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Lachlan McIlroyf9e09f02008-06-23 13:34:09 +10001/*
2 * Copyright (C) 2008 Christoph Hellwig.
3 * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "xfs.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110020#include "xfs_format.h"
Dave Chinner69432832013-08-12 20:49:23 +100021#include "xfs_log_format.h"
Dave Chinner239880e2013-10-23 10:50:10 +110022#include "xfs_trans_resv.h"
Dave Chinner57062782013-10-15 09:17:51 +110023#include "xfs_mount.h"
24#include "xfs_da_format.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100025#include "xfs_inode.h"
26#include "xfs_attr.h"
27#include "xfs_attr_leaf.h"
28#include "xfs_acl.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100029
30#include <linux/posix_acl_xattr.h>
31#include <linux/xattr.h>
32
33
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100034static int
Al Virob2968212016-04-10 20:48:24 -040035xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
36 struct inode *inode, const char *name, void *value, size_t size)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100037{
Andreas Gruenbacherd9a82a02015-10-04 19:18:51 +020038 int xflags = handler->flags;
Al Virob2968212016-04-10 20:48:24 -040039 struct xfs_inode *ip = XFS_I(inode);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100040 int error, asize = size;
41
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100042 /* Convert Linux syscall to XFS internal ATTR flags */
43 if (!size) {
44 xflags |= ATTR_KERNOVAL;
45 value = NULL;
46 }
47
Dave Chinner24513372014-06-25 14:58:08 +100048 error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100049 if (error)
50 return error;
51 return asize;
52}
53
Andreas Gruenbacher47e1bf62015-11-03 12:56:17 +110054void
55xfs_forget_acl(
56 struct inode *inode,
57 const char *name,
58 int xflags)
59{
60 /*
61 * Invalidate any cached ACLs if the user has bypassed the ACL
62 * interface. We don't validate the content whatsoever so it is caller
63 * responsibility to provide data in valid format and ensure i_mode is
64 * consistent.
65 */
66 if (xflags & ATTR_ROOT) {
67#ifdef CONFIG_XFS_POSIX_ACL
68 if (!strcmp(name, SGI_ACL_FILE))
69 forget_cached_acl(inode, ACL_TYPE_ACCESS);
70 else if (!strcmp(name, SGI_ACL_DEFAULT))
71 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
72#endif
73 }
74}
75
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100076static int
Al Viro59301222016-05-27 10:19:30 -040077xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
78 struct inode *inode, const char *name, const void *value,
79 size_t size, int flags)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100080{
Linus Torvalds5d2eb542015-11-13 18:02:30 -080081 int xflags = handler->flags;
Al Viro59301222016-05-27 10:19:30 -040082 struct xfs_inode *ip = XFS_I(inode);
Brian Foster67d8e042015-11-03 12:40:59 +110083 int error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100084
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100085 /* Convert Linux syscall to XFS internal ATTR flags */
86 if (flags & XATTR_CREATE)
87 xflags |= ATTR_CREATE;
88 if (flags & XATTR_REPLACE)
89 xflags |= ATTR_REPLACE;
90
91 if (!value)
Dave Chinner24513372014-06-25 14:58:08 +100092 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
Brian Foster67d8e042015-11-03 12:40:59 +110093 error = xfs_attr_set(ip, (unsigned char *)name,
Dave Chinnera9273ca2010-01-20 10:47:48 +110094 (void *)value, size, xflags);
Andreas Gruenbacher47e1bf62015-11-03 12:56:17 +110095 if (!error)
Al Viro59301222016-05-27 10:19:30 -040096 xfs_forget_acl(inode, name, xflags);
Brian Foster67d8e042015-11-03 12:40:59 +110097
98 return error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100099}
100
Stephen Hemminger46e58762010-05-13 17:53:20 -0700101static const struct xattr_handler xfs_xattr_user_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000102 .prefix = XATTR_USER_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000103 .flags = 0, /* no flags implies user namespace */
104 .get = xfs_xattr_get,
105 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000106};
107
Stephen Hemminger46e58762010-05-13 17:53:20 -0700108static const struct xattr_handler xfs_xattr_trusted_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000109 .prefix = XATTR_TRUSTED_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000110 .flags = ATTR_ROOT,
111 .get = xfs_xattr_get,
112 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000113};
114
Stephen Hemminger46e58762010-05-13 17:53:20 -0700115static const struct xattr_handler xfs_xattr_security_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000116 .prefix = XATTR_SECURITY_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000117 .flags = ATTR_SECURE,
118 .get = xfs_xattr_get,
119 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000120};
121
Stephen Hemminger46e58762010-05-13 17:53:20 -0700122const struct xattr_handler *xfs_xattr_handlers[] = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000123 &xfs_xattr_user_handler,
