linux-kernel - Re: [PATCH v8 0/2] allow KASAN to detect UAF in SLAB_TYPESAFE_BY

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Message-ID: <20240809182746.GB25962@twin.jikos.cz>
Date: Fri, 9 Aug 2024 20:27:46 +0200
From: David Sterba <dsterba@...e.cz>
To: Jann Horn <jannh@...gle.com>
Cc: 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>,
	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>,
	Vlastimil Babka <vbabka@...e.cz>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>, Marco Elver <elver@...gle.com>,
	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, David Sterba <dsterba@...e.cz>,
	syzbot+263726e59eab6b442723@...kaller.appspotmail.com
Subject: Re: [PATCH v8 0/2] allow KASAN to detect UAF in SLAB_TYPESAFE_BY_RCU
 slabs

On Fri, Aug 09, 2024 at 05:36:54PM +0200, Jann Horn wrote:
> Changes in v8:
> - in patch 2/2:
>   - move rcu_barrier() out of locked region (vbabka)
>   - rearrange code in slab_free_after_rcu_debug (vbabka)
> - Link to v7: https://lore.kernel.org/r/20240808-kasan-tsbrcu-v7-0-0d0590c54ae6@google.com
> 
> Changes in v7:
> - in patch 2/2:
>   - clarify kconfig comment (Marco)
>   - fix memory leak (vbabka and dsterba)

FWIW, I've retested v7 and got no OOM (caused by the leak), on KASAN,
KFENCE and other debugging options enabled.