Re: [uml-devel] hostfs as root

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

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>>>>> "Adam" == Adam Heath <adam@doogie.org> writes:
    Adam> On Fri, 5 Sep 2003, Michael Richardson wrote:

    >> >> 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.

    Adam> No, it's a problem.  Just because there's no race in the emulated
    Adam> environment, doesn't mean there isn't a race in the host.

  I don't think that hostfs provides any inter-UML locking guarantees.
  What do we do with flock(2)?

  If you like, we can flock(2) the file too while we play with it.

]      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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