2 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <sys/param.h>
30 #include <sys/capsicum.h>
31 #include <sys/filedesc.h>
34 #include <sys/socketvar.h>
35 #include <sys/syscallsubr.h>
36 #include <sys/sysproto.h>
37 #include <sys/systm.h>
38 #include <sys/unistd.h>
39 #include <sys/vnode.h>
41 #include <contrib/cloudabi/cloudabi_types_common.h>
43 #include <compat/cloudabi/cloudabi_proto.h>
44 #include <compat/cloudabi/cloudabi_util.h>
46 /* Translation between CloudABI and Capsicum rights. */
47 #define RIGHTS_MAPPINGS \
48 MAPPING(CLOUDABI_RIGHT_FD_DATASYNC, CAP_FSYNC) \
49 MAPPING(CLOUDABI_RIGHT_FD_READ, CAP_READ) \
50 MAPPING(CLOUDABI_RIGHT_FD_SEEK, CAP_SEEK) \
51 MAPPING(CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS, CAP_FCNTL) \
52 MAPPING(CLOUDABI_RIGHT_FD_SYNC, CAP_FSYNC) \
53 MAPPING(CLOUDABI_RIGHT_FD_TELL, CAP_SEEK_TELL) \
54 MAPPING(CLOUDABI_RIGHT_FD_WRITE, CAP_WRITE) \
55 MAPPING(CLOUDABI_RIGHT_FILE_ADVISE) \
56 MAPPING(CLOUDABI_RIGHT_FILE_ALLOCATE, CAP_WRITE) \
57 MAPPING(CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY, CAP_MKDIRAT) \
58 MAPPING(CLOUDABI_RIGHT_FILE_CREATE_FILE, CAP_CREATE) \
59 MAPPING(CLOUDABI_RIGHT_FILE_LINK_SOURCE, CAP_LINKAT_SOURCE) \
60 MAPPING(CLOUDABI_RIGHT_FILE_LINK_TARGET, CAP_LINKAT_TARGET) \
61 MAPPING(CLOUDABI_RIGHT_FILE_OPEN, CAP_LOOKUP) \
62 MAPPING(CLOUDABI_RIGHT_FILE_READDIR, CAP_READ) \
63 MAPPING(CLOUDABI_RIGHT_FILE_READLINK, CAP_LOOKUP) \
64 MAPPING(CLOUDABI_RIGHT_FILE_RENAME_SOURCE, CAP_RENAMEAT_SOURCE) \
65 MAPPING(CLOUDABI_RIGHT_FILE_RENAME_TARGET, CAP_RENAMEAT_TARGET) \
66 MAPPING(CLOUDABI_RIGHT_FILE_STAT_FGET, CAP_FSTAT) \
67 MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE, CAP_FTRUNCATE) \
68 MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES, CAP_FUTIMES) \
69 MAPPING(CLOUDABI_RIGHT_FILE_STAT_GET, CAP_FSTATAT) \
70 MAPPING(CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES, CAP_FUTIMESAT) \
71 MAPPING(CLOUDABI_RIGHT_FILE_SYMLINK, CAP_SYMLINKAT) \
72 MAPPING(CLOUDABI_RIGHT_FILE_UNLINK, CAP_UNLINKAT) \
73 MAPPING(CLOUDABI_RIGHT_MEM_MAP, CAP_MMAP) \
74 MAPPING(CLOUDABI_RIGHT_MEM_MAP_EXEC, CAP_MMAP_X) \
75 MAPPING(CLOUDABI_RIGHT_POLL_FD_READWRITE, CAP_EVENT) \
76 MAPPING(CLOUDABI_RIGHT_POLL_MODIFY, CAP_KQUEUE_CHANGE) \
77 MAPPING(CLOUDABI_RIGHT_POLL_PROC_TERMINATE, CAP_EVENT) \
78 MAPPING(CLOUDABI_RIGHT_POLL_WAIT, CAP_KQUEUE_EVENT) \
79 MAPPING(CLOUDABI_RIGHT_PROC_EXEC, CAP_FEXECVE) \
80 MAPPING(CLOUDABI_RIGHT_SOCK_SHUTDOWN, CAP_SHUTDOWN) \
83 cloudabi_sys_fd_close(struct thread *td, struct cloudabi_sys_fd_close_args *uap)
86 return (kern_close(td, uap->fd));
90 cloudabi_sys_fd_create1(struct thread *td,
91 struct cloudabi_sys_fd_create1_args *uap)
93 struct filecaps fcaps = {};
96 case CLOUDABI_FILETYPE_POLL:
97 cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_KQUEUE);
98 return (kern_kqueue(td, 0, &fcaps));
99 case CLOUDABI_FILETYPE_SHARED_MEMORY:
100 cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_FTRUNCATE,
102 return (kern_shm_open(td, SHM_ANON, O_RDWR, 0, &fcaps));
109 cloudabi_sys_fd_create2(struct thread *td,
110 struct cloudabi_sys_fd_create2_args *uap)
