Hi, Basically is to create a partition which supports a stronger enabled FS. The 2 options I know of are : virtual disk via device mapper and real partition (FAT & EXT3)
More elaboration on the methods: It is possible to have a virtual drive on the FAT, namely, you have one file on the FAT and that found is mounted (via device mapper) as a file system, meaning that you can have full yaffs2 or any other type of supported FS by the kerne. If you will use encrypted FS(dm-crypt), it will protected the visibility of file when mounted onto PC. You need to make sure that the kernel supports device mapper, and make sure that on the initial mounting table the new partition appears. A different method could be 2 partitions, one is FAT and the other any FS you want that the linux supports. For this method you can use simple tools such as gparted to do that. Good Luck, Moses On Mon, Aug 3, 2009 at 11:24 PM, William Enck <[email protected]> wrote: > > Luis, > > You might look into a suitable way of securing data on the SDcard. It's a > FAT file system, so you can't use UNIX permissions to restrict applications. > Officially, nothing sensitive is supposed to be placed on the SDcard. > However, there are some situations (at least in my research) where it would > be nice to show through some sort of analysis that two applications truly > are isolated and can't share data, even through the SDcard. > > The difficulty is that the SDcard needs to be FAT, because the PC mounts > it. I read on one of the Android mailing lists a while back that there is a > desire not to make kernel modifications to support such isolation. That may, > or may not, be a requirement for you. > > This leaves the question of how to add security to the SDcard in such a way > that it still allows the user to access all of the files when mounted on a > PC. > > I've tried to get some Masters students here at Penn State to look at the > problem, but no one bit (yet). It's not a particularly deep research > problem, but it's something I'd like to see a good solution for. Part of > your evaluation should look at how existing applications use the SDcard and > whether or not your solution breaks these applications. Theoretically, > Content Providers should be used, but this might not always be the case. > > Best, > > -Will > > > Luis wrote: > >> Hi all, >> >> I am looking to contribute to Android security and at the same time >> write my thesis. >> I have experience in C++ programming as well as other languages; and >> also in coporate security management. >> >> Any ideas of topics where I could help? >> >> Luis >> >>
