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From "Pavel Pervov" <pmcfi...@gmail.com>
Subject Re: [drlvm] Non-bug difference HARMONY-1688?
Date Mon, 09 Oct 2006 11:42:44 GMT
Commenting on (1) I should note, that VM generally can't determine the fact
of "initiating" class loading; it can only be done in Java (except bootstrap
class loader, of course).
AFAIK, there is the bug: DRLVM does not record initiating class loader of a
class. (1) is just the consequence.


On 10/9/06, Alexey Varlamov <alexey.v.varlamov@gmail.com> wrote:
>
> Folks,
>
> Would you mind to spend some time looking at HARMONY-1688? Good
> knowledge of classloading and security machinery is an advantage :)
>
> In short, we face 2 issues in DRLVM:
> 1) DRLVM itself is not aware of classes initiated (in contrast to
> defined ones) by a loader, and always delegates to Java classes for
> lookup (except bootstrap loader, of course). This is not really queer
> behaviour, but seems incompartible with most VMs. BTW, currently this
> affects implementation of jvmtiGetClassLoaderClasses(), which I
> believe has a bug - it returns defined classes only.
> 2) j.s.AccessController of DRLVM treats system classes (i.e. loaded by
> bootstrap loader) equally with application classes while examining
> execution stack, while RI seems to be simply skipping them. In other
> words, DRLVM would always perform ProtectionDomain.checkPermission()
> with AllPermission for bootstrap classes, and RI will omit such check
> if no user classes on stack. This potentially may produce subtle
> effects in security-exigent areas.
>
> Also, both can be considered from performance perspective, probably
> having somewhat negative impact.
> What do you think, how will we resolve this?
>
> [0] http://issues.apache.org/jira/browse/HARMONY-1688
>
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