linux-hardening - Re: [PATCH v2 03/21] KASAN: remove code paths guarded by CONFIG

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Date: Tue, 21 Nov 2023 17:23:17 +0900
From: Hyeonggon Yoo <42.hyeyoo@...il.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: David Rientjes <rientjes@...gle.com>, Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, 
	Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Andrey Ryabinin <ryabinin.a.a@...il.com>, 
	Alexander Potapenko <glider@...gle.com>, Andrey Konovalov <andreyknvl@...il.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, Vincenzo Frascino <vincenzo.frascino@....com>, 
	Marco Elver <elver@...gle.com>, Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>, 
	Shakeel Butt <shakeelb@...gle.com>, Muchun Song <muchun.song@...ux.dev>, 
	Kees Cook <keescook@...omium.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	kasan-dev@...glegroups.com, cgroups@...r.kernel.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 03/21] KASAN: remove code paths guarded by CONFIG_SLAB

On Tue, Nov 21, 2023 at 3:34 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> With SLAB removed and SLUB the only remaining allocator, we can clean up
> some code that was depending on the choice.
>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: Marco Elver <elver@...gle.com>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---

[...]

> diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
> index ca4529156735..138c57b836f2 100644
> --- a/mm/kasan/quarantine.c
> +++ b/mm/kasan/quarantine.c
> @@ -144,10 +144,6 @@ static void qlink_free(struct qlist_node *qlink, struct kmem_cache *cache)
>  {
>         void *object = qlink_to_object(qlink, cache);
>         struct kasan_free_meta *meta = kasan_get_free_meta(cache, object);
> -       unsigned long flags;
> -
> -       if (IS_ENABLED(CONFIG_SLAB))
> -               local_irq_save(flags);
>
>         /*
>          * If init_on_free is enabled and KASAN's free metadata is stored in
> @@ -166,9 +162,6 @@ static void qlink_free(struct qlist_node *qlink, struct kmem_cache *cache)
>         *(u8 *)kasan_mem_to_shadow(object) = KASAN_SLAB_FREE;
>
>         ___cache_free(cache, object, _THIS_IP_);
> -
> -       if (IS_ENABLED(CONFIG_SLAB))
> -               local_irq_restore(flags);
>  }

FYI there's a slight conflict (easy to resolve, though) when I tried
to merge this on top of linux-next,
due to a recent change in KASAN:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=0e8b630f3053f0ff84b7c3ab8ff98a7393863824

Thanks,
Hyeonggon