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    SubjectRe: [PATCH] ptrace: allow restriction of ptrace scope
    Eric W. Biederman wrote:
    > Theodore Tso <tytso@MIT.EDU> writes:
    >> i think we really need to have stacked LSM's,


    >> because there is a large set
    >> of people who will never use SELinux. Every few years, I take another
    >> look at SELinux, my head explodes with the (IMHO unneeded complexity),
    >> and I go away again...
    >> Yet I would really like a number of features such as this ptrace scope idea ---
    >> which I think is a useful feature, and it may be that stacking is the only
    >> way we can resolve this debate. The SELinux people will never believe that
    >> their system is too complicated, and I don't like using things that are impossible
    >> for me to understand or configure, and that doesn't seem likely to change anytime
    >> in the near future.
    >> I mean, even IPSEC RFC's are easier for me to understand, and that's saying
    >> a lot...
    > If anyone is going to work on this let me make a concrete suggestion.
    > Let's aim at not stacked lsm's but chained lsm's, and put the chaining
    > logic in the lsm core.

    It's 35 years since my data structures course. What's the important
    difference between the two?

    > The core difficulty appears to be how do you multiplex the security pointers
    > on various objects out there.

    That and making sure that the hooks that maintain state get called
    even if the decision to deny access has already been made by someone

    > My wishlist has this working so that I can logically have a local security
    > policy in a container, restricted by the global policy but with additional
    > restrictions.
    > Eric
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