From nobody Wed Dec 31 08:32:42 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 22A36C4332F for ; Mon, 6 Nov 2023 20:10:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232939AbjKFUKx (ORCPT ); Mon, 6 Nov 2023 15:10:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232918AbjKFUKl (ORCPT ); Mon, 6 Nov 2023 15:10:41 -0500 Received: from out-171.mta1.migadu.com (out-171.mta1.migadu.com [95.215.58.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83FB0D7D for ; Mon, 6 Nov 2023 12:10:36 -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=1699301435; 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=t/Tz91brdE21dTNWs0et2BZxKBCaFAccIIB/OCqkFS0=; b=aaX6KV+UWkGgoc/tFbUJHDU1fecvP/ug5k2WlsFn/kBP4/GWVGypJrvpu3Uccqw9G1op6n rqju0no4iU0SSp8Rg71WkOaGPzeamqnNgb+RhCgZ6NsdAvgl7d/PZXBvDZBn2USk1I6Xh7 af1WOsyuVc57E+UwVLOlLz3OCEp+fkY= 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 02/20] kasan: move kasan_mempool_poison_object Date: Mon, 6 Nov 2023 21:10:11 +0100 Message-Id: <8bf615539d11dba005e01a65267be1c0298887bc.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 Move kasan_mempool_poison_object after all slab-related KASAN hooks. This is a preparatory change for the following patches in this series. No functional changes. Signed-off-by: Andrey Konovalov --- include/linux/kasan.h | 16 +++++++-------- mm/kasan/common.c | 46 +++++++++++++++++++++---------------------- 2 files changed, 31 insertions(+), 31 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 6310435f528b..0d1f925c136d 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -172,13 +172,6 @@ static __always_inline void kasan_kfree_large(void *pt= r) __kasan_kfree_large(ptr, _RET_IP_); } =20 -void __kasan_mempool_poison_object(void *ptr, unsigned long ip); -static __always_inline void kasan_mempool_poison_object(void *ptr) -{ - if (kasan_enabled()) - __kasan_mempool_poison_object(ptr, _RET_IP_); -} - void * __must_check __kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags, bool init); static __always_inline void * __must_check kasan_slab_alloc( @@ -219,6 +212,13 @@ static __always_inline void * __must_check kasan_kreal= loc(const void *object, return (void *)object; } =20 +void __kasan_mempool_poison_object(void *ptr, unsigned long ip); +static __always_inline void kasan_mempool_poison_object(void *ptr) +{ + if (kasan_enabled()) + __kasan_mempool_poison_object(ptr, _RET_IP_); +} + /* * Unlike kasan_check_read/write(), kasan_check_byte() is performed even f= or * the hardware tag-based mode that doesn't rely on compiler instrumentati= on. @@ -256,7 +256,6 @@ static inline bool kasan_slab_free(struct kmem_cache *s= , void *object, bool init return false; } static inline void kasan_kfree_large(void *ptr) {} -static inline void kasan_mempool_poison_object(void *ptr) {} static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags, bool init) { @@ -276,6 +275,7 @@ static inline void *kasan_krealloc(const void *object, = size_t new_size, { return (void *)object; } +static inline void kasan_mempool_poison_object(void *ptr) {} static inline bool kasan_check_byte(const void *address) { return true; diff --git a/mm/kasan/common.c b/mm/kasan/common.c index e42d6f349ae2..69f4c66f0da3 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -272,29 +272,6 @@ void __kasan_kfree_large(void *ptr, unsigned long ip) ____kasan_kfree_large(ptr, ip); } =20 -void __kasan_mempool_poison_object(void *ptr, unsigned long ip) -{ - struct folio *folio; - - folio =3D virt_to_folio(ptr); - - /* - * Even though this function is only called for kmem_cache_alloc and - * kmalloc backed mempool allocations, those allocations can still be - * !PageSlab() when the size provided to kmalloc is larger than - * KMALLOC_MAX_SIZE, and kmalloc falls back onto page_alloc. - */ - if (unlikely(!folio_test_slab(folio))) { - if (____kasan_kfree_large(ptr, ip)) - return; - kasan_poison(ptr, folio_size(folio), KASAN_PAGE_FREE, false); - } else { - struct slab *slab =3D folio_slab(folio); - - ____kasan_slab_free(slab->slab_cache, ptr, ip, false, false); - } -} - void * __must_check __kasan_slab_alloc(struct kmem_cache *cache, void *object, gfp_t flags, bool init) { @@ -442,6 +419,29 @@ void * __must_check __kasan_krealloc(const void *objec= t, size_t size, gfp_t flag return ____kasan_kmalloc(slab->slab_cache, object, size, flags); } =20 +void __kasan_mempool_poison_object(void *ptr, unsigned long ip) +{ + struct folio *folio; + + folio =3D virt_to_folio(ptr); + + /* + * Even though this function is only called for kmem_cache_alloc and + * kmalloc backed mempool allocations, those allocations can still be + * !PageSlab() when the size provided to kmalloc is larger than + * KMALLOC_MAX_SIZE, and kmalloc falls back onto page_alloc. + */ + if (unlikely(!folio_test_slab(folio))) { + if (____kasan_kfree_large(ptr, ip)) + return; + kasan_poison(ptr, folio_size(folio), KASAN_PAGE_FREE, false); + } else { + struct slab *slab =3D folio_slab(folio); + + ____kasan_slab_free(slab->slab_cache, ptr, ip, false, false); + } +} + bool __kasan_check_byte(const void *address, unsigned long ip) { if (!kasan_byte_accessible(address)) { --=20 2.25.1