From nobody Wed Dec 31 08:52:04 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C11B3C4167B for ; Mon, 6 Nov 2023 20:14:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233152AbjKFUOe (ORCPT ); Mon, 6 Nov 2023 15:14:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233151AbjKFUON (ORCPT ); Mon, 6 Nov 2023 15:14:13 -0500 Received: from out-172.mta0.migadu.com (out-172.mta0.migadu.com [91.218.175.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 33275198D for ; Mon, 6 Nov 2023 12:13:53 -0800 (PST) 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=1699301631; 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=VvwPI2keLXzkzqlZ3FnvGVKGg5TiKAVIbhEfe4q4zBpcT7eCPN3B9NQON+ibMnBGElwnGf eWdKn2N728sPwjXJ2GuPBYYG5XnlY5BH2yy4FnLjIp2Sa6KToE0S7E2SFjTIoYB0IY5KEk KahIGvyWN2K+2fQ0a2nUKxfLXrFjdms= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko Cc: Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, Evgenii Stepanov , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH RFC 20/20] io_uring: use mempool KASAN hook Date: Mon, 6 Nov 2023 21:10:29 +0100 Message-Id: <4f2fc546ce7b494c99c08e282c4d697d6dd58a8f.1699297309.git.andreyknvl@google.com> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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