Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/cloudabi/cloudabi_fd.c
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1 /*- 2 * Copyright (c) 2015 Nuxi, https://nuxi.nl/ 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 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. 12 * 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 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD: releng/11.2/sys/compat/cloudabi/cloudabi_fd.c 325858 2017-11-15 15:56:08Z ed $"); 28 29 #include <sys/param.h> 30 #include <sys/capsicum.h> 31 #include <sys/filedesc.h> 32 #include <sys/proc.h> 33 #include <sys/mman.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> 40 41 #include <contrib/cloudabi/cloudabi_types_common.h> 42 43 #include <compat/cloudabi/cloudabi_proto.h> 44 #include <compat/cloudabi/cloudabi_util.h> 45 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_PROC_TERMINATE, CAP_EVENT) \ 77 MAPPING(CLOUDABI_RIGHT_PROC_EXEC, CAP_FEXECVE) \ 78 MAPPING(CLOUDABI_RIGHT_SOCK_SHUTDOWN, CAP_SHUTDOWN) \ 79 80 int 81 cloudabi_sys_fd_close(struct thread *td, struct cloudabi_sys_fd_close_args *uap) 82 { 83 84 return (kern_close(td, uap->fd)); 85 } 86 87 int 88 cloudabi_sys_fd_create1(struct thread *td, 89 struct cloudabi_sys_fd_create1_args *uap) 90 { 91 struct filecaps fcaps = {}; 92 93 switch (uap->type) { 94 case CLOUDABI_FILETYPE_SHARED_MEMORY: 95 cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_FTRUNCATE, 96 CAP_MMAP_RWX); 97 return (kern_shm_open(td, SHM_ANON, O_RDWR, 0, &fcaps)); 98 default: 99 return (EINVAL); 100 } 101 } 102 103 int 104 cloudabi_sys_fd_create2(struct thread *td, 105 struct cloudabi_sys_fd_create2_args *uap) 106 { 107 int fds[2]; 108 int error, type; 109 110 switch (uap->type) { 111 case CLOUDABI_FILETYPE_SOCKET_DGRAM: 112 type = SOCK_DGRAM; 113 break; 114 case CLOUDABI_FILETYPE_SOCKET_STREAM: 115 type = SOCK_STREAM; 116 break; 117 default: 118 return (EINVAL); 119 } 120 121 error = kern_socketpair(td, AF_UNIX, type, 0, fds); 122 if (error == 0) { 123 td->td_retval[0] = fds[0]; 124 td->td_retval[1] = fds[1]; 125 } 126 return (0); 127 } 128 129 int 130 cloudabi_sys_fd_datasync(struct thread *td, 131 struct cloudabi_sys_fd_datasync_args *uap) 132 { 133 134 return (kern_fsync(td, uap->fd, false)); 135 } 136 137 int 138 cloudabi_sys_fd_dup(struct thread *td, struct cloudabi_sys_fd_dup_args *uap) 139 { 140 141 return (kern_dup(td, FDDUP_NORMAL, 0, uap->from, 0)); 142 } 143 144 int 145 cloudabi_sys_fd_replace(struct thread *td, 146 struct cloudabi_sys_fd_replace_args *uap) 147 { 148 int error; 149 150 /* 151 * CloudABI's equivalent to dup2(). CloudABI processes should 152 * not depend on hardcoded file descriptor layouts, but simply 153 * use the file descriptor numbers that are allocated by the 154 * kernel. Duplicating file descriptors to arbitrary numbers 155 * should not be done. 156 * 157 * Invoke kern_dup() with FDDUP_MUSTREPLACE, so that we return 158 * EBADF when duplicating to a nonexistent file descriptor. Also 159 * clear the return value, as this system call yields no return 160 * value. 161 */ 162 error = kern_dup(td, FDDUP_MUSTREPLACE, 0, uap->from, uap->to); 163 td->td_retval[0] = 0; 164 return (error); 165 } 166 167 int 168 cloudabi_sys_fd_seek(struct thread *td, struct cloudabi_sys_fd_seek_args *uap) 169 { 170 int whence; 171 172 switch (uap->whence) { 173 case CLOUDABI_WHENCE_CUR: 174 whence = SEEK_CUR; 175 break; 176 case CLOUDABI_WHENCE_END: 177 whence = SEEK_END; 178 break; 179 case CLOUDABI_WHENCE_SET: 180 whence = SEEK_SET; 181 break; 182 default: 183 return (EINVAL); 184 } 185 186 return (kern_lseek(td, uap->fd, uap->offset, whence)); 187 } 188 189 /* Converts a file descriptor to a CloudABI file descriptor type. */ 190 cloudabi_filetype_t 191 cloudabi_convert_filetype(const struct file *fp) 192 { 193 struct socket *so; 194 struct vnode *vp; 195 196 switch (fp->f_type) { 197 case DTYPE_FIFO: 198 return (CLOUDABI_FILETYPE_SOCKET_STREAM); 199 case DTYPE_PIPE: 200 return (CLOUDABI_FILETYPE_SOCKET_STREAM); 201 case