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SubjectRe: [PATCH 08/28] SECURITY: Allow kernel services to override LSM settings for task actions [try #2]

--- David Howells <dhowells@redhat.com> wrote:
> Stephen Smalley <sds@tycho.nsa.gov> wrote:
>
> > The cache files are created by the cachefiles kernel module, not by the
> > userspace daemon, and the userspace daemon doesn't need to directly
> > read/write them at all
>
> That is correct.
>
> > (but I think it does need to be able to unlink them?).
>
> Indeed.
>
> > The userspace daemon merely identifies the directory where the cache should
> > live as part of configuring the cache when enabling it.
>
> That is the way it currently works, yes.
>
> > Hence, it is fine to use a fixed label for the cache files (systemhigh
> > in a MLS world), and to let the directory's label serve as the basis for
> > it.
>
> That is what I currently do. SELinux rules are provided to grant the
> appropriate file accesses to the override label used by the kernel module, so
> that it can't go and stamp on files with the wrong label.
>
> > Only the cachefiles kernel module directly reads and writes the files.
>
> Correct.

Well, my bad, and thank you for clearing up my misunderstanding.


Casey Schaufler
casey@schaufler-ca.com


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