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1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2006 NEC Corporation
5 *
6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/fs.h>
17#include <linux/sched.h>
18#include <linux/time.h>
19#include <linux/crc32.h>
20#include <linux/jffs2.h>
21#include <linux/xattr.h>
22#include <linux/posix_acl_xattr.h>
23#include <linux/mtd/mtd.h>
24#include "nodelist.h"
25
26static size_t jffs2_acl_size(int count)
27{
28 if (count <= 4) {
29 return sizeof(struct jffs2_acl_header)
30 + count * sizeof(struct jffs2_acl_entry_short);
31 } else {
32 return sizeof(struct jffs2_acl_header)
33 + 4 * sizeof(struct jffs2_acl_entry_short)
34 + (count - 4) * sizeof(struct jffs2_acl_entry);
35 }
36}
37
38static int jffs2_acl_count(size_t size)
39{
40 size_t s;
41
42 size -= sizeof(struct jffs2_acl_header);
43 if (size < 4 * sizeof(struct jffs2_acl_entry_short)) {
44 if (size % sizeof(struct jffs2_acl_entry_short))
45 return -1;
46 return size / sizeof(struct jffs2_acl_entry_short);
47 } else {
48 s = size - 4 * sizeof(struct jffs2_acl_entry_short);
49 if (s % sizeof(struct jffs2_acl_entry))
50 return -1;
51 return s / sizeof(struct jffs2_acl_entry) + 4;
52 }
53}
54
55static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
56{
57 void *end = value + size;
58 struct jffs2_acl_header *header = value;
59 struct jffs2_acl_entry *entry;
60 struct posix_acl *acl;
61 uint32_t ver;
62 int i, count;
63
64 if (!value)
65 return NULL;
66 if (size < sizeof(struct jffs2_acl_header))
67 return ERR_PTR(-EINVAL);
68 ver = je32_to_cpu(header->a_version);
69 if (ver != JFFS2_ACL_VERSION) {
70 JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
71 return ERR_PTR(-EINVAL);
72 }
73
74 value += sizeof(struct jffs2_acl_header);
75 count = jffs2_acl_count(size);
76 if (count < 0)
77 return ERR_PTR(-EINVAL);
78 if (count == 0)
79 return NULL;
80
81 acl = posix_acl_alloc(count, GFP_KERNEL);
82 if (!acl)
83 return ERR_PTR(-ENOMEM);
84
85 for (i=0; i < count; i++) {
86 entry = value;
87 if (value + sizeof(struct jffs2_acl_entry_short) > end)
88 goto fail;
89 acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
90 acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm);
91 switch (acl->a_entries[i].e_tag) {
92 case ACL_USER_OBJ:
93 case ACL_GROUP_OBJ:
94 case ACL_MASK:
95 case ACL_OTHER:
96 value += sizeof(struct jffs2_acl_entry_short);
97 break;
98
99 case ACL_USER:
100 value += sizeof(struct jffs2_acl_entry);
101 if (value > end)
102 goto fail;
103 acl->a_entries[i].e_uid =
104 make_kuid(&init_user_ns,
105 je32_to_cpu(entry->e_id));
106 break;
107 case ACL_GROUP:
108 value += sizeof(struct jffs2_acl_entry);
109 if (value > end)
110 goto fail;
111 acl->a_entries[i].e_gid =
112 make_kgid(&init_user_ns,
113 je32_to_cpu(entry->e_id));
114 break;
115
116 default:
117 goto fail;
118 }
119 }
120 if (value != end)
121 goto fail;
122 return acl;
123 fail:
124 posix_acl_release(acl);
125 return ERR_PTR(-EINVAL);
126}
127
128static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
129{
130 struct jffs2_acl_header *header;
131 struct jffs2_acl_entry *entry;
132 void *e;
133 size_t i;
134
135 *size = jffs2_acl_size(acl->a_count);
136 header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL);
137 if (!header)
138 return ERR_PTR(-ENOMEM);
139 header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
140 e = header + 1;
141 for (i=0; i < acl->a_count; i++) {
142 const struct posix_acl_entry *acl_e = &acl->a_entries[i];
143 entry = e;
144 entry->e_tag = cpu_to_je16(acl_e->e_tag);
145 entry->e_perm = cpu_to_je16(acl_e->e_perm);
