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    SubjectRe: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching
    On Sun, 10 Jun 2007, Pavel Machek wrote:

    > Hi!
    >
    >>> So, AA developers, do you have such a document anywhere? I know there
    >>> are some old research papers, do they properly describe the current
    >>> model you are trying to implement here?
    >>
    >> Greg,
    >> to implement the AA approach useing SELinux you need to have a way that
    >> files that are renamed or created get tagged with the right label
    >> automaticaly with no possible race condition.
    >>
    >> If this can be done then it _may_ be possible to do the job that AA is
    >> aimed at with SELinux, but the work nessasary to figure out what lables
    >> are needed on what file would still make it a non-trivial task.
    >>
    >> as I understand it SELinux puts one label on each file, so if you have
    >> three files accessed by two programs such that
    >> program A accesses files X Y
    >> program B accesses files Y Z
    >>
    >> then files X Y and Z all need seperate labels with the policy stateing
    >> that program A need to access labels X, Y and program B needs to access
    >> files Y Z
    >>
    >> extended out this can come close to giving each file it's own label. AA
    >> essentially does this and calls the label the path and computes it at
    >> runtime instead of storing it somewhere.
    >
    > Yes, and in the process, AA stores compiled regular expressions in
    > kernel. Ouch. I'll take "each file it's own label" over _that_ any time.

    and if each file has it's own label you are going to need regex or similar
    to deal with them as well.

    David Lang
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