From nobody Tue Dec 30 18:49:28 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 68247C4332F for ; Mon, 13 Nov 2023 19:14:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231838AbjKMTOT (ORCPT ); Mon, 13 Nov 2023 14:14:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230141AbjKMTOP (ORCPT ); Mon, 13 Nov 2023 14:14:15 -0500 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A0D710E5; Mon, 13 Nov 2023 11:14:11 -0800 (PST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 0504B21906; Mon, 13 Nov 2023 19:14:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1699902850; h=from:from:reply-to: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=sRrsgxJwat5NXRr1zzXEwT9soXXRRzcekV8Be8tRJ7Y=; b=X7VVhHyLuw5jRZn5p6oH6ejSLGgR3WPVlTm60bL6sWdiNYHztbNOQXsqe9CFMWqTmaZ3AY D2x+osw9tXWkHMxDHk30QEXQfKJLix4xQsfkUN57u8I8L/5+BSQ9CHWn98tBc06/T/FD45 7mYBlBSp0TXagVjFeR2CGXtvDAN6tDE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1699902850; h=from:from:reply-to: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=sRrsgxJwat5NXRr1zzXEwT9soXXRRzcekV8Be8tRJ7Y=; b=zRCPFoeZ2GTmsf6m0d+7i1K/BRLZjeTx5IgmKVyhLF3sum1/TSGRYltQYoISNmy/QPsNek wpyEGHbfsfHhT1AQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id A64FA13398; Mon, 13 Nov 2023 19:14:09 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 6DkBKIF1UmVFOgAAMHmgww (envelope-from ); Mon, 13 Nov 2023 19:14:09 +0000 From: Vlastimil Babka To: David Rientjes , Christoph Lameter , Pekka Enberg , Joonsoo Kim Cc: Andrew Morton , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Marco Elver , Johannes Weiner , Michal Hocko , Shakeel Butt , Muchun Song , Kees Cook , kasan-dev@googlegroups.com, cgroups@vger.kernel.org, Vlastimil Babka Subject: [PATCH 02/20] KASAN: remove code paths guarded by CONFIG_SLAB Date: Mon, 13 Nov 2023 20:13:43 +0100 Message-ID: <20231113191340.17482-24-vbabka@suse.cz> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231113191340.17482-22-vbabka@suse.cz> References: <20231113191340.17482-22-vbabka@suse.cz> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" With SLAB removed and SLUB the only remaining allocator, we can clean up some code that was depending on the choice. Signed-off-by: Vlastimil Babka Reviewed-by: Kees Cook Reviewed-by: Marco Elver --- mm/kasan/common.c | 13 ++----------- mm/kasan/kasan.h | 3 +-- mm/kasan/quarantine.c | 7 ------- 3 files changed, 3 insertions(+), 20 deletions(-) diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 256930da578a..5d95219e69d7 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -153,10 +153,6 @@ void __kasan_poison_object_data(struct kmem_cache *cac= he, void *object) * 2. A cache might be SLAB_TYPESAFE_BY_RCU, which means objects can be * accessed after being freed. We preassign tags for objects in these * caches as well. - * 3. For SLAB allocator we can't preassign tags randomly since the freeli= st - * is stored as an array of indexes instead of a linked list. Assign ta= gs - * based on objects indexes, so that objects that are next to each other - * get different tags. */ static inline u8 assign_tag(struct kmem_cache *cache, const void *object, bool init) @@ -171,17 +167,12 @@ static inline u8 assign_tag(struct kmem_cache *cache, if (!cache->ctor && !(cache->flags & SLAB_TYPESAFE_BY_RCU)) return init ? KASAN_TAG_KERNEL : kasan_random_tag(); =20 - /* For caches that either have a constructor or SLAB_TYPESAFE_BY_RCU: */ -#ifdef CONFIG_SLAB - /* For SLAB assign tags based on the object index in the freelist. */ - return (u8)obj_to_index(cache, virt_to_slab(object), (void *)object); -#else /* - * For SLUB assign a random tag during slab creation, otherwise reuse + * For caches that either have a constructor or SLAB_TYPESAFE_BY_RCU, + * assign a random tag during slab creation, otherwise reuse * the already assigned tag. */ return init ? kasan_random_tag() : get_tag(object); -#endif } =20 void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache, diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 8b06bab5c406..eef50233640a 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -373,8 +373,7 @@ void kasan_set_track(struct kasan_track *track, gfp_t f= lags); void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t f= lags); void kasan_save_free_info(struct kmem_cache *cache, void *object); =20 -#if defined(CONFIG_KASAN_GENERIC) && \ - (defined(CONFIG_SLAB) || defined(CONFIG_SLUB)) +#ifdef CONFIG_KASAN_GENERIC bool kasan_quarantine_put(struct kmem_cache *cache, void *object); void kasan_quarantine_reduce(void); void kasan_quarantine_remove_cache(struct kmem_cache *cache); 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, struc= t kmem_cache *cache) { void *object =3D qlink_to_object(qlink, cache); struct kasan_free_meta *meta =3D kasan_get_free_meta(cache, object); - unsigned long flags; - - if (IS_ENABLED(CONFIG_SLAB)) - local_irq_save(flags); =20 /* * 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) =3D KASAN_SLAB_FREE; =20 ___cache_free(cache, object, _THIS_IP_); - - if (IS_ENABLED(CONFIG_SLAB)) - local_irq_restore(flags); } =20 static void qlist_free_all(struct qlist_head *q, struct kmem_cache *cache) --=20 2.42.1