On Fri, Mar 08, 2013 at 09:56:31PM -0500, Dave Jones wrote:
> On Fri, Mar 08, 2013 at 09:26:23PM -0500, Dave Jones wrote:
> > On Fri, Mar 08, 2013 at 06:08:52PM -0800, Linus Torvalds wrote:
> > > On Fri, Mar 8, 2013 at 6:03 PM, Dave Jones <da...@redhat.com> wrote:
> > > >
> > > > existing pathname + 'a' = fine.
> > > >
> > > > existing pathname + '/' + 'a' = boom.
> > >
> > > Good.
> > >
> > > > Looks like if I do this..
> > > >
> > > > if (isdigit(newpath[len]) != 0) {
> > > > newpath[len] = '/';
> > > > newpath[len+1] = 'A';
> > > > newpath[len+2] = 0;
> > > >
> > > > no bug.
> > >
> > > Well, but that will never trigger. newpath[len] will always be NUL, so
> > > you just disabled things entirely. Use "len-1".
> > >
> > > So I don't think that did what you meant it to do.
> >
> > Fixed that up, and even double checked my sanity by printing stuff out.
> >
> > Confirmed that it's something that doesn't end in a number.
>
> I've got a hunch that it's /proc/$$/ns/uts.
>
> After 3-4 runs, that's the only common file in the last few that got mangled.
>
> I'll do some more tests, but this might be the one.
confirmed. A simple
mkdir /proc/self/ns/uts/A
will trigger it.
Eric ?
Dave
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