99310 2012-10-15 05:15:51 -0700 [JSC] Indexeddb unable to deserialize the string record 2013-03-25 23:42:25 -0700 1 1 1 Unclassified WebKit WebKit Misc. 528+ (Nightly build) Unspecified Unspecified RESOLVED INVALID P2 Major --- 1 charles.wei charles.wei alecflett joenotcharles jsbell michael oliver rwlbuis staikos tonikitoo yong.li.webkit oldest_to_newest 741959 0 charles.wei 2012-10-15 05:15:51 -0700 The indexeddb for jsc binding failed to work (tested with BlackBerry porting), with the log: Type error: unable to deserialize data. 741960 1 168683 charles.wei 2012-10-15 05:16:35 -0700 Created attachment 168683 indexeddb test case 741982 2 168694 charles.wei 2012-10-15 05:59:34 -0700 Created attachment 168694 Patch 742013 3 168694 rwlbuis 2012-10-15 06:47:33 -0700 Comment on attachment 168694 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=168694&action=review I think someone with more knowledge about IndexDB should review. > Source/WebCore/ChangeLog:3 > + Indexeddb doesn't wrong with the attached test case and "Unable to deserialize data" Title seems odd? 742025 4 charles.wei 2012-10-15 07:07:17 -0700 (In reply to comment #3) > (From update of attachment 168694 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=168694&action=review > > I think someone with more knowledge about IndexDB should review. > > > Source/WebCore/ChangeLog:3 > > + Indexeddb doesn't wrong with the attached test case and "Unable to deserialize data" > > Title seems odd? Sorry, that comes from the wrong title of the bug,which has been fixed. Will resubmit the patch with the correct title by s/wrong/work 742195 5 168694 jsbell 2012-10-15 11:08:26 -0700 Comment on attachment 168694 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=168694&action=review > Source/WebCore/ChangeLog:15 > + The test case is attached at: https://bugs.webkit.org/show_bug.cgi?id=99310 Please convert the test case to a LayoutTest in storage/indexeddb so regressions will be caught automatically when JSC ports enable IDB. > Source/WebCore/bindings/js/SerializedScriptValue.cpp:1008 > + // If the value contains odd number of content, append UndefinedTag at the end Just to clarify what's going on: "content" => "bytes" > Source/WebCore/bindings/js/SerializedScriptValue.cpp:1010 > + // String is UChar (2 types) internal and takes even number of value. "types" => "bytes" "value" => "bytes" > Source/WebCore/bindings/js/SerializedScriptValue.cpp:1012 > + writeLittleEndian<uint8_t>(const_cast<Vector<uint8_t>& >(value), UndefinedTag); This is violating the "const" constraint and modifying the vector that is passed in, which is bad. Can you find another way to do this? I haven't traced through to see if adding an extra UndefinedTag at the end of the data is safe; the JSC toWireString(Vector<char>)/create(String) code is much more complicated than it seems like it needs to be, so there's stuff going on I'm not familiar with. Why doesn't this issue affect non-IDB use of SerializedScriptValue? 765212 6 168694 charles.wei 2012-11-12 21:41:56 -0800 Comment on attachment 168694 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=168694&action=review >> Source/WebCore/ChangeLog:15 >> + The test case is attached at: https://bugs.webkit.org/show_bug.cgi?id=99310 > > Please convert the test case to a LayoutTest in storage/indexeddb so regressions will be caught automatically when JSC ports enable IDB. Actually the existing test cases cover this case. This happens when IndexedDB.put('string', 'key'); The following existing test cases fail without the patch and succeed with the fix. LayoutTests/storage/indexeddb/cursor_delete.html LayoutTests/storage/indexeddb/cursor_inconsistency.html LayoutTests/storage/indexeddb/cursor_prev_no_duplicate.html because the internal of the SerializedScriptValue for String is: <version,2 bytes> <StringTag, 1 byte> <Length 2 bytes> <UChar 2*n bytes> That is an odd bytes. While when persist the value, we call String SerializedScriptValue::toWireString() to make it a String for persistence. if we don't pad with one byte, we lose the last byte of the SerializedScriptValue and can't convert it back with SerializedScriptValue::createFromWire() and SerializedScriptValue::deserialize(). >> Source/WebCore/bindings/js/SerializedScriptValue.cpp:1008 >> + // If the value contains odd number of content, append UndefinedTag at the end > > Just to clarify what's going on: > > "content" => "bytes" ok. >> Source/WebCore/bindings/js/SerializedScriptValue.cpp:1010 >> + // String is UChar (2 types) internal and takes