On Tue, Mar 11, 2014 at 10:01:35AM +0900, Joonsoo Kim wrote:
> On Tue, Mar 11, 2014 at 09:35:00AM +0900, Joonsoo Kim wrote:
> > On Fri, Mar 07, 2014 at 11:18:30AM -0600, Christoph Lameter wrote:
> > > Joonsoo recently changed the handling of the freelist in SLAB. CCing him.
> > >
> > > > I pretty much always use SLUB for my fuzzing boxes, but thought I'd
> > > > give SLAB a try
> > > > for a change.. It blew up when something tried to read
> > > > /proc/slab_allocators
> > > > (Just cat it, and you should see the oops below)
> >
> > Hello, Dave.
> >
> > Today, I did a test on v3.13 which contains all my changes on the handling
> > of
> > the freelist in SLAB and couldn't trigger oops by just 'cat
> > /proc/slab_allocators'.
> >
> > So I look at the code and find that there is race window if there is
> > multiple users
> > doing 'cat /proc/slab_allocators'. Did your test do that?
>
> Opps, sorry. I am misunderstanding something. Maybe there is no race.
> Anyway, How do you test it?
1. build kernel with CONFIG_SLAB=y.
2. boot kernel
3. cat /proc/slab_allocators
that's it.
Dave
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