From patchwork Wed Oct 20 09:48:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?S3Vhbi1ZaW5nIExlZSAo5p2O5Yag56mOKQ==?= X-Patchwork-Id: 12571943 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0EDC7C433FE for ; Wed, 20 Oct 2021 09:51:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A39D261373 for ; Wed, 20 Oct 2021 09:51:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A39D261373 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 025776B0071; Wed, 20 Oct 2021 05:51:34 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id F16F66B0072; Wed, 20 Oct 2021 05:51:33 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DDCCF900002; Wed, 20 Oct 2021 05:51:33 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0199.hostedemail.com [216.40.44.199]) by kanga.kvack.org (Postfix) with ESMTP id CBCFE6B0071 for ; Wed, 20 Oct 2021 05:51:33 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 7F8A9181AF5C2 for ; Wed, 20 Oct 2021 09:51:33 +0000 (UTC) X-FDA: 78716348466.27.B3F38C4 Received: from mailgw01.mediatek.com (mailgw01.mediatek.com [216.200.240.184]) by imf12.hostedemail.com (Postfix) with ESMTP id 02FC910000A5 for ; Wed, 20 Oct 2021 09:51:31 +0000 (UTC) X-UUID: 5b1f7f6d6bff4784a836801ce3c51888-20211020 X-UUID: 5b1f7f6d6bff4784a836801ce3c51888-20211020 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1666861593; Wed, 20 Oct 2021 02:51:28 -0700 Received: from mtkmbs10n1.mediatek.inc (172.21.101.34) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 20 Oct 2021 02:48:54 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Wed, 20 Oct 2021 17:48:52 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 20 Oct 2021 17:48:52 +0800 From: Kuan-Ying Lee To: Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Catalin Marinas , Will Deacon , Andrew Morton , "Matthias Brugger" , Marco Elver CC: , , , , , , , , Kuan-Ying Lee Subject: [PATCH v3] kasan: add kasan mode messages when kasan init Date: Wed, 20 Oct 2021 17:48:50 +0800 Message-ID: <20211020094850.4113-1-Kuan-Ying.Lee@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 02FC910000A5 X-Stat-Signature: md119qzuczjdxktoeezxwz6jmd5nugfz Authentication-Results: imf12.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=mediatek.com; spf=pass (imf12.hostedemail.com: domain of kuan-ying.lee@mediatek.com designates 216.200.240.184 as permitted sender) smtp.mailfrom=kuan-ying.lee@mediatek.com X-HE-Tag: 1634723491-728507 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: There are multiple kasan modes. It makes sense that we add some messages to know which kasan mode is when booting up. see [1]. Link: https://bugzilla.kernel.org/show_bug.cgi?id=212195 [1] Signed-off-by: Kuan-Ying Lee Reviewed-by: Marco Elver Reviewed-by: David Hildenbrand --- v3: - Rebase to linux-next - Move kasan_mode_info() into hw_tags.c v2: - Rebase to linux-next - HW-tag based mode need to consider asymm mode - Thanks Marco's suggestion arch/arm64/mm/kasan_init.c | 2 +- mm/kasan/hw_tags.c | 14 +++++++++++++- mm/kasan/sw_tags.c | 2 +- 3 files changed, 15 insertions(+), 3 deletions(-) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 5b996ca4d996..6f5a6fe8edd7 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -309,7 +309,7 @@ void __init kasan_init(void) kasan_init_depth(); #if defined(CONFIG_KASAN_GENERIC) /* CONFIG_KASAN_SW_TAGS also requires kasan_init_sw_tags(). */ - pr_info("KernelAddressSanitizer initialized\n"); + pr_info("KernelAddressSanitizer initialized (generic)\n"); #endif } diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c index dc892119e88f..7355cb534e4f 100644 --- a/mm/kasan/hw_tags.c +++ b/mm/kasan/hw_tags.c @@ -106,6 +106,16 @@ static int __init early_kasan_flag_stacktrace(char *arg) } early_param("kasan.stacktrace", early_kasan_flag_stacktrace); +static inline const char *kasan_mode_info(void) +{ + if (kasan_mode == KASAN_MODE_ASYNC) + return "async"; + else if (kasan_mode == KASAN_MODE_ASYMM) + return "asymm"; + else + return "sync"; +} + /* kasan_init_hw_tags_cpu() is called for each CPU. */ void kasan_init_hw_tags_cpu(void) { @@ -177,7 +187,9 @@ void __init kasan_init_hw_tags(void) break; } - pr_info("KernelAddressSanitizer initialized\n"); + pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, stacktrace=%s)\n", + kasan_mode_info(), + kasan_stack_collection_enabled() ? "on" : "off"); } void kasan_alloc_pages(struct page *page, unsigned int order, gfp_t flags) diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c index bd3f540feb47..77f13f391b57 100644 --- a/mm/kasan/sw_tags.c +++ b/mm/kasan/sw_tags.c @@ -42,7 +42,7 @@ void __init kasan_init_sw_tags(void) for_each_possible_cpu(cpu) per_cpu(prng_state, cpu) = (u32)get_cycles(); - pr_info("KernelAddressSanitizer initialized\n"); + pr_info("KernelAddressSanitizer initialized (sw-tags)\n"); } /*