From patchwork Sun May 26 06:10:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amir Goldstein X-Patchwork-Id: 10961313 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 96B481921 for ; Sun, 26 May 2019 06:11:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8439328AB8 for ; Sun, 26 May 2019 06:11:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 78B8728A9D; Sun, 26 May 2019 06:11:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 133D028AAF for ; Sun, 26 May 2019 06:11:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727623AbfEZGLU (ORCPT ); Sun, 26 May 2019 02:11:20 -0400 Received: from mail-wr1-f67.google.com ([209.85.221.67]:44028 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726348AbfEZGLT (ORCPT ); Sun, 26 May 2019 02:11:19 -0400 Received: by mail-wr1-f67.google.com with SMTP id l17so5254301wrm.10; Sat, 25 May 2019 23:11:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=dh6NYvHDfeCra0hMJwF294oAaC7qsyBcur4kIgbRNEk=; b=SQmnIrJAyfm/WM8SeFVW6AythYAmq4t0pJiTL6QlOXStTTS5TOLrJVjl4U3LsaLZik ldsV0K3ZhgKPid3ZWhhT1TmXQEKOlfvQNfEifYLGLcr2y1eFcVl4+TaCh273xyRKr8T2 bQFUWZOkzsiQUB1ey2ENVev3UjlBODJEQkcoRPaKIKIJ+2ac4La11Uit01ngeqxHBOkL nfn4t37Mhm2oLTZ+QjUb4SmAgcWJ8YHx8rNbonX+3yjVDUBKiQEwdJItTh9q9CyJ1BhN JJi4rIFJAzKJPUBiR/wKrOJqI4nM8PXbPa0XyCjgs3pgidKMYxmZYfP031WwcehdZ96r yCsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=dh6NYvHDfeCra0hMJwF294oAaC7qsyBcur4kIgbRNEk=; b=g1wcCZEdY22JfHIpLB7dGprCTur3cRJ0oe9yM5/nz+gulnK7J2nv7RSt0F0Hy50S66 RGTgZGwVwiSGkFiqRlnFdXYjqWiVMImh6Vg4JBdPgjx+uSGBgDA5t2Y2yc1lLixW/K8W POA8ZieW4kG2Q/Rubkupk5wYjWZHujLFnOGrhc3XWH+BUm4NrVLNcYusNskTfur2DYQY zGuaWf17i/VkcFdrA5rVa7NILp5c//Jdz+UBGqdBjXU7yHZk3Tf+2hSBgYqN3tfDWlS5 zCzv+YrQU/WGoCsrF8OGOj6YsP/ZmtstroGMBRCyZSXY5soPoL2XBj3NcoCxE+LX9QRR a4oA== X-Gm-Message-State: APjAAAW9pD7YIcZHi0GRdWiZvRVY2Q1K2P9dwuv9gDnpOOU+GCy7rqt4 P4+o0R2B6LT0gpQkuPzmi1c= X-Google-Smtp-Source: APXvYqz+luHf4urr3DGcHaQp4SwKfS/0Q8U0BnzJGTZtBr1n9gYknnidfMnuqeWr5nBjV1crTjqdfw== X-Received: by 2002:adf:c188:: with SMTP id x8mr6450128wre.256.1558851077351; Sat, 25 May 2019 23:11:17 -0700 (PDT) Received: from localhost.localdomain ([5.102.238.208]) by smtp.gmail.com with ESMTPSA id a124sm5302943wmh.3.2019.05.25.23.11.15 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 25 May 2019 23:11:16 -0700 (PDT) From: Amir Goldstein To: "Darrick J . Wong" Cc: Dave Chinner , Christoph Hellwig , Olga Kornievskaia , Luis Henriques , Al Viro , linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH v2 3/8] vfs: introduce generic_file_rw_checks() Date: Sun, 26 May 2019 09:10:54 +0300 Message-Id: <20190526061100.21761-4-amir73il@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190526061100.21761-1-amir73il@gmail.com> References: <20190526061100.21761-1-amir73il@gmail.com> Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Factor out helper with some checks on in/out file that are common to clone_file_range and copy_file_range. Suggested-by: Darrick J. Wong Signed-off-by: Amir Goldstein Reviewed-by: Darrick J. Wong --- fs/read_write.c | 38 +++++++++++--------------------------- include/linux/fs.h | 1 + mm/filemap.c | 24 ++++++++++++++++++++++++ 3 files changed, 36 insertions(+), 27 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index b63dcb4e4fe9..f1900bdb3127 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1617,17 +1617,18 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len, unsigned int flags) { - struct inode *inode_in = file_inode(file_in); - struct inode *inode_out = file_inode(file_out); ssize_t ret; if (flags != 0) return -EINVAL; - if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) - return -EISDIR; - if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) - return -EINVAL; + /* this could be relaxed once a method supports cross-fs copies */ + if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) + return -EXDEV; + + ret = generic_file_rw_checks(file_in, file_out); + if (unlikely(ret)) + return ret; ret = rw_verify_area(READ, file_in, &pos_in, len); if (unlikely(ret)) @@ -1637,15 +1638,6 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, if (unlikely(ret)) return ret; - if (!(file_in->f_mode & FMODE_READ) || - !(file_out->f_mode & FMODE_WRITE) || - (file_out->f_flags & O_APPEND)) - return -EBADF; - - /* this could be relaxed once a method supports cross-fs copies */ - if (inode_in->i_sb != inode_out->i_sb) - return -EXDEV; - if (len == 0) return 0; @@ -2013,29 +2005,21 @@ loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t len, unsigned int remap_flags) { - struct inode *inode_in = file_inode(file_in); - struct inode *inode_out = file_inode(file_out); loff_t ret; WARN_ON_ONCE(remap_flags & REMAP_FILE_DEDUP); - if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) - return -EISDIR; - if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) - return -EINVAL; - /* * FICLONE/FICLONERANGE ioctls enforce that src and dest files are on * the same mount. Practically, they only need to be on the same file * system. */ - if (inode_in->i_sb != inode_out->i_sb) + if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) return -EXDEV; - if (!(file_in->f_mode & FMODE_READ) || - !(file_out->f_mode & FMODE_WRITE) || - (file_out->f_flags & O_APPEND)) - return -EBADF; + ret = generic_file_rw_checks(file_in, file_out); + if (ret < 0) + return ret; if (!file_in->f_op->remap_file_range) return -EOPNOTSUPP; diff --git a/include/linux/fs.h b/include/linux/fs.h index ea17858310ff..89b9b73eb581 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3049,6 +3049,7 @@ extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); extern int generic_remap_checks(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t *count, unsigned int remap_flags); +extern int generic_file_rw_checks(struct file *file_in, struct file *file_out); extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); diff --git a/mm/filemap.c b/mm/filemap.c index c5af80c43d36..798aac92cd76 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3040,6 +3040,30 @@ int generic_remap_checks(struct file *file_in, loff_t pos_in, return 0; } + +/* + * Performs common checks before doing a file copy/clone + * from @file_in to @file_out. + */ +int generic_file_rw_checks(struct file *file_in, struct file *file_out) +{ + struct inode *inode_in = file_inode(file_in); + struct inode *inode_out = file_inode(file_out); + + /* Don't copy dirs, pipes, sockets... */ + if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) + return -EISDIR; + if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) + return -EINVAL; + + if (!(file_in->f_mode & FMODE_READ) || + !(file_out->f_mode & FMODE_WRITE) || + (file_out->f_flags & O_APPEND)) + return -EBADF; + + return 0; +} + int pagecache_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata)