  The Linux kernel is one of the most important Free/Libre Open Source Software
(FLOSS) projects. It is installed on billions of devices all over the world,
which process various sensitive, confidential or simply private data. It is
crucial to establish and prove its security properties. This work-in-progress
paper presents a method to verify the Linux kernel for conformance with an
abstract security policy model written in the Event-B specification language.
The method is based on system call tracing and aims at checking that the
results of system call execution do not lead to accesses that violate security
policy requirements. As a basis for it, we use an additional Event-B
specification of the Linux system call interface that is formally proved to
satisfy all the requirements of the security policy model. In order to perform
the conformance checks we use it to reproduce intercepted system calls and
verify accesses.
