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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 C002AC2BB55 for ; Thu, 16 Apr 2020 13:52:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F9D02063A for ; Thu, 16 Apr 2020 13:52:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587045146; bh=12ZmjrZ7vXDZ1I0Fi1c7lbqZUkrXG04AQoXKts4YLE8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EyhQNluK1QD/CZ73/W6sTktI92vioYNOHFAwmJNw5+4M3ObezYQRU+L6RIOVfvJok urC7bjIBIxTHxaaT0bgjpN0tMIpJpRw1kANKtUr8W0OWXyMxZt+SOz2qtnjQ8164qt +mXOqdyGa7GoPtLsNlR7Kyc7uGYiwa5PBEp0vFiQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408890AbgDPNwW (ORCPT ); Thu, 16 Apr 2020 09:52:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:49104 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2897389AbgDPNg5 (ORCPT ); Thu, 16 Apr 2020 09:36:57 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F075E221EB; Thu, 16 Apr 2020 13:36:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044217; bh=12ZmjrZ7vXDZ1I0Fi1c7lbqZUkrXG04AQoXKts4YLE8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qcx5Acq2+NVDxYqrKkmJtUi9EG/VnahfL6cYcMCnrnvQMD2eQ4XRITPphf8TIltZe VFj6XonX04weX70jXrLTrHFI0gBcCk3omSShm16/lP34IBCc/+xgV5zG8S9/1Oqltu clv1v66Bq2/1QiOVtUtyiuvwqwK3nrgxF45B2WoE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jens Axboe Subject: [PATCH 5.5 129/257] io_uring: remove bogus RLIMIT_NOFILE check in file registration Date: Thu, 16 Apr 2020 15:23:00 +0200 Message-Id: <20200416131342.528363405@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jens Axboe commit c336e992cb1cb1db9ee608dfb30342ae781057ab upstream. We already checked this limit when the file was opened, and we keep it open in the file table. Hence when we added unit_inflight to the count we want to register, we're doubly accounting these files. This results in -EMFILE for file registration, if we're at half the limit. Cc: stable@vger.kernel.org # v5.1+ Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 7 ------- 1 file changed, 7 deletions(-) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4162,13 +4162,6 @@ static int __io_sqe_files_scm(struct io_ struct sk_buff *skb; int i, nr_files; - if (!capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN)) { - unsigned long inflight = ctx->user->unix_inflight + nr; - - if (inflight > task_rlimit(current, RLIMIT_NOFILE)) - return -EMFILE; - } - fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); if (!fpl) return -ENOMEM;