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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 E8334C433E0 for ; Fri, 19 Jun 2020 14:30:46 +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 B3A6B20720 for ; Fri, 19 Jun 2020 14:30:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="N251QuOc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B3A6B20720 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34602 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jmI2Y-00022V-0I for qemu-devel@archiver.kernel.org; Fri, 19 Jun 2020 10:30:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38672) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jmI1E-0000bm-07 for qemu-devel@nongnu.org; Fri, 19 Jun 2020 10:29:24 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:56839 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jmI1C-0007uQ-3g for qemu-devel@nongnu.org; Fri, 19 Jun 2020 10:29:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592576961; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=XwjHd40W50OknavUnr+gziP7g2F1L6v+BWslIjZEhbM=; b=N251QuOcXcMVqlewEOqU0U7gWrgDjzWKnhuxRTqDr8z6EDx29wO4usQyX/L4omxIXYtaFr KbiV/pt3UjK0v0nt3aXM96dWNlwvOKQygwDW1GysE261EC3bEPjFztmCnYpc0cW3o8h0+p kz+IyQ2XUKLjxiGbLLeJsh44sTqJ+Vg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-414-tl1gfxRYPc6vFz4G8tkTsQ-1; Fri, 19 Jun 2020 10:29:19 -0400 X-MC-Unique: tl1gfxRYPc6vFz4G8tkTsQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0A7421800D42; Fri, 19 Jun 2020 14:29:18 +0000 (UTC) Received: from horse.redhat.com (ovpn-114-35.rdu2.redhat.com [10.10.114.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id 36C3F10021B3; Fri, 19 Jun 2020 14:29:12 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 56E9E220390; Fri, 19 Jun 2020 10:29:11 -0400 (EDT) Date: Fri, 19 Jun 2020 10:29:11 -0400 From: Vivek Goyal To: Miklos Szeredi Subject: Re: [Virtio-fs] [PATCH 0/2] virtiofsd: drop Linux capabilities(7) Message-ID: <20200619142911.GC3154@redhat.com> References: <20200416164907.244868-1-stefanha@redhat.com> <20200618190816.GD3814@redhat.com> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=205.139.110.61; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/19 02:45:39 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: , Cc: virtio-fs-list , qemu-devel@nongnu.org, Stefan Hajnoczi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Jun 19, 2020 at 04:16:30PM +0200, Miklos Szeredi wrote: > On Thu, Jun 18, 2020 at 9:08 PM Vivek Goyal wrote: > > > > On Thu, Apr 16, 2020 at 05:49:05PM +0100, Stefan Hajnoczi wrote: > > > virtiofsd doesn't need of all Linux capabilities(7) available to root. Keep a > > > whitelisted set of capabilities that we require. This improves security in > > > case virtiofsd is compromised by making it hard for an attacker to gain further > > > access to the system. > > > > Hi Stefan, > > > > I just noticed that this patch set breaks overlayfs on top of virtiofs. > > How so? Virtiofs isn't mounting overlayfs, is it? Only the mounter > requires CAP_SYS_ADMIN, not the accessor. Are you thinking of virtiofs on top of overlayfs? I was referring to mounting overlayfs on top of virtiofs inside VM. Thanks Vivek