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

    --- David Howells <> wrote:

    > Casey Schaufler <> wrote:
    > > What sort of authorization are you thinking of? I would expect
    > > that to have been done by cachefileselinuxcontext (or
    > > cachefilesspiffylsmcontext) up in userspace. If you're going to
    > > rely on userspace applications for policy enforcement they need
    > > to be good enough to count on after all.
    > It can't be done in userspace, otherwise someone using the cachefilesd
    > interface can pass an arbitrary context up.

    Yes, but I would expect that interface to be protected (owned by root,
    mode 0400). If /dev/cachefiles has to be publicly accessable make it
    a privileged ioctl.

    > The security context has to be
    > passed across the file descriptor attached to /dev/cachefiles along with the
    > other configuration parameters as a text string.

    I got that.

    > This fd selects the
    > particular cache context that a particular instance of a running daemon is
    > using.

    Yes, but forgive me being slow, I don't see the problem.

    Casey Schaufler

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      Last update: 2007-12-12 20:47    [W:0.021 / U:4.024 seconds]
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