RFR(S) 8137314: vm crash from test java/security/Policy/SignedJar/SignedJarTest.java

[Karen Kinnear]

Harold,

Change looks good. Thank you for doing this in jdk9 since it is a general issue.
And thank you both for the extensive testing and for listing it in the RFR :-)

thanks,
Karen

> On Jan 14, 2016, at 4:00 PM, harold seigel <harold.seigel at oracle.com> wrote:
> 
> Hi,
> 
> Please review this small change to fix bug 8137314 <https://bugs.openjdk.java.net/browse/JDK-8137314>
> 
> The bug is that the JVM verifier asserts when it is called recursively to verify a class that has already been linked.  There already exist checks in the verifier to prevent recursive verification of a class.  This fix adds additional checks including one needed to prevent the JVM assert.
> 
> The additional checks were added wherever there was a constant pool reference following a call that could potentially load a class. Loading a class causes the JVM to call back to the JDK to do a protection domain check which can then cause classes to get linked and executed.  And, linking changes a class's constant pool.  There are many places in the verifier that could load a class because is_assignable_from() may load a class.  But, most of them encounter an existing recursive verification check before accessing the constant pool.  These checks already exist after every verify_method() call and after every bytecode is verified.
> 
> Although the problem occurred in the Jake repo, it's being fixed in JDK-9 because the problem is not Jigsaw specific.
> 
> Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8137314/
> 
> JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8137314
> 
> The fix was tested with JCK Lang and VM tests, UTE quick and split verifier tests, and the hotspot, JDK vm, java/io, java/lang, and java/util JTreg tests, and the test case reported  in this RFR.
> 
> Thanks, Harold