tree b44c2c0228284fffaa2f7a09de7bae85da0a3d72
parent 0c6181cb301fd04a5800920ba423be753b0a4a01
author Jeff Vander Stoep <jeffv@google.com> 1459886787 -0700
committer Paul Moore <paul@paul-moore.com> 1459887116 -0400

selinux: restrict kernel module loading

Utilize existing kernel_read_file hook on kernel module load.
Add module_load permission to the system class.

Enforces restrictions on kernel module origin when calling the
finit_module syscall. The hook checks that source type has
permission module_load for the target type.
Example for finit_module:

allow foo bar_file:system module_load;

Similarly restrictions are enforced on kernel module loading when
calling the init_module syscall. The hook checks that source
type has permission module_load with itself as the target object
because the kernel module is sourced from the calling process.
Example for init_module:

allow foo foo:system module_load;

Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
[PM: fixed return value of selinux_kernel_read_file()]
Signed-off-by: Paul Moore <paul@paul-moore.com>