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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 8EED3C433E0 for ; Fri, 8 Jan 2021 17:48:01 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 CE79C23A61 for ; Fri, 8 Jan 2021 17:48:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CE79C23A61 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34002 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kxvrj-0002lb-Fq for qemu-devel@archiver.kernel.org; Fri, 08 Jan 2021 12:47:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41882) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kxvqs-0002L2-P1 for qemu-devel@nongnu.org; Fri, 08 Jan 2021 12:47:06 -0500 Received: from mail-wr1-x436.google.com ([2a00:1450:4864:20::436]:39721) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kxvqo-0002Ej-Al for qemu-devel@nongnu.org; Fri, 08 Jan 2021 12:47:06 -0500 Received: by mail-wr1-x436.google.com with SMTP id c5so9782302wrp.6 for ; Fri, 08 Jan 2021 09:47:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=message-id:subject:from:to:date:user-agent:mime-version :content-transfer-encoding; bh=GPnhufm1gkN558OqkqWvAPYufvUP6yYE4W7hNXWoHAc=; b=FZasHKVpLXY3VHYtTVlf/hu0V93J8sOvKC2ej4a3BcAPqfIZXwexetI1VwwIgJ9ATT 5dxK8q4CfYFLz8+o4v0y6S5ZXhOOP4b2xg/EsjBAZ0TmwT1VWwGyjTRdub6Izq5uUni4 WlKsWFF2qmLhotwTfakcq4Y2XCxA/Ox0mMmsk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:date:user-agent :mime-version:content-transfer-encoding; bh=GPnhufm1gkN558OqkqWvAPYufvUP6yYE4W7hNXWoHAc=; b=CBfQZ8yO436Fn2gSwBU6isaupAR4bAQBIQMS+iXufIXMwya2nMg6ClS6p6Hny/kq6K qtuzMSAulKvMHNNDJAGncEfWbUSdUqm8+FcuSByIaNhjhTl8yH0eQ1NHRgrl3uNqnBNO L7GuxdJFtITRxw4lUnghIA6+ZQ40loCS+d0adgFJ6ew4idSyQf/k/a7HhfRivxCreipu KN5z8kGnO5JKTPIgE6ofteMu+qly+idtsbpLdbtwlAdGpyo4hQYzEUbHKU+hL8zMLbhP aAC6pDQHAIAoODyfI7hKk6/RTAH4/gfpvZEx4O0Gj97jrTD1we7J0CeSdWhm0IoOTcIu FF5A== X-Gm-Message-State: AOAM533LShxlGYiJteHAgAy18j7QrqGNM3E/Qx4IdfXqnPuxpneyBd2c M2KlmOZEXxV4HgPLCV6n6uSCB4X8VsfeFQ== X-Google-Smtp-Source: ABdhPJzqV39zBHUt4cQ9ioydZg8RYSkfm4HM4CaijZi1oGLolKqgZLuZNNG9GYZlB76zWePKDoRj6w== X-Received: by 2002:adf:9525:: with SMTP id 34mr4836780wrs.389.1610128020627; Fri, 08 Jan 2021 09:47:00 -0800 (PST) Received: from ?IPv6:2001:8b0:aba:5f3c:8262:2156:a38b:824c? ([2001:8b0:aba:5f3c:8262:2156:a38b:824c]) by smtp.gmail.com with ESMTPSA id o23sm15082903wro.57.2021.01.08.09.47.00 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Jan 2021 09:47:00 -0800 (PST) Message-ID: Subject: [RFC PATCH] linux-user/mmap: Return EFAULT for invalid addresses From: Richard Purdie To: "qemu-devel@nongnu.org" Date: Fri, 08 Jan 2021 17:46:59 +0000 Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.38.1-1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::436; envelope-from=richard.purdie@linuxfoundation.org; helo=mail-wr1-x436.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" When using qemu-i386 to run gobject introspection parts of a webkitgtk  build using musl as libc on a 64 bit host, it sits in an infinite loop  of mremap calls of ever decreasing/increasing addresses. I suspect something in the musl memory allocation code loops indefinitely if it only sees ENOMEM and only exits when it hits EFAULT. According to the docs, trying to mremap outside the address space can/should return EFAULT and changing this allows the build to succeed. There was previous discussion of this as it used to work before qemu 2.11 and we've carried hacks to work around it since, this appears to be a better fix of the real issue? Signed-off-by: Richard Purdie