even number of value. > > "types" => "bytes" > "value" => "bytes" Ok. >> Source/WebCore/bindings/js/SerializedScriptValue.cpp:1012 >> + writeLittleEndian<uint8_t>(const_cast<Vector<uint8_t>& >(value), UndefinedTag); > > This is violating the "const" constraint and modifying the vector that is passed in, which is bad. > > Can you find another way to do this? > > I haven't traced through to see if adding an extra UndefinedTag at the end of the data is safe; the JSC toWireString(Vector<char>)/create(String) code is much more complicated than it seems like it needs to be, so there's stuff going on I'm not familiar with. > > Why doesn't this issue affect non-IDB use of SerializedScriptValue? There's no other better way to cast away the const, another way is to remove the const from the argument. why doesn't this issue affect non-IDB use ? Because there's no others are using this except IDB. toWireString and createFromWire are inside INDEXEDDB macro. 765248 7 173823 charles.wei 2012-11-12 22:19:08 -0800 Created attachment 173823 Patch 765561 8 173823 yong.li.webkit 2012-11-13 07:10:55 -0800 Comment on attachment 173823 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=173823&action=review > Source/WebCore/bindings/js/SerializedScriptValue.cpp:1011 > + if (value.size() % sizeof(UChar)) I remember Darin told me before UChar could be 4 bytes? 765565 9 173823 yong.li.webkit 2012-11-13 07:14:10 -0800 Comment on attachment 173823 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=173823&action=review > Source/WebCore/bindings/js/SerializedScriptValue.cpp:1012 > + writeLittleEndian<uint8_t>(const_cast<Vector<uint8_t>& >(value), NullTag); I don't like this const_cast, nor the unneeded null in String. Why don't we change "length" instead? 765585 10 173823 yong.li.webkit 2012-11-13 07:38:54 -0800 Comment on attachment 173823 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=173823&action=review >> Source/WebCore/bindings/js/SerializedScriptValue.cpp:1012 >> + writeLittleEndian<uint8_t>(const_cast<Vector<uint8_t>& >(value), NullTag); > > I don't like this const_cast, nor the unneeded null in String. Why don't we change "length" instead? I was wrong about "length". But still, don't like the const_cast here. 765628 11 173823 charles.wei 2012-11-13 08:24:18 -0800 Comment on attachment 173823 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=173823&action=review >> Source/WebCore/bindings/js/SerializedScriptValue.cpp:1011 >> + if (value.size() % sizeof(UChar)) > > I remember Darin told me before UChar could be 4 bytes? In what scenario that Uchar is 4 bytes? >>> Source/WebCore/bindings/js/SerializedScriptValue.cpp:1012 >>> + writeLittleEndian<uint8_t>(const_cast<Vector<uint8_t>& >(value), NullTag); >> >> I don't like this const_cast, nor the unneeded null in String. Why don't we change "length" instead? > > I was wrong about "length". But still, don't like the const_cast here. Just changing the length will leave an arbitrary byte at the end which might be interpreted differently. we intentionally put a NullTag at the end to make it even bytes, otherwise we will lose one bytes. The padding NullTag won't be interpreted to anything meaningful. I also don't like the const_cast,but if we don't use it, we have to make a copy of the data and operate on the copy which is an even worse solution I think. We have to use if if we have no other better solutions. Or what do you suggest, yong? 765659 12 jsbell 2012-11-13 08:55:40 -0800 Note that webkit.org/b/45110 has a fix for the same problem and doesn't do a const_cast - it does a data copy. While that's unfortunate I don't think a const_cast is acceptable because it breaks the API contract and could affect unrelated functions. Either doing a copy or changing the function signature is a better approach. 765666 13 yong.li.webkit 2012-11-13 09:01:30 -0800 (In reply to comment #12) > Note that webkit.org/b/45110 has a fix for the same problem and doesn't do a const_cast - it does a data copy. While that's unfortunate I don't think a const_cast is acceptable because it breaks the API contract and could affect unrelated functions. Either doing a copy or changing the function signature is a better approach. Or CloneDeserializer::readString(start, end, str, length - 1), and then make up an 1-char buffer for the last char? Also I'm not sure adding NullTag is safe. Charles, could we just ignore the last char? Or use "?" 766324 14 174052 charles.wei 2012-11-13 19:30:40 -0800 Created attachment 174052 Patch 766326 15 charles.wei 2012-11-13 19:32:11 -0800 (In reply to comment #12) > Note that webkit.org/b/45110 has a fix for the same problem and doesn't do a const_cast - it does a data copy. While that's unfortunate I don't think a const_cast is acceptable because it breaks the API contract and could affect unrelated functions. Either doing a copy or changing the function signature is a better approach. Ok, the new patch just does a copy and operates on the copy instead of the original data, even though I don't like this solution. 766328 16 charles.wei 2012-11-13 19:33:35 -0800 (In reply to comment #13) > (In reply to comment #12) > > Note that webkit.org/b/45110 has a fix for the same problem and doesn't do a const_cast - it does a data copy. While that's unfortunate I don't think a const_cast is acceptable because it breaks the API contract and could affect unrelated functions. Either doing a copy or changing the function signature is a better approach. > > Or CloneDeserializer::readString(start, end, str, length - 1), and then make up an 1-char buffer for the last char? > > Also I'm not sure adding NullTag is safe. Charles, could we just ignore the last char? Or use "?" Adding NullTag is safer than anything else, I think. we can't just ignore the last char, otherwise, it will be an arbitrary byte and unpredictable. 766978 17 oliver 2012-11-14 09:43:44 -0800 Let me have a look at this, I need to work out what's going on, and the serialization code shouldn't be having any IDB specific issues. For reference can you tell me what architecture and byte order blackberry uses? Also UChar are only 2 bytes, a character may be four bytes (two UChar's), this is one of those great character vs. code point things. We also like to try and store strings using a byte characters where possible. Oh, and all changes to serialization should bump the version number. 766983 18 jsbell 2012-11-14 09:49:20 -0800 SerializedScriptValue serializes to a Vector<char> - an opaque binary blob - then tries to store that result in a String (in toWireString). If the length of the Vector<char> is odd the data is truncated by one byte. Nothing to do with code points vs. characters. It's purely about storing an opaque blob of binary data in a String and an issue with odd lengths. There's nothing IDB specific about this, but perhaps IDB is the only thing exercising the toWireString() method. 766986 19 jsbell 2012-11-14 09:54:19 -0800 (In reply to comment #18) > Nothing to do with code points vs. characters. (er, code units vs. code points; sorry, caffeine is still kicking in.) 767000 20 oliver 2012-11-14 10:09:47 -0800 (In reply to comment #19) > (In reply to comment #18) > > Nothing to do with code points vs. characters. > > (er, code units vs. code points; sorry, caffeine is still kicking in.) I was responding to the "UChar could be four bytes" comment. Bigger question: wtf is idb using Strings as its storage format? It's storing a binary blob, not a string. 767014 21 jsbell 2012-11-14 10:20:46 -0800 (In reply to comment #20) > Bigger question: wtf is idb using Strings as its storage format? It's storing a binary blob, not a string. Now that's a good question... the code around that hasn't been touched in the time I've been working on IDB. It doesn't look like there's a good reason; it's just being used as a length + bytes mechanism for serialization. Would be easy to change, apart from back-compat (we still need to be able to read old data that's already on disk). From an IDB perspective it would make sense to remove the toWireString/createFromWire(String) methods in favor of producing/consuming Vector<char>. 767386 22 jsbell 2012-11-14 15:42:48 -0800 *** Bug 102293 has been marked as a duplicate of this bug. *** 767569 23 charles.wei 2012-11-14 18:30:45 -0800 (In reply to comment #21) > (In reply to comment #20) > > Bigger question: wtf is idb using Strings as its storage format? It's storing a binary blob, not a string. > > Now that's a good question... the code around that hasn't been touched in the time I've been working on IDB. It doesn't look like there's a good reason; it's just being used as a length + bytes mechanism for serialization. Would be easy to change, apart from back-compat (we still need to be able to read old data that's already on disk). > > From an IDB perspective it would make sense to remove the toWireString/createFromWire(String) methods in favor of producing/consuming Vector<char>. yes, agree. toWireString actually goes to a String and createFromWire's input is String, that's what it is now , for both JSC and V8 bindings, even though I don't think it's reasonable and what's the background of that design. What this patch is about is to make it work with this mechanism, refactor of this is out of the scope of this patch. 