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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b7fa0554 | 2 | #include <linux/fs.h> |
5a0e3ad6 | 3 | #include <linux/gfp.h> |
b7fa0554 AG |
4 | #include <linux/nfs.h> |
5 | #include <linux/nfs3.h> | |
6 | #include <linux/nfs_fs.h> | |
334a13ec | 7 | #include <linux/posix_acl_xattr.h> |
b7fa0554 AG |
8 | #include <linux/nfsacl.h> |
9 | ||
f41f7418 | 10 | #include "internal.h" |
3fc3edf1 | 11 | #include "nfs3_fs.h" |
f41f7418 | 12 | |
b7fa0554 AG |
13 | #define NFSDBG_FACILITY NFSDBG_PROC |
14 | ||
b8a7a3a6 AG |
15 | /* |
16 | * nfs3_prepare_get_acl, nfs3_complete_get_acl, nfs3_abort_get_acl: Helpers for | |
17 | * caching get_acl results in a race-free way. See fs/posix_acl.c:get_acl() | |
18 | * for explanations. | |
19 | */ | |
20 | static void nfs3_prepare_get_acl(struct posix_acl **p) | |
21 | { | |
22 | struct posix_acl *sentinel = uncached_acl_sentinel(current); | |
23 | ||
24 | if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) { | |
25 | /* Not the first reader or sentinel already in place. */ | |
26 | } | |
27 | } | |
28 | ||
29 | static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl) | |
30 | { | |
31 | struct posix_acl *sentinel = uncached_acl_sentinel(current); | |
32 | ||
33 | /* Only cache the ACL if our sentinel is still in place. */ | |
34 | posix_acl_dup(acl); | |
35 | if (cmpxchg(p, sentinel, acl) != sentinel) | |
36 | posix_acl_release(acl); | |
37 | } | |
38 | ||
39 | static void nfs3_abort_get_acl(struct posix_acl **p) | |
40 | { | |
41 | struct posix_acl *sentinel = uncached_acl_sentinel(current); | |
42 | ||
43 | /* Remove our sentinel upon failure. */ | |
44 | cmpxchg(p, sentinel, ACL_NOT_CACHED); | |
45 | } | |
46 | ||
013cdf10 | 47 | struct posix_acl *nfs3_get_acl(struct inode *inode, int type) |
b7fa0554 AG |
48 | { |
49 | struct nfs_server *server = NFS_SERVER(inode); | |
b7fa0554 AG |
50 | struct page *pages[NFSACL_MAXPAGES] = { }; |
51 | struct nfs3_getaclargs args = { | |
52 | .fh = NFS_FH(inode), | |
53 | /* The xdr layer may allocate pages here. */ | |
54 | .pages = pages, | |
55 | }; | |
56 | struct nfs3_getaclres res = { | |
17280175 | 57 | NULL, |
b7fa0554 | 58 | }; |
dead28da CL |
59 | struct rpc_message msg = { |
60 | .rpc_argp = &args, | |
61 | .rpc_resp = &res, | |
62 | }; | |
b7fa0554 AG |
63 | int status, count; |
64 | ||
65 | if (!nfs_server_capable(inode, NFS_CAP_ACLS)) | |
66 | return ERR_PTR(-EOPNOTSUPP); | |
67 | ||
1f3208b2 | 68 | status = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); |
5c6a9f7d AG |
69 | if (status < 0) |
70 | return ERR_PTR(status); | |
b7fa0554 | 71 | |
5c6a9f7d AG |
72 | /* |
73 | * Only get the access acl when explicitly requested: We don't | |
74 | * need it for access decisions, and only some applications use | |
75 | * it. Applications which request the access acl first are not | |
76 | * penalized from this optimization. | |
77 | */ | |
78 | if (type == ACL_TYPE_ACCESS) | |
79 | args.mask |= NFS_ACLCNT|NFS_ACL; | |
80 | if (S_ISDIR(inode->i_mode)) | |
81 | args.mask |= NFS_DFACLCNT|NFS_DFACL; | |
