LinuxHostingSupport

How to secure /tmp and /dev/shm partitions?

It is highly recommended to mount /tmp and /dev/shm partitions in noexec,nosuid mode in order to prevent files been executed under those partitions. To mount /tmp and /dev/shm in noexec,nosuid more, edit the /etc/fstab file and

search for the word

"defaults" 

in front of the 2 partitions and replace them with

rw,noexec,nosuid

The entry should look like the following:

tmpfs /dev/shm  tmpfs   rw,noexec,nosuid  0 0

and same for /tmp partition as well.

Save the /etc/fstab file. You now need to remount the partitions for the changes to take effect. Execute the following remount commands:

root@host [~]# mount -o remount /tmp
root@host [~]# mount -o remount /dev/shm

You can now check the mounted partitions using the command:

root@host [~]# mount

Related Links:

How to secure /tmp on a VPS?

How to check the Linux Server Uptime?

There are different ways to check the uptime of the Linux server like using the “top”  OR the “uptime” OR the “w” command. Following are some of them:

root@host [~]# top c
top – 15:50:20 up 2 days, 11:32,  1 user,  load average: 0.00, 0.00, 0.00

root@host [~]# uptime
15:51:01 up 2 days, 11:33,  1 user,  load average: 0.00, 0.00, 0.00

root@host [~]# w
15:51:07 up 2 days, 11:33,  1 user,  load average: 0.00, 0.00, 0.00