From patchwork Thu Dec 6 12:24:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10715799 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8DBA617DB for ; Thu, 6 Dec 2018 12:25:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7D29E292C8 for ; Thu, 6 Dec 2018 12:25:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 711B72D393; Thu, 6 Dec 2018 12:25:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F2519297D0 for ; Thu, 6 Dec 2018 12:25:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729830AbeLFMZ1 (ORCPT ); Thu, 6 Dec 2018 07:25:27 -0500 Received: from mail-wr1-f51.google.com ([209.85.221.51]:39484 "EHLO mail-wr1-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729631AbeLFMZ0 (ORCPT ); Thu, 6 Dec 2018 07:25:26 -0500 Received: by mail-wr1-f51.google.com with SMTP id t27so292037wra.6 for ; Thu, 06 Dec 2018 04:25:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=AZfZTLqWsknIvYMLnZdolPQtd9B+6yIRrKwPZ48RLc4=; b=EW/3SMqpcTiMhWNm2orG3EvbNyLZ48vaZIbUCv4K7/oj7HRZ9uPY1RH0eYr1rAgVW0 jyMP2dxynkJIJWAOyFDrXOO+bxX/RQl8Uyo6CKjDuuK1f5Yt+om29IOR4qfuWKYTdBa6 HSbK7N4y6Wq1gjNxQBTGM2y0gddfv8BnrSJP27jRBzimexVneU2mKh133NTPYQ2fqCvG CPhOs/+CryNsf6lHjyX+rz5v7pe0z3I5TS14++RGHvLCAQL4JcZIvyC/7qVGdYVi9+AZ yENfqxMnbM8uAyVl4QWMFZDJgy1UENGmTQUl26yxkghXpslYWoLlLUoaBcjn9yfCweYI TAWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=AZfZTLqWsknIvYMLnZdolPQtd9B+6yIRrKwPZ48RLc4=; b=kmnppuk1Rdl/bfy4IT5OXVfDZ3HngwA52YiXO2qP7zy0Ip8+7UTxsbGzgGgn7qZU6H AKpifHc8cInItMHIqhTr5GAv7Dq9dEypnU0+FBLzQMsCPODovTKCmhDIEwmVrcJZXOpL U6QNZaqZxqt5KI0TSx2fACAB/X6CIEe2w8zwdIrrF81fFzF4VEaATST8fqlnYHnBDsvC uXf9P1FyVCkoeo0JNlss0OxZRXbU3RAt9NhkujEnfrl+a00zLuqtQ1iI8qLWn00Cc1t9 xURzsNKBF2eKJfyFbRaRIiH8HJDk3W3DzyPMCU7OT7r5P+g/c06OJ04KfalQCxGdiPvz j5Rg== X-Gm-Message-State: AA+aEWasf3PQDvs0dp1tyNq9ywDxYsBWMGNqx0vGFaof8mCHngDRdpZE O6lAFqZ7LH48fuY1nevl3icQeg== X-Google-Smtp-Source: AFSGD/W3yTLYMQBOaLzTZ5SXjxjDat4MU8wRZ1yiVk7CrJyHq5HLrO5lLxvOMClpJkkFYNGGBhGn+A== X-Received: by 2002:adf:f8d2:: with SMTP id f18mr20884354wrq.265.1544099124211; Thu, 06 Dec 2018 04:25:24 -0800 (PST) Received: from andreyknvl0.muc.corp.google.com ([2a00:79e0:15:10:3180:41f8:3010:ff61]) by smtp.gmail.com with ESMTPSA id j8sm339988wrt.40.2018.12.06.04.25.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 06 Dec 2018 04:25:23 -0800 (PST) From: Andrey Konovalov To: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Catalin Marinas , Will Deacon , Christoph Lameter , Andrew Morton , Mark Rutland , Nick Desaulniers , Marc Zyngier , Dave Martin , Ard Biesheuvel , "Eric W . Biederman" , Ingo Molnar , Paul Lawrence , Geert Uytterhoeven , Arnd Bergmann , "Kirill A . Shutemov" , Greg Kroah-Hartman , Kate Stewart , Mike Rapoport , kasan-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sparse@vger.kernel.org, linux-mm@kvack.org, linux-kbuild@vger.kernel.org Cc: Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Jann Horn , Mark Brand , Chintan Pandya , Vishwath Mohan , Andrey Konovalov Subject: [PATCH v13 22/25] kasan: add __must_check annotations to kasan hooks Date: Thu, 6 Dec 2018 13:24:40 +0100 Message-Id: <03b269c5e453945f724bfca3159d4e1333a8fb1c.1544099024.git.andreyknvl@google.com> X-Mailer: git-send-email 2.20.0.rc1.387.gf8505762e3-goog In-Reply-To: References: MIME-Version: 1.0 Sender: linux-sparse-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sparse@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds __must_check annotations to kasan hooks that return a pointer to make sure that a tagged pointer always gets propagated. Suggested-by: Andrey Ryabinin Signed-off-by: Andrey Konovalov --- include/linux/kasan.h | 16 ++++++++++------ mm/kasan/common.c | 15 +++++++++------ 2 files changed, 19 insertions(+), 12 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 8da7b7a4397a..b40ea104dd36 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -49,16 +49,20 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, void kasan_poison_slab(struct page *page); void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); void kasan_poison_object_data(struct kmem_cache *cache, void *object); -void *kasan_init_slab_obj(struct kmem_cache *cache, const void *object); +void * __must_check kasan_init_slab_obj(struct kmem_cache *cache, + const void *object); -void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); +void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, + gfp_t flags); void kasan_kfree_large(void *ptr, unsigned long ip); void kasan_poison_kfree(void *ptr, unsigned long ip); -void *kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, - gfp_t flags); -void *kasan_krealloc(const void *object, size_t new_size, gfp_t flags); +void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object, + size_t size, gfp_t flags); +void * __must_check kasan_krealloc(const void *object, size_t new_size, + gfp_t flags); -void *kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); +void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object, + gfp_t flags); bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip); struct kasan_cache { diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 195ca385cf7a..1144e741feb6 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -373,7 +373,8 @@ static u8 assign_tag(struct kmem_cache *cache, const void *object, bool new) #endif } -void *kasan_init_slab_obj(struct kmem_cache *cache, const void *object) +void * __must_check kasan_init_slab_obj(struct kmem_cache *cache, + const void *object) { struct kasan_alloc_meta *alloc_info; @@ -389,7 +390,8 @@ void *kasan_init_slab_obj(struct kmem_cache *cache, const void *object) return (void *)object; } -void *kasan_slab_alloc(struct kmem_cache *cache, void *object, gfp_t flags) +void * __must_check kasan_slab_alloc(struct kmem_cache *cache, void *object, + gfp_t flags) { return kasan_kmalloc(cache, object, cache->object_size, flags); } @@ -449,8 +451,8 @@ bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip) return __kasan_slab_free(cache, object, ip, true); } -void *kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size, - gfp_t flags) +void * __must_check kasan_kmalloc(struct kmem_cache *cache, const void *object, + size_t size, gfp_t flags) { unsigned long redzone_start; unsigned long redzone_end; @@ -482,7 +484,8 @@ void *kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size, } EXPORT_SYMBOL(kasan_kmalloc); -void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) +void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, + gfp_t flags) { struct page *page; unsigned long redzone_start; @@ -506,7 +509,7 @@ void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) return (void *)ptr; } -void *kasan_krealloc(const void *object, size_t size, gfp_t flags) +void * __must_check kasan_krealloc(const void *object, size_t size, gfp_t flags) { struct page *page;