82 | if (args.mask == 0) | |
83 | return NULL; | |
b7fa0554 AG |
84 | |
85 | dprintk("NFS call getacl\n"); | |
dead28da | 86 | msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; |
6e94d629 TM |
87 | res.fattr = nfs_alloc_fattr(); |
88 | if (res.fattr == NULL) | |
89 | return ERR_PTR(-ENOMEM); | |
90 | ||
b8a7a3a6 AG |
91 | if (args.mask & NFS_ACL) |
92 | nfs3_prepare_get_acl(&inode->i_acl); | |
93 | if (args.mask & NFS_DFACL) | |
94 | nfs3_prepare_get_acl(&inode->i_default_acl); | |
95 | ||
dead28da | 96 | status = rpc_call_sync(server->client_acl, &msg, 0); |
b7fa0554 AG |
97 | dprintk("NFS reply getacl: %d\n", status); |
98 | ||
99 | /* pages may have been allocated at the xdr layer. */ | |
100 | for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) | |
101 | __free_page(args.pages[count]); | |
102 | ||
103 | switch (status) { | |
104 | case 0: | |
6e94d629 | 105 | status = nfs_refresh_inode(inode, res.fattr); |
b7fa0554 AG |
106 | break; |
107 | case -EPFNOSUPPORT: | |
108 | case -EPROTONOSUPPORT: | |
109 | dprintk("NFS_V3_ACL extension not supported; disabling\n"); | |
110 | server->caps &= ~NFS_CAP_ACLS; | |
df561f66 | 111 | fallthrough; |
b7fa0554 AG |
112 | case -ENOTSUPP: |
113 | status = -EOPNOTSUPP; | |
ffb81717 | 114 | goto getout; |
b7fa0554 AG |
115 | default: |
116 | goto getout; | |
117 | } | |
118 | if ((args.mask & res.mask) != args.mask) { | |
119 | status = -EIO; | |
120 | goto getout; | |
121 | } | |
122 | ||
123 | if (res.acl_access != NULL) { | |
718360c5 | 124 | if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) || |
013cdf10 | 125 | res.acl_access->a_count == 0) { |
b7fa0554 AG |
126 | posix_acl_release(res.acl_access); |
127 | res.acl_access = NULL; | |
128 | } | |
129 | } | |
130 | ||
013cdf10 | 131 | if (res.mask & NFS_ACL) |
b8a7a3a6 | 132 | nfs3_complete_get_acl(&inode->i_acl, res.acl_access); |
013cdf10 CH |
133 | else |
134 | forget_cached_acl(inode, ACL_TYPE_ACCESS); | |
b7fa0554 | 135 | |
013cdf10 | 136 | if (res.mask & NFS_DFACL) |
b8a7a3a6 | 137 | nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default); |
013cdf10 CH |
138 | else |
139 | forget_cached_acl(inode, ACL_TYPE_DEFAULT); | |
140 | ||
141 | nfs_free_fattr(res.fattr); | |
142 | if (type == ACL_TYPE_ACCESS) { | |
143 | posix_acl_release(res.acl_default); | |
144 | return res.acl_access; | |
145 | } else { | |
146 | posix_acl_release(res.acl_access); | |
147 | return res.acl_default; | |
b7fa0554 AG |
148 | } |
149 | ||
150 | getout: | |
b8a7a3a6 AG |
151 | nfs3_abort_get_acl(&inode->i_acl); |
152 | nfs3_abort_get_acl(&inode->i_default_acl); | |
b7fa0554 AG |
153 | posix_acl_release(res.acl_access); |
154 | posix_acl_release(res.acl_default); | |
6e94d629 | 155 | nfs_free_fattr(res.fattr); |
013cdf10 | 156 | return ERR_PTR(status); |
b7fa0554 AG |
157 | } |
158 | ||
8f493b9c | 159 | static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, |
013cdf10 | 160 | struct posix_acl *dfacl) |
b7fa0554 AG |
161 | { |
162 | struct nfs_server *server = NFS_SERVER(inode); | |
6e94d629 | 163 | struct nfs_fattr *fattr; |
