198477 2019-06-03 00:53:26 -0700 [JSC] JSObject::attemptToInterceptPutByIndexOnHole should use getPrototype instead of getPrototypeDirect 2019-06-04 15:08:53 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ysuzuki ysuzuki commit-queue ews-watchlist keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1541189 0 ysuzuki 2019-06-03 00:53:26 -0700 ... 1541209 1 371184 ysuzuki 2019-06-03 02:59:42 -0700 Created attachment 371184 Patch 1541210 2 ysuzuki 2019-06-03 03:00:45 -0700 <rdar://problem/51299504> 1541254 3 371184 saam 2019-06-03 09:54:00 -0700 Comment on attachment 371184 Patch Why? Won't this lead to use calling getPrototypeOf twice on proxy? 1541257 4 371184 ysuzuki 2019-06-03 10:06:40 -0700 Comment on attachment 371184 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=371184&action=review Otherwise, as the test described (without this patch, it fails), object[10101010] = xxx; bypasses getPrototype (instead using getPrototypeDirect), which means that this [[Put]] access bypasses JSWindow::getPrototype. attemptToInterceptPutByIndexOnHoleForPrototype is not a side-effect free check. If put is intercepted, this function performs [[Put]]. > Source/JavaScriptCore/runtime/JSObject.cpp:2747 > if (current->type() == ProxyObjectType) { > + scope.release(); > ProxyObject* proxy = jsCast<ProxyObject*>(current); > putResult = proxy->putByIndexCommon(exec, thisValue, i, value, shouldThrow); > return true; For example, Proxy case goes into this path, and we actually performs [[Put]] here. 1541268 5 371184 ysuzuki 2019-06-03 10:57:48 -0700 Comment on attachment 371184 Patch Thanks 1541274 6 371184 commit-queue 2019-06-03 11:27:52 -0700 Comment on attachment 371184 Patch Clearing flags on attachment: 371184 Committed r246040: <https://trac.webkit.org/changeset/246040> 1541275 7 commit-queue 2019-06-03 11:27:54 -0700 All reviewed patches have been landed. Closing bug. 1541752 8 ysuzuki 2019-06-04 15:08:53 -0700 Committed r246084: <https://trac.webkit.org/changeset/246084> 371184 2019-06-03 02:59:42 -0700 2019-06-03 11:27:52 -0700 Patch bug-198477-20190603025939.patch text/plain 11821 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjQ2MDI0CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAy NWE1ZTM5NWI3Njc5MjQzMDA0MzZkYmVjOWUxZmVhNjczMmM0YTI4Li45YzY1NjY4ZDBmMmMzYTM3 ZDJiNjNmODZmZmRmNzdiM2ZjNDAyYWI2IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwyMiBAQAorMjAxOS0wNi0wMyAgWXVzdWtlIFN1enVraSAgPHlzdXp1a2lAYXBwbGUuY29t PgorCisgICAgICAgIFtKU0NdIEpTT2JqZWN0OjphdHRlbXB0VG9JbnRlcmNlcHRQdXRCeUluZGV4 T25Ib2xlIHNob3VsZCB1c2UgZ2V0UHJvdG90eXBlIGluc3RlYWQgb2YgZ2V0UHJvdG90eXBlRGly ZWN0CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xOTg0 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