This reminds me of a much older hack:

From: Roland McGrath
Subject: The syntactic power of Mocklisp with the type-safety of C!
Date: Tue, 25 Jun 1996 14:09:05 -0400

On lsd.gnu.ai.mit.edu, try running `/lib/ld-gnu.so.1 /usr/lib/libdl.so'. I whipped up a quick trivial parser for symbols, strings, integers, and lists, and just implemented the obvious functionality (see /src/libc/elf/eval.c).

        delasyd 302 & /lib/ld-gnu.so.1 /usr/lib/libdl.so
        (printf "I am %d in %d\n" (getuid) (getpid))
        I am 5281 in 28127
        (exit 42)
        [Exit 42]
        delasyd 303 ) /lib/ld-gnu.so.1 /usr/lib/libdl.so
        (kill (getppid) 1)

        Process shell hangup

Muwahahahah.  It probably only works on the i386, but I am going to leave this in there so by next year most every Linux machine has an escape hatch when the compiler isn't there and the program you need is fucked.
I envision:

# /lib/ld-gnu.so.1 /usr/lib/libdl.so
(open "/dev/hda1" 2)
(write 2 "my fucking boot blocks" 37)
(sync)
(reboot 0)

Sadly it's been broken for years.  It just segfaults when you try to execute it now, and no one's been motivated to fix it.  And by no one I mean me, since probably only 3 people in the world ever even knew about it.  Until just now.