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=-4.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 CA76BC04AB6 for ; Tue, 28 May 2019 11:33:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 963782081C for ; Tue, 28 May 2019 11:33:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=rasmusvillemoes.dk header.i=@rasmusvillemoes.dk header.b="gp3O9MMh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726728AbfE1LdR (ORCPT ); Tue, 28 May 2019 07:33:17 -0400 Received: from mail-lj1-f195.google.com ([209.85.208.195]:45795 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726313AbfE1LdR (ORCPT ); Tue, 28 May 2019 07:33:17 -0400 Received: by mail-lj1-f195.google.com with SMTP id r76so6551781lja.12 for ; Tue, 28 May 2019 04:33:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rasmusvillemoes.dk; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=MABWQ31ON0TR0IpKjWED0HazwKzgQ/WMHokiAHc03aw=; b=gp3O9MMh8feHVMlWj5VYKJcykIPIicL9qftBC/g9U0fwewHKMqLl/MofGdBtVkNQkn IVMlKW8Hg9P4j1I/cAMJa9HrB4mM0IErnXAPx5uimKXNozFbkOZjW9Pd6yh7lq5cNuXf doEylPmDq6h3Idyz947RnLdOZ827Ft3PUcSi4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=MABWQ31ON0TR0IpKjWED0HazwKzgQ/WMHokiAHc03aw=; b=temy441mgyLHJ2ks8rkjI5qkCQ07yTkQ2QYCuF2t/g33CryBlzdGj+RDnZf3fR2yHZ SGyP91puN3B1kmz/8/AdKB2YRvXTfr9IbB9OTj5mlAv9DLuyqoxQHqNISIsTQZqpcBiI fhQoIJ2aoSzwc3hzLCgPKbXhcx1qTpSnA19OARb+kfEUnL9h11NT4i0aFup0wnI6QN29 cuAK89LQSl0LFPNwgQp+wRhCQwAbWkqjim7fdL2imPfOsRftqvudod+B7QVJsWNXVleR X/lYnbi79dvNwAxQlqB+hePbd3kSjADudfizmqS+44xhf2PU1JNDPjqUIABX41IF3opR 8Mxw== X-Gm-Message-State: APjAAAU3KV4P/fQ+Atg/uTtwyy91XjcK3xWHmZFQaTDqFyqW23Jq9stz ROWwPWjnUtlKNxYN72FrtgF3mw== X-Google-Smtp-Source: APXvYqzAlj8nXBkXY9tXvwNZyhuuVjUcaz9St3nOjjKOjPyJt3ZdpGQUcyp52yMvVHPwvG4kJ/5Sbw== X-Received: by 2002:a2e:12ce:: with SMTP id 75mr35464957ljs.7.1559043194790; Tue, 28 May 2019 04:33:14 -0700 (PDT) Received: from [172.16.11.26] ([81.216.59.226]) by smtp.gmail.com with ESMTPSA id d2sm2177643lfj.0.2019.05.28.04.33.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 May 2019 04:33:13 -0700 (PDT) Subject: Re: LZ4 decompressor broken on ARM due to missing strchrnul() string traverse in cpumask_parse" To: Sebastian Andrzej Siewior , Yury Norov , Andrew Morton Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20190528110412.gg66fl67yahtwb6i@linutronix.de> From: Rasmus Villemoes Message-ID: Date: Tue, 28 May 2019 13:33:12 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190528110412.gg66fl67yahtwb6i@linutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28/05/2019 13.04, Sebastian Andrzej Siewior wrote: > | CC arch/arm/boot/compressed/decompress.o > |In file included from include/linux/mm_types_task.h:14, > | from include/linux/mm_types.h:5, > | from include/linux/mmzone.h:21, > | from include/linux/gfp.h:6, > | from include/linux/umh.h:4, > | from include/linux/kmod.h:22, > | from include/linux/module.h:13, > | from arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:39, > | from arch/arm/boot/compressed/../../../../lib/decompress_unlz4.c:13, > | from arch/arm/boot/compressed/decompress.c:55: > |include/linux/cpumask.h: In function ‘cpumask_parse’: > |include/linux/cpumask.h:636:21: error: implicit declaration of function ‘strchrnul’; did you mean ‘strchr’? [-Werror=implicit-function-declaration] > | unsigned int len = strchrnul(buf, '\n') - buf; > | ^~~~~~~~~ > | strchr > |include/linux/cpumask.h:636:42: error: invalid operands to binary - (have ‘int’ and ‘const char *’) > | unsigned int len = strchrnul(buf, '\n') - buf; > | ~~~~~~~~~~~~~~~~~~~~ ^ > |cc1: some warnings being treated as errors > > 3713a4e1fdb8da86f96a3e770b08e278d97529b4 is the first bad commit > commit 3713a4e1fdb8da86f96a3e770b08e278d97529b4 > Author: Yury Norov > Date: Tue May 14 15:44:46 2019 -0700 > > include/linux/cpumask.h: fix double string traverse in cpumask_parse > > cpumask_parse() finds first occurrence of either or strchr() and > strlen(). We can do it better with a single call of strchrnul(). > > [akpm@linux-foundation.org: remove unneeded cast] > Link: http://lkml.kernel.org/r/20190409204208.12190-1-ynorov@marvell.com > Signed-off-by: Yury Norov > Acked-by: Rasmus Villemoes > Signed-off-by: Andrew Morton > Signed-off-by: Linus Torvalds > > :040000 040000 f20d8a9ec1755b3981520ecf015248f6a0d9f116 db67caf64f99a9be808cd73e413c106c5aee15b7 M include > > This commit is v5.2-rc1~62^2~49. > How do we deal with this one? Urgh. The problem is really in arch/arm/boot/compressed/decompress.c which does #define _LINUX_STRING_H_ preventing linux/string.h from providing strchrnul. It also #includes asm/string.h, which for arm has a declaration of strchr(), explaining why this didn't use to fail. However, the solution is also in the same file, it already has a section /* Not needed, but used in some headers pulled in by decompressors */ extern char * strstr(const char * s1, const char *s2); extern size_t strlen(const char *s); extern int memcmp(const void *cs, const void *ct, size_t count); so just add another declaration to that list - I strongly assume we won't get a link failure since I find it hard to believe the decompressor would actually call cpumask_parse... I'm wondering why this wasn't caught by 0day and/or while in -next? Rasmus 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=-4.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED 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 A93A2C04AB6 for ; Tue, 28 May 2019 11:33:25 +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 7CE522081C for ; Tue, 28 May 2019 11:33:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org 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<20190528110412.gg66fl67yahtwb6i@linutronix.de> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190528_043318_673384_FAEDED05 X-CRM114-Status: GOOD ( 17.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjgvMDUvMjAxOSAxMy4wNCwgU2ViYXN0aWFuIEFuZHJ6ZWogU2lld2lvciB3cm90ZToKPiB8 ICBDQyAgICAgIGFyY2gvYXJtL2Jvb3QvY29tcHJlc3NlZC9kZWNvbXByZXNzLm8KPiB8SW4gZmls ZSBpbmNsdWRlZCBmcm9tIGluY2x1ZGUvbGludXgvbW1fdHlwZXNfdGFzay5oOjE0LAo+IHwgICAg 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