Per-Process Namespaces

February 19th, 2009

Our main development servers at work use almost 100% free software; however, recently I had a rare pleasure of having to install a piece of a binary blob. The Blob reared its ugly head as soon as I tried its installation routine:

dev_server# ./blob_install
Your Linux distribtion ‘Debian GNU/Linux 5.0 \n \l’ is unsupported.
Supported distributions: Fedora 8, 9 and 10; Ubuntu 8.04 and 8.10.
Exiting.

Read on to see how per-process namespaces can help defeat The Blob.


Attack

The Blob’s only function is to check out pre-compiled software from one of our subcontractor’s SVN servers, create workspace ( read: create a bunch of directories, move some files around, maybe set up a few links, check availability of some tools ). In short: it sets up environment for development. It is purely a console software, has no graphical parts, for sure does not interact with any other processes or daemons, does not use any advanced libraries and as such, should easily work in Debian or any other reasonably recent distribution.

So let’s install it anyway: run it under strace and see it open /etc/issue:

dev_server# cat /etc/issue
Debian GNU/Linux 5.0 \n \l

Now open blob_install with a hex editor and notice that it expects “Ubuntu 8.10 \n \l” there. Temporarily change /etc/issue and watch The Blob install flawlessly.

Blob Strikes Back

At this point I thought I could just change /etc/issue back to its Debian version and start using The Blob; unfortunately, it turned out I underestimated its stubbornness: it actually checks the distribution every single time it performs any action.

It thus became clear that I would either have to permanently keep /etc/issue
in its Ubuntu form (which I don’t want to do) or try to fool The Blob in some more clever way.

Regrouping

Fortunately I stumbled upon Mike Hommey’s excellent write-up about per-process namespaces.

Per-process namepaces let one selectively ‘unshare’ any resources that were being shared at the time of creation of the process. This feature, among other things, allows each process to have a different set of mount points. Combined with bind mounts, it can allow some useful setups: we can create a new namespace, bind-mount something, run a process and only this process (and its children) will see the new mount. Furthermore, as soon as the process which created the namespace exits, the namespace and mounts inside it disappear.

Let’s see an example. First we have to create a new namespace. This can be achieved with help of Mike’s helper program ‘newns’:

#include <sched.h>
#include <syscall.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
syscall(SYS_unshare, CLONE_NEWNS);
if (argc > 1)
return execvp(argv[1], &argv[1]);
return execv(“/bin/sh”, NULL);
}

Here we used the unshare(2) syscall to create the namespace – we have to do it this way because Lenny’s glibc does not implement the syscall.

Compile this , create two files

dev_server# echo FIRST > first
dev_server# echo SECOND > second

and try

dev_server# ./newns
dev_server# mount -n –bind second first
dev_server# cat first
SECOND

Now in a different console

dev_server# cat first
FIRST

You can see that the bind-mount is only seen by the process which called ‘unshare’ and its children. More concise way to see the above is

dev_server# ./newns sh -c “mount -n –bind second first; cat first”
SECOND
dev_server# cat first
FIRST

Counterattack

Armed with this knowledge we can attack The Blob again:

1) Create /etc/issue.ubuntu with the proper Ubuntu string inside
2) move The Blob’s binaries to /usr/local/bin/theblob
3) create a script /usr/local/bin/ubuntize:

#!/bin/sh

./newns sh -c “mount -n –bind /etc/issue.ubuntu /etc/issue; /usr/local/bin/theblob/$0 $@”

4) for each binary, create a link:

dev_server# ln -s /usr/local/bin/ubuntize /usr/local/bin/blob_install
dev_server# ln -s /usr/local/bin/ubuntize /usr/local/bin/blob_checkout
dev_server# ln -s /usr/local/bin/ubuntize /usr/local/bin/blob_create
… and so on …

And we’re done! The Blob’s binaries think they are running on a Ubuntu 8.10 system, and everything else continues to work normally. Victory!

References

For a more advanced example of what per-process namespaces can do, take a look here:

http://glandium.org/blog/?p=224

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