[EXTERNAL] Re: JDK-8234076 bug fix candidate

Nikola Grcevski Nikola.Grcevski at microsoft.com
Mon Dec 2 19:34:00 UTC 2019

Hi Alan and Henry,

Thank you for reviewing my email! Henry's observation matches mine, the shared common code for all platforms in checkArg (src/java.base/share/native/libjli/args.c) can potentially leave the firstAppArgIndex static set to -1, if all passed command line arguments are prefixed with a dash. Later on the arguments are validated, however we might crash before then on Windows because of the negative index access. In this case, the customer command was valid (modules usage) and the program runs successfully.

I created a webrev here for the change, including a new test in Arrrghs.java:


I copied the test validation and assertion style of other code inside the test class.

Please let me know if you have any comments or suggestions.

Thanks again!

-----Original Message-----
From: Henry Jen <henry.jen at oracle.com> 
Sent: December 2, 2019 12:26 PM
To: Alan Bateman <Alan.Bateman at oracle.com>
Cc: Nikola Grcevski <Nikola.Grcevski at microsoft.com>; core-libs-dev at openjdk.java.net
Subject: [EXTERNAL] Re: JDK-8234076 bug fix candidate

The fix looks reasonable to me, basically, if the command argument format is not legal, it’s possible we won’t find the main class when doing argument file expansion, and the index is -1 which could cause crash on Windows platform for the wildcard processing.

I think we should add a test case for this, probably in test/jdk/tools/launcher/Arrrghs.java.

As I understand it, the argument validation is done in a later stage after calling JLI_Launch.


> On Dec 2, 2019, at 2:12 AM, Alan Bateman <Alan.Bateman at oracle.com> wrote:
> On 20/11/2019 19:42, Nikola Grcevski wrote:
>> :
>> Please let me know if this approach is acceptable for the current bug report and I'll make a webrev and include appropriate launcher tests. I was thinking the tests should do extra validation on the output from _JAVA_LAUNCHER_DEBUG on Windows.
> I think you're in the right area but I would have expected the arg index to 0 here. Henry Jen (cc'ed) might have some comments on this.
> -Alan

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