LD_PRELOAD with setuid binary

Question

I am trying to use LD_PRELOAD to preload a library with an application that has setuid permissions. Tried LD_PRELOAD at first, and it seemed like i

Answer 1

Install your lib as such:

• location: /lib or /usr/lib
• permissions: root:root
• has setuid and setgid on

Make sure LD_PRELOAD is exported to your environment

$ export LD_PRELOAD=/usr/lib/yourlib.so
$ env | grep LD_PRELOAD  # verify

Then run your program.