116 case CLOUDABI_FILETYPE_SOCKET_DGRAM:
119 case CLOUDABI_FILETYPE_SOCKET_STREAM:
126 error = kern_socketpair(td, AF_UNIX, type, 0, fds);
128 td->td_retval[0] = fds[0];
129 td->td_retval[1] = fds[1];
135 cloudabi_sys_fd_datasync(struct thread *td,
136 struct cloudabi_sys_fd_datasync_args *uap)
139 return (kern_fsync(td, uap->fd, false));
143 cloudabi_sys_fd_dup(struct thread *td, struct cloudabi_sys_fd_dup_args *uap)
146 return (kern_dup(td, FDDUP_NORMAL, 0, uap->from, 0));
150 cloudabi_sys_fd_replace(struct thread *td,
151 struct cloudabi_sys_fd_replace_args *uap)
156 * CloudABI's equivalent to dup2(). CloudABI processes should
157 * not depend on hardcoded file descriptor layouts, but simply
158 * use the file descriptor numbers that are allocated by the
159 * kernel. Duplicating file descriptors to arbitrary numbers
160 * should not be done.
162 * Invoke kern_dup() with FDDUP_MUSTREPLACE, so that we return
163 * EBADF when duplicating to a nonexistent file descriptor. Also
164 * clear the return value, as this system call yields no return
167 error = kern_dup(td, FDDUP_MUSTREPLACE, 0, uap->from, uap->to);
168 td->td_retval[0] = 0;
173 cloudabi_sys_fd_seek(struct thread *td, struct cloudabi_sys_fd_seek_args *uap)
177 switch (uap->whence) {
178 case CLOUDABI_WHENCE_CUR:
181 case CLOUDABI_WHENCE_END:
184 case CLOUDABI_WHENCE_SET:
191 return (kern_lseek(td, uap->fd, uap->offset, whence));
194 /* Converts a file descriptor to a CloudABI file descriptor type. */
196 cloudabi_convert_filetype(const struct file *fp)
201 switch (fp->f_type) {
203 return (CLOUDABI_FILETYPE_SOCKET_STREAM);
205 return (CLOUDABI_FILETYPE_POLL);
207 return (CLOUDABI_FILETYPE_SOCKET_STREAM);
209 return (CLOUDABI_FILETYPE_PROCESS);
211 return (CLOUDABI_FILETYPE_SHARED_MEMORY);
214 switch (so->so_type) {
216 return (CLOUDABI_FILETYPE_SOCKET_DGRAM);
218 return (CLOUDABI_FILETYPE_SOCKET_STREAM);
220 return (CLOUDABI_FILETYPE_UNKNOWN);
224 switch (vp->v_type) {
226 return (CLOUDABI_FILETYPE_BLOCK_DEVICE);
228 return (CLOUDABI_FILETYPE_CHARACTER_DEVICE);
230 return (CLOUDABI_FILETYPE_DIRECTORY);
232 return (CLOUDABI_FILETYPE_SOCKET_STREAM);
234 return (CLOUDABI_FILETYPE_SYMBOLIC_LINK);
236 return (CLOUDABI_FILETYPE_REGULAR_FILE);
238 return (CLOUDABI_FILETYPE_SOCKET_STREAM);
240 return (CLOUDABI_FILETYPE_UNKNOWN);
243 return (CLOUDABI_FILETYPE_UNKNOWN);
247 /* Removes rights that conflict with the file descriptor type. */
249 cloudabi_remove_conflicting_rights(cloudabi_filetype_t filetype,
250 cloudabi_rights_t *base, cloudabi_rights_t *inheriting)
254 * CloudABI has a small number of additional rights bits to
255 * disambiguate between multiple purposes. Remove the bits that
256 * don't apply to the type of the file descriptor.
258 * As file descriptor access modes (O_ACCMODE) has been fully
259 * replaced by rights bits, CloudABI distinguishes between
260 * rights that apply to the file descriptor itself (base) versus
261 * rights of new file descriptors derived from them
262 * (inheriting). The code below approximates the pair by
263 * decomposing depending on the file descriptor type.
