.array instanceof Array) >window.postMessage(testObject); This probably extends to other build-in types like Map, Set, ArrayBuffer and the like... This applies to Safari Tech Preview 120 and is not present in Safari 14.0.3. 1731787 1 stefan 2021-02-20 02:38:37 -0800 I experienced this previously when dealing with data read from IndexedDB in an iframe: bug 185906 and bug 182097. 1731790 2 stefan 2021-02-20 02:40:16 -0800 Here is a demo: https://codepen.io/sechel/pen/xxRLPKp Check the dev console. 1732296 3 webkit-bug-importer 2021-02-22 14:02:12 -0800 <rdar://problem/74612853> 1732318 4 ysuzuki 2021-02-22 15:04:23 -0800 This is Structured Cloning related, so WebCore. 1732924 5 cdumez 2021-02-24 09:53:27 -0800 Indeed, I see this in STP 120: [Log] is Object before postMessage?: – true (iframeConsoleRunner-7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) [Log] is Array before postMessage?: – true (iframeConsoleRunner-7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) [Log] is Object after postMessage?: – false (iframeConsoleRunner-7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) [Log] is Array after postMessage?: – false (iframeConsoleRunner-7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) and this in my System Safari: [Log] is Object before postMessage?: – true (xxRLPKp, line 52) [Log] is Array before postMessage?: – true (xxRLPKp, line 53) [Log] is Object after postMessage?: – true (xxRLPKp, line 45) [Log] is Array after postMessage?: – true (xxRLPKp, line 46) I will bisect. 1732937 6 cdumez 2021-02-24 10:14:55 -0800 (In reply to Chris Dumez from comment #5) > Indeed, I see this in STP 120: > [Log] is Object before postMessage?: – true > (iframeConsoleRunner- > 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) > [Log] is Array before postMessage?: – true > (iframeConsoleRunner- > 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) > [Log] is Object after postMessage?: – false > (iframeConsoleRunner- > 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) > [Log] is Array after postMessage?: – false > (iframeConsoleRunner- > 7f4d47902dc785f30dedcac9c996b9f31d4dfcc33567cc48f0431bc918c2bf05.js, line 1) > > and this in my System Safari: > [Log] is Object before postMessage?: – true (xxRLPKp, line 52) > [Log] is Array before postMessage?: – true (xxRLPKp, line 53) > [Log] is Object after postMessage?: – true (xxRLPKp, line 45) > [Log] is Array after postMessage?: – true (xxRLPKp, line 46) > > I will bisect. Never mind, I am not actually seeing a recent regression. The difference I saw was before and after a reload. If I load https://codepen.io/sechel/pen/xxRLPKp, I see: [Log] is Object before postMessage?: – true [Log] is Array before postMessage?: – true [Log] is Object after postMessage?: – true [Log] is Array after postMessage?: – true If I press the reload button, I see: [Log] is Object before postMessage?: – true [Log] is Array before postMessage?: – true [Log] is Object after postMessage?: – false [Log] is Array after postMessage?: – false I see this behavior in STP 120 as well as in older WebKit builds... 1732949 7 cdumez 2021-02-24 10:29:03 -0800 Ok, looks like I had not gone far back enough. r267039: GOOD r269041: BAD In the good build, results are good even after the reload. It smells like a JSC bug to me but I guess we'll see after bisection. 1732965 8 cdumez 2021-02-24 10:59:15 -0800 Regression range: https://trac.webkit.org/log/webkit/trunk?mode=follow_copy&rev=268700&stop_rev=268698 Almost certainly from http://trac.webkit.org/r268700, which I wrote :S Investigating.. 1733004 9 cdumez 2021-02-24 11:47:49 -0800 Seems it was caused by this part of the change: JSC::JSGlobalObject* ScriptExecutionContext::globalObject() { - if (is<Document>(*this)) { - Document& document = downcast<Document>(*this); - auto* frame = document.frame(); - return frame ? frame->script().globalObject(mainThreadNormalWorld()) : nullptr; - } + if (is<Document>(*this)) + return WebCore::globalObject(mainThreadNormalWorld(), downcast<Document>(*this).page()); 1733005 10 cdumez 2021-02-24 11:50:24 -0800 (In reply to Chris Dumez from comment #9) > Seems it was caused by this part of the change: > > JSC::JSGlobalObject* ScriptExecutionContext::globalObject() > { > - if (is<Document>(*this)) { > - Document& document = downcast<Document>(*this); > - auto* frame = document.frame(); > - return frame ? > frame->script().globalObject(mainThreadNormalWorld()) : nullptr; > - } > + if (is<Document>(*this)) > + return WebCore::globalObject(mainThreadNormalWorld(), > downcast<Document>(*this).page()); Oh, I think the issue is that WebCore::globalObject() ends up using the main frame's scriptController instead of the current frame's scriptController. Will fix shortly. 1733026 11 cdumez 2021-02-24 12:34:15 -0800 I am struggling a bit to write a layout test that reproduces the issue. What seems to trigger the bug in Safari is to have Web Inspector open when the test is running. 1733039 12 421445 cdumez 2021-02-24 13:01:50 -0800 Created attachment 421445 Patch 1733057 13 421445 ggaren 2021-02-24 13:35:01 -0800 Comment on attachment 421445 Patch r=me 1733072 14 ews-feeder 2021-02-24 14:03:45 -0800 Committed r273438: <https://commits.webkit.org/r273438> All reviewed patches have been landed. Closing bug and clearing flags on attachment 421445. 1733228 15 stefan 2021-02-24 22:54:37 -0800 Thank you. 421445 2021-02-24 13:01:50 -0800 2021-02-24 14:03:47 -0800 Patch bug-222228-20210224130149.patch text/plain 8928 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjczMzU5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZmIyMTc5NTgyYTM3YWY5 ZDJhN2JjMWQzNDBmYTM5YWIyMWE3YTBhMC4uMjZmMjk1MzBmODdmZWYyNTMyMzkyN2UzODJkNjNm MWRjZGZiMWMyMiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDMzIEBACisyMDIxLTAyLTI0ICBDaHJp cyBEdW1leiAgPGNkdW1lekBhcHBsZS5jb20+CisKKyAgICAgICAgUmVncmVzc2lvbihyMjY4NzAw KSBwb3N0TWVzc2FnZSBjaGFuZ2VzIHByb3RvdHlwZSBvZiBiYXNpYyB0eXBlcworICAgICAgICBo dHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjIyMjI4CisgICAgICAgIDxy ZGFyOi8vcHJvYmxlbS83NDYxMjg1Mz4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9P UFMhKS4KKworICAgICAgICByMjY4NzAwIHVwZGF0ZWQgU2NyaXB0RXhlY3V0aW9uQ29udGV4dDo6 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