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Linux/fs/nfs/nfs4idmap.c

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  1 /*
  2  * fs/nfs/idmap.c
  3  *
  4  *  UID and GID to name mapping for clients.
  5  *
  6  *  Copyright (c) 2002 The Regents of the University of Michigan.
  7  *  All rights reserved.
  8  *
  9  *  Marius Aamodt Eriksen <marius@umich.edu>
 10  *
 11  *  Redistribution and use in source and binary forms, with or without
 12  *  modification, are permitted provided that the following conditions
 13  *  are met:
 14  *
 15  *  1. Redistributions of source code must retain the above copyright
 16  *     notice, this list of conditions and the following disclaimer.
 17  *  2. Redistributions in binary form must reproduce the above copyright
 18  *     notice, this list of conditions and the following disclaimer in the
 19  *     documentation and/or other materials provided with the distribution.
 20  *  3. Neither the name of the University nor the names of its
 21  *     contributors may be used to endorse or promote products derived
 22  *     from this software without specific prior written permission.
 23  *
 24  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 25  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 26  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 27  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 28  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 29  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 30  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 31  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 32  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 33  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 34  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 35  */
 36 #include <linux/types.h>
 37 #include <linux/parser.h>
 38 #include <linux/fs.h>
 39 #include <net/net_namespace.h>
 40 #include <linux/sunrpc/rpc_pipe_fs.h>
 41 #include <linux/nfs_fs.h>
 42 #include <linux/nfs_fs_sb.h>
 43 #include <linux/key.h>
 44 #include <linux/keyctl.h>
 45 #include <linux/key-type.h>
 46 #include <keys/user-type.h>
 47 #include <linux/module.h>
 48 
 49 #include "internal.h"
 50 #include "netns.h"
 51 #include "nfs4idmap.h"
 52 #include "nfs4trace.h"
 53 
 54 #define NFS_UINT_MAXLEN 11
 55 
 56 static const struct cred *id_resolver_cache;
 57 static struct key_type key_type_id_resolver_legacy;
 58 
 59 struct idmap_legacy_upcalldata {
 60         struct rpc_pipe_msg pipe_msg;
 61         struct idmap_msg idmap_msg;
 62         struct key_construction *key_cons;
 63         struct idmap *idmap;
 64 };
 65 
 66 struct idmap {
 67         struct rpc_pipe_dir_object idmap_pdo;
 68         struct rpc_pipe         *idmap_pipe;
 69         struct idmap_legacy_upcalldata *idmap_upcall_data;
 70         struct mutex            idmap_mutex;
 71 };
 72 
 73 /**
 74  * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
 75  * @fattr: fully initialised struct nfs_fattr
 76  * @owner_name: owner name string cache
 77  * @group_name: group name string cache
 78  */
 79 void nfs_fattr_init_names(struct nfs_fattr *fattr,
 80                 struct nfs4_string *owner_name,
 81                 struct nfs4_string *group_name)
 82 {
 83         fattr->owner_name = owner_name;
 84         fattr->group_name = group_name;
 85 }
 86 
 87 static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
 88 {
 89         fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
 90         kfree(fattr->owner_name->data);
 91 }
 92 
 93 static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
 94 {
 95         fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
 96         kfree(fattr->group_name->data);
 97 }
 98 
 99 static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
100 {
101         struct nfs4_string *owner = fattr->owner_name;
102         kuid_t uid;
103 
104         if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
105                 return false;
106         if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
107                 fattr->uid = uid;
108                 fattr->valid |= NFS_ATTR_FATTR_OWNER;
109         }
110         return true;
111 }
112 
113 static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
114 {
115         struct nfs4_string *group = fattr->group_name;
116         kgid_t gid;
117 
118         if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
119                 return false;
120         if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
121                 fattr->gid = gid;
122                 fattr->valid |= NFS_ATTR_FATTR_GROUP;
123         }
124         return true;
125 }
126 
127 /**
128  * nfs_fattr_free_names - free up the NFSv4 owner and group strings
129  * @fattr: a fully initialised nfs_fattr structure
130  */
131 void nfs_fattr_free_names(struct nfs_fattr *fattr)
132 {
133         if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
134                 nfs_fattr_free_owner_name(fattr);
135         if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
136                 nfs_fattr_free_group_name(fattr);
137 }
138 
139 /**
140  * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
141  * @server: pointer to the filesystem nfs_server structure
142  * @fattr: a fully initialised nfs_fattr structure
143  *
144  * This helper maps the cached NFSv4 owner/group strings in fattr into
145  * their numeric uid/gid equivalents, and then frees the cached strings.
