App - Script

Hello,
I’ve copied ch11.c into /tmp and chmod 4777 /tmp/ch11.c , then edited the ls to cat.
but it gave me permission denied for cat .passwd

any help?

First, chmod on .c file does nothing, cos it cant even be executed and thus cant be a set-uid binary by itself. U need to chmod the ch11, the executable. And u may need to log in as root. Seems, root should be able to read .passwd, cos it has rights of 400. Although it does nothing for me (pic).