163338 2016-10-12 10:01:46 -0700 Array.prototype.slice should not modify frozen objects 2016-10-12 11:31:09 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 mark.lam mark.lam fpizlo ggaren jfbastien keith_miller msaboff saam oldest_to_newest 1239338 0 mark.lam 2016-10-12 10:01:46 -0700 The ES6 spec for Array.prototype.slice (https://tc39.github.io/ecma262/#sec-array.prototype.slice) states that it uses the CreateDataPropertyOrThrow() (https://tc39.github.io/ecma262/#sec-createdatapropertyorthrow) to add items to the result array. The spec for CreateDataPropertyOrThrow states: "This abstract operation creates a property whose attributes are set to the same defaults used for properties created by the ECMAScript language assignment operator. Normally, the property will not already exist. If it does exist and is not configurable or if O is not extensible, [[DefineOwnProperty]] will return false causing this operation to throw a TypeError exception." Array.prototype.slice also uses a Set function (https://tc39.github.io/ecma262/#sec-set-o-p-v-throw) to set the "length" property and passes true for the Throw argument. Ultimately, it ends up calling the OrdinarySet function (https://tc39.github.io/ecma262/#sec-ordinaryset) that will fail if the property is not writable. This failure should result in a TypeError being thrown in Set. Since the properties of frozen objects are not extensible, not configurable, and not writeable, Array.prototype.slice should fail to write to the result array if it is frozen. 1239342 1 291364 mark.lam 2016-10-12 10:11:55 -0700 Created attachment 291364 proposed patch. 1239381 2 mark.lam 2016-10-12 11:31:09 -0700 Thanks for the review. Landed in r207226: <http://trac.webkit.org/r207226>. 291364 2016-10-12 10:11:55 -0700 2016-10-12 11:17:50 -0700 proposed patch. bug-163338.patch text/plain 7837 mark.lam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyMDcyMjIpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDEyIEBACisyMDE2LTEwLTEyICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNv bT4KKworICAgICAgICBBcnJheS5wcm90b3R5cGUuc2xpY2Ugc2hvdWxkIG5vdCBtb2RpZnkgZnJv emVuIG9iamVjdHMuCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNn aT9pZD0xNjMzMzgKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAg ICAgICAqIHN0cmVzcy9hcnJheS1zbGljZS1vbi1mcm96ZW4tb2JqZWN0LmpzOiBBZGRlZC4KKwog MjAxNi0xMC0xMSAgTWFyayBMYW0gIDxtYXJrLmxhbUBhcHBsZS5jb20+CiAKICAgICAgICAgQXJy YXkucHJvdG90eXBlLmNvbmNhdCBzaG91bGQgbm90IG1vZGlmeSBmcm96ZW4gb2JqZWN0cy4KSW5k 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