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1/*
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"
20#include "xfs_format.h"
21#include "xfs_log_format.h"
22#include "xfs_trans_resv.h"
23#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_mount.h"
26#include "xfs_da_format.h"
27#include "xfs_inode.h"
28#include "xfs_attr.h"
29#include "xfs_attr_leaf.h"
30#include "xfs_acl.h"
31
32#include <linux/posix_acl_xattr.h>
33#include <linux/xattr.h>
34
35
36static int
37xfs_xattr_get(struct dentry *dentry, const char *name,
38 void *value, size_t size, int xflags)
39{
40 struct xfs_inode *ip = XFS_I(dentry->d_inode);
41 int error, asize = size;
42
43 if (strcmp(name, "") == 0)
44 return -EINVAL;
45
46 /* Convert Linux syscall to XFS internal ATTR flags */
47 if (!size) {
48 xflags |= ATTR_KERNOVAL;
49 value = NULL;
50 }
51
52 error = -xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
53 if (error)
54 return error;
55 return asize;
56}
57
58static int
59xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
60 size_t size, int flags, int xflags)
61{
62 struct xfs_inode *ip = XFS_I(dentry->d_inode);
63
64 if (strcmp(name, "") == 0)
65 return -EINVAL;
66
67 /* Convert Linux syscall to XFS internal ATTR flags */
68 if (flags & XATTR_CREATE)
69 xflags |= ATTR_CREATE;
70 if (flags & XATTR_REPLACE)
71 xflags |= ATTR_REPLACE;
72
73 if (!value)
74 return -xfs_attr_remove(ip, (unsigned char *)name, xflags);
75 return -xfs_attr_set(ip, (unsigned char *)name,
76 (void *)value, size, xflags);
77}
78
79static const struct xattr_handler xfs_xattr_user_handler = {
80 .prefix = XATTR_USER_PREFIX,
81 .flags = 0, /* no flags implies user namespace */
82 .get = xfs_xattr_get,
83 .set = xfs_xattr_set,
84};
85
86static const struct xattr_handler xfs_xattr_trusted_handler = {
87 .prefix = XATTR_TRUSTED_PREFIX,
88 .flags = ATTR_ROOT,
89 .get = xfs_xattr_get,
90 .set = xfs_xattr_set,
91};
92
93static const struct xattr_handler xfs_xattr_security_handler = {
94 .prefix = XATTR_SECURITY_PREFIX,
95 .flags = ATTR_SECURE,
96 .get = xfs_xattr_get,
97 .set = xfs_xattr_set,
98};
99
100const struct xattr_handler *xfs_xattr_handlers[] = {
101 &xfs_xattr_user_handler,
102 &xfs_xattr_trusted_handler,
103 &xfs_xattr_security_handler,
104#ifdef CONFIG_XFS_POSIX_ACL
105 &posix_acl_access_xattr_handler,
106 &posix_acl_default_xattr_handler,
107#endif
108 NULL
109};
110
111static unsigned int xfs_xattr_prefix_len(int flags)
112{
113 if (flags & XFS_ATTR_SECURE)
114 return sizeof("security");
115 else if (flags & XFS_ATTR_ROOT)
116 return sizeof("trusted");
117 else
118 return sizeof("user");
119}
120
121static const char *xfs_xattr_prefix(int flags)
122{
123 if (flags & XFS_ATTR_SECURE)
124 return xfs_xattr_security_handler.prefix;
125 else if (flags & XFS_ATTR_ROOT)
126 return xfs_xattr_trusted_handler.prefix;
127 else
128 return xfs_xattr_user_handler.prefix;
129}
130
131static int
132xfs_xattr_put_listent(
133 struct xfs_attr_list_context *context,
134 int flags,
135 unsigned char *name,
136 int namelen,
137 int valuelen,
138 unsigned char *value)
139{
140 unsigned int prefix_len = xfs_xattr_prefix_len(flags);
141 char *offset;
142 int arraytop;
143
144 ASSERT(context->count >= 0);
145
146 /*
147 * Only show root namespace entries if we are actually allowed to
148 * see them.
