Re: [PATCH] protect remove_proc_entry

[Andrew Morton <akpm@osdl.org>]

Steven Rostedt <rostedt@goodmis.org> wrote:
>
> On Fri, 2005-12-30 at 17:09 -0500, Steven Rostedt wrote:
> 
> > Index: linux-2.6.15-rc7/fs/proc/generic.c
> > ===================================================================
> > --- linux-2.6.15-rc7.orig/fs/proc/generic.c	2005-12-30 14:19:39.000000000 -0500
> > +++ linux-2.6.15-rc7/fs/proc/generic.c	2005-12-30 17:05:56.000000000 -0500
> > @@ -693,6 +693,8 @@
> >  	if (!parent && xlate_proc_name(name, &parent, &fn) != 0)
> >  		goto out;
> >  	len = strlen(fn);
> > +
> > +	lock_kernel();
> >  	for (p = &parent->subdir; *p; p=&(*p)->next ) {
> >  		if (!proc_match(len, fn, *p))
> >  			continue;
> > @@ -713,6 +715,7 @@
> >  		}
> >  		break;
> >  	}
> > +	unlock_kernel();
> >  out:
> >  	return;
> >  }
> > 
> 
> FYI, to make sure that this solves the problem, I'm removing my locking
> in my kernel and using this instead.  It usually crashes in a day or
> two, so I can say this works if it makes it three days.
> 

I guess the lock_kernel() approach is the way to go.  Fixing a race and
de-BKLing procfs are separate exercises...

Did the patch work?