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=-17.3 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,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 332FEC433E0 for ; Mon, 25 Jan 2021 16:32:00 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 DE10B22510 for ; Mon, 25 Jan 2021 16:31:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DE10B22510 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.74197.133314 (Exim 4.92) (envelope-from ) id 1l44mC-0001ta-96; Mon, 25 Jan 2021 16:31:40 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 74197.133314; Mon, 25 Jan 2021 16:31:40 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l44mC-0001tT-5y; Mon, 25 Jan 2021 16:31:40 +0000 Received: by outflank-mailman (input) for mailman id 74197; Mon, 25 Jan 2021 16:31:39 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l44mB-0001tO-BO for xen-devel@lists.xenproject.org; Mon, 25 Jan 2021 16:31:39 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 1976afbd-7bf6-41c0-9d36-006fcfd1420c; Mon, 25 Jan 2021 16:31:38 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 366E4AF27; Mon, 25 Jan 2021 16:31:37 +0000 (UTC) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 1976afbd-7bf6-41c0-9d36-006fcfd1420c X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1611592297; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0Ow5iAOBOzr3NoUdxlAtqGTf5XcUqc6XvwHg/NcZfrs=; b=TvMYHX/knvge1vlwiUlaEOWLXPYzDmRIFmN8vRspYI9aVIGS/HeU831FjMaYAvNmO1EtPt Yad/uEBe0vSck+buvVgPE9QvyCUzT1R+X8Jp3nY1rZFIME97+VVXIkK1jnHG+w/1ph6kFW e6pkWB6Ea8eNZdJihWYKVZARU93CBzk= Subject: Re: [PATCH v7 04/10] xen/memory: Add a vmtrace_buf resource type To: Andrew Cooper Cc: =?UTF-8?Q?Micha=c5=82_Leszczy=c5=84ski?= , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Wei Liu , Tamas K Lengyel , Xen-devel References: <20210121212718.2441-1-andrew.cooper3@citrix.com> <20210121212718.2441-5-andrew.cooper3@citrix.com> From: Jan Beulich Message-ID: <7702d1d6-86c9-af43-c9a9-f5ec082bad2d@suse.com> Date: Mon, 25 Jan 2021 17:31:36 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <20210121212718.2441-5-andrew.cooper3@citrix.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 21.01.2021 22:27, Andrew Cooper wrote: > --- a/xen/common/memory.c > +++ b/xen/common/memory.c > @@ -1068,11 +1068,35 @@ static unsigned int resource_max_frames(const struct domain *d, > case XENMEM_resource_grant_table: > return gnttab_resource_max_frames(d, id); > > + case XENMEM_resource_vmtrace_buf: > + return d->vmtrace_frames; > + > default: > return arch_resource_max_frames(d, type, id); > } > } > > +static int acquire_vmtrace_buf( > + struct domain *d, unsigned int id, unsigned long frame, > + unsigned int nr_frames, xen_pfn_t mfn_list[]) > +{ > + const struct vcpu *v = domain_vcpu(d, id); > + unsigned int i; > + mfn_t mfn; > + > + if ( !v || !v->vmtrace.buf || > + nr_frames > d->vmtrace_frames || > + (frame + nr_frames) > d->vmtrace_frames ) > + return -EINVAL; I think that for this to guard against overflow, the first nr_frames needs to be replaced by frame (as having the wider type), or else a very large value of frame coming in will not yield the intended -EINVAL. If you agree, with this changed, Reviewed-by: Jan Beulich Jan