RFR: 8221639: [x32] expand_exec_shield_cs_limit workaround is undefined code after JDK-8199717

[Andrew John Hughes]

On 24/04/2019 14:33, Florian Weimer wrote:
> * Severin Gehwolf:
> 
>> Hi,
>>
>> Could I please get reviews for this Linux x32 fix? JDK-8199717 added a
>> performance optimization to only capture the initial stack size when
>> launched via non-java launchers. However, on Linux x32,
> 
> Do you mean actual x32, or i386?  These two are different.
> 
> Can you actually verify changes in this area?  I think it's pretty hard
> these days to find a machine that actually uses the CS hack to avoid
> universal read-implies-exec.  I don't think this was ever part of any
> mainline kernel.
> 
> Thanks,
> Florian
> 

I don't believe OpenJDK has support for x32. At least, we've had a
ticket for it for a long time and I've never had the time to look at
getting even Zero to build on such a platform:

https://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1300
-- 
Andrew :)

Senior Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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