From nobody Fri Dec 19 14:16:39 2025 Received: from out-189.mta1.migadu.com (out-189.mta1.migadu.com [95.215.58.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1C8C54CB34 for ; Tue, 19 Dec 2023 22:32:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="PVS7/Vp9" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1703025150; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=EPGVjwO+qP/d7FcuwPK2D6CcDKWjvT42oG4AsVrb0Go=; b=PVS7/Vp9rKcCStvahkmREEOMnuEX6kau1z/8KUeJ+M+L9oh0S/muURork3hPcDgoR/5lvV ReB2LpYutwX5p3c63FdFGnocPloJeeIBz+IrzYNEY41q/t2SiRz0dp5ZLm4EF8f/mEHnF3 IzsuSBbMxsPovIvvYoBbisxMLMXLZwo= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko Cc: Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, Evgenii Stepanov , Breno Leitao , Alexander Lobakin , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH mm 21/21] io_uring: use mempool KASAN hook Date: Tue, 19 Dec 2023 23:29:05 +0100 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: Andrey Konovalov Use the proper kasan_mempool_unpoison_object hook for unpoisoning cached objects. A future change might also update io_uring to check the return value of kasan_mempool_poison_object to prevent double-free and invalid-free bugs. This proves to be non-trivial with the current way io_uring caches objects, so this is left out-of-scope of this series. Signed-off-by: Andrey Konovalov --- io_uring/alloc_cache.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h index 8de0414e8efe..bf2fb26a6539 100644 --- a/io_uring/alloc_cache.h +++ b/io_uring/alloc_cache.h @@ -33,7 +33,7 @@ static inline struct io_cache_entry *io_alloc_cache_get(s= truct io_alloc_cache *c struct io_cache_entry *entry; =20 entry =3D container_of(cache->list.next, struct io_cache_entry, node); - kasan_unpoison_range(entry, cache->elem_size); + kasan_mempool_unpoison_object(entry, cache->elem_size); cache->list.next =3D cache->list.next->next; cache->nr_cached--; return entry; --=20 2.25.1