lkml.org 
[lkml]   [2011]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering
    From
    On Thu, May 26, 2011 at 1:33 PM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    > On Thu, May 26, 2011 at 10:38 AM, Will Drewry <wad@chromium.org> wrote:
    >>>
    >>> One option is to just not ever allow execve() from inside a restricted
    >>> environment.
    >>
    >> That'd certainly be fine with me.
    >
    > So if it ends up being purely a "internal to the process" thing, then
    > I'm much happier about it - it not only limits the scope of things
    > sufficiently that I don't worry too much about security issues, but it
    > makes it very clear that it's about a process going into "lock-down"
    > mode on its own.
    >
    > It also gets rid of all configuration - one of the things that makes
    > most security frameworks (look at selinux, but also just ACL's etc)
    > such a crazy rats nest is the whole "set up for other processes". If
    > it's designed very much to be about just the "self" process (after
    > initialization etc), then I think that avoids pretty much all the
    > serious issues.
    >
    > A lot of server processes could probably use it as a way to say "Hey,
    > I guarantee that I will only open new files read-only, and will only
    > write to the socket that was already opened for me by the accept", and
    > explicitly limit their worker threads that way.
    >
    > If that is really sufficient for some chrome sandboxing, then hey,
    > that's all fine.

    It adds some hoops, but less than exist today.

    > Sometimes limiting yourself (rather than looking for some bigger
    > "generic" solution) is the right answer.

    I will very happily validate usage and repost with a self-limited
    patch series. Doing so makes the change much more explicitly an
    expansion of seccomp, which keeps things sane.

    Thanks!
    will


    \
     
     \ /
      Last update: 2011-05-26 20:51    [W:0.074 / U:0.000 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site