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: 11539635 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 744D3913 for ; Mon, 11 May 2020 02:32:40 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 41232207FF for ; Mon, 11 May 2020 02:32:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="RCuxbCE7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 41232207FF 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 6EC878E0007; Sun, 10 May 2020 22:32:39 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 69D578E0001; Sun, 10 May 2020 22:32:39 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5DB698E0007; Sun, 10 May 2020 22:32:39 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0213.hostedemail.com [216.40.44.213]) by kanga.kvack.org (Postfix) with ESMTP id 4B35A8E0001 for ; Sun, 10 May 2020 22:32:39 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 18ACB180AD80F for ; Mon, 11 May 2020 02:32:39 +0000 (UTC) X-FDA: 76802864838.20.pig40_342638ed15120 X-Spam-Summary: 2,0,0,7001f83e1aa8e40c,d41d8cd98f00b204,walter-zh.wu@mediatek.com,,RULES_HIT:41:355:379:541:800:960:966:973:988:989:1042:1185:1260:1277:1311:1313:1314:1345:1431:1437:1514:1515:1516:1518:1534:1541:1585:1711:1730:1747:1777:1792:1978:1981:2194:2196:2198:2199:2200:2201:2393:2559:2562:2693:2740:2895:3138:3139:3140:3141:3142:3352:3865:3866:3867:3868:3870:3871:3872:3874:4250:4385:5007:6119:6261:6653:8660:10004:10400:11232:11658:11914:12043:12048:12198:12297:12521:12555:12895:13069:13146:13148:13230:13311:13357:14181:14394:14721:21080:21451:21627:21772:30012:30054:30070,0,RBL:210.61.82.183:@mediatek.com:.lbl8.mailshell.net-64.100.201.201 62.2.12.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: pig40_342638ed15120 X-Filterd-Recvd-Size: 3879 Received: from mailgw01.mediatek.com (unknown [210.61.82.183]) by imf09.hostedemail.com (Postfix) with ESMTP for ; Mon, 11 May 2020 02:32:38 +0000 (UTC) X-UUID: 227923f835d44eaab8c33af54d6c954c-20200511 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: 227923f835d44eaab8c33af54d6c954c-20200511 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw01.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 1754945740; Mon, 11 May 2020 10:32:33 +0800 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 CC: , , , , wsd_upstream , , Walter Wu 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-Bogosity: Ham, tests=bogofilter, spamicity=0.081756, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 ~~~~~~~~~~~~~~~~~~~~~~~~