xfs: Plug memory leak in xfs_attrmulti_attr_set
[deliverable/linux.git] / fs / xfs / xfs_xattr.c
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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"
a4fbe6ab 20#include "xfs_format.h"
69432832 21#include "xfs_log_format.h"
239880ef 22#include "xfs_trans_resv.h"
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23#include "xfs_mount.h"
24#include "xfs_da_format.h"
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25#include "xfs_inode.h"
26#include "xfs_attr.h"
27#include "xfs_attr_leaf.h"
28#include "xfs_acl.h"
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29
30#include <linux/posix_acl_xattr.h>
31#include <linux/xattr.h>
32
33
f9e09f09 34static int
431547b3 35xfs_xattr_get(struct dentry *dentry, const char *name,
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36 void *value, size_t size, int xflags)
37{
2b0143b5 38 struct xfs_inode *ip = XFS_I(d_inode(dentry));
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39 int error, asize = size;
40
41 if (strcmp(name, "") == 0)
42 return -EINVAL;
43
44 /* Convert Linux syscall to XFS internal ATTR flags */
45 if (!size) {
46 xflags |= ATTR_KERNOVAL;
47 value = NULL;
48 }
49
2451337d 50 error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
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51 if (error)
52 return error;
53 return asize;
54}
55
56static int
431547b3 57xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
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58 size_t size, int flags, int xflags)
59{
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60 struct xfs_inode *ip = XFS_I(d_inode(dentry));
61 int error;
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62
63 if (strcmp(name, "") == 0)
64 return -EINVAL;
65
66 /* Convert Linux syscall to XFS internal ATTR flags */
67 if (flags & XATTR_CREATE)
68 xflags |= ATTR_CREATE;
69 if (flags & XATTR_REPLACE)
70 xflags |= ATTR_REPLACE;
71
72 if (!value)
2451337d 73 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
67d8e04e 74 error = xfs_attr_set(ip, (unsigned char *)name,
a9273ca5 75 (void *)value, size, xflags);
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76 /*
77 * Invalidate any cached ACLs if the user has bypassed the ACL
78 * interface. We don't validate the content whatsoever so it is caller
79 * responsibility to provide data in valid format and ensure i_mode is
80 * consistent.
81 */
82#ifdef CONFIG_XFS_POSIX_ACL
83 if (!error && (xflags & ATTR_ROOT)) {
84 if (!strcmp(name, SGI_ACL_FILE))
85 forget_cached_acl(VFS_I(ip), ACL_TYPE_ACCESS);
86 else if (!strcmp(name, SGI_ACL_DEFAULT))
87 forget_cached_acl(VFS_I(ip), ACL_TYPE_DEFAULT);
88 }
89#endif
90
91 return error;
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92}
93
46e58764 94static const struct xattr_handler xfs_xattr_user_handler = {
f9e09f09 95 .prefix = XATTR_USER_PREFIX,
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96 .flags = 0, /* no flags implies user namespace */
97 .get = xfs_xattr_get,
98 .set = xfs_xattr_set,
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99};
100
46e58764 101static const struct xattr_handler xfs_xattr_trusted_handler = {
f9e09f09 102 .prefix = XATTR_TRUSTED_PREFIX,
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103 .flags = ATTR_ROOT,
104 .get = xfs_xattr_get,
105 .set = xfs_xattr_set,
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106};
107
46e58764 108static const struct xattr_handler xfs_xattr_security_handler = {
f9e09f09 109 .prefix = XATTR_SECURITY_PREFIX,
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110 .flags = ATTR_SECURE,
111 .get = xfs_xattr_get,
112 .set = xfs_xattr_set,
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113};
114
46e58764 115const struct xattr_handler *xfs_xattr_handlers[] = {
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116 &xfs_xattr_user_handler,
117 &xfs_xattr_trusted_handler,
118 &xfs_xattr_security_handler,
ef14f0c1 119#ifdef CONFIG_XFS_POSIX_ACL
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120 &posix_acl_access_xattr_handler,
121 &posix_acl_default_xattr_handler,
ef14f0c1 122#endif
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123 NULL
124};
125
126static unsigned int xfs_xattr_prefix_len(int flags)
127{
128 if (flags & XFS_ATTR_SECURE)
129 return sizeof("security");
130 else if (flags & XFS_ATTR_ROOT)
131 return sizeof("trusted");
132 else
133 return sizeof("user");
134}
135
136static const char *xfs_xattr_prefix(int flags)
137{
138 if (flags & XFS_ATTR_SECURE)
139 return xfs_xattr_security_handler.prefix;
140 else if (flags & XFS_ATTR_ROOT)
141 return xfs_xattr_trusted_handler.prefix;
142 else
143 return xfs_xattr_user_handler.prefix;
144}
145
146static int
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147xfs_xattr_put_listent(
148 struct xfs_attr_list_context *context,
149 int flags,
150 unsigned char *name,
151 int namelen,
152 int valuelen,
153 unsigned char *value)
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154{
155 unsigned int prefix_len = xfs_xattr_prefix_len(flags);
156 char *offset;
157 int arraytop;
158
159 ASSERT(context->count >= 0);
160
161 /*
162 * Only show root namespace entries if we are actually allowed to
163 * see them.
164 */
165 if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
166 return 0;
167
168 arraytop = context->count + prefix_len + namelen + 1;
169 if (arraytop > context->firstu) {
170 context->count = -1; /* insufficient space */
171 return 1;
172 }
173 offset = (char *)context->alist + context->count;
174 strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
175 offset += prefix_len;
a9273ca5 176 strncpy(offset, (char *)name, namelen); /* real name */
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177 offset += namelen;
178 *offset = '\0';
179 context->count += prefix_len + namelen + 1;
180 return 0;
181}
182
183static int
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184xfs_xattr_put_listent_sizes(
185 struct xfs_attr_list_context *context,
186 int flags,
187 unsigned char *name,
188 int namelen,
189 int valuelen,
190 unsigned char *value)
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191{
192 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
193 return 0;
194}
195
196static int
197list_one_attr(const char *name, const size_t len, void *data,
198 size_t size, ssize_t *result)
199{
200 char *p = data + *result;
201
202 *result += len;
203 if (!size)
204 return 0;
205 if (*result > size)
206 return -ERANGE;
207
208 strcpy(p, name);
209 return 0;
210}
211
212ssize_t
213xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
214{
215 struct xfs_attr_list_context context;
216 struct attrlist_cursor_kern cursor = { 0 };
2b0143b5 217 struct inode *inode = d_inode(dentry);
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218 int error;
219
220 /*
221 * First read the regular on-disk attributes.
222 */
223 memset(&context, 0, sizeof(context));
224 context.dp = XFS_I(inode);
225 context.cursor = &cursor;
226 context.resynch = 1;
227 context.alist = data;
228 context.bufsize = size;
229 context.firstu = context.bufsize;
230
231 if (size)
232 context.put_listent = xfs_xattr_put_listent;
233 else
234 context.put_listent = xfs_xattr_put_listent_sizes;
235
236 xfs_attr_list_int(&context);
237 if (context.count < 0)
238 return -ERANGE;
239
240 /*
241 * Then add the two synthetic ACL attributes.
242 */
ef14f0c1 243 if (posix_acl_access_exists(inode)) {
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244 error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
245 strlen(POSIX_ACL_XATTR_ACCESS) + 1,
246 data, size, &context.count);
247 if (error)
248 return error;
249 }
250
ef14f0c1 251 if (posix_acl_default_exists(inode)) {
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252 error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
253 strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
254 data, size, &context.count);
255 if (error)
256 return error;
257 }
258
259 return context.count;
260}
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