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    SubjectRe: [PATCH] proc: restrict access to /proc/interrupts
    On Mon, Nov 07, 2011 at 15:10 -0500, wrote:
    > On Mon, 07 Nov 2011 11:18:32 PST, "H. Peter Anvin" said:
    > > I would like to propose that we add a mount option to procfs, and
    > > possibly sysfs, called, say, admingrp. These kinds of files then get
    > > restricted to the admingrp (defaulting to gid 0 if no admingrp is
    > > provided). Historically on Unix there has been a group of people
    > > (usually "adm", but sometimes "log") who are allowed to read (but not
    > > write) the log files, which also contains potentially sensitive information.
    > Probably should be a two part - mount with 'gid=NNN', and then a
    > perm=027 or whatever, to be treated similar to a umask. So 027
    > would allow root to do anything, would disable write for the gid= group,
    > and turn it off completely for others. Less paranoid sites could mount
    > it with perm=002.
    > Does that cover most of the use cases?

    At the time of Linux 2.0-2.4 in Owl patch there was a plain on/off
    configure option - 022 / 066 umask. Currently procfs restriction is
    implemented in Grsecurity with the same all-or-nothing approach.
    Brad Spengler told me that there were no user complains about the lack of
    flexibility :-) So, I agree that we don't need anything more complex.


    Vasiliy Kulikov - bringing security into open computing environments

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