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  1. Commons BCEL
  2. BCEL-307

ClassFormatException thrown in Pass 3A verification

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 6.2
    • Fix Version/s: None
    • Component/s: Verifier
    • Labels:
      None

      Description

      The verifier throws a ClassFormatException during Pass 3A verification of a malformed class file even though Pass 1 and Pass 2 have completed successfully.

      Note that the input class file is indeed malformed, however the verifier should ideally just return a verification result of REJECTED instead of throwing an unchecked run-time exception.

      Steps to reproduce:

       

      Save the attached file as "example/A.class" and run:

      java -cp <classpath> org.apache.bcel.verifier.Verifier example.A

       

      The file A.class was generated automatically by the fuzzer JQF (https://github.com/rohanpadhye/jqf).

      Expected output:

      VERIFIED_REJECTED

      Observed output:

      JustIce by Enver Haase, (C) 2001-2002.

      <http://bcel.sourceforge.net>

      <http://commons.apache.org/bcel>

       

      Now verifying: example.A

       

      Pass 1:

      VERIFIED_OK

      Passed verification.

       

      Pass 2:

      VERIFIED_OK

      Passed verification.

       

      Exception in thread "main" org.apache.bcel.classfile.ClassFormatException: Expected class `CONSTANT_InvokeDynamic' at index 14 and got CONSTANT_Methodref[10](class_index = 13, name_and_type_index = 11)

      at org.apache.bcel.classfile.ConstantPool.getConstant(ConstantPool.java:261)

      at org.apache.bcel.classfile.ConstantPool.constantToString(ConstantPool.java:207)

      at org.apache.bcel.classfile.Utility.codeToString(Utility.java:373)

      at org.apache.bcel.classfile.Utility.codeToString(Utility.java:157)

      at org.apache.bcel.classfile.Code.toString(Code.java:306)

      at org.apache.bcel.classfile.Code.toString(Code.java:328)

      at java.lang.String.valueOf(String.java:2994)

      at java.lang.StringBuilder.append(StringBuilder.java:131)

      at org.apache.bcel.verifier.statics.Pass3aVerifier.delayedPass2Checks(Pass3aVerifier.java:289)

      at org.apache.bcel.verifier.statics.Pass3aVerifier.do_verify(Pass3aVerifier.java:200)

      at org.apache.bcel.verifier.PassVerifier.verify(PassVerifier.java:71)

      at org.apache.bcel.verifier.Verifier.doPass3a(Verifier.java:89)

      at org.apache.bcel.verifier.Verifier.main(Verifier.java:216)

       

        Attachments

        1. A.class
          0.4 kB
          Rohan Padhye

          Activity

            People

            • Assignee:
              Unassigned
              Reporter:
              rohanpadhye Rohan Padhye
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              Dates

              • Created:
                Updated: