[lkml]   [2003]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] Allow /dev/{,k}mem to be disabled to prevent kernel from being modified easily
    On Sun, Aug 03, 2003 at 02:33:01PM -0700, David Lang wrote:

    > we already have the option to not support modules (as Alan Cox points out
    > every time that subject comes up it can be bypassed by people who have
    > access to /dev/*mem) so it would seem that adding the option to bar access
    > to /dev/*mem as well would make exisitng config options mean what they
    > appear to mean.

    This was also on my mind, yes. As Wichert said, not all holes are closed
    then, there is also /dev/microcode, iopl() and more.

    However, perhaps we could all sweep them under the "don't allow userspace to
    touch kernel memory easily" banner?

    We can leave more finegrained tools to outside patchsets then.

    I think root will always be able to figure out a way to get into the
    kernel's innards, but we can raise the bar quite a lot easily without too
    much infrastructure.

    As to what Alan said about LSM, I've yet to see how to do that in a
    reasonable way. But I didn't look too hard.

    As to what Andries said, how about '/proc/sys/raw_memory_access'?


    -- Open source, database driven DNS Software Linux Advanced Routing & Traffic Control HOWTO
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:47    [W:0.025 / U:74.692 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site