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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_NEOMUTT 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 171FDC4360F for ; Tue, 2 Apr 2019 15:23:27 +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 DA7F720830 for ; Tue, 2 Apr 2019 15:23:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="X+5T6EfZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA7F720830 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=YPVo9OoRYmxel2SP/lPdAVUFZF4mndp78YhKjiUmHxE=; b=X+5T6EfZKroCEt AtuYGcSQQPxDAwDuxDYQNno8s5D9o1AOE89YRsGy9H1ZXSNnVtoP4u2f2xe+lm6tl0thBEvOmySKI e2eMe4EYHtesAIeHeMtPWlXwMUnvKHlMzJnI7eAyhkgOD3rcRS/0aWjxpw+kxCIR8OIw7UEHGYpng 1Vyi2xg9ZRC0k3kdBYn2BZXbbSfIT+46X53K7kaFKOy2KUSZg18tupXe26HRe6nscw2hfLplMl9qR mKxCyBYc0ICd+ktDctMRgg7nhcdWDS3T6VTqd41n77zTYtq7Or6X3InzC4ncVdW5ZDj+gd4xMfVW1 FECg6IQP6Wql42DcMG7g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBLFv-0000v2-EJ; Tue, 02 Apr 2019 15:23:19 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBLFr-0000j2-T3 for linux-arm-kernel@lists.infradead.org; Tue, 02 Apr 2019 15:23:17 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BE625374; Tue, 2 Apr 2019 08:23:13 -0700 (PDT) Received: from mbp (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 869B83F721; Tue, 2 Apr 2019 08:23:12 -0700 (PDT) Date: Tue, 2 Apr 2019 16:23:05 +0100 From: Catalin Marinas To: Vincenzo Frascino Subject: Re: [PATCH v2] arm64: compat: Reduce address limit Message-ID: <20190402152305.b43qnvavrhnnavgi@mbp> References: <20190401113014.20866-1-vincenzo.frascino@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190401113014.20866-1-vincenzo.frascino@arm.com> User-Agent: NeoMutt/20170113 (1.7.2) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190402_082315_948258_4BAC530E X-CRM114-Status: GOOD ( 11.16 ) 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: linux-arch@vger.kernel.org, Will Deacon , stable@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jann Horn Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Apr 01, 2019 at 12:30:14PM +0100, Vincenzo Frascino wrote: > Currently, compat tasks running on arm64 can allocate memory up to > TASK_SIZE_32 (UL(0x100000000)). > > This means that mmap() allocations, if we treat them as returning an > array, are not compliant with the sections 6.5.8 of the C standard > (C99) which states that: "If the expression P points to an element of > an array object and the expression Q points to the last element of the > same array object, the pointer expression Q+1 compares greater than P". > > Redefine TASK_SIZE_32 to address the issue. > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Jann Horn > Cc: > Reported-by: Jann Horn > Signed-off-by: Vincenzo Frascino I'll queue this patch for -rc4. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel