A user can link a module into the
running kernel by executing the
external program. This program performs
the following operations:
Reads from the command line the name of the module to be linked.
Locates the file containing the module’s object code
in the system directory tree. The file is usually placed in some
Computes the size of the memory area needed to store the module code,
its name, and the
create_module( ) system call, passing
to it the name and size of the new module. The corresponding
sys_create_module( ) service routine performs the
Checks whether the user is allowed to link the module (the current
process must have the
In any situation where one is adding functionality to a kernel, which
has access to all data and processes on the system, security is a
find_module( ) function to scan the
module_list list of
objects looking for a module with the specified name. If it is found,
the module has already been linked, so the system call terminates.
vmalloc( ) to allocate a memory area for
the new module.
Initializes the fields of the
module object at the
beginning of the memory area and copies the name of the module right
below the object.
module object into the list pointed to
Returns the starting address of the memory area allocated to the module.