<AWT Dev> RFR: 8227587: Add internal privileged System.loadLibrary

Mandy Chung mandy.chung at oracle.com
Fri Jul 12 15:25:05 UTC 2019


Thanks for exploring this.  I would like to see if we can avoid introducing
an internal @CS method (keep @CSM only for public APIs will help security

There are other alternatives to improve the footprint performance.

One idea is java.base and java.desktop each has its own utility method
to load library.  No change is needed for java.net since only one 

Another idea is to add BootLoader.loadLibrary that skips the security
permission overhead and only for boot loader use.  It would require

I think java.base and java.desktop having its own utility method is
a simpler solution.


On 7/12/19 7:55 AM, Claes Redestad wrote:
> Hi,
> I'm dropping the java.desktop changes, and Mandy has asked me to explore
> options that does not add a new @CallerSensitive entry point, even to a
> strongly encapsulated API like JavaLangAccess
> Easiest of these is to explicitly provide the class context we're
> calling from - with proper assertions. This is marginally more
> performant due avoiding the Reflection.getCallerClass, but slightly less
> convenient.
> http://cr.openjdk.java.net/~redestad/8227587/open.01/
> /Claes
> On 2019-07-12 15:27, Roger Riggs wrote:
>> Hi Claes,
>> Looks fine.
>> Thanks for the updates, Roger
>> On 7/11/19 10:39 AM, Claes Redestad wrote:
>>> Hi Roger,
>>> On 2019-07-11 16:10, Roger Riggs wrote:
>>>> Hi Claes,
>>>> JavaLangAccess.java:
>>>> 316: Add @param tag
>>> done.
>>>> System.java:  2282, 2287
>>>> Runtime.loadLibrary0 makes a second check for a security manager.
>>>> Is there any potential gain by calling ClassLoader.loadLibrary 
>>>> directly?
>>>> None of the internal uses would have a separatorChar.
>>> Most of the gain comes from not having to load one-off PA classes or
>>> lambdas, but of course avoiding the indexOf and a few indirections are
>>> marginally helpful to startup. We should at least assert that the
>>> library names are sane, though.
>>>> I expect most of the files need a copyright update.
>>>> The script in <repo>/make/scripts/update_copyright_year.sh should 
>>>> do the work for modified files.
>>> Fixed copyrights and updated in place: 
>>> http://cr.openjdk.java.net/~redestad/8227587/open.00
>>> Thanks!
>>> /Claes

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