205848 2020-01-07 00:34:43 -0800 Implementation of the class "extends" clause incorrectly uses __proto__ for setting prototypes 2020-08-25 00:46:18 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=157972 InRadar, WebExposed P2 Trivial --- 140491 1 claude.pache ashvayka ashvayka caitp ews-watchlist fpizlo keith_miller mark.lam msaboff rniwa saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1603475 0 claude.pache 2020-01-07 00:34:43 -0800 Control case: Object.defineProperty(Object.prototype, '__proto__', { configurable: true , set(x) { Reflect.setPrototypeOf(this, x); } }) class A extends Array { } Reflect.getPrototypeOf(A) === Array // true Reflect.getPrototypeOf(A.prototype) === Array.prototype // true "push" in (new A) // true Things become weird as soon as someone is removing Object.prototype.__proto__: delete Object.prototype.__proto__ class B extends Array { } Reflect.getPrototypeOf(B) === Array // false Reflect.getOwnPropertyDescriptor(B, '__proto__').value === Array // true Reflect.getPrototypeOf(B.prototype) === Array.prototype // false "push" in (new B) // false Or, said more clearly: Object.defineProperty(Object.prototype, '__proto__', { configurable: true , set(x) { throw new EvalError("Your code is bitrotten!"); } }) class C extends Array { } // EvalError: Your code is bitrotten! 1603478 1 claude.pache 2020-01-07 00:44:11 -0800 Related bug: #157972 1682488 2 407145 ashvayka 2020-08-24 15:48:50 -0700 Created attachment 407145 Patch 1682489 3 407145 keith_miller 2020-08-24 16:13:21 -0700 Comment on attachment 407145 Patch r=me. 1682599 4 ashvayka 2020-08-25 00:45:04 -0700 Committed r266106: <https://trac.webkit.org/changeset/266106> 1682600 5 webkit-bug-importer 2020-08-25 00:46:18 -0700 <rdar://problem/67723992> 407145 2020-08-24 15:48:50 -0700 2020-08-24 16:13:21 -0700 Patch bug-205848-20200825014848.patch text/plain 14619 ashvayka 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