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KaiGai Kohei652ecc22006-05-13 15:18:27 +09001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +09003 *
David Woodhousec00c3102007-04-25 14:16:47 +01004 * Copyright © 2006 NEC Corporation
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +09005 *
KaiGai Kohei652ecc22006-05-13 15:18:27 +09006 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
David Woodhousec00c3102007-04-25 14:16:47 +010011
Joe Perches5a528952012-02-15 15:56:45 -080012#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090014#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/fs.h>
Al Viro914e2632006-10-18 13:55:46 -040017#include <linux/sched.h>
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090018#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) {
KaiGai Koheide1f72f2006-05-13 15:13:27 +090029 return sizeof(struct jffs2_acl_header)
30 + count * sizeof(struct jffs2_acl_entry_short);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090031 } else {
KaiGai Koheide1f72f2006-05-13 15:13:27 +090032 return sizeof(struct jffs2_acl_header)
33 + 4 * sizeof(struct jffs2_acl_entry_short)
34 + (count - 4) * sizeof(struct jffs2_acl_entry);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090035 }
36}
37
38static int jffs2_acl_count(size_t size)
39{
40 size_t s;
41
KaiGai Koheide1f72f2006-05-13 15:13:27 +090042 size -= sizeof(struct jffs2_acl_header);
Roel Kluinfc371a22009-03-04 12:01:41 -080043 if (size < 4 * sizeof(struct jffs2_acl_entry_short)) {
KaiGai Koheide1f72f2006-05-13 15:13:27 +090044 if (size % sizeof(struct jffs2_acl_entry_short))
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090045 return -1;
KaiGai Koheide1f72f2006-05-13 15:13:27 +090046 return size / sizeof(struct jffs2_acl_entry_short);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090047 } else {
Roel Kluinfc371a22009-03-04 12:01:41 -080048 s = size - 4 * sizeof(struct jffs2_acl_entry_short);
KaiGai Koheide1f72f2006-05-13 15:13:27 +090049 if (s % sizeof(struct jffs2_acl_entry))
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090050 return -1;
KaiGai Koheide1f72f2006-05-13 15:13:27 +090051 return s / sizeof(struct jffs2_acl_entry) + 4;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090052 }
53}
54
KaiGai Koheidea80132006-05-13 15:20:24 +090055static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090056{
KaiGai Koheidea80132006-05-13 15:20:24 +090057 void *end = value + size;
58 struct jffs2_acl_header *header = value;
59 struct jffs2_acl_entry *entry;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090060 struct posix_acl *acl;
61 uint32_t ver;
62 int i, count;
63
64 if (!value)
65 return NULL;
KaiGai Koheide1f72f2006-05-13 15:13:27 +090066 if (size < sizeof(struct jffs2_acl_header))
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090067 return ERR_PTR(-EINVAL);
KaiGai Koheidea80132006-05-13 15:20:24 +090068 ver = je32_to_cpu(header->a_version);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090069 if (ver != JFFS2_ACL_VERSION) {
70 JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
71 return ERR_PTR(-EINVAL);
72 }
73
KaiGai Koheidea80132006-05-13 15:20:24 +090074 value += sizeof(struct jffs2_acl_header);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090075 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++) {
KaiGai Koheidea80132006-05-13 15:20:24 +090086 entry = value;
87 if (value + sizeof(struct jffs2_acl_entry_short) > end)
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090088 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:
KaiGai Koheidea80132006-05-13 15:20:24 +090096 value += sizeof(struct jffs2_acl_entry_short);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090097 break;
98
99 case ACL_USER:
Eric W. Biederman0cfe53d2012-02-07 16:28:39 -0800100 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;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900107 case ACL_GROUP:
KaiGai Koheidea80132006-05-13 15:20:24 +0900108 value += sizeof(struct jffs2_acl_entry);
109 if (value > end)
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900110 goto fail;
Eric W. Biederman0cfe53d2012-02-07 16:28:39 -0800111 acl->a_entries[i].e_gid =
112 make_kgid(&init_user_ns,
113 je32_to_cpu(entry->e_id));
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900114 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{
KaiGai Koheidea80132006-05-13 15:20:24 +0900130 struct jffs2_acl_header *header;
131 struct jffs2_acl_entry *entry;
132 void *e;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900133 size_t i;
134
135 *size = jffs2_acl_size(acl->a_count);
KaiGai Koheidea80132006-05-13 15:20:24 +0900136 header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL);
137 if (!header)
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900138 return ERR_PTR(-ENOMEM);
KaiGai Koheidea80132006-05-13 15:20:24 +0900139 header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
140 e = header + 1;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900141 for (i=0; i < acl->a_count; i++) {
Eric W. Biederman0cfe53d2012-02-07 16:28:39 -0800142 const struct posix_acl_entry *acl_e = &acl->a_entries[i];
KaiGai Koheidea80132006-05-13 15:20:24 +0900143 entry = e;
Eric W. Biederman0cfe53d2012-02-07 16:28:39 -0800144 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) {
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900147 case ACL_USER:
Eric W. Biederman0cfe53d2012-02-07 16:28:39 -0800148 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;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900152 case ACL_GROUP:
