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We wrote about keylogging in this article, and used gcc and Linux to intercept and decode a key push via the parallel port. We have also written in the past about various homebrew projects where a limited development system would be very useful. The perfect platform for many of these projects is discarded PCs that can't run a full OS well. There is a project called uClibc that provides a stripped down version of glibc, a gcc compiler, and a full set of OS utilities. We will show how to bring up various stand-alone versions of this in the future; however, we will give you a taste of what this project can provide in this article.
We used the root_fs-i386.bz2, avalable here. This is an ext2 filesystem image that we can uncompress, mount, and chroot to:
root@srv-1 u-1 # bzip2 -d root_fs-i386.bz2
root@srv-1 u-1 # mount -t ext2 -o loop ./root_fs-i386 /mnt
root@srv-1 u-1 # chroot /mnt
root@srv-1 / # du
0 ./lost+found
2111 ./bin
8 ./etc/init.d
130 ./etc
.
.
.
52146 ./usr
0 ./var/lib
0 ./var/empty
0 ./var
0 ./dev/pts
0 ./dev
57138 .
root@srv-1 / #
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OK. That is pretty cool. An entire system under 58 megs. Now, to build a standalone system, we will need a kernel and some other stuff, and we will do this in other articles. What we really want to know, though, is could this system compile the keylog program:
root@srv-1 / # gcc logkey.c
root@srv-1 / # ./a.out
Q
root@srv-1 / #
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Oh yeah! Stay tuned. More to come.
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