From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8B20C433E6 for ; Mon, 1 Feb 2021 19:43:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 451DD64EA9 for ; Mon, 1 Feb 2021 19:43:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 451DD64EA9 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C5F2C6B0073; Mon, 1 Feb 2021 14:43:44 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C111C6B0074; Mon, 1 Feb 2021 14:43:44 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AB1BA6B0078; Mon, 1 Feb 2021 14:43:44 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0008.hostedemail.com [216.40.44.8]) by kanga.kvack.org (Postfix) with ESMTP id 8F9086B0073 for ; Mon, 1 Feb 2021 14:43:44 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 5063918000BEA for ; Mon, 1 Feb 2021 19:43:44 +0000 (UTC) X-FDA: 77770723968.01.sign78_0a15c64275c4 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id 2D39710046465 for ; Mon, 1 Feb 2021 19:43:44 +0000 (UTC) X-HE-Tag: sign78_0a15c64275c4 X-Filterd-Recvd-Size: 8123 Received: from mail-wr1-f73.google.com (mail-wr1-f73.google.com [209.85.221.73]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Mon, 1 Feb 2021 19:43:43 +0000 (UTC) Received: by mail-wr1-f73.google.com with SMTP id n14so11067928wru.6 for ; Mon, 01 Feb 2021 11:43:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=xUtTTHPe7DRCgRtwSi+4scq+pNy2/ibyykEGsvZRuk0=; b=e176a67fK1UTibZXT++SH5zHy4zoNchdCjdpLCcct5knc2liGlNDF3Yamqdq+stmzY UD1Pf4fnW56aHo0VWMIdu0X7NSh9tglx3uCnpOggFaqp7pk/zA0jLS91Vw8jJ1oBwAbv ZdfBExGNllbfqfRyNbp+stdcka9VoQV4HuCvyYKhFs4zFM3kQb0iNgSNATnD3q8SQnlS bo94eGEJb9nNfzLhllE6oILm36yWPrzsRKbNhMrwH4R+PLCtzzlDsNrAtHgIeRJqSKJ7 KKt7zUyIWygctX6LyJdzJWWpJMrEjfTNbfEc77Ex501VCB2gl3GBeZo2AsAuv/+hTAsk ImoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=xUtTTHPe7DRCgRtwSi+4scq+pNy2/ibyykEGsvZRuk0=; b=RcsRFbfiUMNoJy1nwx8NYS2hyCSPh945EEmN28EGoVwasuUcC6Vsr+Xw4E3YRXRiyb axax/DkjsZ9vHp5FZXHKCnPe23CPoHDlunqpAXEHn/qOCfMYqn6cIeAhiaEHCq+bxZFX LSkhl8/IkqZ9Na3L4o2hN6q4gR+UhBgb2P4r85JPcZSxSoJCRPelWqxXVhoQzuOhqAUJ xyJj7vKOML1FbAyYIEVyaBq5lucwgDM2Tg0QDo1waOr/R59tjSMj3lalu3yM9p3pg5mr A/9mDMid36CsiM30wOCnTi+axPcl3bsF6wvrBfhcVY4qx+a9OvlocMgqoW3Lxdkl+607 PTOQ== X-Gm-Message-State: AOAM532nh/Mf9qsMQtQDjP5A9giXq7eLpe7lm8xMYaBNTPqGf3pEwljF FOJBKBAnf4UJdrvgq+/ztCGQu5zZWVbEjq2j X-Google-Smtp-Source: ABdhPJw8tIfQ1xoMxW7zeobkrkFUwn4wKnbjCuC6YkGhqiO0pJ6PYdc4Nfm8BLCkJlGJR9HYDF5LqYLdtDMXC9jx X-Received: from andreyknvl3.muc.corp.google.com ([2a00:79e0:15:13:7220:84ff:fe09:7e9d]) (user=andreyknvl job=sendgmr) by 2002:a1c:8109:: with SMTP id c9mr380514wmd.137.1612208622386; Mon, 01 Feb 2021 11:43:42 -0800 (PST) Date: Mon, 1 Feb 2021 20:43:25 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH 01/12] kasan, mm: don't save alloc stacks twice From: Andrey Konovalov To: Catalin Marinas , Vincenzo Frascino , Dmitry Vyukov , Alexander Potapenko , Marco Elver Cc: Andrew Morton , Will Deacon , Andrey Ryabinin , Peter Collingbourne , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Currently KASAN saves allocation stacks in both kasan_slab_alloc() and kasan_kmalloc() annotations. This patch changes KASAN to save allocation stacks for slab objects from kmalloc caches in kasan_kmalloc() only, and stacks for other slab objects in kasan_slab_alloc() only. This change requires ____kasan_kmalloc() knowing whether the object belongs to a kmalloc cache. This is implemented by adding a flag field to the kasan_info structure. That flag is only set for kmalloc caches via a new kasan_cache_create_kmalloc() annotation. Signed-off-by: Andrey Konovalov --- include/linux/kasan.h | 9 +++++++++ mm/kasan/common.c | 18 ++++++++++++++---- mm/slab_common.c | 1 + 3 files changed, 24 insertions(+), 4 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 6d8f3227c264..2d5de4092185 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -83,6 +83,7 @@ static inline void kasan_disable_current(void) {} struct kasan_cache { int alloc_meta_offset; int free_meta_offset; + bool is_kmalloc; }; #ifdef CONFIG_KASAN_HW_TAGS @@ -143,6 +144,13 @@ static __always_inline void kasan_cache_create(struct kmem_cache *cache, __kasan_cache_create(cache, size, flags); } +void __kasan_cache_create_kmalloc(struct kmem_cache *cache); +static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) +{ + if (kasan_enabled()) + __kasan_cache_create_kmalloc(cache); +} + size_t __kasan_metadata_size(struct kmem_cache *cache); static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache) { @@ -278,6 +286,7 @@ static inline void kasan_free_pages(struct page *page, unsigned int order) {} static inline void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, slab_flags_t *flags) {} +static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {} static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } static inline void kasan_poison_slab(struct page *page) {} static inline void kasan_unpoison_object_data(struct kmem_cache *cache, diff --git a/mm/kasan/common.c b/mm/kasan/common.c index fe852f3cfa42..374049564ea3 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -210,6 +210,11 @@ void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size, *size = optimal_size; } +void __kasan_cache_create_kmalloc(struct kmem_cache *cache) +{ + cache->kasan_info.is_kmalloc = true; +} + size_t __kasan_metadata_size(struct kmem_cache *cache) { if (!kasan_stack_collection_enabled()) @@ -394,17 +399,22 @@ void __kasan_slab_free_mempool(void *ptr, unsigned long ip) } } -static void set_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags) +static void set_alloc_info(struct kmem_cache *cache, void *object, + gfp_t flags, bool kmalloc) { struct kasan_alloc_meta *alloc_meta; + /* Don't save alloc info for kmalloc caches in kasan_slab_alloc(). */ + if (cache->kasan_info.is_kmalloc && !kmalloc) + return; + alloc_meta = kasan_get_alloc_meta(cache, object); if (alloc_meta) kasan_set_track(&alloc_meta->alloc_track, flags); } static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object, - size_t size, gfp_t flags, bool keep_tag) + size_t size, gfp_t flags, bool kmalloc) { unsigned long redzone_start; unsigned long redzone_end; @@ -423,7 +433,7 @@ static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object, KASAN_GRANULE_SIZE); redzone_end = round_up((unsigned long)object + cache->object_size, KASAN_GRANULE_SIZE); - tag = assign_tag(cache, object, false, keep_tag); + tag = assign_tag(cache, object, false, kmalloc); /* Tag is ignored in set_tag without CONFIG_KASAN_SW/HW_TAGS */ kasan_unpoison(set_tag(object, tag), size); @@ -431,7 +441,7 @@ static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object, KASAN_KMALLOC_REDZONE); if (kasan_stack_collection_enabled()) - set_alloc_info(cache, (void *)object, flags); + set_alloc_info(cache, (void *)object, flags, kmalloc); return set_tag(object, tag); } diff --git a/mm/slab_common.c b/mm/slab_common.c index 9aa3d2fe4c55..39d1a8ff9bb8 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -647,6 +647,7 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name, panic("Out of memory when creating slab %s\n", name); create_boot_cache(s, name, size, flags, useroffset, usersize); + kasan_cache_create_kmalloc(s); list_add(&s->list, &slab_caches); s->refcount = 1; return s; -- 2.30.0.365.g02bc693789-goog