[LTP] ❌ FAIL: mkdtemp failed for EACCES when setresuid nobody

[Cixi Geng]

Hello everyone:

While testing some syscalls tests on our device,based on debian
rootfs, I got an error on many tests (running as "root" user).

Here is one of log:

<<<test_start>>>
tag=fchown03 stime=1478195083
cmdline="fchown03"
contacts=""
analysis=exit
<<<test_output>>>
fchown03    1  TBROK  :  tst_tmpdir.c:264: tst_tmpdir:
mkdtemp(/tmp/ltp-cawz3S2QlX/fchNeMx77) failed: errno=EACCES(13):
Permission denied
fchown03    2  TBROK  :  tst_tmpdir.c:264: Remaining cases broken
<<<execution_status>>>
initiation_status="ok"
duration=0 termination_type=exited termination_id=2 corefile=no
cutime=0 cstime=1
<<<test_end>>>
After I trace the kerenel syscalls, found it do a setresuid operate,
set uid to nobody.

I did test on my self C code, make that nobody did have no exec
permission to mkdtemp. other normal user successed.

So I pizzled that how to fix this error. need someone help me.
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