ae46141f | 164 | struct page *pages[NFSACL_MAXPAGES]; |
b7fa0554 AG |
165 | struct nfs3_setaclargs args = { |
166 | .inode = inode, | |
167 | .mask = NFS_ACL, | |
168 | .acl_access = acl, | |
169 | .pages = pages, | |
170 | }; | |
dead28da CL |
171 | struct rpc_message msg = { |
172 | .rpc_argp = &args, | |
173 | .rpc_resp = &fattr, | |
174 | }; | |
f87d928f TM |
175 | int status = 0; |
176 | ||
177 | if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL)) | |
178 | goto out; | |
b7fa0554 AG |
179 | |
180 | status = -EOPNOTSUPP; | |
181 | if (!nfs_server_capable(inode, NFS_CAP_ACLS)) | |
182 | goto out; | |
183 | ||
f61f6da0 CL |
184 | /* We are doing this here because XDR marshalling does not |
185 | * return any results, it BUGs. */ | |
b7fa0554 AG |
186 | status = -ENOSPC; |
187 | if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) | |
188 | goto out; | |
189 | if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES) | |
190 | goto out; | |
191 | if (S_ISDIR(inode->i_mode)) { | |
192 | args.mask |= NFS_DFACL; | |
193 | args.acl_default = dfacl; | |
ae46141f TM |
194 | args.len = nfsacl_size(acl, dfacl); |
195 | } else | |
196 | args.len = nfsacl_size(acl, NULL); | |
197 | ||
198 | if (args.len > NFS_ACL_INLINE_BUFSIZE) { | |
199 | unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT); | |
200 | ||
201 | status = -ENOMEM; | |
202 | do { | |
203 | args.pages[args.npages] = alloc_page(GFP_KERNEL); | |
204 | if (args.pages[args.npages] == NULL) | |
205 | goto out_freepages; | |
206 | args.npages++; | |
207 | } while (args.npages < npages); | |
b7fa0554 AG |
208 | } |
209 | ||
210 | dprintk("NFS call setacl\n"); | |
6e94d629 TM |
211 | status = -ENOMEM; |
212 | fattr = nfs_alloc_fattr(); | |
213 | if (fattr == NULL) | |
214 | goto out_freepages; | |
215 | ||
dead28da | 216 | msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; |
6e94d629 | 217 | msg.rpc_resp = fattr; |
dead28da | 218 | status = rpc_call_sync(server->client_acl, &msg, 0); |
f41f7418 TM |
219 | nfs_access_zap_cache(inode); |
220 | nfs_zap_acl_cache(inode); | |
b7fa0554 AG |
221 | dprintk("NFS reply setacl: %d\n", status); |
222 | ||
b7fa0554 AG |
223 | switch (status) { |
224 | case 0: | |
6e94d629 | 225 | status = nfs_refresh_inode(inode, fattr); |
b7fa0554 AG |
226 | break; |
227 | case -EPFNOSUPPORT: | |
228 | case -EPROTONOSUPPORT: | |
229 | dprintk("NFS_V3_ACL SETACL RPC not supported" | |
230 | "(will not retry)\n"); | |
231 | server->caps &= ~NFS_CAP_ACLS; | |
df561f66 | 232 | fallthrough; |
b7fa0554 AG |
233 | case -ENOTSUPP: |
234 | status = -EOPNOTSUPP; | |
235 | } | |
6e94d629 | 236 | nfs_free_fattr(fattr); |
ae46141f TM |
237 | out_freepages: |
238 | while (args.npages != 0) { | |
239 | args.npages--; | |
240 | __free_page(args.pages[args.npages]); | |
241 | } | |
b7fa0554 AG |
242 | out: |
243 | return status; | |
244 | } | |
245 | ||
8f493b9c TM |
246 | int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, |
247 | struct posix_acl *dfacl) | |
248 | { | |
249 | int ret; | |
250 | ret = __nfs3_proc_setacls(inode, acl, dfacl); | |