146  */
147 void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
148 {
149         if (nfs_fattr_map_owner_name(server, fattr))
150                 nfs_fattr_free_owner_name(fattr);
151         if (nfs_fattr_map_group_name(server, fattr))
152                 nfs_fattr_free_group_name(fattr);
153 }
154 
155 int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
156 {
157         unsigned long val;
158         char buf[16];
159 
160         if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
161                 return 0;
162         memcpy(buf, name, namelen);
163         buf[namelen] = '\0';
164         if (kstrtoul(buf, 0, &val) != 0)
165                 return 0;
166         *res = val;
167         return 1;
168 }
169 EXPORT_SYMBOL_GPL(nfs_map_string_to_numeric);
170 
171 static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
172 {
173         return snprintf(buf, buflen, "%u", id);
174 }
175 
176 static struct key_type key_type_id_resolver = {
177         .name           = "id_resolver",
178         .preparse       = user_preparse,
179         .free_preparse  = user_free_preparse,
180         .instantiate    = generic_key_instantiate,
181         .revoke         = user_revoke,
182         .destroy        = user_destroy,
183         .describe       = user_describe,
184         .read           = user_read,
185 };
186 
187 int nfs_idmap_init(void)
188 {
189         struct cred *cred;
190         struct key *keyring;
191         int ret = 0;
192 
193         printk(KERN_NOTICE "NFS: Registering the %s key type\n",
194                 key_type_id_resolver.name);
195 
196         cred = prepare_kernel_cred(NULL);
197         if (!cred)
198                 return -ENOMEM;
199 
200         keyring = keyring_alloc(".id_resolver",
201                                 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
202                                 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
203                                 KEY_USR_VIEW | KEY_USR_READ,
204                                 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
205         if (IS_ERR(keyring)) {
206                 ret = PTR_ERR(keyring);
207                 goto failed_put_cred;
208         }
209 
210         ret = register_key_type(&key_type_id_resolver);
211         if (ret < 0)
212                 goto failed_put_key;
213 
214         ret = register_key_type(&key_type_id_resolver_legacy);
215         if (ret < 0)
216                 goto failed_reg_legacy;
217 
218         set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
219         cred->thread_keyring = keyring;
220         cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
221         id_resolver_cache = cred;
222         return 0;
223 
224 failed_reg_legacy:
225         unregister_key_type(&key_type_id_resolver);
226 failed_put_key:
227         key_put(keyring);
228 failed_put_cred:
229         put_cred(cred);
230         return ret;
231 }
232 
233 void nfs_idmap_quit(void)
234 {
235         key_revoke(id_resolver_cache->thread_keyring);
236         unregister_key_type(&key_type_id_resolver);
237         unregister_key_type(&key_type_id_resolver_legacy);
238         put_cred(id_resolver_cache);
239 }
240 
241 /*
242  * Assemble the description to pass to request_key()
243  * This function will allocate a new string and update dest to point
244  * at it.  The caller is responsible for freeing dest.
245  *
246  * On error 0 is returned.  Otherwise, the length of dest is returned.