124 &xfs_xattr_trusted_handler,
125 &xfs_xattr_security_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200126#ifdef CONFIG_XFS_POSIX_ACL
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800127 &posix_acl_access_xattr_handler,
128 &posix_acl_default_xattr_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200129#endif
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000130 NULL
131};
132
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100133static int
134__xfs_xattr_put_listent(
135 struct xfs_attr_list_context *context,
136 char *prefix,
137 int prefix_len,
138 unsigned char *name,
139 int namelen)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000140{
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100141 char *offset;
142 int arraytop;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000143
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100144 if (!context->alist)
145 goto compute_size;
146
147 arraytop = context->count + prefix_len + namelen + 1;
148 if (arraytop > context->firstu) {
149 context->count = -1; /* insufficient space */
Eric Sandeen2a6fba62016-04-06 07:57:18 +1000150 return 0;
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100151 }
152 offset = (char *)context->alist + context->count;
153 strncpy(offset, prefix, prefix_len);
154 offset += prefix_len;
155 strncpy(offset, (char *)name, namelen); /* real name */
156 offset += namelen;
157 *offset = '\0';
158
159compute_size:
160 context->count += prefix_len + namelen + 1;
161 return 0;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000162}
163
164static int
Dave Chinnera9273ca2010-01-20 10:47:48 +1100165xfs_xattr_put_listent(
166 struct xfs_attr_list_context *context,
167 int flags,
168 unsigned char *name,
169 int namelen,
Eric Sandeene5bd12b2016-04-06 07:57:32 +1000170 int valuelen)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000171{
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100172 char *prefix;
173 int prefix_len;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000174
175 ASSERT(context->count >= 0);
176
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100177 if (flags & XFS_ATTR_ROOT) {
178#ifdef CONFIG_XFS_POSIX_ACL
179 if (namelen == SGI_ACL_FILE_SIZE &&
180 strncmp(name, SGI_ACL_FILE,
181 SGI_ACL_FILE_SIZE) == 0) {
182 int ret = __xfs_xattr_put_listent(
183 context, XATTR_SYSTEM_PREFIX,
184 XATTR_SYSTEM_PREFIX_LEN,
185 XATTR_POSIX_ACL_ACCESS,
186 strlen(XATTR_POSIX_ACL_ACCESS));
187 if (ret)
188 return ret;
189 } else if (namelen == SGI_ACL_DEFAULT_SIZE &&
190 strncmp(name, SGI_ACL_DEFAULT,
191 SGI_ACL_DEFAULT_SIZE) == 0) {
192 int ret = __xfs_xattr_put_listent(
193 context, XATTR_SYSTEM_PREFIX,
194 XATTR_SYSTEM_PREFIX_LEN,
195 XATTR_POSIX_ACL_DEFAULT,
196 strlen(XATTR_POSIX_ACL_DEFAULT));
197 if (ret)
198 return ret;
199 }
200#endif
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000201
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100202 /*
203 * Only show root namespace entries if we are actually allowed to
204 * see them.
205 */
206 if (!capable(CAP_SYS_ADMIN))
207 return 0;
208
209 prefix = XATTR_TRUSTED_PREFIX;
210 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
211 } else if (flags & XFS_ATTR_SECURE) {
212 prefix = XATTR_SECURITY_PREFIX;
213 prefix_len = XATTR_SECURITY_PREFIX_LEN;
214 } else {
215 prefix = XATTR_USER_PREFIX;
216 prefix_len = XATTR_USER_PREFIX_LEN;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000217 }
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000218
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100219 return __xfs_xattr_put_listent(context, prefix, prefix_len, name,
220 namelen);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000221}
222
223ssize_t
Eric Sandeen2a6fba62016-04-06 07:57:18 +1000224xfs_vn_listxattr(
225 struct dentry *dentry,
226 char *data,
227 size_t size)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000228{
229 struct xfs_attr_list_context context;
230 struct attrlist_cursor_kern cursor = { 0 };
Eric Sandeen2a6fba62016-04-06 07:57:18 +1000231 struct inode *inode = d_inode(dentry);
232 int error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000233
234 /*
235 * First read the regular on-disk attributes.
236 */
237 memset(&context, 0, sizeof(context));
238 context.dp = XFS_I(inode);
239 context.cursor = &cursor;
240 context.resynch = 1;
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100241 context.alist = size ? data : NULL;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000242 context.bufsize = size;
243 context.firstu = context.bufsize;
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100244 context.put_listent = xfs_xattr_put_listent;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000245
Eric Sandeen2a6fba62016-04-06 07:57:18 +1000246 error = xfs_attr_list_int(&context);
247 if (error)
248 return error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000249 if (context.count < 0)
250 return -ERANGE;
251
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000252 return context.count;
253}