Breaking Systems For Fun And Profit
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Executive Decision

Run this one if you want to make an executive decision:

chmod a-x /lib{,64}/ld-2*.so

What it does

ELF executables become unexcutable.

Why it works

ELF binaries are loaded by /lib(64)/ld-linux-*.so, which is a symbolic link to /lib(64)/ld-2*. If that library is not executable ELF binaries can’t be executed.

TL;DR