247  */
248 static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
249                                 const char *type, size_t typelen, char **desc)
250 {
251         char *cp;
252         size_t desclen = typelen + namelen + 2;
253 
254         *desc = kmalloc(desclen, GFP_KERNEL);
255         if (!*desc)
256                 return -ENOMEM;
257 
258         cp = *desc;
259         memcpy(cp, type, typelen);
260         cp += typelen;
261         *cp++ = ':';
262 
263         memcpy(cp, name, namelen);
264         cp += namelen;
265         *cp = '\0';
266         return desclen;
267 }
268 
269 static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
270                                          const char *type, struct idmap *idmap)
271 {
272         char *desc;
273         struct key *rkey;
274         ssize_t ret;
275 
276         ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
277         if (ret < 0)
278                 return ERR_PTR(ret);
279 
280         rkey = request_key(&key_type_id_resolver, desc, "");
281         if (IS_ERR(rkey)) {
282                 mutex_lock(&idmap->idmap_mutex);
283                 rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
284                                                 desc, "", 0, idmap);
285                 mutex_unlock(&idmap->idmap_mutex);
286         }
287         if (!IS_ERR(rkey))
288                 set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
289 
290         kfree(desc);
291         return rkey;
292 }
293 
294 static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
295                                  const char *type, void *data,
296                                  size_t data_size, struct idmap *idmap)
297 {
298         const struct cred *saved_cred;
299         struct key *rkey;
300         const struct user_key_payload *payload;
301         ssize_t ret;
302 
303         saved_cred = override_creds(id_resolver_cache);
304         rkey = nfs_idmap_request_key(name, namelen, type, idmap);
305         revert_creds(saved_cred);
306 
307         if (IS_ERR(rkey)) {
308                 ret = PTR_ERR(rkey);
309                 goto out;
310         }
311 
312         rcu_read_lock();
313         rkey->perm |= KEY_USR_VIEW;
314 
315         ret = key_validate(rkey);
316         if (ret < 0)
317                 goto out_up;
318 
319         payload = user_key_payload_rcu(rkey);
320         if (IS_ERR_OR_NULL(payload)) {
321                 ret = PTR_ERR(payload);
322                 goto out_up;
323         }
324 
325         ret = payload->datalen;
326         if (ret > 0 && ret <= data_size)
327                 memcpy(data, payload->data, ret);
328         else
329                 ret = -EINVAL;
330 
331 out_up:
332         rcu_read_unlock();
333         key_put(rkey);
334 out:
335         return ret;
336 }
337 
338 /* ID -> Name */
339 static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
340                                      size_t buflen, struct idmap *idmap)
341 {
342         char id_str[NFS_UINT_MAXLEN];
343         int id_len;
344         ssize_t ret;
345 
346         id_len = nfs_map_numeric_to_string(id, id_str, sizeof(id_str));
347         ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
348         if (ret < 0)
349                 return -EINVAL;
350         return ret;
351 }
352 
353 /* Name -> ID */
354 static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
355                                __u32 *id, struct idmap *idmap)
356 {
357         char id_str[NFS_UINT_MAXLEN];
358         long id_long;
359         ssize_t data_size;
360         int ret = 0;
361 
362         data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
363         if (data_size <= 0) {
364                 ret = -EINVAL;
365         } else {
366                 ret = kstrtol(id_str, 10, &id_long);
367                 if (!ret)
368                         *id = (__u32)id_long;
369         }
370         return ret;
371 }
372 
373 /* idmap classic begins here */
374 
375 enum {
376         Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
377 };
378 
379 static const match_table_t nfs_idmap_tokens = {
380         { Opt_find_uid, "uid:%s" },
381         { Opt_find_gid, "gid:%s" },
382         { Opt_find_user, "user:%s" },
383         { Opt_find_group, "group:%s" },
384         { Opt_find_err, NULL }
385 };
386 
387 static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
388 static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
389                                    size_t);
390 static void idmap_release_pipe(struct inode *);
