linux-kernel - Re: [PATCH] slab: store tagged freelist for off-slab slabmgmt

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Message-ID: <CAAeHK+wB4L9nj+iPf8iHUbuWBCE_FQN4aea4zswEd4bbr49FPQ@mail.gmail.com>
Date:   Wed, 3 Apr 2019 18:39:30 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Qian Cai <cai@....pw>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] slab: store tagged freelist for off-slab slabmgmt

On Wed, Apr 3, 2019 at 3:07 PM Qian Cai <cai@....pw> wrote:
>
> On Wed, 2019-04-03 at 13:23 +0200, Andrey Konovalov wrote:
> > On Wed, Apr 3, 2019 at 4:29 AM Qian Cai <cai@....pw> wrote:
> > >
> > > The commit 51dedad06b5f ("kasan, slab: make freelist stored without
> > > tags") calls kasan_reset_tag() for off-slab slab management object
> > > leading to freelist being stored non-tagged. However, cache_grow_begin()
> > > -> alloc_slabmgmt() -> kmem_cache_alloc_node() which assigns a tag for
> > > the address and stores in the shadow address. As the result, it causes
> > > endless errors below during boot due to drain_freelist() ->
> > > slab_destroy() -> kasan_slab_free() which compares already untagged
> > > freelist against the stored tag in the shadow address. Since off-slab
> > > slab management object freelist is such a special case, so just store it
> > > tagged. Non-off-slab management object freelist is still stored untagged
> > > which has not been assigned a tag and should not cause any other
> > > troubles with this inconsistency.
> >
> > Hi Qian,
> >
> > Could you share the config (or other steps) you used to reproduce this?
>
> https://git.sr.ht/~cai/linux-debug/blob/master/config
>
> Additional command-line option to boot:
>
> page_poison=on crashkernel=768M earlycon page_owner=on numa_balancing=enable
> systemd.unified_cgroup_hierarchy=1 debug_guardpage_minorder=1

Reproduced, thanks!

As far as my understanding of how SLAB works goes, this change looks good to me.

Reviewed-by: Andrey Konovalov <andreyknvl@...gle.com>

Thanks, Qian!

>
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