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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/sched.h>
8#include <linux/slab.h>
9#include <linux/spinlock.h>
10#include <linux/completion.h>
11#include <linux/buffer_head.h>
12#include <linux/xattr.h>
13#include <linux/posix_acl.h>
14#include <linux/posix_acl_xattr.h>
15#include <linux/gfs2_ondisk.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "acl.h"
20#include "xattr.h"
21#include "glock.h"
22#include "inode.h"
23#include "meta_io.h"
24#include "quota.h"
25#include "rgrp.h"
26#include "trans.h"
27#include "util.h"
28
29static const char *gfs2_acl_name(int type)
30{
31 switch (type) {
32 case ACL_TYPE_ACCESS:
33 return XATTR_POSIX_ACL_ACCESS;
34 case ACL_TYPE_DEFAULT:
35 return XATTR_POSIX_ACL_DEFAULT;
36 }
37 return NULL;
38}
39
40static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
41{
42 struct gfs2_inode *ip = GFS2_I(inode);
43 struct posix_acl *acl;
44 const char *name;
45 char *data;
46 int len;
47
48 if (!ip->i_eattr)
49 return NULL;
50
51 name = gfs2_acl_name(type);
52 len = gfs2_xattr_acl_get(ip, name, &data);
53 if (len <= 0)
54 return ERR_PTR(len);
55 acl = posix_acl_from_xattr(&init_user_ns, data, len);
56 kfree(data);
57 return acl;
58}
59
60struct posix_acl *gfs2_get_acl(struct inode *inode, int type, bool rcu)
61{
62 struct gfs2_inode *ip = GFS2_I(inode);
63 struct gfs2_holder gh;
64 bool need_unlock = false;
65 struct posix_acl *acl;
66
67 if (rcu)
68 return ERR_PTR(-ECHILD);
69
70 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
71 int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
72 LM_FLAG_ANY, &gh);
73 if (ret)
74 return ERR_PTR(ret);
75 need_unlock = true;
76 }
77 acl = __gfs2_get_acl(inode, type);
78 if (need_unlock)
79 gfs2_glock_dq_uninit(&gh);
80 return acl;
81}
82
83int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
84{
85 int error;
86 size_t len;
87 char *data;
88 const char *name = gfs2_acl_name(type);
89
90 if (acl) {
91 len = posix_acl_xattr_size(acl->a_count);
92 data = kmalloc(len, GFP_NOFS);
93 if (data == NULL)
94 return -ENOMEM;
95 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
96 if (error < 0)
97 goto out;
98 } else {
99 data = NULL;
100 len = 0;
101 }
102
103 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
104 if (error)
105 goto out;
106 set_cached_acl(inode, type, acl);
107out:
108 kfree(data);
109 return error;
110}
111
112int gfs2_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
113 struct posix_acl *acl, int type)
114{
115 struct inode *inode = d_inode(dentry);
116 struct gfs2_inode *ip = GFS2_I(inode);
117 struct gfs2_holder gh;
118 bool need_unlock = false;
119 int ret;
120 umode_t mode;
121
122 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
123 return -E2BIG;
124
125 ret = gfs2_qa_get(ip);
126 if (ret)
127 return ret;
128
129 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
130 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
131 if (ret)
132 goto out;
133 need_unlock = true;
134 }
135
136 mode = inode->i_mode;
137 if (type == ACL_TYPE_ACCESS && acl) {
138 ret = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl);
139 if (ret)
140 goto unlock;
141 }
142
143 ret = __gfs2_set_acl(inode, acl, type);
144 if (!ret && mode != inode->i_mode) {
145 inode->i_ctime = current_time(inode);
146 inode->i_mode = mode;
147 mark_inode_dirty(inode);
148 }
149unlock:
150 if (need_unlock)
151 gfs2_glock_dq_uninit(&gh);
152out:
153 gfs2_qa_put(ip);
154 return ret;
155}
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/xattr.h>
16#include <linux/posix_acl.h>
17#include <linux/posix_acl_xattr.h>
18#include <linux/gfs2_ondisk.h>
19
20#include "gfs2.h"
21#include "incore.h"
22#include "acl.h"
23#include "xattr.h"
24#include "glock.h"
25#include "inode.h"
26#include "meta_io.h"
27#include "trans.h"
28#include "util.h"
29
30static const char *gfs2_acl_name(int type)
31{
32 switch (type) {
33 case ACL_TYPE_ACCESS:
34 return GFS2_POSIX_ACL_ACCESS;
35 case ACL_TYPE_DEFAULT:
36 return GFS2_POSIX_ACL_DEFAULT;
37 }
38 return NULL;
39}
40
41struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
42{
43 struct gfs2_inode *ip = GFS2_I(inode);
44 struct posix_acl *acl;
45 const char *name;
46 char *data;
47 int len;
48
49 if (!ip->i_eattr)
50 return NULL;
51
52 acl = get_cached_acl(&ip->i_inode, type);
53 if (acl != ACL_NOT_CACHED)
54 return acl;
55
56 name = gfs2_acl_name(type);
57 if (name == NULL)
58 return ERR_PTR(-EINVAL);
59
60 len = gfs2_xattr_acl_get(ip, name, &data);
61 if (len < 0)
62 return ERR_PTR(len);
63 if (len == 0)
64 return NULL;
65
66 acl = posix_acl_from_xattr(data, len);
67 kfree(data);
68 return acl;
69}
70
71static int gfs2_set_mode(struct inode *inode, umode_t mode)
72{
73 int error = 0;
74
75 if (mode != inode->i_mode) {
76 inode->i_mode = mode;
77 mark_inode_dirty(inode);
78 }
79
80 return error;
81}
82
83static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
84{
85 int error;
86 int len;
87 char *data;
88 const char *name = gfs2_acl_name(type);
89
90 BUG_ON(name == NULL);
91 len = posix_acl_to_xattr(acl, NULL, 0);
