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Sunday Oct 30, 2005

Typechecking JVML

In Java 6 (Mustang) we will be releasing a new version of the byte code verifier. For those of you living in blessed ignorance, the verifier is in essence a typechecker for machine language of the JVM, which I will refer to as JVML below.  

So why are we doing this? To make verification faster, simpler and more adaptable. The existing verifier performs type inference (more precisely,  type reconstruction). In JVML, types are declared for fields, formal parameters of methods and method return types - but not for local variables or the operand stack.  Hence, the verifier must infer the types of local variables and the operand stack based on how they are used. This is slow, memory intensive and very complicated.

The new scheme is rooted in research done by Eva Rose for her master's thesis a few years back.

The new verifier requires additional type declarations for local variables and the operand stack in JVML. As a consequence of this and other detailed changes, it doesn't need to infer them, and is about twice as fast, uses a fraction of the memory and is vastly simpler than the old verifier.

So increased speed and reduced space are obviously good. Simplicity is also obviously good, but looking at the software industry, it's clear that it worships complexity. An appreciation of simplicity for its own sake is sorely lacking. Most people need very concrete examples before they are willing to invest any effort for the sake of simplicity.

Here is one example of why this simplification might be useful. Let's imagine that at some point in time, it might be plausible (in terms of compatibility) to reify generics. Among many other issues, this entails verification of generics. It will be relatively straightforward to extend the new verifier to typecheck generics. Anyone who would seek to get the old verifier to do this is probably in need of clinical assistance.

In Mustang, javac will generate the necessary type information in the class files it produces. It won't generate code using jsr and ret either (nor will other tools Sun releases). Other vendors may need more time to catch up, which is why we will fall back to the old verifier for a while.

The spec for all this is being worked out as part of JSR202 where you can get a draft spec. You can also get more detail on practicalities in  Wei Tao's article on the typechecking verifier. Obviously, the verifier is critical to the security and integrity ofthe Java platform. Because of this, we'd like to get the community involved in banging on both the spec and the implementation. If there are any holes, we want to find them before the release.

To that end, Sun is asking for knowledgable people to have a go at cracking the new verification scheme. If you find a hole in the spec, you'll get recognized at the JavaOne 2006 conference. Honorable mention for finding holes in the implementation. Details should be available soon at the  Crack the Verifier Initiative   web page.

Posted at 06:00PM Oct 30, 2005 by gbracha in Java  |  Comments[62]

Comments:

Hmm. On reading your block and Wei's article, it seems that the verifier will only apply to classes built with Mustang--so what happens when I deploy an application with pre-Mustang jars? Does it automatically fall back to the old verifier if the classfile format is not 50.0? Also seems that "faster" is then misleading, as it will only be "faster" for Mustang-generated class files. It seems welcome, but impact will probably be slow to take hold. Cheers! Patrick

Posted by Patrick Wright on October 31, 2005 at 05:06 AM PST #

Not misleading at all. The post says quite clearly that javac will generate the necessary type information, so of course it makes sense that only those classes compiled with mustang's javac would run faster: <p/> <strong> In Mustang, javac will generate the necessary type information in the class files it produces. It won't generate code using jsr and ret either (nor will other tools Sun releases). Other vendors may need more time to catch up, which is why we will fall back to the old verifier for a while. </strong>

Posted by Dana on October 31, 2005 at 06:27 AM PST #

Patrick, That was answered in the weblog post. Mustang falls back to using the old class verifier if not compiled from Java 6.

Posted by Fred Grott on October 31, 2005 at 06:29 AM PST #

How does the new verifier detect intentially misleading/corrupted types in the class file?

Posted by Udo Schuermann on October 31, 2005 at 06:43 AM PST #

As it is quite clear from the article that the performance gain will only be noticeable in classes compiled under Mustang, my question is: Do the JVM libraries get verified? If so then this will still provide a substantial speed boost for project run with Mustang, even if it wasn't compiled with it, as the usage of Mustang-compiled JDK libraries will be sped up substantially.

Posted by Tal Rotbart on October 31, 2005 at 06:45 AM PST #

What about opcode validation , memory references ...wouldn't it be possible as it is with older jvm version to forge illegal "opcodes" sequences to trigger bug in the sandbox to enable evil class to execute code outside the jvm , hence with the priviledges of the jvm on the host operating system. Is that initiative will prevent futur attack on the opcode interpretation?

Posted by Eric Lauzon on October 31, 2005 at 11:13 AM PST #

What about opcode validation , memory references ...wouldn't it be possible as it is with older jvm version to forge illegal "opcodes" sequences to trigger bug in the sandbox to enable evil class to execute code outside the jvm , hence with the priviledges of the jvm on the host operating system. Is that initiative will prevent futur attack on the opcode interpretation?

Posted by Eric Lauzon on October 31, 2005 at 11:13 AM PST #

Sorry for the duplicate comment.

Posted by Eric Lauzon on October 31, 2005 at 12:32 PM PST #

Why bother with the StackMap info at all? If we restrict bytecode generators to leave nothing on the top of the stack at the beginning of basic blocks (except for exception handlers), then no addditional information needs to be added to the .class file. Xavier Leroy has done the necessary work needed to convert existing .class files into those without messy stacks.

