linux-kernel - Re: [PATCH v1 2/8] mm, kasan: SLAB support

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Date:	Mon, 1 Feb 2016 11:15:01 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Alexander Potapenko <glider@...gle.com>
Cc:	kasan-dev@...glegroups.com, Christoph Lameter <cl@...ux.com>,
	linux-kernel@...r.kernel.org, Dmitriy Vyukov <dvyukov@...gle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>, linux-mm@...ck.org,
	Andrey Konovalov <adech.fo@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, rostedt@...dmis.org
Subject: Re: [PATCH v1 2/8] mm, kasan: SLAB support

On Thu, Jan 28, 2016 at 02:29:42PM +0100, Alexander Potapenko wrote:
> On Thu, Jan 28, 2016 at 1:37 PM, Alexander Potapenko <glider@...gle.com> wrote:
> >
> > On Jan 28, 2016 8:44 AM, "Joonsoo Kim" <iamjoonsoo.kim@....com> wrote:
> >>
> >> On Wed, Jan 27, 2016 at 07:25:07PM +0100, Alexander Potapenko wrote:
> >> > This patch adds KASAN hooks to SLAB allocator.
> >> >
> >> > This patch is based on the "mm: kasan: unified support for SLUB and
> >> > SLAB allocators" patch originally prepared by Dmitry Chernenkov.
> >> >
> >> > Signed-off-by: Alexander Potapenko <glider@...gle.com>
> >> > ---
> >> >  Documentation/kasan.txt  |  5 ++-
> >>
> >> ...
> >>
> >> > +#ifdef CONFIG_SLAB
> >> > +struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
> >> > +                                     const void *object)
> >> > +{
> >> > +     return (void *)object + cache->kasan_info.alloc_meta_offset;
> >> > +}
> >> > +
> >> > +struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
> >> > +                                   const void *object)
> >> > +{
> >> > +     return (void *)object + cache->kasan_info.free_meta_offset;
> >> > +}
> >> > +#endif
> >>
> >> I cannot find the place to store stack info for free. get_free_info()
> >> isn't used except print_object(). Plese let me know where.
> >
> > This is covered by other patches in this patchset.

This should be covered by this patch. Stroing and printing free_info
is already done on SLUB and it is meaningful without quarantain.

Thanks.