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=-20.6 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 EAF5AC433E0 for ; Tue, 4 Aug 2020 12:41:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B4337208A9 for ; Tue, 4 Aug 2020 12:41:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="epaWaJlt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B4337208A9 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2B8CB8D0159; Tue, 4 Aug 2020 08:41:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2911D8D0081; Tue, 4 Aug 2020 08:41:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1A6D28D0159; Tue, 4 Aug 2020 08:41:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0234.hostedemail.com [216.40.44.234]) by kanga.kvack.org (Postfix) with ESMTP id 022478D0081 for ; Tue, 4 Aug 2020 08:41:42 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id B04E9180AD817 for ; Tue, 4 Aug 2020 12:41:42 +0000 (UTC) X-FDA: 77112847644.09.pest32_2311d0426fa6 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin09.hostedemail.com (Postfix) with ESMTP id 5AE82180AD802 for ; Tue, 4 Aug 2020 12:41:42 +0000 (UTC) X-HE-Tag: pest32_2311d0426fa6 X-Filterd-Recvd-Size: 4965 Received: from mail-wr1-f74.google.com (mail-wr1-f74.google.com [209.85.221.74]) by imf31.hostedemail.com (Postfix) with ESMTP for ; Tue, 4 Aug 2020 12:41:41 +0000 (UTC) Received: by mail-wr1-f74.google.com with SMTP id b18so9564662wrn.6 for ; Tue, 04 Aug 2020 05:41:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=KTaExCeIbMBtrg6f3KaFtKJ9kXln1IxZOo4x1K8ywoo=; b=epaWaJlt64ntx42FNABLMyLva14SlmdYcoGzzYGyrXWUnAJnxMu5GEZgilr7YOjQyg rwN+m322Ym4K72DntPYQLTQpUlUsvtp9hOED35dktAjWzCeoMAdqgWFu+8q67qvVGdd0 ASSvypkGepo2fVM74GawP/zGW8ARgykh7GWGHusAgWS8l/UBxb0pdkO0TYQ7EmgRfqVS +AhohRsPKYfLCyuszVYf5jaiW3P7HKDO0xMW0AxuHSElSjjWJ6UveE2t2MgCnIL+ItDv /1ed6bLGDRty9mFhZhCq6dEUtquKavGW9+Vz9/sId52Rf88V2RXw/k9gqiVHbxbaBWtN +9hQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=KTaExCeIbMBtrg6f3KaFtKJ9kXln1IxZOo4x1K8ywoo=; b=H2m+h3aFc4kaM7WswoJb5CzR9rmpCZ2PaUGd6EqJjkODlhIn2t2vFdr1JAwWZKy8YB A+D7MtOCJwWLOr2yewxrNXiMtfQI6gkNngjpKHvKb7r2MWy11dbgbnOCA5m48FRoiHki unnNwbZ9GtpAtFU2NR5LErY5O1WgV+Y802ElHnE4YbGlMWtNltTQmBoY9TYuCpKhlZjI kakUkUX69yKyK8kE2K2t4JSLCRh13Rdigrh/Pb9npU5cEg5E7KxQz2rfOwloRw3mYtVS MUPDR5yEWdFaMX/s5+FmO9MBAdixmAG5Lk10b3fJUjZY/BRgYBGEc38jPuqDSInIXbl5 66uA== X-Gm-Message-State: AOAM530nMSM70gfur6txsBCyByIKz2ZNSIf8QkeanNidgADh1nwL2AeP ra4bu45eojbSonifZuQvfIGBnUf5qekMRME0 X-Google-Smtp-Source: ABdhPJwWjosW9Y2ZD4qtR2i07CuuW2KOWsc+Y1P+/2KrTNBkB6pCcdGVRsu0tHMa3wVdBR/M1mpyQCpyke7nl0k9 X-Received: by 2002:a7b:cd93:: with SMTP id y19mr492659wmj.0.1596544900281; Tue, 04 Aug 2020 05:41:40 -0700 (PDT) Date: Tue, 4 Aug 2020 14:41:26 +0200 In-Reply-To: Message-Id: <26fb6165a17abcf61222eda5184c030fb6b133d1.1596544734.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.28.0.163.g6104cc2f0b6-goog Subject: [PATCH v2 3/5] kasan, arm64: don't instrument functions that enable kasan From: Andrey Konovalov To: Andrew Morton Cc: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Marco Elver , Ard Biesheuvel , Arvind Sankar , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, Walter Wu , Elena Petrova , Vincenzo Frascino , Catalin Marinas , Andrey Konovalov Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 5AE82180AD802 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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: This patch prepares Software Tag-Based KASAN for stack tagging support. With stack tagging enabled, KASAN tags stack variable in each function in its prologue. In start_kernel() stack variables get tagged before KASAN is enabled via setup_arch()->kasan_init(). As the result the tags for start_kernel()'s stack variables end up in the temporary shadow memory. Later when KASAN gets enabled, switched to normal shadow, and starts checking tags, this leads to false-positive reports, as proper tags are missing in normal shadow. Disable KASAN instrumentation for start_kernel(). Also disable it for arm64's setup_arch() as a precaution (it doesn't have any stack variables right now). Signed-off-by: Andrey Konovalov --- arch/arm64/kernel/setup.c | 2 +- init/main.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 93b3844cf442..575da075a2b9 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -276,7 +276,7 @@ arch_initcall(reserve_memblock_reserved_regions); u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; -void __init setup_arch(char **cmdline_p) +void __init __no_sanitize_address setup_arch(char **cmdline_p) { init_mm.start_code = (unsigned long) _text; init_mm.end_code = (unsigned long) _etext; diff --git a/init/main.c b/init/main.c index 0ead83e86b5a..7e5e25d9fe42 100644 --- a/init/main.c +++ b/init/main.c @@ -827,7 +827,7 @@ void __init __weak arch_call_rest_init(void) rest_init(); } -asmlinkage __visible void __init start_kernel(void) +asmlinkage __visible void __init __no_sanitize_address start_kernel(void) { char *command_line; char *after_dashes; -- 2.28.0.163.g6104cc2f0b6-goog