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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 B6E94C3526B for ; Fri, 18 Dec 2020 22:05:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8ADC723BAB for ; Fri, 18 Dec 2020 22:05:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726483AbgLRWFw (ORCPT ); Fri, 18 Dec 2020 17:05:52 -0500 Received: from mail.kernel.org ([198.145.29.99]:39544 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726504AbgLRWFv (ORCPT ); Fri, 18 Dec 2020 17:05:51 -0500 Date: Fri, 18 Dec 2020 14:05:10 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1608329111; bh=DHvmhn7Z9vTJP2KW1DOx07RPN/cMcwd6mWA3WswqlMQ=; h=From:To:Subject:In-Reply-To:From; b=GMFDQOkosCB9Wvu/VEi/44DJZRyXSi2pHf4YN8KiQhrJSv8gO7IYukf7NNmoZahql DBikFuGQlR9SG5NLnc0lrcRjvrcl2wfJYC7y13FOEnBORQzu7iJMy/S0EeJsQf2pBP t/I14R+i5IdDPIKQ5Fp8ilAO3uVqaSxbxhHvzR5Y= From: Andrew Morton To: akpm@linux-foundation.org, andreyknvl@google.com, aryabinin@virtuozzo.com, Branislav.Rankov@arm.com, catalin.marinas@arm.com, dvyukov@google.com, elver@google.com, eugenis@google.com, glider@google.com, gor@linux.ibm.com, kevin.brodsky@arm.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, vincenzo.frascino@arm.com, will.deacon@arm.com Subject: [patch 68/78] kasan: don't round_up too much Message-ID: <20201218220510.q8idAv5xN%akpm@linux-foundation.org> In-Reply-To: <20201218140046.497484741326828e5b5d46ec@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Andrey Konovalov Subject: kasan: don't round_up too much For hardware tag-based mode kasan_poison_memory() already rounds up the size. Do the same for software modes and remove round_up() from the common code. Link: https://lkml.kernel.org/r/47b232474f1f89dc072aeda0fa58daa6efade377.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ib397128fac6eba874008662b4964d65352db4aa4 Signed-off-by: Andrey Konovalov Reviewed-by: Dmitry Vyukov Reviewed-by: Marco Elver Tested-by: Vincenzo Frascino Cc: Alexander Potapenko Cc: Andrey Ryabinin Cc: Branislav Rankov Cc: Catalin Marinas Cc: Evgenii Stepanov Cc: Kevin Brodsky Cc: Vasily Gorbik Cc: Will Deacon Signed-off-by: Andrew Morton --- mm/kasan/common.c | 8 ++------ mm/kasan/shadow.c | 1 + 2 files changed, 3 insertions(+), 6 deletions(-) --- a/mm/kasan/common.c~kasan-dont-round_up-too-much +++ a/mm/kasan/common.c @@ -213,9 +213,7 @@ void __kasan_unpoison_object_data(struct void __kasan_poison_object_data(struct kmem_cache *cache, void *object) { - poison_range(object, - round_up(cache->object_size, KASAN_GRANULE_SIZE), - KASAN_KMALLOC_REDZONE); + poison_range(object, cache->object_size, KASAN_KMALLOC_REDZONE); } /* @@ -288,7 +286,6 @@ static bool ____kasan_slab_free(struct k { u8 tag; void *tagged_object; - unsigned long rounded_up_size; tag = get_tag(object); tagged_object = object; @@ -309,8 +306,7 @@ static bool ____kasan_slab_free(struct k return true; } - rounded_up_size = round_up(cache->object_size, KASAN_GRANULE_SIZE); - poison_range(object, rounded_up_size, KASAN_KMALLOC_FREE); + poison_range(object, cache->object_size, KASAN_KMALLOC_FREE); if (!kasan_stack_collection_enabled()) return false; --- a/mm/kasan/shadow.c~kasan-dont-round_up-too-much +++ a/mm/kasan/shadow.c @@ -83,6 +83,7 @@ void poison_range(const void *address, s * addresses to this function. */ address = kasan_reset_tag(address); + size = round_up(size, KASAN_GRANULE_SIZE); /* Skip KFENCE memory if called explicitly outside of sl*b. */ if (is_kfence_address(address)) _