afs: check function return
[linux-2.6-microblaze.git] / fs / cifs / ioctl.c
1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3  *   fs/cifs/ioctl.c
4  *
5  *   vfs operations that deal with io control
6  *
7  *   Copyright (C) International Business Machines  Corp., 2005,2013
8  *   Author(s): Steve French (sfrench@us.ibm.com)
9  *
10  */
11
12 #include <linux/fs.h>
13 #include <linux/file.h>
14 #include <linux/mount.h>
15 #include <linux/mm.h>
16 #include <linux/pagemap.h>
17 #include "cifspdu.h"
18 #include "cifsglob.h"
19 #include "cifsproto.h"
20 #include "cifs_debug.h"
21 #include "cifsfs.h"
22 #include "cifs_ioctl.h"
23 #include "smb2proto.h"
24 #include "smb2glob.h"
25 #include <linux/btrfs.h>
26
27 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
28                                   unsigned long p)
29 {
30         struct inode *inode = file_inode(filep);
31         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
32         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
33         struct dentry *dentry = filep->f_path.dentry;
34         const unsigned char *path;
35         void *page = alloc_dentry_path();
36         __le16 *utf16_path = NULL, root_path;
37         int rc = 0;
38
39         path = build_path_from_dentry(dentry, page);
40         if (IS_ERR(path)) {
41                 free_dentry_path(page);
42                 return PTR_ERR(path);
43         }
44
45         cifs_dbg(FYI, "%s %s\n", __func__, path);
46
47         if (!path[0]) {
48                 root_path = 0;
49                 utf16_path = &root_path;
50         } else {
51                 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
52                 if (!utf16_path) {
53                         rc = -ENOMEM;
54                         goto ici_exit;
55                 }
56         }
57
58         if (tcon->ses->server->ops->ioctl_query_info)
59                 rc = tcon->ses->server->ops->ioctl_query_info(
60                                 xid, tcon, cifs_sb, utf16_path,
61                                 filep->private_data ? 0 : 1, p);
62         else
63                 rc = -EOPNOTSUPP;
64
65  ici_exit:
66         if (utf16_path != &root_path)
67                 kfree(utf16_path);
68         free_dentry_path(page);
69         return rc;
70 }
71
72 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
73                         unsigned long srcfd)
74 {
75         int rc;
76         struct fd src_file;
77         struct inode *src_inode;
78
79         cifs_dbg(FYI, "ioctl copychunk range\n");
80         /* the destination must be opened for writing */
81         if (!(dst_file->f_mode & FMODE_WRITE)) {
82                 cifs_dbg(FYI, "file target not open for write\n");
83                 return -EINVAL;
84         }
85
86         /* check if target volume is readonly and take reference */
87         rc = mnt_want_write_file(dst_file);
88         if (rc) {
89                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
90                 return rc;
91         }
92
93         src_file = fdget(srcfd);
94         if (!src_file.file) {
95                 rc = -EBADF;
96                 goto out_drop_write;
97         }
98
99         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
100                 rc = -EBADF;
101                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
102                 goto out_fput;
103         }
104
105         src_inode = file_inode(src_file.file);
106         rc = -EINVAL;
107         if (S_ISDIR(src_inode->i_mode))
108                 goto out_fput;
109
110         rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
111                                         src_inode->i_size, 0);
112         if (rc > 0)
113                 rc = 0;
114 out_fput:
115         fdput(src_file);
116 out_drop_write:
117         mnt_drop_write_file(dst_file);
118         return rc;
119 }
120
121 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
122                                 void __user *arg)
123 {
124         int rc = 0;
125         struct smb_mnt_fs_info *fsinf;
126
127         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
128         if (fsinf == NULL)
129                 return -ENOMEM;
130
131         fsinf->version = 1;
132         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
133         fsinf->device_characteristics =
134                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
135         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
136         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
137         fsinf->max_path_component =
138                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
139         fsinf->vol_serial_number = tcon->vol_serial_number;
140         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
141         fsinf->share_flags = tcon->share_flags;
142         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
143         fsinf->sector_flags = tcon->ss_flags;
144         fsinf->optimal_sector_size = tcon->perf_sector_size;
145         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
146         fsinf->maximal_access = tcon->maximal_access;
147         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
148
149         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
