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,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 1EADEC3A5A9 for ; Mon, 4 May 2020 18:07:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF69F206B8 for ; Mon, 4 May 2020 18:07:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615678; bh=r3c1iXelmmBrzj0DTZL4IUaoj5TuLR7/oHUZShSDMrw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=RPKd/6o8NGo9ulthg8RJGZxbEW/ribhkQRnmpkI/XsQAKAFLNVY8UVMG+mI6xJeo+ beA5XGjpHyFsexcHiQWmxQGoRtl3uaPkB6FFiuOs8ZHEIi/sMqVumpkg17Fkdp8Fm9 4KAB74iNmz/w3YZl7U2dYJN+oGjVgdA4x0j+JKaU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731359AbgEDSH5 (ORCPT ); Mon, 4 May 2020 14:07:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:38802 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732176AbgEDSHq (ORCPT ); Mon, 4 May 2020 14:07:46 -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 034E6206B8; Mon, 4 May 2020 18:07:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615666; bh=r3c1iXelmmBrzj0DTZL4IUaoj5TuLR7/oHUZShSDMrw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C3pK66oL+V2je3XUHuHIqIzfTqdANHvJT34CvSWIFbkk5k+ZUgjBT+fRuPXmLFE76 IWwO0ZZXp2MaA6KjbsfconSk4G5kFoqeetI8b1qpCgxhJJt/tnPQmqIiWm4iSE09pt UyO9ZBDvd1lRR1PZ+EFM06HpdpTK0JHcEtn/UJDo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Clay Harris , Jens Axboe Subject: [PATCH 5.6 73/73] io_uring: statx must grab the file table for valid fd Date: Mon, 4 May 2020 19:58:16 +0200 Message-Id: <20200504165510.640529034@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200504165501.781878940@linuxfoundation.org> References: <20200504165501.781878940@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 5b0bbee4732cbd58aa98213d4c11a366356bba3d upstream. Clay reports that OP_STATX fails for a test case with a valid fd and empty path: -- Test 0: statx:fd 3: SUCCEED, file mode 100755 -- Test 1: statx:path ./uring_statx: SUCCEED, file mode 100755 -- Test 2: io_uring_statx:fd 3: FAIL, errno 9: Bad file descriptor -- Test 3: io_uring_statx:path ./uring_statx: SUCCEED, file mode 100755 This is due to statx not grabbing the process file table, hence we can't lookup the fd in async context. If the fd is valid, ensure that we grab the file table so we can grab the file from async context. Cc: stable@vger.kernel.org # v5.6 Reported-by: Clay Harris Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -479,6 +479,7 @@ enum { REQ_F_COMP_LOCKED_BIT, REQ_F_NEED_CLEANUP_BIT, REQ_F_OVERFLOW_BIT, + REQ_F_NO_FILE_TABLE_BIT, }; enum { @@ -521,6 +522,8 @@ enum { REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), /* in overflow list */ REQ_F_OVERFLOW = BIT(REQ_F_OVERFLOW_BIT), + /* doesn't need file table for this request */ + REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), }; /* @@ -711,6 +714,7 @@ static const struct io_op_def io_op_defs .needs_file = 1, .fd_non_neg = 1, .needs_fs = 1, + .file_table = 1, }, [IORING_OP_READ] = { .needs_mm = 1, @@ -2843,8 +2847,12 @@ static int io_statx(struct io_kiocb *req struct kstat stat; int ret; - if (force_nonblock) + if (force_nonblock) { + /* only need file table for an actual valid fd */ + if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) + req->flags |= REQ_F_NO_FILE_TABLE; return -EAGAIN; + } if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->how.flags)) return -EINVAL; @@ -4632,7 +4640,7 @@ static int io_grab_files(struct io_kiocb int ret = -EBADF; struct io_ring_ctx *ctx = req->ctx; - if (req->work.files) + if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) return 0; if (!ctx->ring_file) return -EBADF;