[Webkit-unassigned] [Bug 102276] New: Object.getOwnPropertyDescriptor() on a non-strict function exposes strict "caller" property

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102276

           Summary: Object.getOwnPropertyDescriptor() on a non-strict
                    function exposes strict "caller" property
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: adamk at chromium.org
                CC: arv at chromium.org


The following code appropriately throws a TypeError as required by ECMAScript:

function nonStrict() { return nonStrict.caller; }
function strict() { "use strict"; return nonStrict() === strict; }
strict()

But the following code does not throw, and returns true:

function nonStrict() { return Object.getOwnPropertyDescriptor(nonStrict, 'caller').value; }
function strict() { "use strict"; return nonStrict() === strict; }
strict()

Though this is underspecified in the spec (it says that only [[Get]] should throw when asked for caller), it seems likely that [[GetOwnProperty]] should do the same, and that's what both Chrome and Firefox do.

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