fchmod05: fix to the group ownership and the effective user

This patch fixed the modify of the group ownership before do dir chmod and fixed the effective user when do cleanup. Those problems cause the test failed with the following error message:

  fchmod05    1  FAIL  :  testdir: Incorrect modes 043777, Expected 0777
  fchmod05    0  WARN  :  tst_rmdir(): rmobj(/tmp/fchUout8n) failed: \

remove(/tmp/fchUout8n) failed; errno=1: Operation not permitted

Signed-off-by Wei Yongjun <[email protected]>

---
 testcases/kernel/syscalls/fchmod/fchmod05.c |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)

testcases/kernel/syscalls/fchmod/fchmod05.c +5 -5

index 3573f65..5226858 100644
@@ -154,10 +154,10 @@ int main(int ac, char **av)
 			if ((PERMS & ~S_ISGID) != dir_mode) {
 				tst_resm(TFAIL, "%s: Incorrect modes 0%03o, "
 					 "Expected 0%03o",
-					 TESTDIR, PERMS, MODE_RWX);
+					 TESTDIR, dir_mode, PERMS & ~S_ISGID);
 			} else {
 				tst_resm(TPASS, "Functionality of fchmod(%d, "
-					 "%#o) successful", fd, PERMS);
+					 "%#o) successful", fd, PERMS & ~S_ISGID);
 			}
 		} else {
 			tst_resm(TPASS, "call succeeded");

@@ -218,12 +218,12 @@ void setup()
 		tst_brkm(TBROK, cleanup, "mkdir(2) of %s failed", TESTDIR);
 	}
 
-	if (chown(TESTDIR, nobody_u->pw_uid, bin_group->gr_gid) == -1)
+	if (chown(TESTDIR, nobody_u->pw_uid, nobody_u->pw_gid) == -1)
 		tst_brkm(TBROK, cleanup, "Couldn't change owner of testdir: %s",
 				strerror(errno));
 
-	/* change to nobody:nobody */
-	if (setegid(nobody_u->pw_gid) == -1 || seteuid(nobody_u->pw_uid) == -1)
+	/* change to nobody:bin */
+	if (setegid(bin_group->gr_gid) == -1 || seteuid(nobody_u->pw_uid) == -1)
 		tst_brkm(TBROK, cleanup, "Couldn't switch to nobody:nobody: %s",
 				strerror(errno));