187411 2018-07-06 14:06:29 -0700 REGRESSION (r219757): Accessing response getter of XHR instance from IFRAME sets constructor to Object from the IFRAME 2018-07-24 21:47:46 -0700 1 1 1 Unclassified WebKit New Bugs Safari 11 Mac macOS 10.13 RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=174740 InRadar P2 Normal --- 174740 1 cvazac cdumez ap cdumez commit-queue ggaren keith_miller mark.lam rniwa saam sam webkit-bug-importer youennf oldest_to_newest 1439912 0 344453 cvazac 2018-07-06 14:06:29 -0700 Created attachment 344453 test case Scenario: base page with one same-origin IFRAME base page creates an XMLHttpRequest instance Issue: If the IFRAME adds a `readystatechange` listener to the XMLHttpRequest instance, and it reads the response getter before the `top` context does, the `constructor` of the object will be equivalent to `iframe.contentWindow.Object`, not `top.Object`. This "works" in other browsers, including Safari 10.0.1. Works in 604.5.6. Fails in 605.1.15. Code executed in the IFRAME: xhr.addEventListener('readystatechange', function(){ xhr.response }) From this point forward: xhr.response.constructor === iframe.contentWindow.Object xhr.response.constructor !== top.Object See https://cvazac.netlify.com/xhr-response-constructor/ for reproducible case. 1440088 1 webkit-bug-importer 2018-07-06 21:20:18 -0700 <rdar://problem/41920593> 1440576 2 cvazac 2018-07-09 15:03:02 -0700 I attempted to bisect the issue using: ./Tools/Scripts/bisect-builds -c release -p mac-highsierra -s 219162 -e 224949 But every build that attempts to launch gives me: Starting SafariForWebKitDevelopment with DYLD_FRAMEWORK_PATH set to point to built WebKit in /var/folders/33/prqh7l5n7fgd1l6d3kq6bq_r0000gy/T/tmpK9xc8x/Release. dyld: Symbol not found: __ZN3WTF8JSONImpl10ObjectBase6removeERKNS_6StringE Referenced from: /System/Library/PrivateFrameworks/WebInspector.framework/Versions/A/WebInspector Expected in: /var/folders/33/prqh7l5n7fgd1l6d3kq6bq_r0000gy/T/tmpK9xc8x/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore in /System/Library/PrivateFrameworks/WebInspector.framework/Versions/A/WebInspector 1440874 3 ap 2018-07-10 09:31:30 -0700 Yes, these WebKit revisions are so old that they don't work with latest Safari. I bisected to r219757. Sam, Chris, could you take a look? 1440887 4 cdumez 2018-07-10 09:47:06 -0700 Likely caused by us caching the response in the wrapper. 1443935 5 345483 cdumez 2018-07-20 15:34:38 -0700 Created attachment 345483 Patch 1444287 6 345483 cdumez 2018-07-23 09:41:30 -0700 Comment on attachment 345483 Patch ping review? 1444963 7 345483 commit-queue 2018-07-24 21:47:45 -0700 Comment on attachment 345483 Patch Clearing flags on attachment: 345483 Committed r234188: <https://trac.webkit.org/changeset/234188> 1444964 8 commit-queue 2018-07-24 21:47:46 -0700 All reviewed patches have been landed. Closing bug. 344453 2018-07-06 14:06:29 -0700 2018-07-06 14:06:29 -0700 test case xhr-response-constructor.zip application/zip 1545 cvazac UEsDBAoAAAAAAHxt5kwAAAAAAAAAAAAAAAAZABAAeGhyLXJlc3BvbnNlLWNvbnN0cnVjdG9yL1VY DACY2T9bbLg/W/4BWAJQSwMEFAAIAAgAk2vjTAAAAAAAAAAAAAAAACMAEAB4aHItcmVzcG9uc2Ut Y29uc3RydWN0b3IvaW5kZXguaHRtbFVYDABuwDtbVcA7W/4BWAKdVEFu2zAQvOcV21woIQV1byUD bWo0BRwkKAw0OdLixmIgkyy5sisE+XuXluM4kA202YtIaWbIGS5Vfvh2czm/v51CQ6t2clYOD+Aq G1R6GG6nsQ7G0+uLVBtjtdtIpfV0jZZmJhJaDJlondLiIzx0tibjbJY/veGl0q7uVkySS6Rpi2n4 tf+hE3cpcmksC13Nr2dQgVVrs1Tkguwihi9LhsIFiHIRJuJsJFw7GwnMQ1ArZPJ+nTqgItwtlYkB IPIRf/ggI/UtSm2ib1XPOsI6i+IkOtQJI4vdPOV4EvyuvADWKsCfJqRAcAN317MrIv8Tf3cYKRv7 gASWAaPnQHDe+5TG+WN09vzzCbDzaDPxfTrnvbAX5rou1BgLrUjJRBX5Me7OFyfPfujX0BURqfN7 iyx/aovvjOM/WuiiOspPJQ5DktveCV3NvQZVVQE5L28Wj1gTZLFxXathgcAIzD+B4CbM/pF+zPvz 0SyTYETLLlLWI8DzWGkfw8LpXirPh6gvG9PqbDiXt4wDgbI4vNRl8XrjyyR1cPm1WYPR1TbYSVnw 9IUzAJmbfhx/AVBLBwgFA0LurAEAAE8EAABQSwMEFAAIAAgAfG3mTAAAAAAAAAAAAAAAACQAEAB4 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