From patchwork Mon May 11 02:32:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Walter Wu X-Patchwork-Id: 11539637 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1A3E9139A for ; Mon, 11 May 2020 02:34:14 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EAB2B208CA for ; Mon, 11 May 2020 02:34:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="D0TGfa5j"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="RCuxbCE7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EAB2B208CA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=9TtohAvtzEeAadJ2FaULvUt2b5457sKNruNMJQXQLqo=; b=D0TGfa5j39Sy1p oPHjbpRClLCIpn2WAgkqgKv154yQTtTUI/ub1v5syLAG7KhRnUPD80y6etg4Q7i7VwS9OO/OrgzM+ EPcMJp8EPVVRfsNKCWI2OykxguK7KldDtiFLiyifpCQPEK8SQd+STs2YeS17DRH0BdJlzjlGbGhKT dpSqdP8aovjMx7zznKtztTI4TbicfD/I2NZ/BpeODOYSd9uT4ZhOLUSA4kDpKyzaMSUXsQ/tv8vWc X1lhVx3nkyL1aAV59RkVn1ZbVbNQChe3y2eq+icSW77YbZ4bVBbR/iJ7x75teBnO16CIjzIzrMZqU ZEFRbI0GMQPlUJm+krKQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jXyGg-00025V-Gy; Mon, 11 May 2020 02:34:10 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jXyGd-00024Y-9P; Mon, 11 May 2020 02:34:08 +0000 X-UUID: b2cfdf7f69764768b3d93db3087d2dfe-20200510 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:Message-ID:Date:Subject:CC:To:From; bh=Q+QJySbZSKJn63iVkOIGiMVFBu2s5kjFXMpG7KKjPkw=; b=RCuxbCE7dxHYqABBQ/0hgelavpR1aQ1O8+JFOyuI+N+ksU/ATNy1wNDtaL6F4O3vPFeCuHyjIqLhatxtxG/OILE64c1WFnNm6I81b9l7XSGrEGpFYDTQnfwHD1m6Rr7tDtJI/CwTUaGG28BhsfWCGvjT64fOqr25oaAE5uAdIsg=; X-UUID: b2cfdf7f69764768b3d93db3087d2dfe-20200510 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 1693491603; Sun, 10 May 2020 18:34:04 -0800 Received: from MTKMBS06N1.mediatek.inc (172.21.101.129) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sun, 10 May 2020 19:32:28 -0700 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs06n1.mediatek.inc (172.21.101.129) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 11 May 2020 10:32:31 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 11 May 2020 10:32:31 +0800 From: Walter Wu To: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Jonathan Corbet Subject: [PATCH v2 3/3] kasan: update documentation for generic kasan Date: Mon, 11 May 2020 10:32:31 +0800 Message-ID: <20200511023231.15437-1-walter-zh.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200510_193407_335573_6A659077 X-CRM114-Status: UNSURE ( 6.40 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Walter Wu , wsd_upstream , linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Generic KASAN will support to record first and last call_rcu() call stack and print them in KASAN report. so we update documentation. Signed-off-by: Walter Wu Cc: Andrey Ryabinin Cc: Dmitry Vyukov Cc: Alexander Potapenko Cc: Jonathan Corbet --- Documentation/dev-tools/kasan.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index c652d740735d..d4efcfde9fff 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -193,6 +193,12 @@ function calls GCC directly inserts the code to check the shadow memory. This option significantly enlarges kernel but it gives x1.1-x2 performance boost over outline instrumented kernel. +Currently generic KASAN can print call_rcu() call stack in KASAN report, it +can't increase the cost of memory consumption, but it has one limitations. +It can't get both call_rcu() call stack and free stack, so that it can't +print free stack for allocation objects in KASAN report. This feature is +only suitable for generic KASAN. + Software tag-based KASAN ~~~~~~~~~~~~~~~~~~~~~~~~