265 * We need to be somewhat accurate about which actions can
266 * actually be performed on the file descriptor, as functions
267 * like fcntl(fd, F_GETFL) are emulated on top of this.
270 case CLOUDABI_FILETYPE_DIRECTORY:
271 *base &= CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
272 CLOUDABI_RIGHT_FD_SYNC | CLOUDABI_RIGHT_FILE_ADVISE |
273 CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
274 CLOUDABI_RIGHT_FILE_CREATE_FILE |
275 CLOUDABI_RIGHT_FILE_LINK_SOURCE |
276 CLOUDABI_RIGHT_FILE_LINK_TARGET |
277 CLOUDABI_RIGHT_FILE_OPEN |
278 CLOUDABI_RIGHT_FILE_READDIR |
279 CLOUDABI_RIGHT_FILE_READLINK |
280 CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
281 CLOUDABI_RIGHT_FILE_RENAME_TARGET |
282 CLOUDABI_RIGHT_FILE_STAT_FGET |
283 CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
284 CLOUDABI_RIGHT_FILE_STAT_GET |
285 CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
286 CLOUDABI_RIGHT_FILE_SYMLINK |
287 CLOUDABI_RIGHT_FILE_UNLINK |
288 CLOUDABI_RIGHT_POLL_FD_READWRITE;
289 *inheriting &= CLOUDABI_RIGHT_FD_DATASYNC |
290 CLOUDABI_RIGHT_FD_READ |
291 CLOUDABI_RIGHT_FD_SEEK |
292 CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
293 CLOUDABI_RIGHT_FD_SYNC |
294 CLOUDABI_RIGHT_FD_TELL |
295 CLOUDABI_RIGHT_FD_WRITE |
296 CLOUDABI_RIGHT_FILE_ADVISE |
297 CLOUDABI_RIGHT_FILE_ALLOCATE |
298 CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
299 CLOUDABI_RIGHT_FILE_CREATE_FILE |
300 CLOUDABI_RIGHT_FILE_LINK_SOURCE |
301 CLOUDABI_RIGHT_FILE_LINK_TARGET |
302 CLOUDABI_RIGHT_FILE_OPEN |
303 CLOUDABI_RIGHT_FILE_READDIR |
304 CLOUDABI_RIGHT_FILE_READLINK |
305 CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
306 CLOUDABI_RIGHT_FILE_RENAME_TARGET |
307 CLOUDABI_RIGHT_FILE_STAT_FGET |
308 CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
309 CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
310 CLOUDABI_RIGHT_FILE_STAT_GET |
311 CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
312 CLOUDABI_RIGHT_FILE_SYMLINK |
313 CLOUDABI_RIGHT_FILE_UNLINK |
314 CLOUDABI_RIGHT_MEM_MAP |
315 CLOUDABI_RIGHT_MEM_MAP_EXEC |
316 CLOUDABI_RIGHT_POLL_FD_READWRITE |
317 CLOUDABI_RIGHT_PROC_EXEC;
319 case CLOUDABI_FILETYPE_POLL:
320 *base &= ~CLOUDABI_RIGHT_FILE_ADVISE;
323 case CLOUDABI_FILETYPE_PROCESS:
324 *base &= ~(CLOUDABI_RIGHT_FILE_ADVISE |
325 CLOUDABI_RIGHT_POLL_FD_READWRITE);
328 case CLOUDABI_FILETYPE_REGULAR_FILE:
329 *base &= CLOUDABI_RIGHT_FD_DATASYNC |
330 CLOUDABI_RIGHT_FD_READ |
331 CLOUDABI_RIGHT_FD_SEEK |
332 CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
333 CLOUDABI_RIGHT_FD_SYNC |
334 CLOUDABI_RIGHT_FD_TELL |
335 CLOUDABI_RIGHT_FD_WRITE |
336 CLOUDABI_RIGHT_FILE_ADVISE |
337 CLOUDABI_RIGHT_FILE_ALLOCATE |
338 CLOUDABI_RIGHT_FILE_STAT_FGET |
339 CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
340 CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
341 CLOUDABI_RIGHT_MEM_MAP |
342 CLOUDABI_RIGHT_MEM_MAP_EXEC |
343 CLOUDABI_RIGHT_POLL_FD_READWRITE |
344 CLOUDABI_RIGHT_PROC_EXEC;
347 case CLOUDABI_FILETYPE_SHARED_MEMORY:
