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  1. Commons BCEL
  2. BCEL-303

AssertionViolatedException in Pass 3A Verification of invoke instructions

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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 an assertion violation / INTERNAL ERROR in pass 3A when verifying a malformed class file.

      As I understand it, the issue is that if class A implements interface B, then class A can be pass stage 1 verification even if class B is not resolved. However, pass 3A verification of code that invokes a method defined on class A assumes that the receiver type and all its interfaces are fully resolved.

      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.verifier.exc.AssertionViolatedException: INTERNAL ERROR: Missing class: java.lang.ClassNotFoundException: Exception while looking for class example.I0: java.io.IOException: Couldn't find: example/I0.class

      at org.apache.bcel.verifier.statics.Pass3aVerifier$InstOperandConstraintVisitor.visitINVOKEVIRTUAL(Pass3aVerifier.java:1315)

      at org.apache.bcel.generic.INVOKEVIRTUAL.accept(INVOKEVIRTUAL.java:89)

      at org.apache.bcel.generic.InstructionHandle.accept(InstructionHandle.java:302)

      at org.apache.bcel.verifier.statics.Pass3aVerifier.pass3StaticInstructionOperandsChecks(Pass3aVerifier.java:443)

      at org.apache.bcel.verifier.statics.Pass3aVerifier.do_verify(Pass3aVerifier.java:208)

      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)

      Caused by: java.lang.ClassNotFoundException: Exception while looking for class example.I0: java.io.IOException: Couldn't find: example/I0.class

      at org.apache.bcel.util.MemorySensitiveClassPathRepository.loadClass(MemorySensitiveClassPathRepository.java:97)

      at org.apache.bcel.classfile.JavaClass.getInterfaces(JavaClass.java:847)

      at org.apache.bcel.verifier.statics.Pass3aVerifier$InstOperandConstraintVisitor.getMethodRecursive(Pass3aVerifier.java:1181)

      at org.apache.bcel.verifier.statics.Pass3aVerifier$InstOperandConstraintVisitor.visitINVOKEVIRTUAL(Pass3aVerifier.java:1304)

      ... 7 more

      Caused by: java.io.IOException: Couldn't find: example/I0.class

      at org.apache.bcel.util.ClassPath.getClassFile(ClassPath.java:279)

      at org.apache.bcel.util.ClassPath.getInputStream(ClassPath.java:209)

      at org.apache.bcel.util.ClassPath.getInputStream(ClassPath.java:188)

      at org.apache.bcel.util.MemorySensitiveClassPathRepository.loadClass(MemorySensitiveClassPathRepository.java:95)

      ... 10 more

       

       

        Attachments

        1. A.class
          0.3 kB
          Rohan Padhye

          Activity

            People

            • Assignee:
              Unassigned
              Reporter:
              rohanpadhye Rohan Padhye
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              Dates

              • Created:
                Updated: