Removing Execution Permissions from Bin Improves Performance

Many users are familiar with the concept that files and directories on Linux have permissions to read, write, and execute. One common permission is X (execute), which allows execution of a file.

Why does executing a binary slow down system performance?

Resource consumption: Executing a binary consumes system resources such as CPU cycles and memory.
CPU overhead: The OS has to handle the execution of binaries, which involves loading the program into memory and running it.
Memory usage: Binary execution increases memory usage compared to simply reading its contents.

Solution: Remove Execute Permissions from Binaries

To remove execution permissions from a binary:

Use the chmod command:

chmod -x filename

Or, if you're editing a file with a text editor, delete the Executables line in the etc/ldm.conf file.

Performance Benefits:

Lower CPU utilization during binary execution.
Reduced memory footprint when running binaries.
Improved overall system performance by minimizing resource contention.

Additional Tips:

Consider removing setuid and setgid permissions for all binaries.
For root-only operations, ensure that sudo is properly configured.
Regularly audit file permissions using find and chmod commands.

Note: This guide is provided for educational purposes only. Always ensure that you understand the implications of changing file permissions before applying them.

— A DevOps Engineer