hg: jdk8/tl/jdk: 8019224: add exception chaining to RMI CGIHandler

Stuart Marks stuart.marks at oracle.com
Thu Jun 27 18:16:33 PDT 2013


Hi Bernd,

A fair question. The Throwable.printStackTrace() call goes to the standard 
error stream, which is *usually* not mixed with the HTTP response collected 
from stdout and thus shouldn't spoil the protocol. But this really depends on 
how it's invoked. My assumption is that stderr is usually connected to 
somewhere suitable like an error log file, but this isn't always the case.

Unfortunately the handler methods don't have any better place to send error 
output. Reformatting it into a valid HTTP error response and sending it back to 
the client is bad form. One could open a log file and send it there, I suppose, 
but this seems worse than just relying on the calling web server to have 
redirected stderr somewhere reasonable.

The CGI wrappers for this class (src/windows/bin/java-rmi.c and 
src/solaris/bin/java-rmi.cgi.sh) inherit stderr from their invoker.

As for whether anybody uses this ... well, if you hear of anybody, please let 
me know. We do have a test for it -- closed source, unfortunately -- which has 
started failing, which is the main impetus for this change. (We suspect a 
configuration issue in our test environment.)

Thanks for looking.

s'marks





On 6/27/13 2:11 PM, Bernd Eckenfels wrote:
> Hello,
> (sorry for answering to security-dev, I am not subscribed to the others)
>
> the printStackTrace() seems wrong. This will ruin the HTTP Headers produced by
> returnXXXError() (if it is not too late at that point anyway as the execute()
> might also write data before).
>
> I also think that if you want to output the stack trace, it should be done
> inside those two handlers.
>
> BTW: Is somebody really using this?
>
> Greetings
> Bernd
>
>
> Am 27.06.2013, 22:33 Uhr, schrieb <stuart.marks at oracle.com>:
>
>> Changeset: 6729f7ef94cd
>> Author:    smarks
>> Date:      2013-06-27 13:35 -0700
>> URL:       http://hg.openjdk.java.net/jdk8/tl/jdk/rev/6729f7ef94cd
>>
>> 8019224: add exception chaining to RMI CGIHandler
>> Reviewed-by: darcy
>>
>> ! src/share/classes/sun/rmi/transport/proxy/CGIHandler.java


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