150                 rc = -EFAULT;
151
152         kfree(fsinf);
153         return rc;
154 }
155
156 static int cifs_shutdown(struct super_block *sb, unsigned long arg)
157 {
158         struct cifs_sb_info *sbi = CIFS_SB(sb);
159         __u32 flags;
160
161         if (!capable(CAP_SYS_ADMIN))
162                 return -EPERM;
163
164         if (get_user(flags, (__u32 __user *)arg))
165                 return -EFAULT;
166
167         if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH)
168                 return -EINVAL;
169
170         if (cifs_forced_shutdown(sbi))
171                 return 0;
172
173         cifs_dbg(VFS, "shut down requested (%d)", flags);
174 /*      trace_cifs_shutdown(sb, flags);*/
175
176         /*
177          * see:
178          *   https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html
179          * for more information and description of original intent of the flags
180          */
181         switch (flags) {
182         /*
183          * We could add support later for default flag which requires:
184          *     "Flush all dirty data and metadata to disk"
185          * would need to call syncfs or equivalent to flush page cache for
186          * the mount and then issue fsync to server (if nostrictsync not set)
187          */
188         case CIFS_GOING_FLAGS_DEFAULT:
189                 cifs_dbg(FYI, "shutdown with default flag not supported\n");
190                 return -EINVAL;
191         /*
192          * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not
193          * data) but metadata writes are not cached on the client, so can treat
194          * it similarly to NOLOGFLUSH
195          */
196         case CIFS_GOING_FLAGS_LOGFLUSH:
197         case CIFS_GOING_FLAGS_NOLOGFLUSH:
198                 sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN;
199                 return 0;
200         default:
201                 return -EINVAL;
202         }
203         return 0;
204 }
205
206 static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in)
207 {
208         struct smb3_full_key_debug_info out;
209         struct cifs_ses *ses;
210         int rc = 0;
211         bool found = false;
212         u8 __user *end;
213
214         if (!smb3_encryption_required(tcon)) {
215                 rc = -EOPNOTSUPP;
216                 goto out;
217         }
218
219         /* copy user input into our output buffer */
220         if (copy_from_user(&out, in, sizeof(out))) {
221                 rc = -EINVAL;
222                 goto out;
223         }
224
225         if (!out.session_id) {
226                 /* if ses id is 0, use current user session */
227                 ses = tcon->ses;
228         } else {
229                 /* otherwise if a session id is given, look for it in all our sessions */
230                 struct cifs_ses *ses_it = NULL;
231                 struct TCP_Server_Info *server_it = NULL;
232
233                 spin_lock(&cifs_tcp_ses_lock);
234                 list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) {
235                         list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) {
236                                 if (ses_it->Suid == out.session_id) {
237                                         ses = ses_it;
238                                         /*
239                                          * since we are using the session outside the crit
240                                          * section, we need to make sure it won't be released
241                                          * so increment its refcount
242                                          */
243                                         ses->ses_count++;
244                                         found = true;
245                                         goto search_end;
246                                 }
247                         }
248                 }
249 search_end:
250                 spin_unlock(&cifs_tcp_ses_lock);
251                 if (!found) {
252                         rc = -ENOENT;
253                         goto out;
254                 }
255         }
256
257         switch (ses->server->cipher_type) {
258         case SMB2_ENCRYPTION_AES128_CCM:
259         case SMB2_ENCRYPTION_AES128_GCM:
260                 out.session_key_length = CIFS_SESS_KEY_SIZE;
261                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE;
262                 break;
263         case SMB2_ENCRYPTION_AES256_CCM:
264         case SMB2_ENCRYPTION_AES256_GCM:
265                 out.session_key_length = CIFS_SESS_KEY_SIZE;
266                 out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE;
267                 break;
268         default:
269                 rc = -EOPNOTSUPP;
270                 goto out;
271         }
272
273         /* check if user buffer is big enough to store all the keys */
274         if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length
275             + out.server_out_key_length) {
276                 rc = -ENOBUFS;
277                 goto out;
278         }
279
280         out.session_id = ses->Suid;
281         out.cipher_type = le16_to_cpu(ses->server->cipher_type);
282
283         /* overwrite user input with our output */
