229951 2021-09-06 02:27:01 -0700 IntrinsicGetterAccessCase implementation of __proto__ needs to handle get_by_id_with_this 2021-10-04 12:58:16 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build PC Linux RESOLVED FIXED InRadar P2 Normal --- 1 lukas.bernhard saam bfulgham ews-watchlist keith_miller mark.lam msaboff product-security saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1790656 0 lukas.bernhard 2021-09-06 02:27:01 -0700 During differential testing of webkit I found a sample triggering a miscomputation related to super.__proto__ field. Depending on optimization level the value unexpectedly becomes "null". The sample is invoked as: WebKitBuild/Release/bin/jsc --validateOptions=true --useConcurrentJIT=false --useConcurrentGC=false --thresholdForJITSoon=10 --thresholdForJITAfterWarmUp=10 --thresholdForOptimizeAfterWarmUp=100 --thresholdForOptimizeAfterLongWarmUp=100 --thresholdForOptimizeSoon=100 --thresholdForFTLOptimizeAfterWarmUp=1000 --thresholdForFTLOptimizeSoon=1000 --validateBCE=true --useFTLJIT=true sample.js Changing --useFTLJIT=true to false changes the output. function main() { let v41; v37 = class V37 { constructor() { v41 = super.__proto__; } }; for (let v70 = 0; v70 < 100; v70++) { // decreasing the loop count to other values, e.g. 20 changes the behavior new v37(); } print(v41); // outputs [object Object] or null, depending on --useFTLJIT=true/false } noDFG(main); noFTL(main); main(); 1790657 1 webkit-bug-importer 2021-09-06 02:27:13 -0700 <rdar://problem/82787527> 1799493 2 saam 2021-10-01 13:20:26 -0700 Our IntrinsicGetter IC is using the wrong structure 1799593 3 saam 2021-10-01 16:00:06 -0700 (In reply to Saam Barati from comment #2) > Our IntrinsicGetter IC is using the wrong structure This is wrong. It's using the wrong |this| for the "getter" access. 1799646 4 439938 saam 2021-10-01 17:06:58 -0700 Created attachment 439938 patch 1799711 5 439956 saam 2021-10-01 23:56:11 -0700 Created attachment 439956 patch 1799778 6 439956 ysuzuki 2021-10-02 15:39:28 -0700 Comment on attachment 439956 patch r=me 1800187 7 ews-feeder 2021-10-04 12:58:13 -0700 Committed r283512 (242480@main): <https://commits.webkit.org/242480@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 439956. 439938 2021-10-01 17:06:58 -0700 2021-10-01 23:56:11 -0700 patch c-backup.diff text/plain 9418 saam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyODM0MjYpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDE2IEBACisyMDIxLTEwLTAxICBTYWFtIEJhcmF0aSAgPHNiYXJhdGlAYXBwbGUu Y29tPgorCisgICAgICAgIEludHJpbnNpY0dldHRlckFjY2Vzc0Nhc2UgaW1wbGVtZW50YXRpb24g b2YgX19wcm90b19fIG5lZWRzIHRvIGhhbmRsZSBnZXRfYnlfaWRfd2l0aF90aGlzCisgICAgICAg IGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMjk5NTEKKyAgICAgICAg PHJkYXI6Ly9wcm9ibGVtLzgyNzg3NTI3PgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAo T09QUyEpLgorCisgICAgICAgICogc3RyZXNzL3J1bi1wcm90by1pbnRyaW5zaWMtZ2V0dGVyLXdp dGgtdGhpcy12YWx1ZS1pbi1nZXQtYnktaWQtd2l0aC10aGlzLmpzOiBBZGRlZC4KKyAgICAgICAg KGFzc2VydCk6CisgICAgICAgIChtYWluLnYzNyk6CisgICAgICAgIChtYWluKToKKwogMjAyMS0w 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