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Re: [libvirt] [PATCH 3/4] lxc: validate container process during load config



On Fri, May 30, 2008 at 02:28:46AM -0400, Daniel Veillard wrote:
> On Thu, May 29, 2008 at 03:20:15PM -0700, Dave Leskovec wrote:
> > +            if (ESRCH == errno) {
> > +                rc = 0;
> > +                DEBUG("pid %d no longer exists", def->id);
> > +                goto done;
> > +            }
> > +
> > +            lxcError(NULL, NULL, VIR_ERR_INTERNAL_ERROR,
> > +                     _("error checking container process: %d %s"),
> > +                     def->id, strerror(errno));
> > +            goto done;
> > +        }
> 
>   The problem though is that by doing just  a passive test for the PID
> it feels like there is a possible race if the process counter rolled over and
> another process with the same PID got create in the meantime.
>   i have the feeling that a test based on the state of the file descriptors
> used to communicate with the container would be more reliable. Basically if the
> container disapear, then the pipe should get in a half-closed state, 
> detecting the change at that level sounds like it would be more reliable,
> don't you think so ?

Yes, after checking the PID still exists, it needs to validate /proc/$PID/exe
to verify it points to the binary we expect it to.

Regards,
Dan.
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