From patchwork Wed Dec 2 13:44:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Gruenbacher X-Patchwork-Id: 7746161 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8D457BEEE1 for ; Wed, 2 Dec 2015 13:47:14 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9DBD6205E1 for ; Wed, 2 Dec 2015 13:47:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F0679205CD for ; Wed, 2 Dec 2015 13:47:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758291AbbLBNpL (ORCPT ); Wed, 2 Dec 2015 08:45:11 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60634 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751894AbbLBNpK (ORCPT ); Wed, 2 Dec 2015 08:45:10 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id ED91AC0CC62E; Wed, 2 Dec 2015 13:45:09 +0000 (UTC) Received: from nux.redhat.com (vpn1-7-96.ams2.redhat.com [10.36.7.96]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id tB2DihWF001336; Wed, 2 Dec 2015 08:45:06 -0500 From: Andreas Gruenbacher To: Alexander Viro , Christoph Hellwig , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Andreas Gruenbacher , Hugh Dickins , linux-mm@kvack.org Subject: [PATCH v2 07/11] tmpfs: listxattr should include POSIX ACL xattrs Date: Wed, 2 Dec 2015 14:44:39 +0100 Message-Id: <1449063883-22097-8-git-send-email-agruenba@redhat.com> In-Reply-To: <1449063883-22097-1-git-send-email-agruenba@redhat.com> References: <1449063883-22097-1-git-send-email-agruenba@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When a file on tmpfs has an ACL or a Default ACL, listxattr should include the corresponding xattr name. Signed-off-by: Andreas Gruenbacher Reviewed-by: James Morris Cc: Hugh Dickins Cc: linux-mm@kvack.org --- fs/kernfs/inode.c | 2 +- fs/xattr.c | 53 +++++++++++++++++++++++++++++++++++---------------- include/linux/xattr.h | 3 ++- mm/shmem.c | 2 +- 4 files changed, 41 insertions(+), 19 deletions(-) diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c index f97e1f7..16405ae 100644 --- a/fs/kernfs/inode.c +++ b/fs/kernfs/inode.c @@ -230,7 +230,7 @@ ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size) if (!attrs) return -ENOMEM; - return simple_xattr_list(&attrs->xattrs, buf, size); + return simple_xattr_list(d_inode(dentry), &attrs->xattrs, buf, size); } static inline void set_default_inode_attr(struct inode *inode, umode_t mode) diff --git a/fs/xattr.c b/fs/xattr.c index 4ef8b37..c3af6c9 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -921,38 +921,59 @@ static bool xattr_is_trusted(const char *name) return !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN); } +static int xattr_list_one(char **buffer, ssize_t *remaining_size, + const char *name) +{ + size_t len = strlen(name) + 1; + if (*buffer) { + if (*remaining_size < len) + return -ERANGE; + memcpy(*buffer, name, len); + *buffer += len; + } + *remaining_size -= len; + return 0; +} + /* * xattr LIST operation for in-memory/pseudo filesystems */ -ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer, - size_t size) +ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, + char *buffer, size_t size) { bool trusted = capable(CAP_SYS_ADMIN); struct simple_xattr *xattr; - size_t used = 0; + ssize_t remaining_size = size; + int err; + +#ifdef CONFIG_FS_POSIX_ACL + if (inode->i_acl) { + err = xattr_list_one(&buffer, &remaining_size, + XATTR_NAME_POSIX_ACL_ACCESS); + if (err) + return err; + } + if (inode->i_default_acl) { + err = xattr_list_one(&buffer, &remaining_size, + XATTR_NAME_POSIX_ACL_DEFAULT); + if (err) + return err; + } +#endif spin_lock(&xattrs->lock); list_for_each_entry(xattr, &xattrs->head, list) { - size_t len; - /* skip "trusted." attributes for unprivileged callers */ if (!trusted && xattr_is_trusted(xattr->name)) continue; - len = strlen(xattr->name) + 1; - used += len; - if (buffer) { - if (size < used) { - used = -ERANGE; - break; - } - memcpy(buffer, xattr->name, len); - buffer += len; - } + err = xattr_list_one(&buffer, &remaining_size, xattr->name); + if (err) + return err; } spin_unlock(&xattrs->lock); - return used; + return size - remaining_size; } /* diff --git a/include/linux/xattr.h b/include/linux/xattr.h index 704c016..c549feb 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -104,7 +104,8 @@ int simple_xattr_get(struct simple_xattrs *xattrs, const char *name, void *buffer, size_t size); int simple_xattr_set(struct simple_xattrs *xattrs, const char *name, const void *value, size_t size, int flags); -ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer, size_t size); +ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer, + size_t size); void simple_xattr_list_add(struct simple_xattrs *xattrs, struct simple_xattr *new_xattr); diff --git a/mm/shmem.c b/mm/shmem.c index fdfe6c8..297390f 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2606,7 +2606,7 @@ static const struct xattr_handler *shmem_xattr_handlers[] = { static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size) { struct shmem_inode_info *info = SHMEM_I(d_inode(dentry)); - return simple_xattr_list(&info->xattrs, buffer, size); + return simple_xattr_list(d_inode(dentry), &info->xattrs, buffer, size); } #endif /* CONFIG_TMPFS_XATTR */