771487 24 staikos 2012-11-19 21:43:06 -0800 (In reply to comment #23) > (In reply to comment #21) > > (In reply to comment #20) > > > Bigger question: wtf is idb using Strings as its storage format? It's storing a binary blob, not a string. > > > > Now that's a good question... the code around that hasn't been touched in the time I've been working on IDB. It doesn't look like there's a good reason; it's just being used as a length + bytes mechanism for serialization. Would be easy to change, apart from back-compat (we still need to be able to read old data that's already on disk). > > > > From an IDB perspective it would make sense to remove the toWireString/createFromWire(String) methods in favor of producing/consuming Vector<char>. > > yes, agree. toWireString actually goes to a String and createFromWire's input is String, that's what it is now , for both JSC and V8 bindings, even though I don't think it's reasonable and what's the background of that design. What this patch is about is to make it work with this mechanism, refactor of this is out of the scope of this patch. I think Charles is right. This patch looks like it fixes the bug, but we all seem to agree that it should move away from String at some point. Any objections? 771502 25 charles.wei 2012-11-19 22:02:54 -0800 Just ran the test on Mac , with and without this patch. The result shows that with the patch, no regressions found, instead, some failed test cases succeeded now. details: Tests that failed text/pixel/audio diff (13) : same as without the patch. Tests that had stderr output (1): It was 8 without the patch. Flaky tests (failed the first run and passed on retry) (13): it was 17 without the patch. Tests expected to fail but passed (5): same as without the patch. 855937 26 joenotcharles 2013-03-15 06:19:50 -0700 (In reply to comment #24) > I think Charles is right. This patch looks like it fixes the bug, but we all seem to agree that it should move away from String at some point. Any objections? Seems to me that if this fixes the bug it should be committed ASAP and we should file a followup bug to convert away from String. 856063 27 michael 2013-03-15 10:04:42 -0700 (In reply to comment #26) > Seems to me that if this fixes the bug it should be committed ASAP and we should file a followup bug to convert away from String. As of the changes made in bug 104354, IndexedDB serialization no longer uses strings. This bug is no longer relevant and should be closed. 863404 28 charles.wei 2013-03-25 23:40:55 -0700 This patch doesn't seem to apply anymore with the change upstream. 168683 2012-10-15 05:16:35 -0700 2012-10-15 05:16:35 -0700 indexeddb test case test.html text/html 15939 charles.wei PCFET0NUWVBFIGh0bWw+CjxodG1sPgogICAgPGhlYWQ+CiAgICAgICAgPHRpdGxlPkluZGV4REIg RGVtbyAtIFZlcnNpb24gMS4xPC90aXRsZT4KICAgICAgICA8bWV0YSBodHRwLWVxdWl2PSJDb250 ZW50LVR5cGUiIGNvbnRlbnQ9InRleHQvaHRtbDsgY2hhcnNldD1VVEYtOCIvPgogICAgICAgIDxt ZXRhIG5hbWU9ImF1dGhvciIgY29udGVudD0iSWRvIEdyZWVuIi8+CiAgICA8L2hlYWQ+CiAgICA8 c3R5bGU+CiAgICAgICAgI2Zvb3RlciB7CiAgICAgICAgICAgIGJhY2tncm91bmQtY29sb3I6IHll bGxvd2dyZWVuOwogICAgICAgICAgICBwYWRkaW5nOiA4cHg7CiAgICAgICAgICAgIG1hcmdpbjog NnB4OwogICAgICAgICAgICAtbW96LWJvcmRlci1yYWRpdXM6IDE1cHg7CiAgICAgICAgICAgIC13 ZWJraXQtYm9yZGVyLXJhZGl1czogMTVweDsKICAgICAgICB9CiAgICAgICAgI2Zvb3RlciBwIHsK ICAgICAgICAgICAgZm9udC1zaXplOiA5MCU7CiAgICAgICAgICAgIGZvbnQtc3R5bGU6IGl0YWxp 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-0800 2013-03-25 23:42:25 -0700 Patch bug-99310-20121114112838.patch text/plain 3002 charles.wei U3VidmVyc2lvbiBSZXZpc2lvbjogMTM0NTIxCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNzE1NTQ1MzNmMTEzOWIz NWJkYWFhZDIzMGE1YzljNTZmYWFiMzBjMS4uMDY1ZmYzZmEzZTA4ZTIwMzkyNzllMzczYWI3MzJh NzY0ZWYzOGQwZSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI3IEBACisyMDEyLTExLTEzICBDaGFy bGVzIFdlaSAgPGNoYXJsZXMud2VpQHRvcmNobW9iaWxlLmNvbS5jbj4KKworICAgICAgICBKU0Mg YmluZGluZyBvZiBJbmRleGVkZGIgZmFpbHMgdG8gcHV0IGEgc3RyaW5nIHR5cGUgcmVjb3JkLgor ICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9OTkzMTAKKwor ICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBXaXRoIEpTQyBi aW5kaW5nIG9mIFNlcmlhbGl6ZWRTY3JpcHRWYWx1ZSwgdG9XaXJlU3RyaW5nKFZlY3Rvcjx1bnNp Z25lZCBjaGFyPiYgdmFsdWUpCisgICAgICAgIHRyaWVzIHRvIGNvbnZlcnQgYSBTZXJpYWxpemVk 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