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    SubjectRe: [Keyrings] Re: [PATCH 01/04] Add multi-precision-integer maths library
    On Sun, Jan 29, 2006 at 02:09:08PM +0100, Arjan van de Ven wrote:
    >
    > >
    > > You are taking the wrong approach.
    > >
    > > The _only_ question that matters is:
    > > Why is it technically impossible to do the same in userspace?
    > >
    > > If it's technically possible to do the same in userspace, it must not be
    > > done in the kernel.
    >
    >
    > that is not a reasonable statement because...
    > 1) you can do all of tcp/ip in userspace just fine
    > 2) you can do the NFS server in userspace
    > 3) ...
    > 4) ...
    >
    > there are reasons why things that can be done in userspace sometimes
    > still make sense to do in kernel space, performance could be one of
    > those reasons, being unreasonably complex in userspace is another.

    Agreed, my sentence was too general.

    > Identity management to some degree belongs in the kernel, simply because
    > identity *enforcing* is in the kernel. Some things related to security
    > need to be in the kernel at least partially just to avoid a LOT of hairy
    > issues and never ending series of security holes due to the exceptional
    > complexity you get.

    OK, this sounds reasonable in the cases where the enforcing is actually
    in the kernel (but not in the backup daemon example from this thread).

    cu
    Adrian

    --

    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

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