149 */
150 if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
151 return 0;
152
153 arraytop = context->count + prefix_len + namelen + 1;
154 if (arraytop > context->firstu) {
155 context->count = -1; /* insufficient space */
156 return 1;
157 }
158 offset = (char *)context->alist + context->count;
159 strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
160 offset += prefix_len;
161 strncpy(offset, (char *)name, namelen); /* real name */
162 offset += namelen;
163 *offset = '\0';
164 context->count += prefix_len + namelen + 1;
165 return 0;
166}
167
168static int
169xfs_xattr_put_listent_sizes(
170 struct xfs_attr_list_context *context,
171 int flags,
172 unsigned char *name,
173 int namelen,
174 int valuelen,
175 unsigned char *value)
176{
177 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
178 return 0;
179}
180
181static int
182list_one_attr(const char *name, const size_t len, void *data,
183 size_t size, ssize_t *result)
184{
185 char *p = data + *result;
186
187 *result += len;
188 if (!size)
189 return 0;
190 if (*result > size)
191 return -ERANGE;
192
193 strcpy(p, name);
194 return 0;
195}
196
197ssize_t
198xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
199{
200 struct xfs_attr_list_context context;
201 struct attrlist_cursor_kern cursor = { 0 };
202 struct inode *inode = dentry->d_inode;
203 int error;
204
205 /*
206 * First read the regular on-disk attributes.
207 */
208 memset(&context, 0, sizeof(context));
209 context.dp = XFS_I(inode);
210 context.cursor = &cursor;
211 context.resynch = 1;
212 context.alist = data;
213 context.bufsize = size;
214 context.firstu = context.bufsize;
215
216 if (size)
217 context.put_listent = xfs_xattr_put_listent;
218 else
219 context.put_listent = xfs_xattr_put_listent_sizes;
220
221 xfs_attr_list_int(&context);
222 if (context.count < 0)
223 return -ERANGE;
224
225 /*
226 * Then add the two synthetic ACL attributes.
227 */
228 if (posix_acl_access_exists(inode)) {
229 error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
230 strlen(POSIX_ACL_XATTR_ACCESS) + 1,
231 data, size, &context.count);
232 if (error)
233 return error;
234 }
235
236 if (posix_acl_default_exists(inode)) {
237 error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
238 strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
239 data, size, &context.count);
240 if (error)
241 return error;
242 }
243
244 return context.count;
245}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2008 Christoph Hellwig.
4 * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
5 */
6
7#include "xfs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_da_format.h"
12#include "xfs_inode.h"
13#include "xfs_attr.h"
14#include "xfs_acl.h"
15#include "xfs_da_btree.h"
16
17#include <linux/posix_acl_xattr.h>
18
19
20static int
21xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
22 struct inode *inode, const char *name, void *value, size_t size)
23{
24 struct xfs_da_args args = {
25 .dp = XFS_I(inode),
26 .attr_filter = handler->flags,
27 .name = name,
28 .namelen = strlen(name),
29 .value = value,
30 .valuelen = size,
31 };
32 int error;
33
34 error = xfs_attr_get(&args);
35 if (error)
36 return error;
37 return args.valuelen;
38}
39
40static int
41xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
42 struct inode *inode, const char *name, const void *value,
43 size_t size, int flags)
44{
45 struct xfs_da_args args = {
46 .dp = XFS_I(inode),
47 .attr_filter = handler->flags,
48 .attr_flags = flags,
49 .name = name,
50 .namelen = strlen(name),
51 .value = (void *)value,
52 .valuelen = size,
53 };
54 int error;
55
56 error = xfs_attr_set(&args);
57 if (!error && (handler->flags & XFS_ATTR_ROOT))
58 xfs_forget_acl(inode, name);
59 return error;
60}
61
