[LTP] Issue observed with chmod05, fchmod05 test cases

[Sharyathi Nagesh <sharyath@in.ibm.com>]

Hi
   I am observing this anomaly with these 2 test cases chmod05.c and fchmod05.c.
These 2 test cases are written to test the POSIX standard which says:

  	"If the calling process is not privileged  (Linux:  does  not  have  the
        CAP_FSETID  capability),  and  the group of the file does not match the
        effective group ID of the process or one  of  its  supplementary  group
        IDs,  the  S_ISGID  bit  will be turned off, but this will not cause an
        error to be returned."


So the test case will try to setup a file in which the GID of the test/tmp file will be 
different from the effective group ID of the running process. But this criterion is found to 
be not sufficient condition for the clearing the S_ISGID bit of the file

------------------------------------------------------------
Ex:
There are 2 users nobody (uid=99, gid=99) and bin (uid=1, gid=1)
let as assume temporary file as /tmp/zxcv

Test will Pass if
     Set UID/GID of /tmp/zxcv to            nobody->uid & nobody->GID
     Set eUID/eGID of process to           nobody->uid & bin->GID

Test will Fail if
     Set UID/GID of /tmp/zxcv to            nobody->uid & bin->GID
     Set eUID/eGID of process to           nobody->uid & nobody->GID

I verified supplementary group IDs for both 'nobody' and 'bin' and they are mutually 
exclusive and none of the other is supplementary group ID of the ID being tested
------------------------------------------------------------

Should we treat this as Test case issue or kernel bug?

Thanks
Yeehaw

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