146 switch(acl_e->e_tag) {
147 case ACL_USER:
148 entry->e_id = cpu_to_je32(
149 from_kuid(&init_user_ns, acl_e->e_uid));
150 e += sizeof(struct jffs2_acl_entry);
151 break;
152 case ACL_GROUP:
153 entry->e_id = cpu_to_je32(
154 from_kgid(&init_user_ns, acl_e->e_gid));
155 e += sizeof(struct jffs2_acl_entry);
156 break;
157
158 case ACL_USER_OBJ:
159 case ACL_GROUP_OBJ:
160 case ACL_MASK:
161 case ACL_OTHER:
162 e += sizeof(struct jffs2_acl_entry_short);
163 break;
164
165 default:
166 goto fail;
167 }
168 }
169 return header;
170 fail:
171 kfree(header);
172 return ERR_PTR(-EINVAL);
173}
174
175struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
176{
177 struct posix_acl *acl;
178 char *value = NULL;
179 int rc, xprefix;
180
181 switch (type) {
182 case ACL_TYPE_ACCESS:
183 xprefix = JFFS2_XPREFIX_ACL_ACCESS;
184 break;
185 case ACL_TYPE_DEFAULT:
186 xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
187 break;
188 default:
189 BUG();
190 }
191 rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
192 if (rc > 0) {
193 value = kmalloc(rc, GFP_KERNEL);
194 if (!value)
195 return ERR_PTR(-ENOMEM);
196 rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
197 }
198 if (rc > 0) {
199 acl = jffs2_acl_from_medium(value, rc);
200 } else if (rc == -ENODATA || rc == -ENOSYS) {
201 acl = NULL;
202 } else {
203 acl = ERR_PTR(rc);
204 }
205 kfree(value);
206 if (!IS_ERR(acl))
207 set_cached_acl(inode, type, acl);
208 return acl;
209}
210
211static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
212{
213 char *value = NULL;
214 size_t size = 0;
215 int rc;
216
217 if (acl) {
218 value = jffs2_acl_to_medium(acl, &size);
219 if (IS_ERR(value))
220 return PTR_ERR(value);
221 }
222 rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
223 if (!value && rc == -ENODATA)
224 rc = 0;
225 kfree(value);
226
227 return rc;
228}
229
230int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
231{
232 int rc, xprefix;
233
234 switch (type) {
235 case ACL_TYPE_ACCESS:
236 xprefix = JFFS2_XPREFIX_ACL_ACCESS;
237 if (acl) {
238 umode_t mode = inode->i_mode;
239 rc = posix_acl_equiv_mode(acl, &mode);
240 if (rc < 0)
241 return rc;
242 if (inode->i_mode != mode) {
243 struct iattr attr;
244
245 attr.ia_valid = ATTR_MODE | ATTR_CTIME;
246 attr.ia_mode = mode;
247 attr.ia_ctime = CURRENT_TIME_SEC;
248 rc = jffs2_do_setattr(inode, &attr);
249 if (rc < 0)
250 return rc;
251 }
252 if (rc == 0)
253 acl = NULL;
254 }
255 break;
256 case ACL_TYPE_DEFAULT:
257 xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
258 if (!S_ISDIR(inode->i_mode))
259 return acl ? -EACCES : 0;
260 break;
261 default:
262 return -EINVAL;
263 }
264 rc = __jffs2_set_acl(inode, xprefix, acl);
265 if (!rc)
266 set_cached_acl(inode, type, acl);
267 return rc;
268}
269
270int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode)
271{
272 struct posix_acl *default_acl, *acl;
273 int rc;
274
275 cache_no_acl(inode);
276
277 rc = posix_acl_create(dir_i, i_mode, &default_acl, &acl);
278 if (rc)
279 return rc;
280
281 if (default_acl) {
282 set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl);
283 posix_acl_release(default_acl);
284 }
285 if (acl) {
286 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
287 posix_acl_release(acl);
288 }
289 return 0;
290}
291
292int jffs2_init_acl_post(struct inode *inode)
293{
294 int rc;
295
296 if (inode->i_default_acl) {
297 rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl);
298 if (rc)
299 return rc;
300 }
301
302 if (inode->i_acl) {
303 rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl);
304 if (rc)
305 return rc;
306 }
307
