Error in CreateOUIProcess(): 13

hostname.SIDNAME-> _1" ORACLE_HOME_NAME="OraDb10g_home1"   <
./runInstaller -silent -clone -waitForCompletion  "ORACLE_HOME=/u01/app/oracle/product/10.2.0/db_1" "ORACLE_HOME_NAME=OraDb10g_home1" -noConfig -nowait
Starting Oracle Universal Installer...

No pre-requisite checks found in oraparam.ini, no system pre-requisite checks will be executed.
Preparing to launch Oracle Universal Installer from /tmp/OraInstall2007-12-21_02-47-18AM. Please wait ...Error in CreateOUIProcess(): 13
: Permission denied

[root@147327-web1 ~]# cat /etc/fstab
# This file is edited by fstab-sync - see 'man fstab-sync' for details
/dev/sda5               /                       ext3    defaults        1 1
/dev/sda1               /boot                   ext3    defaults        1 2
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /dev/shm                tmpfs   defaults,nosuid,nodev,noexec        0 0
none                    /proc                   proc    defaults        0 0
none                    /sys                    sysfs   defaults        0 0
/dev/sda2               /tmp                    ext3    defaults,nosuid,nodev,noexec        1 2
/dev/sda3               swap                    swap    defaults        0 0
/dev/sdb1               /mnt/drive2             ext3    defaults        1 3
/dev/hda                /media/cdrom            auto    pamconsole,exec,noauto,managed 0 0
/dev/fd0                /media/floppy           auto    pamconsole,exec,noauto,managed 0 0
[root@147327-web1 ~]#

change /tmp flags as follows (noexec prevents oracle installer to execute):

/dev/sda2               /tmp                    ext3    defaults,nosuid,nodev        1 2