mount: Disabling execution of scripts

Written by Benjamin Cane on 2011-09-08 20:01:06

One of the common ways of securing your system is by making the /tmp filesystem unable to run executables. This prevents users from executing scripts in /tmp which is generally writable by everyone.

You can restrict this with the mount option noexec.

Here is an example:

[[email protected] playground]# mount | grep play  
/dev/mapper/vgfirst-lv_test1 on /var/tmp/playground type ext3 (rw)  
[[email protected] playground]# ./helloworld.sh   
Hello World  
[[email protected] playground]# mount -o remount,noexec /dev/mapper/vgfirst-lv_test1 /var/tmp/playground  
[[email protected] playground]# mount | grep play  
/dev/mapper/vgfirst-lv_test1 on /var/tmp/playground type ext3 (rw,noexec)  
[[email protected] playground]# ./helloworld.sh   
-bash: ./helloworld.sh: Permission denied  

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Benjamin is a Systems Architect working in the financial services industry focused on platforms that require Continuous Availability. He has been working with Linux and Unix for over 10 years now and has recently published his first book; Red Hat Enterprise Linux Troubleshooting Guide.

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