391 static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
392 
393 static const struct rpc_pipe_ops idmap_upcall_ops = {
394         .upcall         = rpc_pipe_generic_upcall,
395         .downcall       = idmap_pipe_downcall,
396         .release_pipe   = idmap_release_pipe,
397         .destroy_msg    = idmap_pipe_destroy_msg,
398 };
399 
400 static struct key_type key_type_id_resolver_legacy = {
401         .name           = "id_legacy",
402         .preparse       = user_preparse,
403         .free_preparse  = user_free_preparse,
404         .instantiate    = generic_key_instantiate,
405         .revoke         = user_revoke,
406         .destroy        = user_destroy,
407         .describe       = user_describe,
408         .read           = user_read,
409         .request_key    = nfs_idmap_legacy_upcall,
410 };
411 
412 static void nfs_idmap_pipe_destroy(struct dentry *dir,
413                 struct rpc_pipe_dir_object *pdo)
414 {
415         struct idmap *idmap = pdo->pdo_data;
416         struct rpc_pipe *pipe = idmap->idmap_pipe;
417 
418         if (pipe->dentry) {
419                 rpc_unlink(pipe->dentry);
420                 pipe->dentry = NULL;
421         }
422 }
423 
424 static int nfs_idmap_pipe_create(struct dentry *dir,
425                 struct rpc_pipe_dir_object *pdo)
426 {
427         struct idmap *idmap = pdo->pdo_data;
428         struct rpc_pipe *pipe = idmap->idmap_pipe;
429         struct dentry *dentry;
430 
431         dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
432         if (IS_ERR(dentry))
433                 return PTR_ERR(dentry);
434         pipe->dentry = dentry;
435         return 0;
436 }
437 
438 static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = {
439         .create = nfs_idmap_pipe_create,
440         .destroy = nfs_idmap_pipe_destroy,
441 };
442 
443 int
444 nfs_idmap_new(struct nfs_client *clp)
445 {
446         struct idmap *idmap;
447         struct rpc_pipe *pipe;
448         int error;
449 
450         idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
451         if (idmap == NULL)
452                 return -ENOMEM;
453 
454         rpc_init_pipe_dir_object(&idmap->idmap_pdo,
455                         &nfs_idmap_pipe_dir_object_ops,
456                         idmap);
457 
458         pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
459         if (IS_ERR(pipe)) {
460                 error = PTR_ERR(pipe);
461                 goto err;
462         }
463         idmap->idmap_pipe = pipe;
464         mutex_init(&idmap->idmap_mutex);
465 
466         error = rpc_add_pipe_dir_object(clp->cl_net,
467                         &clp->cl_rpcclient->cl_pipedir_objects,
468                         &idmap->idmap_pdo);
469         if (error)
470                 goto err_destroy_pipe;
471 
472         clp->cl_idmap = idmap;
473         return 0;
474 err_destroy_pipe:
475         rpc_destroy_pipe_data(idmap->idmap_pipe);
476 err:
477         kfree(idmap);
478         return error;
479 }
480 
481 void
482 nfs_idmap_delete(struct nfs_client *clp)
483 {
484         struct idmap *idmap = clp->cl_idmap;
485 
486         if (!idmap)
487                 return;
488         clp->cl_idmap = NULL;
489         rpc_remove_pipe_dir_object(clp->cl_net,
490                         &clp->cl_rpcclient->cl_pipedir_objects,
491                         &idmap->idmap_pdo);
492         rpc_destroy_pipe_data(idmap->idmap_pipe);
493         kfree(idmap);
494 }
495 
496 static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
497                                      struct idmap_msg *im,
498                                      struct rpc_pipe_msg *msg)
499 {
500         substring_t substr;
501         int token, ret;
502 
503         im->im_type = IDMAP_TYPE_GROUP;
504         token = match_token(desc, nfs_idmap_tokens, &substr);
505 
506         switch (token) {
507         case Opt_find_uid:
508                 im->im_type = IDMAP_TYPE_USER;
509                 /* Fall through */
510         case Opt_find_gid:
511                 im->im_conv = IDMAP_CONV_NAMETOID;
512                 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
513                 break;
514 
515         case Opt_find_user:
516                 im->im_type = IDMAP_TYPE_USER;
517                 /* Fall through */
518         case Opt_find_group:
519                 im->im_conv = IDMAP_CONV_IDTONAME;
520                 ret = match_int(&substr, &im->im_id);
521                 if (ret)
522                         goto out;
523                 break;
524 
525         default:
526                 ret = -EINVAL;
