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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_trans_resv.h"
13#include "xfs_mount.h"
14#include "xfs_inode.h"
15#include "xfs_attr.h"
16#include "xfs_acl.h"
17#include "xfs_da_btree.h"
18
19#include <linux/posix_acl_xattr.h>
20
21
22static int
23xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
24 struct inode *inode, const char *name, void *value, size_t size)
25{
26 struct xfs_da_args args = {
27 .dp = XFS_I(inode),
28 .attr_filter = handler->flags,
29 .name = name,
30 .namelen = strlen(name),
31 .value = value,
32 .valuelen = size,
33 };
34 int error;
35
36 error = xfs_attr_get(&args);
37 if (error)
38 return error;
39 return args.valuelen;
40}
41
42static int
43xfs_xattr_set(const struct xattr_handler *handler,
44 struct user_namespace *mnt_userns, struct dentry *unused,
45 struct inode *inode, const char *name, const void *value,
46 size_t size, int flags)
47{
48 struct xfs_da_args args = {
49 .dp = XFS_I(inode),
50 .attr_filter = handler->flags,
51 .attr_flags = flags,
52 .name = name,
53 .namelen = strlen(name),
54 .value = (void *)value,
55 .valuelen = size,
56 };
57 int error;
58
59 error = xfs_attr_set(&args);
60 if (!error && (handler->flags & XFS_ATTR_ROOT))
61 xfs_forget_acl(inode, name);
62 return error;
63}
64
65static const struct xattr_handler xfs_xattr_user_handler = {
66 .prefix = XATTR_USER_PREFIX,
67 .flags = 0, /* no flags implies user namespace */
68 .get = xfs_xattr_get,
69 .set = xfs_xattr_set,
70};
71
72static const struct xattr_handler xfs_xattr_trusted_handler = {
73 .prefix = XATTR_TRUSTED_PREFIX,
74 .flags = XFS_ATTR_ROOT,
75 .get = xfs_xattr_get,
76 .set = xfs_xattr_set,
77};
78
79static const struct xattr_handler xfs_xattr_security_handler = {
80 .prefix = XATTR_SECURITY_PREFIX,
81 .flags = XFS_ATTR_SECURE,
82 .get = xfs_xattr_get,
83 .set = xfs_xattr_set,
84};
85
86const struct xattr_handler *xfs_xattr_handlers[] = {
87 &xfs_xattr_user_handler,
88 &xfs_xattr_trusted_handler,
89 &xfs_xattr_security_handler,
90#ifdef CONFIG_XFS_POSIX_ACL
91 &posix_acl_access_xattr_handler,
92 &posix_acl_default_xattr_handler,
93#endif
94 NULL
95};
96
97static void
98__xfs_xattr_put_listent(
99 struct xfs_attr_list_context *context,
100 char *prefix,
101 int prefix_len,
102 unsigned char *name,
103 int namelen)
104{
105 char *offset;
106 int arraytop;
107
108 if (context->count < 0 || context->seen_enough)
109 return;
110
111 if (!context->buffer)
112 goto compute_size;
113
114 arraytop = context->count + prefix_len + namelen + 1;
115 if (arraytop > context->firstu) {
116 context->count = -1; /* insufficient space */
117 context->seen_enough = 1;
118 return;
119 }
120 offset = context->buffer + context->count;
121 strncpy(offset, prefix, prefix_len);
122 offset += prefix_len;
123 strncpy(offset, (char *)name, namelen); /* real name */
124 offset += namelen;
125 *offset = '\0';
126
127compute_size:
128 context->count += prefix_len + namelen + 1;
129 return;
130}
131
132static void
133xfs_xattr_put_listent(
134 struct xfs_attr_list_context *context,
135 int flags,
136 unsigned char *name,
137 int namelen,
138 int valuelen)
139{
140 char *prefix;
141 int prefix_len;
142
143 ASSERT(context->count >= 0);
144
145 if (flags & XFS_ATTR_ROOT) {
146#ifdef CONFIG_XFS_POSIX_ACL
147 if (namelen == SGI_ACL_FILE_SIZE &&
148 strncmp(name, SGI_ACL_FILE,
149 SGI_ACL_FILE_SIZE) == 0) {
150 __xfs_xattr_put_listent(
151 context, XATTR_SYSTEM_PREFIX,
152 XATTR_SYSTEM_PREFIX_LEN,
153 XATTR_POSIX_ACL_ACCESS,
154 strlen(XATTR_POSIX_ACL_ACCESS));
155 } else if (namelen == SGI_ACL_DEFAULT_SIZE &&
156 strncmp(name, SGI_ACL_DEFAULT,
157 SGI_ACL_DEFAULT_SIZE) == 0) {
158 __xfs_xattr_put_listent(
159 context, XATTR_SYSTEM_PREFIX,
160 XATTR_SYSTEM_PREFIX_LEN,
161 XATTR_POSIX_ACL_DEFAULT,
162 strlen(XATTR_POSIX_ACL_DEFAULT));
163 }
164#endif
165
166 /*
167 * Only show root namespace entries if we are actually allowed to
168 * see them.
169 */
170 if (!capable(CAP_SYS_ADMIN))
171 return;
172
173 prefix = XATTR_TRUSTED_PREFIX;
174 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
175 } else if (flags & XFS_ATTR_SECURE) {
176 prefix = XATTR_SECURITY_PREFIX;
177 prefix_len = XATTR_SECURITY_PREFIX_LEN;
178 } else {
179 prefix = XATTR_USER_PREFIX;
180 prefix_len = XATTR_USER_PREFIX_LEN;
181 }
182
183 __xfs_xattr_put_listent(context, prefix, prefix_len, name,
184 namelen);
185 return;
186}
187
188ssize_t
189xfs_vn_listxattr(
190 struct dentry *dentry,
191 char *data,
192 size_t size)
193{
194 struct xfs_attr_list_context context;
195 struct inode *inode = d_inode(dentry);
196 int error;
197
198 /*
199 * First read the regular on-disk attributes.
200 */
201 memset(&context, 0, sizeof(context));
202 context.dp = XFS_I(inode);
203 context.resynch = 1;
204 context.buffer = size ? data : NULL;
205 context.bufsize = size;
206 context.firstu = context.bufsize;
207 context.put_listent = xfs_xattr_put_listent;
208
209 error = xfs_attr_list(&context);
210 if (error)
211 return error;
212 if (context.count < 0)
213 return -ERANGE;
214
215 return context.count;
216}
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}