Re: [uml-devel] hostfs as root

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

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>>>>> "Matt" == Matt Zimmerman <mdz@debian.org> writes:
    >> Well, if the opener is root, you get to ignore the permissions. That
    >> means that something has to break.
    >> 
    >> I propose: stat(), save permissions chmod(u+rw) (as appropriate for
    >> the open) open() chmod(oldperms)

    Matt> Sounds like a recipe for lots of race conditions.

  Uh, how?
  Remember, this is in the kernel. We have locks.

  If two UMLs come along, using the same rootfs, well, that's a different
problem. 

    >> Well, leaving us in a lurch is decidely not friendly.  Your fix has
    >> broken debian potato's mount. Being able to run other distros,
    >> versions, etc. inside of UML is one of the major features of UML.

    Matt> OK, so mount is already fixed.  So the only problem is that you
    Matt> can't use an old, mildly buggy version of mount with root-hostfs as
    Matt> a non-root user on the host.  I'd rather be able to extract tar
    Matt> files than have that scenario.

  Okay. I see.

    Matt> You must have already worked around some other problems in order to
    Matt> run potato in this configuration; it wouldn't work out of the box
    Matt> with a 2.4 kernel.  How are you managing device nodes?  Loading any
    Matt> kernel modules?

  Works fine for me.
  It has been working fine for two years now.

]      Out and about in Ottawa.    hmmm... beer.                |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another Debian/notebook using, kernel hacking, security guy");  [

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