527                 goto out;
528         }
529 
530         msg->data = im;
531         msg->len  = sizeof(struct idmap_msg);
532 
533 out:
534         return ret;
535 }
536 
537 static bool
538 nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
539                 struct idmap_legacy_upcalldata *data)
540 {
541         if (idmap->idmap_upcall_data != NULL) {
542                 WARN_ON_ONCE(1);
543                 return false;
544         }
545         idmap->idmap_upcall_data = data;
546         return true;
547 }
548 
549 static void
550 nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret)
551 {
552         struct key_construction *cons = idmap->idmap_upcall_data->key_cons;
553 
554         kfree(idmap->idmap_upcall_data);
555         idmap->idmap_upcall_data = NULL;
556         complete_request_key(cons, ret);
557 }
558 
559 static void
560 nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret)
561 {
562         if (idmap->idmap_upcall_data != NULL)
563                 nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
564 }
565 
566 static int nfs_idmap_legacy_upcall(struct key_construction *cons,
567                                    const char *op,
568                                    void *aux)
569 {
570         struct idmap_legacy_upcalldata *data;
571         struct rpc_pipe_msg *msg;
572         struct idmap_msg *im;
573         struct idmap *idmap = (struct idmap *)aux;
574         struct key *key = cons->key;
575         int ret = -ENOKEY;
576 
577         if (!aux)
578                 goto out1;
579 
580         /* msg and im are freed in idmap_pipe_destroy_msg */
581         ret = -ENOMEM;
582         data = kzalloc(sizeof(*data), GFP_KERNEL);
583         if (!data)
584                 goto out1;
585 
586         msg = &data->pipe_msg;
587         im = &data->idmap_msg;
588         data->idmap = idmap;
589         data->key_cons = cons;
590 
591         ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
592         if (ret < 0)
593                 goto out2;
594 
595         ret = -EAGAIN;
596         if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
597                 goto out2;
598 
599         ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
600         if (ret < 0)
601                 nfs_idmap_abort_pipe_upcall(idmap, ret);
602 
603         return ret;
604 out2:
605         kfree(data);
606 out1:
607         complete_request_key(cons, ret);
608         return ret;
609 }
610 
611 static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)
612 {
613         return key_instantiate_and_link(key, data, datalen,
614                                         id_resolver_cache->thread_keyring,
615                                         authkey);
616 }
617 
618 static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
619                 struct idmap_msg *upcall,
620                 struct key *key, struct key *authkey)
621 {
622         char id_str[NFS_UINT_MAXLEN];
623         size_t len;
624         int ret = -ENOKEY;
625 
626         /* ret = -ENOKEY */
627         if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
628                 goto out;
629         switch (im->im_conv) {
630         case IDMAP_CONV_NAMETOID:
631                 if (strcmp(upcall->im_name, im->im_name) != 0)
632                         break;
633                 /* Note: here we store the NUL terminator too */
634                 len = 1 + nfs_map_numeric_to_string(im->im_id, id_str,
635                                                     sizeof(id_str));
636                 ret = nfs_idmap_instantiate(key, authkey, id_str, len);
637                 break;
638         case IDMAP_CONV_IDTONAME:
639                 if (upcall->im_id != im->im_id)
640                         break;
641                 len = strlen(im->im_name);
642                 ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);
643                 break;
644         default:
645                 ret = -EINVAL;
646         }
647 out:
648         return ret;
649 }
650 
651 static ssize_t
652 idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
653 {
654         struct rpc_inode *rpci = RPC_I(file_inode(filp));
655         struct idmap *idmap = (struct idmap *)rpci->private;
656         struct key_construction *cons;
657         struct idmap_msg im;
658         size_t namelen_in;
659         int ret = -ENOKEY;
660 
661         /* If instantiation is successful, anyone waiting for key construction
662          * will have been woken up and someone else may now have used
663          * idmap_key_cons - so after this point we may no longer touch it.