251 | return (ret == -EOPNOTSUPP) ? 0 : ret; | |
252 | ||
253 | } | |
254 | ||
549c7297 CB |
255 | int nfs3_set_acl(struct user_namespace *mnt_userns, struct inode *inode, |
256 | struct posix_acl *acl, int type) | |
b7fa0554 | 257 | { |
7648f939 | 258 | struct posix_acl *orig = acl, *dfacl = NULL, *alloc; |
b7fa0554 AG |
259 | int status; |
260 | ||
261 | if (S_ISDIR(inode->i_mode)) { | |
262 | switch(type) { | |
013cdf10 | 263 | case ACL_TYPE_ACCESS: |
7648f939 | 264 | alloc = get_acl(inode, ACL_TYPE_DEFAULT); |
013cdf10 CH |
265 | if (IS_ERR(alloc)) |
266 | goto fail; | |
7648f939 | 267 | dfacl = alloc; |
013cdf10 CH |
268 | break; |
269 | ||
270 | case ACL_TYPE_DEFAULT: | |
7648f939 | 271 | alloc = get_acl(inode, ACL_TYPE_ACCESS); |
013cdf10 CH |
272 | if (IS_ERR(alloc)) |
273 | goto fail; | |
7648f939 AG |
274 | dfacl = acl; |
275 | acl = alloc; | |
013cdf10 | 276 | break; |
b7fa0554 | 277 | } |
013cdf10 | 278 | } |
b7fa0554 AG |
279 | |
280 | if (acl == NULL) { | |
7648f939 | 281 | alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
b7fa0554 AG |
282 | if (IS_ERR(alloc)) |
283 | goto fail; | |
7648f939 | 284 | acl = alloc; |
b7fa0554 | 285 | } |
8f493b9c | 286 | status = __nfs3_proc_setacls(inode, acl, dfacl); |
7648f939 AG |
287 | out: |
288 | if (acl != orig) | |
289 | posix_acl_release(acl); | |
290 | if (dfacl != orig) | |
291 | posix_acl_release(dfacl); | |
b7fa0554 AG |
292 | return status; |
293 | ||
294 | fail: | |
7648f939 AG |
295 | status = PTR_ERR(alloc); |
296 | goto out; | |
b7fa0554 | 297 | } |
055ffbea | 298 | |
013cdf10 CH |
299 | const struct xattr_handler *nfs3_xattr_handlers[] = { |
300 | &posix_acl_access_xattr_handler, | |
301 | &posix_acl_default_xattr_handler, | |
302 | NULL, | |
303 | }; | |
74adf83f CH |
304 | |
305 | static int | |
306 | nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data, | |
307 | size_t size, ssize_t *result) | |
308 | { | |
309 | struct posix_acl *acl; | |
310 | char *p = data + *result; | |
311 | ||
312 | acl = get_acl(inode, type); | |
7a9e75a1 | 313 | if (IS_ERR_OR_NULL(acl)) |
74adf83f CH |
314 | return 0; |
315 | ||
316 | posix_acl_release(acl); | |
317 | ||
318 | *result += strlen(name); | |
319 | *result += 1; | |
320 | if (!size) | |
321 | return 0; | |
322 | if (*result > size) | |
323 | return -ERANGE; | |
324 | ||
325 | strcpy(p, name); | |
326 | return 0; | |
327 | } | |
328 | ||
329 | ssize_t | |
330 | nfs3_listxattr(struct dentry *dentry, char *data, size_t size) | |
331 | { | |
2b0143b5 | 332 | struct inode *inode = d_inode(dentry); |
74adf83f CH |
333 | ssize_t result = 0; |
334 | int error; | |
335 | ||
336 | error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS, | |
97d79299 | 337 | XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result); |
74adf83f CH |
338 | if (error) |
339 | return error; | |
340 | ||
341 | error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT, | |
97d79299 | 342 | XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result); |
74adf83f CH |
343 | if (error) |
344 | return error; | |
345 | return result; | |
346 | } |