175693 2017-08-17 16:08:53 -0700 WebAssembly: const in unreachable code decoded incorrectly, erroneously rejects binary as invalid 2017-08-17 18:04:06 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Linux RESOLVED FIXED InRadar P2 Normal --- 1 alonzakai jfbastien bfulgham buildbot commit-queue jfbastien keith_miller mark.lam msaboff product-security saam webkit-bug-importer oldest_to_newest 1339819 0 318433 alonzakai 2017-08-17 16:08:53 -0700 Created attachment 318433 js script Running jsc b.js -- b.wasm it reports Exception: Error: WebAssembly.Module doesn't parse at byte 287 / 321: can't get immediate for I64Const in unreachable context, in function at index 0 (evaluating 'new WebAssembly.Module(binary)') Module@[native code] global code@b.js:22:63 However the wasm binary is valid (accepted by v8, sm, binaryen, wabt). 1339821 1 webkit-bug-importer 2017-08-17 16:09:14 -0700 <rdar://problem/33952443> 1339822 2 318434 alonzakai 2017-08-17 16:09:15 -0700 Created attachment 318434 wasm file 1339840 3 jfbastien 2017-08-17 16:31:17 -0700 I believe this is a benign bug because unreachable code shouldn't occur anyways. It's still a bug we should fix, though. 1339842 4 jfbastien 2017-08-17 16:32:17 -0700 It looks like the i64.const causing the issue is: 42 80 80 80 80 80 80 80 80 80 | i64.const -9223372036854775808 1339844 5 jfbastien 2017-08-17 16:33:38 -0700 Well this is our bug: // one immediate cases case I32Const: case I64Const: // <------ derp case SetLocal: case GetLocal: case TeeLocal: case GetGlobal: case SetGlobal: case Br: case BrIf: case Call: { uint32_t unused; WASM_PARSER_FAIL_IF(!parseVarUInt32(unused), "can't get immediate for ", m_currentOpcode, " in unreachable context"); return { }; } This is benign, not a security issue. 1339849 6 318440 jfbastien 2017-08-17 16:43:33 -0700 Created attachment 318440 patch 1339852 7 318440 saam 2017-08-17 16:44:39 -0700 Comment on attachment 318440 patch please add test 1339857 8 318443 jfbastien 2017-08-17 16:58:50 -0700 Created attachment 318443 patch Add test, and also handle i32.const / i64.const as signed. 1339858 9 318443 commit-queue 2017-08-17 16:59:52 -0700 Comment on attachment 318443 patch Rejecting attachment 318443 from commit-queue. Failed to run "['/Volumes/Data/EWS/WebKit/Tools/Scripts/webkit-patch', '--status-host=webkit-queues.webkit.org', '--bot-id=webkit-cq-02', 'validate-changelog', '--check-oops', '--non-interactive', 318443, '--port=mac']" exit_code: 1 cwd: /Volumes/Data/EWS/WebKit ChangeLog entry in JSTests/ChangeLog contains OOPS!. Full output: http://webkit-queues.webkit.org/results/4333352 1339860 10 318444 jfbastien 2017-08-17 17:08:59 -0700 Created attachment 318444 patch Fix OOPS. 1339882 11 commit-queue 2017-08-17 18:03:28 -0700 The commit-queue encountered the following flaky tests while processing attachment 318444: svg/animations/smil-leak-list-property-instances.svg bug 175701 (author: sabouhallawa@apple.com) The commit-queue is continuing to process your patch. 1339883 12 318444 commit-queue 2017-08-17 18:04:03 -0700 Comment on attachment 318444 patch Clearing flags on attachment: 318444 Committed r220894: <http://trac.webkit.org/changeset/220894> 1339884 13 commit-queue 2017-08-17 18:04:06 -0700 All reviewed patches have been landed. Closing bug. 318433 2017-08-17 16:08:53 -0700 2017-08-17 16:08:53 -0700 js script b.js application/x-javascript 1152 alonzakai aWYgKHR5cGVvZiBjb25zb2xlID09PSAndW5kZWZpbmVkJykgewogIGNvbnNvbGUgPSB7IGxvZzog cHJpbnQgfTsKfQp2YXIgYmluYXJ5OwppZiAodHlwZW9mIHByb2Nlc3MgPT09ICdvYmplY3QnICYm IHR5cGVvZiByZXF1aXJlID09PSAnZnVuY3Rpb24nIC8qIG5vZGUuanMgZGV0ZWN0aW9uICovKSB7 CiAgdmFyIGFyZ3MgPSBwcm9jZXNzLmFyZ3Yuc2xpY2UoMik7CiAgYmluYXJ5ID0gcmVxdWlyZSgn ZnMnKS5yZWFkRmlsZVN5bmMoYXJnc1swXSk7CiAgaWYgKCFiaW5hcnkuYnVmZmVyKSBiaW5hcnkg PSBuZXcgVWludDhBcnJheShiaW5hcnkpOwp9IGVsc2UgewogIHZhciBhcmdzOwogIGlmICh0eXBl b2Ygc2NyaXB0QXJncyAhPSAndW5kZWZpbmVkJykgewogICAgYXJncyA9IHNjcmlwdEFyZ3M7CiAg fSBlbHNlIGlmICh0eXBlb2YgYXJndW1lbnRzICE9ICd1bmRlZmluZWQnKSB7CiAgICBhcmdzID0g YXJndW1lbnRzOwogIH0KICBpZiAodHlwZW9mIHJlYWRidWZmZXIgPT09ICdmdW5jdGlvbicpIHsK ICAgIGJpbmFyeSA9IG5ldyBVaW50OEFycmF5KHJlYWRidWZmZXIoYXJnc1swXSkpOwogIH0gZWxz ZSB7CiAgICBiaW5hcnkgPSByZWFkKGFyZ3NbMF0sICdiaW5hcnknKTsKICB9Cn0KdmFyIGluc3Rh 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