664          */
665         if (idmap->idmap_upcall_data == NULL)
666                 goto out_noupcall;
667 
668         cons = idmap->idmap_upcall_data->key_cons;
669 
670         if (mlen != sizeof(im)) {
671                 ret = -ENOSPC;
672                 goto out;
673         }
674 
675         if (copy_from_user(&im, src, mlen) != 0) {
676                 ret = -EFAULT;
677                 goto out;
678         }
679 
680         if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
681                 ret = -ENOKEY;
682                 goto out;
683         }
684 
685         namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
686         if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
687                 ret = -EINVAL;
688                 goto out;
689 }
690 
691         ret = nfs_idmap_read_and_verify_message(&im,
692                         &idmap->idmap_upcall_data->idmap_msg,
693                         cons->key, cons->authkey);
694         if (ret >= 0) {
695                 key_set_timeout(cons->key, nfs_idmap_cache_timeout);
696                 ret = mlen;
697         }
698 
699 out:
700         nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
701 out_noupcall:
702         return ret;
703 }
704 
705 static void
706 idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
707 {
708         struct idmap_legacy_upcalldata *data = container_of(msg,
709                         struct idmap_legacy_upcalldata,
710                         pipe_msg);
711         struct idmap *idmap = data->idmap;
712 
713         if (msg->errno)
714                 nfs_idmap_abort_pipe_upcall(idmap, msg->errno);
715 }
716 
717 static void
718 idmap_release_pipe(struct inode *inode)
719 {
720         struct rpc_inode *rpci = RPC_I(inode);
721         struct idmap *idmap = (struct idmap *)rpci->private;
722 
723         nfs_idmap_abort_pipe_upcall(idmap, -EPIPE);
724 }
725 
726 int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid)
727 {
728         struct idmap *idmap = server->nfs_client->cl_idmap;
729         __u32 id = -1;
730         int ret = 0;
731 
732         if (!nfs_map_string_to_numeric(name, namelen, &id))
733                 ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap);
734         if (ret == 0) {
735                 *uid = make_kuid(&init_user_ns, id);
736                 if (!uid_valid(*uid))
737                         ret = -ERANGE;
738         }
739         trace_nfs4_map_name_to_uid(name, namelen, id, ret);
740         return ret;
741 }
742 
743 int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid)
744 {
745         struct idmap *idmap = server->nfs_client->cl_idmap;
746         __u32 id = -1;
747         int ret = 0;
748 
749         if (!nfs_map_string_to_numeric(name, namelen, &id))
750                 ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap);
751         if (ret == 0) {
752                 *gid = make_kgid(&init_user_ns, id);
753                 if (!gid_valid(*gid))
754                         ret = -ERANGE;
755         }
756         trace_nfs4_map_group_to_gid(name, namelen, id, ret);
757         return ret;
758 }
759 
760 int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen)
761 {
762         struct idmap *idmap = server->nfs_client->cl_idmap;
763         int ret = -EINVAL;
764         __u32 id;
765 
766         id = from_kuid(&init_user_ns, uid);
767         if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
768                 ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
769         if (ret < 0)
770                 ret = nfs_map_numeric_to_string(id, buf, buflen);
771         trace_nfs4_map_uid_to_name(buf, ret, id, ret);
772         return ret;
773 }
774 int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
775 {
776         struct idmap *idmap = server->nfs_client->cl_idmap;
777         int ret = -EINVAL;
778         __u32 id;
779 
780         id = from_kgid(&init_user_ns, gid);
781         if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
782                 ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
783         if (ret < 0)
784                 ret = nfs_map_numeric_to_string(id, buf, buflen);
785         trace_nfs4_map_gid_to_group(buf, ret, id, ret);
786         return ret;
787 }
788 

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