RFR(M) 8212605: Pure-Java implementation of AccessController.doPrivileged

dean.long at oracle.com dean.long at oracle.com
Thu Nov 1 17:15:30 UTC 2018


Hi Peter.  Thanks for the input.  I don't know about DomainCombiner, but 
perhaps someone else on this list does.

dl

On 10/31/18 6:15 PM, Peter wrote:
> Hello Dean & David,
>
> Interesting reading.   Is DomainCombiner still being considered for 
> deprecation?
>
> Our code makes heavy use of AccessController.doPrivileged.
>
> Regards,
>
> Peter.
>
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>
> On 1/11/2018 10:54 AM, David Holmes wrote:
>> Hi Dean,
>>
>> On 1/11/2018 10:13 AM, dean.long at oracle.com wrote:
>>> On 10/31/18 4:06 PM, David Holmes wrote:
>>>> Hi Dean,
>>>>
>>>> Looking only at the hotspot changes. The removal of the 
>>>> DoPrivileged and related privileged_stack code seems okay. I have a 
>>>> few related comments:
>>>>
>>>> src/hotspot/share/classfile/systemDictionary.hpp
>>>>
>>>> You added the java_security_AccessController class after 
>>>> java_security_AccessControlContext. Did you actually verify where 
>>>> in the load/initialization order the AccessController class appears 
>>>> today, and where it appears after your change? (Note the comments 
>>>> at the start of WK_KLASSES_DO). Changes to the initialization order 
>>>> would be my biggest concern with this patch.
>>>>
>>>
>>> No, I did not notice that comment and assumed alphabetical order was 
>>> OK here.  However, these classes appear to be only resolved, not 
>>> initialized (and AccessController does not have a static 
>>> initializer), so could you explain how the order in this list can 
>>> affect initialization order?
>>
>> You're right it doesn't. There are a couple of comments that refer to 
>> "initialization" but it's not static initialization of these classes.
>>
>> I'm unclear how the resolution order in that list may interact with 
>> other parts of the startup sequence.
>>
>>> I only need this in JVM_GetStackAccessControlContext, which is a 
>>> static JNI method, so I could get the klass* from the incoming 
>>> jclass instead of using a well-known class entry.
>>
>> I think it's okay given we have AccessControlContext there anyway.
>>
>>>> ---
>>>>
>>>> I'm unclear about the change to the test:
>>>>
>>>> test/hotspot/jtreg/runtime/JVMDoPrivileged/DoPrivRunAbstract.jasm
>>>>
>>>> as it still refers to the now non-existent JVM_DoPrivileged in the 
>>>> summary. Does this test still make sense? Should it be moved to the 
>>>> Java side now it doesn't actually test anything in the VM?
>>>>
>>>
>>> I think these tests still make sense, unless we have similar 
>>> coverage somewhere else.  How about if I fix the reference to 
>>> JVM_DoPrivileged for now and file a separate bug about moving or 
>>> removing these tests?
>>
>> Yep that's fine.
>>
>>>> ---
>>>>
>>>> There may be further dead code to remove now:
>>>>
>>>> vmSymbols.hpp: codesource_permissioncollection_signature is now 
>>>> unreferenced and can be removed.
>>>>
>>>> javaClasses.*:
>>>>   - java_lang_System::has_security_manager
>>>>   - java_security_AccessControlContext::is_authorized
>>>>
>>>> ./share/memory/universe.hpp:  static Method* 
>>>> protection_domain_implies_method()
>>>>
>>>
>>> Good catches!  I have uploaded a new webrev:
>>>
>>> http://cr.openjdk.java.net/~dlong/8212605/webrev.2/
>>> http://cr.openjdk.java.net/~dlong/8212605/webrev.2.incr/ 
>>> (incremental diff)
>>
>> Updates all look fine.
>>
>> Thanks,
>> David
>> -----
>>
>>> dl
>>>
>>>> ---
>>>>
>>>> Thanks,
>>>> David
>>>>
>>>>
>>>> On 1/11/2018 8:23 AM, dean.long at oracle.com wrote:
>>>>> https://bugs.openjdk.java.net/browse/JDK-8212605
>>>>> http://cr.openjdk.java.net/~dlong/8212605/webrev.1
>>>>>
>>>>> This change implements AccessController.doPrivileged in Java. This 
>>>>> gives a performance improvement while also being useful to Project 
>>>>> Loom by removing the Java --> native --> Java transition.  One 
>>>>> reason doPrivileged has historically been in native is because of 
>>>>> the need to guarantee the cleanup of the privileged context when 
>>>>> doPrivileged returns.  To do that in Java, the information that 
>>>>> AccessController.getContext needs is pushed onto the Java stack as 
>>>>> arguments to a method that getContext will recognize during its 
>>>>> stack walk.  This allows us to remove the native privileged stack 
>>>>> while guaranteeing that the privileged context goes away when the 
>>>>> method returns.
>>>>>
>>>>> Tested with tier1-tier3 hotspot and jdk tests and JCK 
>>>>> api/java_security tests.  For the first few rounds of testing, I 
>>>>> kept the old native privileged stack and compared the results of 
>>>>> the old and new implementations for each getContext call, which 
>>>>> did catch some early bugs.  The changes were also examined by 
>>>>> internal security experts and run through additional internal 
>>>>> security tests.
>>>>>
>>>>> The improvement on this [1] doPrivileged microbenchmark is 
>>>>> approximate 50x.
>>>>>
>>>>> There is no attempt to optimize getContext() or security 
>>>>> permission checks in this change, however, this is intended to be 
>>>>> a first step towards other possible improvements, for example 
>>>>> those proposed here [2].
>>>>>
>>>>> dl
>>>>>
>>>>> [1] 
>>>>> http://hg.openjdk.java.net/code-tools/jmh-jdk-microbenchmarks/file/fc4783360f58/src/main/java/org/openjdk/bench/java/security/DoPrivileged.java 
>>>>>
>>>>> [2] 
>>>>> http://mail.openjdk.java.net/pipermail/security-dev/2017-December/016627.html 
>>>>>
>>>>>
>>>
>



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