Incorrect default cache directory permission on z/OS Java 11+

[hangshao0]

On z/OS, the default cache directory is /tmp/javasharedresources/. The default permission for this directory is 0777 on Java 8. We will always change it to 0777 after creation (see perms = in trace j9prt.124):

rm -rf /tmp/javasharedresources/
java -Xshareclasses -Xtrace:print={j9prt.124-126} -version
JVMJ9VM082E Unable to switch to IFA processor - issue "extattr +a libj9ifa29.so"
16:07:31.728*0x1c1d3200           j9prt.124      > j9sharedhelper change shared directory permission entered dir = /tmp/javasharedresources/, perms = 1ff
16:07:31.729 0x1c1d3200           j9prt.125      < j9sharedhelper change shared directory permission successful exit
java version "1.8.0_411"

On Java 11+, OpenJ9 only changes the permission to 0777 after creation if -Xshareclass is specified:

rm -rf /tmp/javasharedresources/
java -Xshareclasses -Xtrace:print={j9prt.124-126} -version
JVMJ9VM082E Unable to switch to IFA processor - issue "extattr +a libj9ifa29.so"
16:10:47.761*0x1c670600           j9prt.124      > j9sharedhelper change shared directory permission entered dir = /tmp/javasharedresources/, perms = 1ff
16:10:47.762 0x1c670600           j9prt.125      < j9sharedhelper change shared directory permission successful exit

On Java 11+, if -Xshareclass is not specified (SCC enabled by default), the permission is not changed to 0777, which is incorrect:

rm -rf /tmp/javasharedresources/
java -Xtrace:print={j9prt.124-126} -version
JVMJ9VM082E Unable to switch to IFA processor - issue "extattr +a libj9ifa29.so"
16:13:49.314*0x1c670600           j9prt.124      > j9sharedhelper change shared directory permission entered dir = /tmp/javasharedresources/, perms = 0
16:13:49.315 0x1c670600           j9prt.125      < j9sharedhelper change shared directory permission successful exit

[tajila]

@hangshao0 any updates on this?

[hangshao0]

any updates on this?

A Pull Request will be created this week.