Recover Directory Traversal

Quest: recover-directory-traversal

Mission

Remove and restore owner execute permission on an owned directory, then explain why entering it failed.

Commands You Will Use

mkdir
chmod
cd

Steps

Run cd ~/playground.
Run mkdir -p no-enter-demo.
Run chmod u-x no-enter-demo.
Try cd no-enter-demo; it should fail.
Run chmod u+x no-enter-demo.
Run cd no-enter-demo; it should now work.
Answer the guide: why did the first cd fail?

Hints

Directory x means traversal, not running a directory as a program.
Work only inside ~/playground.
Never remove execute permission from ~, ~/src, or ~/.ssh.

If Check Fails

Run the remove-and-restore chmod commands for no-enter-demo, then explain that directory execute permission permits traversal.