Re: [uml-devel] T-mode processes

[Michael Richardson <mcr@sandelman.ottawa.on.ca>]

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>>>>> "BlaisorBlade" == BlaisorBlade  <blaisorblade_spam@yahoo.it> writes:
    >> We also continue to have an issue with the /proc/PID/environ file
    >> not being owned by the process involved.

    BlaisorBlade> I'm looking at the permission in your listing and in
    BlaisorBlade> my linux, and I don't see anything strange. Plus, I
    BlaisorBlade> don't understand what you mean with "a file owned by a
    BlaisorBlade> certain process".

    BlaisorBlade> Do you mean "I start the process with uid build and
    BlaisorBlade> /proc/PID/* has uid root while it should have uid
    BlaisorBlade> build"?

  Yes.

    BlaisorBlade> If you mean this, the answer is that you seem to be
    BlaisorBlade> starting UML with one id and making it run with
    BlaisorBlade> another UID. At least, I see this permission situation
    BlaisorBlade> with the X Font Server:

  No, this is not the case.
  It runs as "build" and that is all. 

  The problem is that the use of mm confuses the proc-permission system
into thinking that the process is setuid. I wandered through this last
year, when we first noticed this problem.

  This seems to be due to how mm->dumpable is initalized.
(see task_dumpable in fs/proc/base.c)
  I tried to change it, but I was not successful. I can dig up my
attempts, but they are on the list.

- --
]     "Elmo went to the wrong fundraiser" - The Simpson         |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [

  
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