92 if (len == 0)
93 return 0;
94 data = kmalloc(len, GFP_NOFS);
95 if (data == NULL)
96 return -ENOMEM;
97 error = posix_acl_to_xattr(acl, data, len);
98 if (error < 0)
99 goto out;
100 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
101 if (!error)
102 set_cached_acl(inode, type, acl);
103out:
104 kfree(data);
105 return error;
106}
107
108int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
109{
110 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
111 struct posix_acl *acl;
112 umode_t mode = inode->i_mode;
113 int error = 0;
114
115 if (!sdp->sd_args.ar_posix_acl)
116 return 0;
117 if (S_ISLNK(inode->i_mode))
118 return 0;
119
120 acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT);
121 if (IS_ERR(acl))
122 return PTR_ERR(acl);
123 if (!acl) {
124 mode &= ~current_umask();
125 return gfs2_set_mode(inode, mode);
126 }
127
128 if (S_ISDIR(inode->i_mode)) {
129 error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
130 if (error)
131 goto out;
132 }
133
134 error = posix_acl_create(&acl, GFP_NOFS, &mode);
135 if (error < 0)
136 return error;
137
138 if (error == 0)
139 goto munge;
140
141 error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
142 if (error)
143 goto out;
144munge:
145 error = gfs2_set_mode(inode, mode);
146out:
147 posix_acl_release(acl);
148 return error;
149}
150
151int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
152{
153 struct inode *inode = &ip->i_inode;
154 struct posix_acl *acl;
155 char *data;
156 unsigned int len;
157 int error;
158
159 acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS);
160 if (IS_ERR(acl))
161 return PTR_ERR(acl);
162 if (!acl)
163 return gfs2_setattr_simple(inode, attr);
164
165 error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
166 if (error)
167 return error;
168
169 len = posix_acl_to_xattr(acl, NULL, 0);
170 data = kmalloc(len, GFP_NOFS);
171 error = -ENOMEM;
172 if (data == NULL)
173 goto out;
174 posix_acl_to_xattr(acl, data, len);
175 error = gfs2_xattr_acl_chmod(ip, attr, data);
176 kfree(data);
177 set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
178
179out:
180 posix_acl_release(acl);
181 return error;
182}
183
184static int gfs2_acl_type(const char *name)
185{
186 if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
187 return ACL_TYPE_ACCESS;
188 if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
189 return ACL_TYPE_DEFAULT;
190 return -EINVAL;
191}
192
193static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
194 void *buffer, size_t size, int xtype)
195{
196 struct inode *inode = dentry->d_inode;
197 struct gfs2_sbd *sdp = GFS2_SB(inode);
198 struct posix_acl *acl;
199 int type;
200 int error;
201
202 if (!sdp->sd_args.ar_posix_acl)
203 return -EOPNOTSUPP;
204
205 type = gfs2_acl_type(name);
206 if (type < 0)
207 return type;
208
209 acl = gfs2_get_acl(inode, type);
210 if (IS_ERR(acl))
211 return PTR_ERR(acl);
212 if (acl == NULL)
213 return -ENODATA;
214
215 error = posix_acl_to_xattr(acl, buffer, size);
216 posix_acl_release(acl);
217
218 return error;
219}
220
221static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
222 const void *value, size_t size, int flags,
223 int xtype)
224{
225 struct inode *inode = dentry->d_inode;
226 struct gfs2_sbd *sdp = GFS2_SB(inode);
227 struct posix_acl *acl = NULL;
228 int error = 0, type;
229
230 if (!sdp->sd_args.ar_posix_acl)
231 return -EOPNOTSUPP;
232
233 type = gfs2_acl_type(name);
234 if (type < 0)
235 return type;
236 if (flags & XATTR_CREATE)
237 return -EINVAL;
238 if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
239 return value ? -EACCES : 0;
240 if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
241 return -EPERM;
242 if (S_ISLNK(inode->i_mode))
243 return -EOPNOTSUPP;
244
245 if (!value)
246 goto set_acl;
247
248 acl = posix_acl_from_xattr(value, size);
249 if (!acl) {
250 /*
251 * acl_set_file(3) may request that we set default ACLs with
252 * zero length -- defend (gracefully) against that here.
253 */
254 goto out;
255 }
256 if (IS_ERR(acl)) {
257 error = PTR_ERR(acl);
258 goto out;
259 }
260
261 error = posix_acl_valid(acl);
262 if (error)
263 goto out_release;
264
265 error = -EINVAL;
266 if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
267 goto out_release;
268
269 if (type == ACL_TYPE_ACCESS) {
270 umode_t mode = inode->i_mode;
271 error = posix_acl_equiv_mode(acl, &mode);
272
273 if (error <= 0) {
274 posix_acl_release(acl);
275 acl = NULL;
276
277 if (error < 0)
278 return error;
279 }
280
281 error = gfs2_set_mode(inode, mode);
282 if (error)
283 goto out_release;
284 }
285
286set_acl:
287 error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
288 if (!error) {
289 if (acl)
290 set_cached_acl(inode, type, acl);
291 else
292 forget_cached_acl(inode, type);
293 }
294out_release:
295 posix_acl_release(acl);
296out:
297 return error;
298}
299
300const struct xattr_handler gfs2_xattr_system_handler = {
301 .prefix = XATTR_SYSTEM_PREFIX,
302 .flags = GFS2_EATYPE_SYS,
303 .get = gfs2_xattr_system_get,
304 .set = gfs2_xattr_system_set,
305};
306