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    SubjectRe: Time to remove LSM (was Re: [RESEND][RFC][PATCH 2/7] implementation of LSM hooks)
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    On Mon, 2006-04-24 at 08:29 -0500, Serge E. Hallyn wrote:
    > Quoting Arjan van de Ven (arjan@infradead.org):
    > > On Mon, 2006-04-24 at 08:09 -0500, Serge E. Hallyn wrote:
    > > > Quoting Arjan van de Ven (arjan@infradead.org):
    > > > > for all such things in the first place. In fact, we already know that to
    > > > > do auditing, LSM is the wrong thing to do (and that's why audit doesn't
    > > > > use LSM). It's one of those fundamental linux truths: Trying to be
    > > >
    > > > As I recall it was simply decided that LSM must be "access control
    > > > only", and that was why it wasn't used for audit.
    > >
    > > no you recall incorrectly.
    > > Audit needs to audit things that didn't work out, like filenames that
    > > don't exist. Audit needs to know what is going to happen before the
    > > entire "is this allowed" chain is going to be followed. SELInux and
    > > other LSM parts are just one part of that chain, and there's zero
    > > guarantee that you get to the LSM part in the chain..... Now of course
    >
    > Ah yes. It needed to be authoritative. I did recall incorrectly.
    >
    > I suspect some would argue that you are right that LSM is broken, but
    > only because it wasn't allowed to be authoritative.

    authoritative isn't enough; think about it. The VFS isn't ever going to
    ask "can I open this file" if the file doesn't exist in the first place;
    same in many other places. You'd have to almost double the hooks, and as
    I said, to call those hooks "LSM" would be silly and dishonest.

    LSM is not Hooks-R-Us. It's a permission model.


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