62static const struct xattr_handler xfs_xattr_user_handler = {
63 .prefix = XATTR_USER_PREFIX,
64 .flags = 0, /* no flags implies user namespace */
65 .get = xfs_xattr_get,
66 .set = xfs_xattr_set,
67};
68
69static const struct xattr_handler xfs_xattr_trusted_handler = {
70 .prefix = XATTR_TRUSTED_PREFIX,
71 .flags = XFS_ATTR_ROOT,
72 .get = xfs_xattr_get,
73 .set = xfs_xattr_set,
74};
75
76static const struct xattr_handler xfs_xattr_security_handler = {
77 .prefix = XATTR_SECURITY_PREFIX,
78 .flags = XFS_ATTR_SECURE,
79 .get = xfs_xattr_get,
80 .set = xfs_xattr_set,
81};
82
83const struct xattr_handler *xfs_xattr_handlers[] = {
84 &xfs_xattr_user_handler,
85 &xfs_xattr_trusted_handler,
86 &xfs_xattr_security_handler,
87#ifdef CONFIG_XFS_POSIX_ACL
88 &posix_acl_access_xattr_handler,
89 &posix_acl_default_xattr_handler,
90#endif
91 NULL
92};
93
94static void
95__xfs_xattr_put_listent(
96 struct xfs_attr_list_context *context,
97 char *prefix,
98 int prefix_len,
99 unsigned char *name,
100 int namelen)
101{
102 char *offset;
103 int arraytop;
104
105 if (context->count < 0 || context->seen_enough)
106 return;
107
108 if (!context->buffer)
109 goto compute_size;
110
111 arraytop = context->count + prefix_len + namelen + 1;
112 if (arraytop > context->firstu) {
113 context->count = -1; /* insufficient space */
114 context->seen_enough = 1;
115 return;
116 }
117 offset = context->buffer + context->count;
118 strncpy(offset, prefix, prefix_len);
119 offset += prefix_len;
120 strncpy(offset, (char *)name, namelen); /* real name */
121 offset += namelen;
122 *offset = '\0';
123
124compute_size:
125 context->count += prefix_len + namelen + 1;
126 return;
127}
128
129static void
130xfs_xattr_put_listent(
131 struct xfs_attr_list_context *context,
132 int flags,
133 unsigned char *name,
134 int namelen,
135 int valuelen)
136{
137 char *prefix;
138 int prefix_len;
139
140 ASSERT(context->count >= 0);
141
142 if (flags & XFS_ATTR_ROOT) {
143#ifdef CONFIG_XFS_POSIX_ACL
144 if (namelen == SGI_ACL_FILE_SIZE &&
145 strncmp(name, SGI_ACL_FILE,
146 SGI_ACL_FILE_SIZE) == 0) {
147 __xfs_xattr_put_listent(
148 context, XATTR_SYSTEM_PREFIX,
149 XATTR_SYSTEM_PREFIX_LEN,
150 XATTR_POSIX_ACL_ACCESS,
151 strlen(XATTR_POSIX_ACL_ACCESS));
152 } else if (namelen == SGI_ACL_DEFAULT_SIZE &&
153 strncmp(name, SGI_ACL_DEFAULT,
154 SGI_ACL_DEFAULT_SIZE) == 0) {
155 __xfs_xattr_put_listent(
156 context, XATTR_SYSTEM_PREFIX,
157 XATTR_SYSTEM_PREFIX_LEN,
158 XATTR_POSIX_ACL_DEFAULT,
159 strlen(XATTR_POSIX_ACL_DEFAULT));
160 }
161#endif
162
163 /*
164 * Only show root namespace entries if we are actually allowed to
165 * see them.
166 */
167 if (!capable(CAP_SYS_ADMIN))
168 return;
169
170 prefix = XATTR_TRUSTED_PREFIX;
171 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
172 } else if (flags & XFS_ATTR_SECURE) {
173 prefix = XATTR_SECURITY_PREFIX;
174 prefix_len = XATTR_SECURITY_PREFIX_LEN;
175 } else {
176 prefix = XATTR_USER_PREFIX;
177 prefix_len = XATTR_USER_PREFIX_LEN;
178 }
179
180 __xfs_xattr_put_listent(context, prefix, prefix_len, name,
181 namelen);
182 return;
183}
184
185ssize_t
186xfs_vn_listxattr(
187 struct dentry *dentry,
188 char *data,
189 size_t size)
190{
191 struct xfs_attr_list_context context;
192 struct inode *inode = d_inode(dentry);
193 int error;
194
195 /*
196 * First read the regular on-disk attributes.
197 */
198 memset(&context, 0, sizeof(context));
199 context.dp = XFS_I(inode);
200 context.resynch = 1;
201 context.buffer = size ? data : NULL;
202 context.bufsize = size;
203 context.firstu = context.bufsize;
204 context.put_listent = xfs_xattr_put_listent;
205
206 error = xfs_attr_list(&context);
207 if (error)
208 return error;
209 if (context.count < 0)
210 return -ERANGE;
211
212 return context.count;
213}