From patchwork Wed Jun 23 13:35:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?WWVlIExlZSAo5p2O5bu66Kq8KQ==?= X-Patchwork-Id: 12339851 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=-17.0 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,MIME_BASE64_TEXT,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,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 D2242C4743C for ; Wed, 23 Jun 2021 13:36:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8064C61075 for ; Wed, 23 Jun 2021 13:36:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8064C61075 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5DF158D0001; Wed, 23 Jun 2021 09:36:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 58F4A6B0070; Wed, 23 Jun 2021 09:36:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 408D58D0001; Wed, 23 Jun 2021 09:36:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0117.hostedemail.com [216.40.44.117]) by kanga.kvack.org (Postfix) with ESMTP id 0FBB46B006C for ; Wed, 23 Jun 2021 09:36:01 -0400 (EDT) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 3EAA6180AD82F for ; Wed, 23 Jun 2021 13:36:01 +0000 (UTC) X-FDA: 78285086922.16.C560972 Received: from mailgw01.mediatek.com (mailgw01.mediatek.com [216.200.240.184]) by imf15.hostedemail.com (Postfix) with ESMTP id 4014DA002D57 for ; Wed, 23 Jun 2021 13:35:59 +0000 (UTC) X-UUID: f558436f6fa8477b9c597ced6620d25f-20210623 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=j7Ly1QQ9cVIZKTojMwqQxheF9osuhMIN7o324H9OuyU=; b=C1j8Nt9gBAR46h6RJGK1yRrIcKfqRosyEYjM6tOqiqlpHlFKZm9UwU7V1jZFL5iVZl/9hZ23EcemkIxUdzSX61prrnnR8cW7En2OZipB8Q/LwR/iEZHGTH51tG03wsrE02F93NPT4l08YlU2eFrLeJopowQwvRpZyaRjEW3LkWE=; X-UUID: f558436f6fa8477b9c597ced6620d25f-20210623 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1580966004; Wed, 23 Jun 2021 06:35:49 -0700 Received: from MTKMBS01N1.mediatek.inc (172.21.101.68) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 23 Jun 2021 06:35:47 -0700 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 23 Jun 2021 21:35:40 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 23 Jun 2021 21:35:40 +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: Wed, 23 Jun 2021 21:35:32 +0800 Message-ID: <20210623133533.2246-2-yee.lee@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20210623133533.2246-1-yee.lee@mediatek.com> References: <20210623133533.2246-1-yee.lee@mediatek.com> MIME-Version: 1.0 X-MTK: N X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 4014DA002D57 X-Stat-Signature: f96ezu1zz8tj1rjc3dha3mnrqkanneqg Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=mediatek.com header.s=dk header.b=C1j8Nt9g; dmarc=pass (policy=none) header.from=mediatek.com; spf=pass (imf15.hostedemail.com: domain of yee.lee@mediatek.com designates 216.200.240.184 as permitted sender) smtp.mailfrom=yee.lee@mediatek.com X-HE-Tag: 1624455359-422395 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: From: Yee Lee Issue: when SLUB debug is on, hwtag kasan_unpoison() would overwrite the redzone with unaligned object size. An additional memzero_explicit() path is added to replacing hwtag initialization at SLUB deubg mode. Signed-off-by: Yee Lee Suggested-by: Marco Elver Cc: Andrey Ryabinin Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Dmitry Vyukov Cc: Andrew Morton --- mm/kasan/kasan.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index d8faa64614b7..e984a9ac814d 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -387,10 +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; - memset((void *)addr, 0, size); + memzero_explicit((void *)addr, size); } + #endif size = round_up(size, KASAN_GRANULE_SIZE); hw_set_mem_tag_range((void *)addr, size, tag, init); }