RFR: 8330936: [ubsan] exclude function BilinearInterp and ShapeSINextSpan in libawt java2d from ubsan checks

[Matthias Baesken]

On Fri, 31 Jan 2025 01:02:34 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> In java2d coding there are a few overflows (those are shown when running jtreg tests with ubsan enabled binaries) 
>> jtreg test java/awt/Scrollbar/AquaLFScrollbarTest/ScrollBarBorderTest.java shows
>> 
>> jdk/src/java.desktop/share/native/libawt/java2d/loops/TransformHelper.c:683:16: runtime error: signed integer overflow: 1651910497 + 660764199 cannot be represented in type 'int'
>>     #0 0x7efe59e6ece8 in BilinearInterp src/java.desktop/share/native/libawt/java2d/loops/TransformHelper.c:683
>>     #1 0x7efe59e75e21 in Java_sun_java2d_loops_TransformHelper_Transform src/java.desktop/share/native/libawt/java2d/loops/TransformHelper.c:499
>>     #2 0x7efe9b8dee7b (<unknown module>)
>> 
>> java/awt/BasicStroke/DashStrokeTest.java shows
>> 
>> src/java.desktop/share/native/libawt/java2d/pipe/ShapeSpanIterator.c:1366:21: runtime error: signed integer overflow: 128253951 + 2118518271 cannot be represented in type 'int'
>>     #0 0x7fb97d7daf21 in ShapeSINextSpan src/java.desktop/share/native/libawt/java2d/pipe/ShapeSpanIterator.c:1366
>>     #1 0x7fb97d62fa7e in AnyIntSetSpans src/java.desktop/share/native/libawt/java2d/loops/AnyInt.c:75
>>     #2 0x7fb97d6a8816 in Java_sun_java2d_loops_FillSpans_FillSpans src/java.desktop/share/native/libawt/java2d/loops/FillSpans.c:92
>>     #3 0x7fba12d07e7b (<unknown module>)
>> 
>> 
>> There is currently no need seen to adjust this coding, so exclude the methods from ubsan checking to avoid unneeded warnings.
>
> how it is possible to repro these warnings?

Hi @mrserb any comments? Are you fine with the change ?

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PR Comment: https://git.openjdk.org/jdk/pull/23255#issuecomment-2684864114