[PATCH v2] ima: export the measurement list when needed

[Janne Karhunen]

On Wed, Jan 8, 2020 at 1:18 PM Janne Karhunen <janne.karhunen at gmail.com> wrote:
>
> Some systems can end up carrying lots of entries in the ima
> measurement list. Since every entry is using a bit of kernel
> memory, allow the sysadmin to export the measurement list to
> the filesystem to free up some memory.

Hopefully this addressed comments from everyone. The flush event can
now be triggered by the admin anytime and unique file names can be
used for each flush (log.1, log.2, ...) etc, so getting to the correct
item should be easy.

While it can now be argued that since this is an admin-driven event,
kernel does not need to write the file. However, the intention is to
bring out a second patch a bit later that adds a variable to define
the max number of entries to be kept in the kernel memory and
workqueue based automatic flushing. In those cases the kernel has to
be able to write the file without any help from the admin..


--
Janne