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    SubjectRe: [RFC][PATCH 0/3] Access Control Lists for tmpfs and /dev/pts
    On Wed, 2 Feb 2005, Andreas Gruenbacher wrote:

    > On Wed, 2005-02-02 at 17:55, Christoph Hellwig wrote:
    >> On Wed, Feb 02, 2005 at 05:13:40PM +0100, Andreas Gruenbacher wrote:
    >>> Here is a set of three patches which implement some general
    >>> infrastructure and on top of that, acls for tmpfs and /dev/pts files.
    >>
    >> Why would you want ACLs on /dev/pts?
    >
    > That's actually a good question. The patch allows to give several people
    > access to the same terminal, which sometimes comes in handy with tools
    > like screen (at least in its current version), and that's what the patch
    > originally was meant for. I've just talked this over this with one of
    > the maintainers though, and there are probably better ways than handling
    > this at the file permission level, like passing open file descriptors
    > between processes. So unless somebody comes up with a convincing
    > application, that patch probably should stay out.
    Aside from the above reason, I believe the mechanism behind the write
    command should also be considered. The notifications generated by write
    can currently be enabled and disabled only through an "all-on" or
    "all-off" mechanism - it doesn't leave room for user- or group-specific
    permissions because it's based on the mode of the TTY special file.

    ACL support in devpts would allow much more fine-grained control of who
    is allowed and who is denied access to writing messages on your terminal.
    This would come in very handy and I personally believe it should be
    possible to have such control.

    Sorry for the random post and thanks for considering this reason,
    Catalin Patulea
    >
    > Cheers,
    > --
    > Andreas Gruenbacher <agruen@suse.de>
    > SUSE Labs, SUSE LINUX GMBH
    >
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    >

    -----------------------------------------
    Catalin Patulea VV Volunteer 2002,3
    http://vv.carleton.ca/~cat/ VV HI 2004,5
    cat@vv.carleton.ca
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