185906 2018-05-23 02:47:53 -0700 Unexpected constructor / instanceof behavior when retrieving indexedDB data in an iframe 2018-11-29 10:53:20 -0800 1 1 1 Unclassified WebKit WebCore Misc. Safari 11 Mac macOS 10.13 RESOLVED FIXED InRadar P2 Normal --- 1 maxime.rety sihui_liu alecflett beidson cdumez commit-queue dbates dpaddock esprehn+autocc ews-watchlist ggaren jsbell kangil.han sihui_liu stefan webkit-bug-importer webkit ysuzuki oldest_to_newest 1426519 0 maxime.rety 2018-05-23 02:47:53 -0700 There's an unexpected behavior in Safari 11.1 after retrieving data from indexedDB inside an iframe: the values cannot be properly checked against constructors with instanceof. Pseudo code run in an iframe: // Store this record in indexedDB const record = { array: [1, 2, 3] }; // Same record retrieved later from indexedDB: const record = event.target.result; record.array instanceof Array; // expected true but false in Safari 11.1 record.array instanceof window.parent.Array; // expected false but true in Safari 11.1 Tested on Safari Version 11.1 (13605.1.33.1.4) on macOS High Sierra 10.13.4. The issue also occurs for Uint8Array, a.s.o. and probably all "constructed" types. A lot of libraries and home-made code rely on instanceof to work as expected on values retrieved from indexedDB in an iframe. Full test case: https://gist.github.com/maximerety/92431f6f4cc9ea8f684de8c124469995 Related issue: https://github.com/feross/buffer/issues/166 1426695 1 341118 webkit 2018-05-23 12:49:45 -0700 Created attachment 341118 Minimal test case I have attached a minimal test case that demonstrates the issue. Note: You cannot run this from a file:// URL, as those cannot create IndexedDB databases. I believe Safari also restricts IndexedDB databases in private browsing mode, so it must be a regular browser window. Expected output (in console) (you see this output in Chrome and Firefox): Testing in main context! result.array instanceof Array: true result.array instanceof window.top.Array: true Array.isArray(result.array): true result.arrayBuffer instanceof ArrayBuffer: true result.arrayBuffer instanceof window.top.ArrayBuffer: true Testing in iframe context! result.array instanceof Array: true result.array instanceof window.top.Array: false Array.isArray(result.array): true result.arrayBuffer instanceof ArrayBuffer: true result.arrayBuffer instanceof window.top.ArrayBuffer: false test complete. Actual output: [Log] Testing in main context! (idb_bug.html, line 36) [Log] result.array instanceof Array: true (idb_bug.html, line 23) [Log] result.array instanceof window.top.Array: true (idb_bug.html, line 24) [Log] Array.isArray(result.array): true (idb_bug.html, line 25) [Log] result.arrayBuffer instanceof ArrayBuffer: true (idb_bug.html, line 26) [Log] result.arrayBuffer instanceof window.top.ArrayBuffer: true (idb_bug.html, line 27) [Log] Testing in iframe context! (about:srcdoc, line 30) [Log] result.array instanceof Array: false (about:srcdoc, line 19) [Log] result.array instanceof window.top.Array: true (about:srcdoc, line 20) [Log] Array.isArray(result.array): true (about:srcdoc, line 21) [Log] result.arrayBuffer instanceof ArrayBuffer: false (about:srcdoc, line 22) [Log] result.arrayBuffer instanceof window.top.ArrayBuffer: true (about:srcdoc, line 23) [Log] test complete. (about:srcdoc, line 30) 1427793 2 webkit-bug-importer 2018-05-26 19:33:53 -0700 <rdar://problem/40583100> 1472064 3 stefan 2018-10-25 08:30:25 -0700 Possibly a duplicate of https://bugs.webkit.org/show_bug.cgi?id=182097 1482233 4 355815 sihui_liu 2018-11-27 16:37:15 -0800 Created attachment 355815 Patch 1482830 5 355815 ggaren 2018-11-28 20:27:32 -0800 Comment on attachment 355815 Patch r=me 1483029 6 355815 commit-queue 2018-11-29 10:41:57 -0800 Comment on attachment 355815 Patch Clearing flags on attachment: 355815 Committed r238676: <https://trac.webkit.org/changeset/238676> 1483030 7 commit-queue 2018-11-29 10:41:59 -0800 All reviewed patches have been landed. Closing bug. 1483038 8 sihui_liu 2018-11-29 10:53:20 -0800 *** Bug 182097 has been marked as a duplicate of this bug. *** 341118 2018-05-23 12:49:45 -0700 2018-05-23 12:49:45 -0700 Minimal test case idb_bug.html text/html 1917 webkit PCFkb2N0eXBlIGh0bWw+CjxodG1sPgogIDxzY3JpcHQgdHlwZT0idGV4dC9qYXZhc2NyaXB0Ij4K ICAgIHdpbmRvdy5vbmxvYWQgPSBmdW5jdGlvbigpIHsKICAgICAgZnVuY3Rpb24gdGVzdChjYikg ewogICAgICAgIGNvbnN0IHRlc3RkYiA9IGluZGV4ZWREQi5vcGVuKCd0ZXN0ZGInLCAxKTsKICAg ICAgICB0ZXN0ZGIub251cGdyYWRlbmVlZGVkID0gZnVuY3Rpb24oKSB7CiAgICAgICAgICBjb25z dCBkYiA9IHRlc3RkYi5yZXN1bHQ7CiAgICAgICAgICBkYi5jcmVhdGVPYmplY3RTdG9yZSgiVGVz dE9iamVjdHMiLCB7a2V5UGF0aDogImlkIn0pOwogICAgICAgIH07CiAgICAgICAgdGVzdGRiLm9u c3VjY2VzcyA9IGZ1bmN0aW9uKCkgewogICAgICAgICAgY29uc3QgZGIgPSB0ZXN0ZGIucmVzdWx0 OwogICAgICAgICAgY29uc3QgdHggPSBkYi50cmFuc2FjdGlvbigiVGVzdE9iamVjdHMiLCAicmVh ZHdyaXRlIik7CiAgICAgICAgICBjb25zdCBzdG9yZSA9IHR4Lm9iamVjdFN0b3JlKCJUZXN0T2Jq 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