30996 2009-11-01 13:24:07 -0800 `localStorage.setItem` can overwrite `localStorage` methods 2012-04-17 13:32:46 -0700 1 1 1 Unclassified WebKit DOM 528+ (Nightly build) Mac (Intel) OS X 10.6 RESOLVED FIXED P2 Normal --- 1 kangax benm abarth benm gojpeg haraken japhet jorlow michaeln oliver webkit.review.bot oldest_to_newest 159660 0 kangax 2009-11-01 13:24:07 -0800 It's currently possible to overwrite methods of `localStorage` simply by setting values of same-named keys through `setItem`: localStorage.setItem('clear', 'x'); localStorage.clear; // "x", not original "clear" method. This is rather destructive and probably shouldn't happen. Mozilla, for example, allows to overwrite methods of `localStorage` but only through direct accessors (localStorage.clear = 'x'). Using getItem/setItem allows to use any key and not worry about one of them overwriting actual `clearStorage` method. This still happens in r50383. Thank you. 179025 1 kangax 2010-01-09 12:40:46 -0800 Can anyone please comment on this? Still happens in r53036. 299056 2 jorlow 2010-10-25 13:04:39 -0700 There have been some WhatWG threads on this. I'm waiting on clarification by the spec editor. 368662 3 gojpeg 2011-03-16 17:11:13 -0700 Still present in r80833. 604050 4 benm 2012-04-17 08:43:10 -0700 There is a Chromium bug for this issue: http://code.google.com/p/chromium/issues/detail?id=110216 I have a patch for both JSC and V8 bindings with a layout test to follow shortly. 604058 5 137546 benm 2012-04-17 08:59:36 -0700 Created attachment 137546 patch and layout test Patch and layout test for this issue. This brings us in line with the implementation in FF and IE. 604066 6 137546 haraken 2012-04-17 09:12:04 -0700 Comment on attachment 137546 patch and layout test View in context: https://bugs.webkit.org/attachment.cgi?id=137546&action=review > Source/WebCore/bindings/v8/custom/V8StorageCustom.cpp:77 > + if (!info.Holder()->GetRealNamedPropertyInPrototypeChain(name).IsEmpty()) Nit: .IsEmpty() is not necessary. 604094 7 benm 2012-04-17 09:53:21 -0700 (In reply to comment #6) Thanks for the review! > (From update of attachment 137546 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=137546&action=review > > > Source/WebCore/bindings/v8/custom/V8StorageCustom.cpp:77 > > + if (!info.Holder()->GetRealNamedPropertyInPrototypeChain(name).IsEmpty()) > > Nit: .IsEmpty() is not necessary. Hm, I want to test whether there is a prototype property present (note the ! at the start of the condition) - removing the ! and .isEmpty() gives me a compiler error. 604095 8 haraken 2012-04-17 09:54:36 -0700 (In reply to comment #7) > Hm, I want to test whether there is a prototype property present (note the ! at the start of the condition) - removing the ! and .isEmpty() gives me a compiler error. Ah, got it. Then let's use .isEmpty(). Sorry for the confusion. 604101 9 benm 2012-04-17 10:01:46 -0700 (In reply to comment #8) > (In reply to comment #7) > > Hm, I want to test whether there is a prototype property present (note the ! at the start of the condition) - removing the ! and .isEmpty() gives me a compiler error. > > Ah, got it. Then let's use .isEmpty(). Sorry for the confusion. No problem, thanks! Will put it into the commit queue. Cheers, Ben 604293 10 137546 webkit.review.bot 2012-04-17 13:32:41 -0700 Comment on attachment 137546 patch and layout test Clearing flags on attachment: 137546 Committed r114427: <http://trac.webkit.org/changeset/114427> 604294 11 webkit.review.bot 2012-04-17 13:32:46 -0700 All reviewed patches have been landed. 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