308 return 0;
309}
1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2006 NEC Corporation
5 *
6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/fs.h>
17#include <linux/sched.h>
18#include <linux/time.h>
19#include <linux/crc32.h>
20#include <linux/jffs2.h>
21#include <linux/xattr.h>
22#include <linux/posix_acl_xattr.h>
23#include <linux/mtd/mtd.h>
24#include "nodelist.h"
25
26static size_t jffs2_acl_size(int count)
27{
28 if (count <= 4) {
29 return sizeof(struct jffs2_acl_header)
30 + count * sizeof(struct jffs2_acl_entry_short);
31 } else {
32 return sizeof(struct jffs2_acl_header)
33 + 4 * sizeof(struct jffs2_acl_entry_short)
34 + (count - 4) * sizeof(struct jffs2_acl_entry);
35 }
36}
37
38static int jffs2_acl_count(size_t size)
39{
40 size_t s;
41
42 size -= sizeof(struct jffs2_acl_header);
43 if (size < 4 * sizeof(struct jffs2_acl_entry_short)) {
44 if (size % sizeof(struct jffs2_acl_entry_short))
45 return -1;
46 return size / sizeof(struct jffs2_acl_entry_short);
47 } else {
48 s = size - 4 * sizeof(struct jffs2_acl_entry_short);
49 if (s % sizeof(struct jffs2_acl_entry))
50 return -1;
51 return s / sizeof(struct jffs2_acl_entry) + 4;
52 }
53}
54
55static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
56{
57 void *end = value + size;
58 struct jffs2_acl_header *header = value;
59 struct jffs2_acl_entry *entry;
60 struct posix_acl *acl;
61 uint32_t ver;
62 int i, count;
63
64 if (!value)
65 return NULL;
66 if (size < sizeof(struct jffs2_acl_header))
67 return ERR_PTR(-EINVAL);
68 ver = je32_to_cpu(header->a_version);
69 if (ver != JFFS2_ACL_VERSION) {
70 JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
71 return ERR_PTR(-EINVAL);
72 }
73
74 value += sizeof(struct jffs2_acl_header);
75 count = jffs2_acl_count(size);
76 if (count < 0)
77 return ERR_PTR(-EINVAL);
78 if (count == 0)
79 return NULL;
80
81 acl = posix_acl_alloc(count, GFP_KERNEL);
82 if (!acl)
83 return ERR_PTR(-ENOMEM);
84
85 for (i=0; i < count; i++) {
86 entry = value;
87 if (value + sizeof(struct jffs2_acl_entry_short) > end)
88 goto fail;
89 acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
90 acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm);
91 switch (acl->a_entries[i].e_tag) {
92 case ACL_USER_OBJ:
93 case ACL_GROUP_OBJ:
94 case ACL_MASK:
95 case ACL_OTHER:
96 value += sizeof(struct jffs2_acl_entry_short);
97 break;
98
99 case ACL_USER:
100 value += sizeof(struct jffs2_acl_entry);
101 if (value > end)
102 goto fail;
103 acl->a_entries[i].e_uid =
104 make_kuid(&init_user_ns,
105 je32_to_cpu(entry->e_id));
106 break;
107 case ACL_GROUP:
108 value += sizeof(struct jffs2_acl_entry);
109 if (value > end)
110 goto fail;
111 acl->a_entries[i].e_gid =
112 make_kgid(&init_user_ns,
113 je32_to_cpu(entry->e_id));
114 break;
115
116 default:
117 goto fail;
118 }
119 }
120 if (value != end)
121 goto fail;
122 return acl;
123 fail:
124 posix_acl_release(acl);
125 return ERR_PTR(-EINVAL);
126}
127
128static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
129{
130 struct jffs2_acl_header *header;
131 struct jffs2_acl_entry *entry;
132 void *e;
133 size_t i;
134
135 *size = jffs2_acl_size(acl->a_count);
136 header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL);
137 if (!header)
138 return ERR_PTR(-ENOMEM);
139 header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
140 e = header + 1;
141 for (i=0; i < acl->a_count; i++) {
142 const struct posix_acl_entry *acl_e = &acl->a_entries[i];
143 entry = e;
144 entry->e_tag = cpu_to_je16(acl_e->e_tag);
145 entry->e_perm = cpu_to_je16(acl_e->e_perm);
146 switch(acl_e->e_tag) {