Posted by Joel Jones on November 01, 2005 at 01:48 PM PST #

How does this differ from the existing CLDC verifier? Or are Sun not confident that the CLDC verifier is bug-free?

Posted by Peter Taylor on November 02, 2005 at 08:40 AM PST #

There are some pretty significant differences between CLDC and the new verifier. The issue of class loaders does not come up in CLDC, and induces systemic changes to the verifier specification, which are very relevant to security. Also, the StackMap format used is different - it's significantly more space efficient. As for Xavier's Leroy's work - very nice stuff, we are familiar with it. However, we chose not to go that route.

Posted by Gilad Bracha on November 02, 2005 at 10:05 AM PST #

OK, I'm trying to compile Java6 so that I can experiment with the bytecode type verifier. I've got to the point where it complaints that "Missing ./../src/share/lib/fonts/LucidaTypewriterRegular.ttf". I have downloaded http://www.java.net/download/jdk6/jdk-6-beta-src-b59-jrl-03_nov_2005.jar and http://www.java.net/download/jdk6/jdk-6-beta-mozilla_headers-b59-unix-03_nov_2005.jar. Is there something else that needs to be downloaded?

Posted by Radu Grigore on November 10, 2005 at 09:26 AM PST #

The easiest way to solve that is to find that particular file from the binary distribution and copy it to the particular directory and try again.

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Posted by d r on November 19, 2005 at 01:14 PM PST #

To spot any flaw in the verifier would require in-depth consideration of the changes to the existing verifier; in-effect one would have to understand the spec. of the new verifier EXACTLY. It would require considerable resources to a) identify the test cases b) to execute them. Also, the low-level nature of the verifier would require heavy duty know-how. I shudder at the thought of anyone wanting to do that, except Sun Micro. as they would have all the existing test harnesses setup for the existing verifiers not to mention the resources. All the best to those attempting it :=) as we all need a verifier that is as bullet-proof as possible.

Posted by kambiz shahri on November 21, 2005 at 03:13 PM PST #

Test

Posted by 62.38.141.229 on December 01, 2005 at 03:35 AM PST #

How do you verify that a malicious user creates a custom class, where the verifier information does not actually correspond to the information within the class. In that if the verification information presents the states that are legal within the sandbox, but the instructions themselves have an illegal injection. Would you not have to in this case to restrict all illegal OS level accessors under the sandbox anyway? And if the VM is running in a sandbox mode would just restricting access to the specific OS functions achieve the same result? From the spec I could not find, yet, weather, legality of the class is sole based upon the information within the verifier?

Posted by Mike M on December 17, 2005 at 11:39 AM PST #

Better to just get rid of the verifier altogether, it is obsolete technology.

Create a compiled JAR cache which contains shared library lightly compiled versions of JARS. When Java sees a new JAR it looks in the cache first to see if it has already been verified, checking timestamps. If found, it can just be memory mapped in, very fast. And, more importantly it can be shared.

"Lightly compiled" means not inlining that could be invalidated by other JARS. Still much faster than byte code.

This would obviate the need for the monolithic Java process.

Once you cache byte coding, then you don't need the javac/byte code at all. Just load source directly into java. Much simpler build environment.

Posted by Anthony Berglas on December 18, 2005 at 04:36 PM PST #

Greetings to all.

Some time ago, Java bytecode verification was one of my research interests and I am still interested in the issue.

I can still remember some oddities and will check what Mustang intends to do with them. Inlining the subroutines has at least removed the biggest question mark already ;-)

If I got it right, this is currently the only discussion list (the link in the forums section does not seem to be ready). Hence, let me post some first comments.

The specification request has become more "specific" with respect to the semantics of the type checking rules - thanks for that. The only thing I want to suggest, is to place a more detailed view on the type hierarchy somewhere. This should include the first layer of array types (with reference and primitive type elements) - to help the newcomers understand the consequences of the inductive definition and the special role of type <tt>object</tt>.

Finally, can anybody give me a short intention about the algorithm? Is it mainly the CLDC style verification enhanced by a more sophisticated encoding or have you adopted any of Eva Rose's advanced ideas like integration of type information that has been constructed by the verifier and the minimization of the active stack map attributes during the verification process?

Best regards

Posted by KarstenKlohs on December 23, 2005 at 12:45 AM PST #

Hi I think you can use some public key algorithms which are generally used for security purposes. RSA is one such kind of algorithm which is used in secureIDs also. The similar type of algorithms can be implemented here to verify the byte code as well. Regards Amit Kumar

Posted by Amit Kumar on December 28, 2005 at 04:27 AM PST #

Are formal methods being used on the verifier? Seems like an idea worth checking out.

Posted by David Hoyt on January 11, 2006 at 02:48 PM PST #

I've tried to read the ammended text of the verifier, but I found it too hard to read. If you're not into virtual machines already, I really would advise you all to skip trying to verify any of it. I see a lot of replies here that mean well, but ar so far off-topic that they are virtually useless. As for Amit, RSA has absolutely nothing to do with code verification. It is already used for code signing .jar files. It establishes that a (trusted) entity has created the code and may be used to add permissions to applets and applications. This (the new verifier) is about verifying if the code itself behaves like it should. EG Active X code may be signed, but the code itself may still create a buffer overrun somewhere. Java VM code cannot do that because of the verifier.

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I am curious, how did this turn out for you? Did you get useful submissions? cheers, dalibor topic

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