database access thru a kernel module?

[nikhil86]

Hi
I'm trying to write a loadable kernel module that performs integrity checking on ELF files as part of a college project.
I wrote a user-mode program for this, i.e. a command-line program that accepts the inode and filename of a file and performs a SHA1 on it and checks that hash against an existing ndbm database.
I tried putting that code into a kernel module, but it won't compile.

The basic architecture of my module is this:
Register the LSM hook like file_mmap.
Compute a SHA1 on that file when the hook is called
Check it against a known database.
Make a syslog entry if a mismatch is found.

Can anyone tell me how i should go about the database lookup?
Can a dbm database be accessed from the kernel? If so, how do i compile the file?
If not a dbm database, can another simpler databse be used which is compatible with the kernel?

I have compiled a hello-world kernel module.
I'm stuck at the point where a dbm lookup must be made, as the #includes like ndbm.h are rejected by the compiler gcc.

[Chris_C]

Couldn't you use Sqlite (SQLite Home Page) in embedded mode from a kernel module?