147 case ACL_USER:
148 entry->e_id = cpu_to_je32(
149 from_kuid(&init_user_ns, acl_e->e_uid));
150 e += sizeof(struct jffs2_acl_entry);
151 break;
152 case ACL_GROUP:
153 entry->e_id = cpu_to_je32(
154 from_kgid(&init_user_ns, acl_e->e_gid));
155 e += sizeof(struct jffs2_acl_entry);
156 break;
157
158 case ACL_USER_OBJ:
159 case ACL_GROUP_OBJ:
160 case ACL_MASK:
161 case ACL_OTHER:
162 e += sizeof(struct jffs2_acl_entry_short);
163 break;
164
165 default:
166 goto fail;
167 }
168 }
169 return header;
170 fail:
171 kfree(header);
172 return ERR_PTR(-EINVAL);
173}
174
175struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
176{
177 struct posix_acl *acl;
178 char *value = NULL;
179 int rc, xprefix;
180
181 switch (type) {
182 case ACL_TYPE_ACCESS:
183 xprefix = JFFS2_XPREFIX_ACL_ACCESS;
184 break;
185 case ACL_TYPE_DEFAULT:
186 xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
187 break;
188 default:
189 BUG();
190 }
191 rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
192 if (rc > 0) {
193 value = kmalloc(rc, GFP_KERNEL);
194 if (!value)
195 return ERR_PTR(-ENOMEM);
196 rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
197 }
198 if (rc > 0) {
199 acl = jffs2_acl_from_medium(value, rc);
200 } else if (rc == -ENODATA || rc == -ENOSYS) {
201 acl = NULL;
202 } else {
203 acl = ERR_PTR(rc);
204 }
205 if (value)
206 kfree(value);
207 if (!IS_ERR(acl))
208 set_cached_acl(inode, type, acl);
209 return acl;
210}
211
212static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
213{
214 char *value = NULL;
215 size_t size = 0;
216 int rc;
217
218 if (acl) {
219 value = jffs2_acl_to_medium(acl, &size);
220 if (IS_ERR(value))
221 return PTR_ERR(value);
222 }
223 rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
224 if (!value && rc == -ENODATA)
225 rc = 0;
226 kfree(value);
227
228 return rc;
229}
230
231int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
232{
233 int rc, xprefix;
234
235 switch (type) {
236 case ACL_TYPE_ACCESS:
237 xprefix = JFFS2_XPREFIX_ACL_ACCESS;
238 if (acl) {
239 umode_t mode = inode->i_mode;
240 rc = posix_acl_equiv_mode(acl, &mode);
241 if (rc < 0)
242 return rc;
243 if (inode->i_mode != mode) {
244 struct iattr attr;
245
246 attr.ia_valid = ATTR_MODE | ATTR_CTIME;
247 attr.ia_mode = mode;
248 attr.ia_ctime = CURRENT_TIME_SEC;
249 rc = jffs2_do_setattr(inode, &attr);
250 if (rc < 0)
251 return rc;
252 }
253 if (rc == 0)
254 acl = NULL;
255 }
256 break;
257 case ACL_TYPE_DEFAULT:
258 xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
259 if (!S_ISDIR(inode->i_mode))
260 return acl ? -EACCES : 0;
261 break;
262 default:
263 return -EINVAL;
264 }
265 rc = __jffs2_set_acl(inode, xprefix, acl);
266 if (!rc)
267 set_cached_acl(inode, type, acl);
268 return rc;
269}
270
271int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode)
272{
273 struct posix_acl *default_acl, *acl;
274 int rc;
275
276 cache_no_acl(inode);
277
278 rc = posix_acl_create(dir_i, i_mode, &default_acl, &acl);
279 if (rc)
280 return rc;
281
282 if (default_acl) {
283 set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl);
284 posix_acl_release(default_acl);
285 }
286 if (acl) {
287 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
288 posix_acl_release(acl);
289 }
290 return 0;
291}
292
293int jffs2_init_acl_post(struct inode *inode)
294{
295 int rc;
296
297 if (inode->i_default_acl) {
298 rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl);
299 if (rc)
300 return rc;
301 }
302
303 if (inode->i_acl) {
304 rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl);
305 if (rc)
306 return rc;
307 }
308
309 return 0;
310}