284         if (copy_to_user(in, &out, sizeof(out))) {
285                 rc = -EINVAL;
286                 goto out;
287         }
288
289         /* append all the keys at the end of the user buffer */
290         end = in->data;
291         if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) {
292                 rc = -EINVAL;
293                 goto out;
294         }
295         end += out.session_key_length;
296
297         if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) {
298                 rc = -EINVAL;
299                 goto out;
300         }
301         end += out.server_in_key_length;
302
303         if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) {
304                 rc = -EINVAL;
305                 goto out;
306         }
307
308 out:
309         if (found)
310                 cifs_put_smb_ses(ses);
311         return rc;
312 }
313
314 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
315 {
316         struct inode *inode = file_inode(filep);
317         struct smb3_key_debug_info pkey_inf;
318         int rc = -ENOTTY; /* strange error - but the precedent */
319         unsigned int xid;
320         struct cifsFileInfo *pSMBFile = filep->private_data;
321         struct cifs_tcon *tcon;
322         struct tcon_link *tlink;
323         struct cifs_sb_info *cifs_sb;
324         __u64   ExtAttrBits = 0;
325         __u64   caps;
326
327         xid = get_xid();
328
329         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
330         switch (command) {
331                 case FS_IOC_GETFLAGS:
332                         if (pSMBFile == NULL)
333                                 break;
334                         tcon = tlink_tcon(pSMBFile->tlink);
335                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
336 #ifdef CONFIG_CIFS_POSIX
337                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
338                                 __u64   ExtAttrMask = 0;
339                                 rc = CIFSGetExtAttr(xid, tcon,
340                                                     pSMBFile->fid.netfid,
341                                                     &ExtAttrBits, &ExtAttrMask);
342                                 if (rc == 0)
343                                         rc = put_user(ExtAttrBits &
344                                                 FS_FL_USER_VISIBLE,
345                                                 (int __user *)arg);
346                                 if (rc != EOPNOTSUPP)
347                                         break;
348                         }
349 #endif /* CONFIG_CIFS_POSIX */
350                         rc = 0;
351                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
352                                 /* add in the compressed bit */
353                                 ExtAttrBits = FS_COMPR_FL;
354                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
355                                               (int __user *)arg);
356                         }
357                         break;
358                 case FS_IOC_SETFLAGS:
359                         if (pSMBFile == NULL)
360                                 break;
361                         tcon = tlink_tcon(pSMBFile->tlink);
362                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
363
364                         if (get_user(ExtAttrBits, (int __user *)arg)) {
365                                 rc = -EFAULT;
366                                 break;
367                         }
368
369                         /*
370                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
371                          *      rc = CIFSSetExtAttr(xid, tcon,
372                          *                     pSMBFile->fid.netfid,
373                          *                     extAttrBits,
374                          *                     &ExtAttrMask);
375                          * if (rc != EOPNOTSUPP)
376                          *      break;
377                          */
378
379                         /* Currently only flag we can set is compressed flag */
380                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
381                                 break;
382
383                         /* Try to set compress flag */
384                         if (tcon->ses->server->ops->set_compression) {
385                                 rc = tcon->ses->server->ops->set_compression(
386                                                         xid, tcon, pSMBFile);
387                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
388                         }
389                         break;
390                 case CIFS_IOC_COPYCHUNK_FILE:
391                         rc = cifs_ioctl_copychunk(xid, filep, arg);
392                         break;
393                 case CIFS_QUERY_INFO:
394                         rc = cifs_ioctl_query_info(xid, filep, arg);
395                         break;
396                 case CIFS_IOC_SET_INTEGRITY:
397                         if (pSMBFile == NULL)
398                                 break;
399                         tcon = tlink_tcon(pSMBFile->tlink);
400                         if (tcon->ses->server->ops->set_integrity)
