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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 C281DC432C3 for ; Fri, 15 Nov 2019 14:12:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9819A20730 for ; Fri, 15 Nov 2019 14:12:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="AlvIrFaA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727423AbfKOOMN (ORCPT ); Fri, 15 Nov 2019 09:12:13 -0500 Received: from mail-qk1-f181.google.com ([209.85.222.181]:34140 "EHLO mail-qk1-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727406AbfKOOMM (ORCPT ); Fri, 15 Nov 2019 09:12:12 -0500 Received: by mail-qk1-f181.google.com with SMTP id 205so8191454qkk.1 for ; Fri, 15 Nov 2019 06:12:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to :user-agent; bh=688DTXKSr3aomaEwniZtT0+2EO/VX7hb7rNSjmyBgCY=; b=AlvIrFaAMla8hhZJ7j4zMLopp1ZuByAzT8GbmYTNrtafYUqSitUrYuMok/t4DFRZfM h0l9TJUiZBZn0E1YaME7Uchgqd0hE3wIU0nQMvC17jlnSuxsdaj94FkMJZ6Nxs+xbntg AKHKqXiC1cQn0z/rsVjdp/u/71edGXbRkm6ut2QOtO05e8I1aEpN0YRvPctTONDbqOYz YtVvz9eyleVYpKhZpz1smTMTBOT1n3gKfuydRdQbrRY+5K9RWJ0IIHJY8dgaWy2jTSnb 1+gYtldXg0Y7RsesupzvfrPYFLZqmmny0blwL02N0dWDayMI+QFNus3rACjQUkS63WHP g2Ag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=688DTXKSr3aomaEwniZtT0+2EO/VX7hb7rNSjmyBgCY=; b=KshDbGAXIFhtHq+WxfrUWbmUnuGXIh4tXIdRg+GlPlXYSDkn2FQZvgZdg7AiFTvrUf 3CHv18CtgBjJfO9db0O3iH4UW+zHwMNgr09kCNROZkyH5ucnItd3WgM+x36C58rQ4lnO VXPOCviEfHMQF0ikqIFwti8eTw1G+QQ1ZE6oN8lDlj3xEeBYMm1lFZoo8aWuf7Rj+KAA xRalyi2Guwq44ElIitJGzWqDo4tqY6huR4VCItNDXIeDbUNpeb1xX4W1JgXtUTy1kM+b c8wrypp6Ra7cCPuGp8YNBvbFcaNVNARfl49KYzdxBnoy3FVCmaxEUsYr3zekxM/8KSrz LyXw== X-Gm-Message-State: APjAAAWziNkCxZn83H3tdJBKG/925KT4j2VgPxsfBffp0veZUMHbZdbV xZVytCpLwFxJUfR72WZ+rScv/g== X-Google-Smtp-Source: APXvYqyRbYfnUDJOxQsM1zBPoIErPRkqSqztPFvddkF6oX0O6Z8Wl+JZzN+AgsPY3jFI1hqXwNxReA== X-Received: by 2002:a37:68a:: with SMTP id 132mr12727181qkg.359.1573827131935; Fri, 15 Nov 2019 06:12:11 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-113-180.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.113.180]) by smtp.gmail.com with ESMTPSA id j7sm4107365qkd.46.2019.11.15.06.12.11 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 15 Nov 2019 06:12:11 -0800 (PST) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1iVcKY-0002z0-Sr; Fri, 15 Nov 2019 10:12:10 -0400 Date: Fri, 15 Nov 2019 10:12:10 -0400 From: Jason Gunthorpe To: Vinit Agnihotri Cc: linux-rdma@vger.kernel.org Subject: Re: [question] ibv_reg_mr() returning EACCESS Message-ID: <20191115141210.GC4055@ziepe.ca> References: <141f4c07-b7f1-1355-7ff7-d62605ee63b5@ryussi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <141f4c07-b7f1-1355-7ff7-d62605ee63b5@ryussi.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Fri, Nov 15, 2019 at 09:27:40AM +0530, Vinit Agnihotri wrote: > Hi, > > I am trying to use setfsgid()/setfssid() calls to ensure proper access check > for linux users. > > However if user is non-root then ibv_reg_mr() returns EACCESS. While I am > sure I am calling ibv_reg_mr() > > as root user, not sure why it still returns EACCESS. > > While going through libibverbs sources I realize EACCESS might be returned > by this call: > > if (write(pd->context->cmd_fd, cmd, cmd_size) != cmd_size) >         return errno; > > Can anyone provide any insight into this behavior? Does calling these > systems calls in threads can affect > > entire process? I checked /dev/infiniband/* has appropriate privileges. This is a security limitation, if you want do this flow you need a new enough kernel and rdma-core to support the ioctl() scheme for calling verbs Jason