Eric W. Biederman0cfe53d2012-02-07 16:28:39 -0800153 entry->e_id = cpu_to_je32(
154 from_kgid(&init_user_ns, acl_e->e_gid));
KaiGai Koheide1f72f2006-05-13 15:13:27 +0900155 e += sizeof(struct jffs2_acl_entry);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900156 break;
157
158 case ACL_USER_OBJ:
159 case ACL_GROUP_OBJ:
160 case ACL_MASK:
161 case ACL_OTHER:
KaiGai Koheide1f72f2006-05-13 15:13:27 +0900162 e += sizeof(struct jffs2_acl_entry_short);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900163 break;
164
165 default:
166 goto fail;
167 }
168 }
KaiGai Koheidea80132006-05-13 15:20:24 +0900169 return header;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900170 fail:
KaiGai Koheidea80132006-05-13 15:20:24 +0900171 kfree(header);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900172 return ERR_PTR(-EINVAL);
173}
174
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200175struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900176{
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900177 struct posix_acl *acl;
178 char *value = NULL;
179 int rc, xprefix;
180
181 switch (type) {
182 case ACL_TYPE_ACCESS:
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900183 xprefix = JFFS2_XPREFIX_ACL_ACCESS;
184 break;
185 case ACL_TYPE_DEFAULT:
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900186 xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
187 break;
188 default:
Al Viro073aaa12009-06-09 12:11:54 -0400189 BUG();
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900190 }
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 }
Fabian Frederickb6861d02014-06-16 19:58:07 +0200205 kfree(value);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900206 return acl;
207}
208
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900209static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
210{
211 char *value = NULL;
212 size_t size = 0;
213 int rc;
214
215 if (acl) {
216 value = jffs2_acl_to_medium(acl, &size);
217 if (IS_ERR(value))
218 return PTR_ERR(value);
219 }
220 rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
221 if (!value && rc == -ENODATA)
222 rc = 0;
223 kfree(value);
224
225 return rc;
226}
227
Christoph Hellwigf2963d42013-12-20 05:16:47 -0800228int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900229{
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900230 int rc, xprefix;
231
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900232 switch (type) {
233 case ACL_TYPE_ACCESS:
234 xprefix = JFFS2_XPREFIX_ACL_ACCESS;
235 if (acl) {
Al Virod6952122011-07-23 18:56:36 -0400236 umode_t mode = inode->i_mode;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900237 rc = posix_acl_equiv_mode(acl, &mode);
238 if (rc < 0)
239 return rc;
240 if (inode->i_mode != mode) {
David Woodhouse9ed437c2007-08-22 12:39:19 +0100241 struct iattr attr;
242
Jan Kara1c24d062010-06-04 17:07:55 +0200243 attr.ia_valid = ATTR_MODE | ATTR_CTIME;
David Woodhouse9ed437c2007-08-22 12:39:19 +0100244 attr.ia_mode = mode;
Jan Kara1c24d062010-06-04 17:07:55 +0200245 attr.ia_ctime = CURRENT_TIME_SEC;
David Woodhouse9ed437c2007-08-22 12:39:19 +0100246 rc = jffs2_do_setattr(inode, &attr);
247 if (rc < 0)
248 return rc;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900249 }
250 if (rc == 0)
251 acl = NULL;
252 }
253 break;
254 case ACL_TYPE_DEFAULT:
255 xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
256 if (!S_ISDIR(inode->i_mode))
257 return acl ? -EACCES : 0;
258 break;
259 default:
260 return -EINVAL;
261 }
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900262 rc = __jffs2_set_acl(inode, xprefix, acl);
Al Viro073aaa12009-06-09 12:11:54 -0400263 if (!rc)
264 set_cached_acl(inode, type, acl);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900265 return rc;
266}
267
Al Virod3fb6122011-07-23 18:37:50 -0400268int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode)
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900269{
Christoph Hellwigf2963d42013-12-20 05:16:47 -0800270 struct posix_acl *default_acl, *acl;
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900271 int rc;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900272
Al Viro72c04902009-06-24 16:58:48 -0400273 cache_no_acl(inode);
David Woodhouse9ed437c2007-08-22 12:39:19 +0100274
Christoph Hellwigf2963d42013-12-20 05:16:47 -0800275 rc = posix_acl_create(dir_i, i_mode, &default_acl, &acl);
276 if (rc)
277 return rc;
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900278
Christoph Hellwigf2963d42013-12-20 05:16:47 -0800279 if (default_acl) {
280 set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl);
281 posix_acl_release(default_acl);
282 }
283 if (acl) {
284 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
Al Viro826cae22011-07-23 03:10:32 -0400285 posix_acl_release(acl);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900286 }
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900287 return 0;
288}
289
290int jffs2_init_acl_post(struct inode *inode)
291{
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900292 int rc;
293
Al Viro290c2632009-06-08 19:55:12 -0400294 if (inode->i_default_acl) {
295 rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl);
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900296 if (rc)
297 return rc;
298 }
299
Al Viro290c2632009-06-08 19:55:12 -0400300 if (inode->i_acl) {
301 rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl);
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900302 if (rc)
303 return rc;
304 }
305
David Woodhouse8d6ea582007-10-27 10:36:44 -0400306 return 0;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900307}