401                                 rc = tcon->ses->server->ops->set_integrity(xid,
402                                                 tcon, pSMBFile);
403                         else
404                                 rc = -EOPNOTSUPP;
405                         break;
406                 case CIFS_IOC_GET_MNT_INFO:
407                         if (pSMBFile == NULL)
408                                 break;
409                         tcon = tlink_tcon(pSMBFile->tlink);
410                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
411                         break;
412                 case CIFS_ENUMERATE_SNAPSHOTS:
413                         if (pSMBFile == NULL)
414                                 break;
415                         if (arg == 0) {
416                                 rc = -EINVAL;
417                                 goto cifs_ioc_exit;
418                         }
419                         tcon = tlink_tcon(pSMBFile->tlink);
420                         if (tcon->ses->server->ops->enum_snapshots)
421                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
422                                                 pSMBFile, (void __user *)arg);
423                         else
424                                 rc = -EOPNOTSUPP;
425                         break;
426                 case CIFS_DUMP_KEY:
427                         /*
428                          * Dump encryption keys. This is an old ioctl that only
429                          * handles AES-128-{CCM,GCM}.
430                          */
431                         if (pSMBFile == NULL)
432                                 break;
433                         if (!capable(CAP_SYS_ADMIN)) {
434                                 rc = -EACCES;
435                                 break;
436                         }
437
438                         tcon = tlink_tcon(pSMBFile->tlink);
439                         if (!smb3_encryption_required(tcon)) {
440                                 rc = -EOPNOTSUPP;
441                                 break;
442                         }
443                         pkey_inf.cipher_type =
444                                 le16_to_cpu(tcon->ses->server->cipher_type);
445                         pkey_inf.Suid = tcon->ses->Suid;
446                         memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
447                                         16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
448                         memcpy(pkey_inf.smb3decryptionkey,
449                               tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
450                         memcpy(pkey_inf.smb3encryptionkey,
451                               tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
452                         if (copy_to_user((void __user *)arg, &pkey_inf,
453                                         sizeof(struct smb3_key_debug_info)))
454                                 rc = -EFAULT;
455                         else
456                                 rc = 0;
457                         break;
458                 case CIFS_DUMP_FULL_KEY:
459                         /*
460                          * Dump encryption keys (handles any key sizes)
461                          */
462                         if (pSMBFile == NULL)
463                                 break;
464                         if (!capable(CAP_SYS_ADMIN)) {
465                                 rc = -EACCES;
466                                 break;
467                         }
468                         tcon = tlink_tcon(pSMBFile->tlink);
469                         rc = cifs_dump_full_key(tcon, (void __user *)arg);
470                         break;
471                 case CIFS_IOC_NOTIFY:
472                         if (!S_ISDIR(inode->i_mode)) {
473                                 /* Notify can only be done on directories */
474                                 rc = -EOPNOTSUPP;
475                                 break;
476                         }
477                         cifs_sb = CIFS_SB(inode->i_sb);
478                         tlink = cifs_sb_tlink(cifs_sb);
479                         if (IS_ERR(tlink)) {
480                                 rc = PTR_ERR(tlink);
481                                 break;
482                         }
483                         tcon = tlink_tcon(tlink);
484                         if (tcon && tcon->ses->server->ops->notify) {
485                                 rc = tcon->ses->server->ops->notify(xid,
486                                                 filep, (void __user *)arg);
487                                 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
488                         } else
489                                 rc = -EOPNOTSUPP;
490                         cifs_put_tlink(tlink);
491                         break;
492                 case CIFS_IOC_SHUTDOWN:
493                         rc = cifs_shutdown(inode->i_sb, arg);
494                         break;
495                 default:
496                         cifs_dbg(FYI, "unsupported ioctl\n");
497                         break;
498         }
499 cifs_ioc_exit:
500         free_xid(xid);
501         return rc;
502 }