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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, 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 5FE79C48BDF for ; Thu, 24 Jun 2021 11:27:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46C72613CE for ; Thu, 24 Jun 2021 11:27:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232450AbhFXL3R (ORCPT ); Thu, 24 Jun 2021 07:29:17 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:50802 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S232274AbhFXL3Q (ORCPT ); Thu, 24 Jun 2021 07:29:16 -0400 X-UUID: 0ce6463091c0444ab97f96ae2ebd7c3d-20210624 X-UUID: 0ce6463091c0444ab97f96ae2ebd7c3d-20210624 Received: from mtkcas07.mediatek.inc [(172.21.101.84)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 967540757; Thu, 24 Jun 2021 19:26:54 +0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 24 Jun 2021 19:26:53 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 24 Jun 2021 19:26:53 +0800 From: To: CC: , Yee Lee , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Andrew Morton , Matthias Brugger , "open list:KASAN" , "open list:MEMORY MANAGEMENT" , open list , "moderated list:ARM/Mediatek SoC support" , "moderated list:ARM/Mediatek SoC support" Subject: [PATCH v2 1/1] kasan: Add memzero init for unaligned size under SLUB debug Date: Thu, 24 Jun 2021 19:26:21 +0800 Message-ID: <20210624112624.31215-2-yee.lee@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20210624112624.31215-1-yee.lee@mediatek.com> References: <20210624112624.31215-1-yee.lee@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yee Lee Issue: when SLUB debug is on, hwtag kasan_unpoison() would overwrite the redzone of object with unaligned size. An additional memzero_explicit() path is added to replacing init by hwtag instruction for those unaligned size at SLUB debug mode. Signed-off-by: Yee Lee --- mm/kasan/kasan.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 8f450bc28045..d1054f35838f 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -387,6 +387,12 @@ static inline void kasan_unpoison(const void *addr, size_t size, bool init) if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) return; +#if IS_ENABLED(CONFIG_SLUB_DEBUG) + if (init && ((unsigned long)size & KASAN_GRANULE_MASK)) { + init = false; + memzero_explicit((void *)addr, size); + } +#endif size = round_up(size, KASAN_GRANULE_SIZE); hw_set_mem_tag_range((void *)addr, size, tag, init); -- 2.18.0