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    SubjectRe: [PATCH 01/11] Security: Add hook to get full maclabel xattr name

    --- Dave Quigley <> wrote:

    > On Thu, 2008-02-28 at 20:00 -0500, Christoph Hellwig wrote:
    > > On Thu, Feb 28, 2008 at 07:32:47PM -0500, Dave Quigley wrote:
    > > > I can always go with the original hook name of get_security_xattr_name
    > > > which turns into a security_get_security_xattr_name call which seems a
    > > > bit ludicrous. The only other complaint that I saw from Casey besides
    > > > the name of the function was that there could be more than one xattr. If
    > > > we want to address that then I need another hook that says give me all
    > > > data that the LSM deems important for this file. Which is essentially
    > > > the same thing as taking each of the xattr names that the module will
    > > > provide, grabbing each of them in turn, and concatenating them together.
    > > > For SELinux this is no different than getsecurity with the selinux
    > > > suffix. The same goes for SMACK.
    > >
    > > What about Casey's suggestion of get_security_blob? For any reasonable
    > > module that just has a single xattr it's trivial and for those that
    > > have multiple or a different storage model it might get complicated
    > > but that's not our problem for now.
    > If this is the method we are going to use then we need a corresponding
    > set_security_blob as well.

    Not to sound stupid, but why would you need this?

    > This seems like a paradigm shift for
    > accessing security information in the kernel.

    Well, yes, but look at David Howell's file cacheing work
    before you take too firm a stand.

    > I said to Casey in the
    > beginning that I'd be willing to revisit it but that neither he or I
    > alone could make the decision. Unless I misunderstood the original
    > mandate for security information and that it only applies to how user
    > space accesses it.

    Sorry, I don't understand how user space and mandates go together here.

    Casey Schaufler

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