348 *base &= ~(CLOUDABI_RIGHT_FD_SEEK |
349 CLOUDABI_RIGHT_FD_TELL |
350 CLOUDABI_RIGHT_FILE_ADVISE |
351 CLOUDABI_RIGHT_FILE_ALLOCATE |
352 CLOUDABI_RIGHT_FILE_READDIR);
355 case CLOUDABI_FILETYPE_SOCKET_DGRAM:
356 case CLOUDABI_FILETYPE_SOCKET_STREAM:
357 *base &= CLOUDABI_RIGHT_FD_READ |
358 CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
359 CLOUDABI_RIGHT_FD_WRITE |
360 CLOUDABI_RIGHT_FILE_STAT_FGET |
361 CLOUDABI_RIGHT_POLL_FD_READWRITE |
362 CLOUDABI_RIGHT_SOCK_SHUTDOWN;
370 /* Converts FreeBSD's Capsicum rights to CloudABI's set of rights. */
372 convert_capabilities(const cap_rights_t *capabilities,
373 cloudabi_filetype_t filetype, cloudabi_rights_t *base,
374 cloudabi_rights_t *inheriting)
376 cloudabi_rights_t rights;
378 /* Convert FreeBSD bits to CloudABI bits. */
380 #define MAPPING(cloudabi, ...) do { \
381 if (cap_rights_is_set(capabilities, ##__VA_ARGS__)) \
382 rights |= (cloudabi); \
388 *inheriting = rights;
389 cloudabi_remove_conflicting_rights(filetype, base, inheriting);
393 cloudabi_sys_fd_stat_get(struct thread *td,
394 struct cloudabi_sys_fd_stat_get_args *uap)
396 cloudabi_fdstat_t fsb = {};
399 struct filecaps fcaps;
402 /* Obtain file descriptor properties. */
403 error = fget_cap(td, uap->fd, cap_rights_init(&rights), &fp,
407 oflags = OFLAGS(fp->f_flag);
408 fsb.fs_filetype = cloudabi_convert_filetype(fp);
411 /* Convert file descriptor flags. */
412 if (oflags & O_APPEND)
413 fsb.fs_flags |= CLOUDABI_FDFLAG_APPEND;
414 if (oflags & O_NONBLOCK)
415 fsb.fs_flags |= CLOUDABI_FDFLAG_NONBLOCK;
417 fsb.fs_flags |= CLOUDABI_FDFLAG_SYNC;
419 /* Convert capabilities to CloudABI rights. */
420 convert_capabilities(&fcaps.fc_rights, fsb.fs_filetype,
421 &fsb.fs_rights_base, &fsb.fs_rights_inheriting);
422 filecaps_free(&fcaps);
423 return (copyout(&fsb, (void *)uap->buf, sizeof(fsb)));
426 /* Converts CloudABI rights to a set of Capsicum capabilities. */
428 cloudabi_convert_rights(cloudabi_rights_t in, cap_rights_t *out)
431 cap_rights_init(out);
432 #define MAPPING(cloudabi, ...) do { \
433 if (in & (cloudabi)) { \
434 cap_rights_set(out, ##__VA_ARGS__); \
441 return (ENOTCAPABLE);
446 cloudabi_sys_fd_stat_put(struct thread *td,
447 struct cloudabi_sys_fd_stat_put_args *uap)
449 cloudabi_fdstat_t fsb;
453 error = copyin(uap->buf, &fsb, sizeof(fsb));
457 if (uap->flags == CLOUDABI_FDSTAT_FLAGS) {
460 if (fsb.fs_flags & CLOUDABI_FDFLAG_APPEND)
462 if (fsb.fs_flags & CLOUDABI_FDFLAG_NONBLOCK)
463 oflags |= O_NONBLOCK;
464 if (fsb.fs_flags & (CLOUDABI_FDFLAG_SYNC |
465 CLOUDABI_FDFLAG_DSYNC | CLOUDABI_FDFLAG_RSYNC))
467 return (kern_fcntl(td, uap->fd, F_SETFL, oflags));
468 } else if (uap->flags == CLOUDABI_FDSTAT_RIGHTS) {
469 /* Convert rights. */
470 error = cloudabi_convert_rights(
471 fsb.fs_rights_base | fsb.fs_rights_inheriting, &rights);
474 return (kern_cap_rights_limit(td, uap->fd, &rights));
480 cloudabi_sys_fd_sync(struct thread *td, struct cloudabi_sys_fd_sync_args *uap)
483 return (kern_fsync(td, uap->fd, true));