DTYPE_PROCDESC: 202 return (CLOUDABI_FILETYPE_PROCESS); 203 case DTYPE_SHM: 204 return (CLOUDABI_FILETYPE_SHARED_MEMORY); 205 case DTYPE_SOCKET: 206 so = fp->f_data; 207 switch (so->so_type) { 208 case SOCK_DGRAM: 209 return (CLOUDABI_FILETYPE_SOCKET_DGRAM); 210 case SOCK_STREAM: 211 return (CLOUDABI_FILETYPE_SOCKET_STREAM); 212 default: 213 return (CLOUDABI_FILETYPE_UNKNOWN); 214 } 215 case DTYPE_VNODE: 216 vp = fp->f_vnode; 217 switch (vp->v_type) { 218 case VBLK: 219 return (CLOUDABI_FILETYPE_BLOCK_DEVICE); 220 case VCHR: 221 return (CLOUDABI_FILETYPE_CHARACTER_DEVICE); 222 case VDIR: 223 return (CLOUDABI_FILETYPE_DIRECTORY); 224 case VFIFO: 225 return (CLOUDABI_FILETYPE_SOCKET_STREAM); 226 case VLNK: 227 return (CLOUDABI_FILETYPE_SYMBOLIC_LINK); 228 case VREG: 229 return (CLOUDABI_FILETYPE_REGULAR_FILE); 230 case VSOCK: 231 return (CLOUDABI_FILETYPE_SOCKET_STREAM); 232 default: 233 return (CLOUDABI_FILETYPE_UNKNOWN); 234 } 235 default: 236 return (CLOUDABI_FILETYPE_UNKNOWN); 237 } 238 } 239 240 /* Removes rights that conflict with the file descriptor type. */ 241 void 242 cloudabi_remove_conflicting_rights(cloudabi_filetype_t filetype, 243 cloudabi_rights_t *base, cloudabi_rights_t *inheriting) 244 { 245 246 /* 247 * CloudABI has a small number of additional rights bits to 248 * disambiguate between multiple purposes. Remove the bits that 249 * don't apply to the type of the file descriptor. 250 * 251 * As file descriptor access modes (O_ACCMODE) has been fully 252 * replaced by rights bits, CloudABI distinguishes between 253 * rights that apply to the file descriptor itself (base) versus 254 * rights of new file descriptors derived from them 255 * (inheriting). The code below approximates the pair by 256 * decomposing depending on the file descriptor type. 257 * 258 * We need to be somewhat accurate about which actions can 259 * actually be performed on the file descriptor, as functions 260 * like fcntl(fd, F_GETFL) are emulated on top of this. 261 */ 262 switch (filetype) { 263 case CLOUDABI_FILETYPE_DIRECTORY: 264 *base &= CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS | 265 CLOUDABI_RIGHT_FD_SYNC | CLOUDABI_RIGHT_FILE_ADVISE | 266 CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY | 267 CLOUDABI_RIGHT_FILE_CREATE_FILE | 268 CLOUDABI_RIGHT_FILE_LINK_SOURCE | 269 CLOUDABI_RIGHT_FILE_LINK_TARGET | 270 CLOUDABI_RIGHT_FILE_OPEN | 271 CLOUDABI_RIGHT_FILE_READDIR | 272 CLOUDABI_RIGHT_FILE_READLINK | 273 CLOUDABI_RIGHT_FILE_RENAME_SOURCE | 274 CLOUDABI_RIGHT_FILE_RENAME_TARGET | 275 CLOUDABI_RIGHT_FILE_STAT_FGET | 276 CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES | 277 CLOUDABI_RIGHT_FILE_STAT_GET | 278 CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES | 279 CLOUDABI_RIGHT_FILE_SYMLINK | 280 CLOUDABI_RIGHT_FILE_UNLINK | 281 CLOUDABI_RIGHT_POLL_FD_READWRITE; 282 *inheriting &= CLOUDABI_RIGHT_FD_DATASYNC | 283 CLOUDABI_RIGHT_FD_READ | 284 CLOUDABI_RIGHT_FD_SEEK | 285 CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS | 286 CLOUDABI_RIGHT_FD_SYNC | 287 CLOUDABI_RIGHT_FD_TELL | 288 CLOUDABI_RIGHT_FD_WRITE | 289 CLOUDABI_RIGHT_FILE_ADVISE | 290 CLOUDABI_RIGHT_FILE_ALLOCATE | 291 CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY | 292 CLOUDABI_RIGHT_FILE_CREATE_FILE | 293 CLOUDABI_RIGHT_FILE_LINK_SOURCE | 294 CLOUDABI_RIGHT_FILE_LINK_TARGET | 295 CLOUDABI_RIGHT_FILE_OPEN | 296 CLOUDABI_RIGHT_FILE_READDIR | 297 CLOUDABI_RIGHT_FILE_READLINK | 298 CLOUDABI_RIGHT_FILE_RENAME_SOURCE | 299 CLOUDABI_RIGHT_FILE_RENAME_TARGET | 300 CLOUDABI_RIGHT_FILE_STAT_FGET | 301 CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE | 302 CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES | 303 CLOUDABI_RIGHT_FILE_STAT_GET | 304 CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES | 305 CLOUDABI_RIGHT_FILE_SYMLINK | 306 CLOUDABI_RIGHT_FILE_UNLINK | 307 CLOUDABI_RIGHT_MEM_MAP | 308 CLOUDABI_RIGHT_MEM_MAP_EXEC | 309 CLOUDABI_RIGHT_POLL_FD_READWRITE | 310 CLOUDABI_RIGHT_PROC_EXEC; 311 break; 312 case CLOUDABI_FILETYPE_PROCESS: 313 *base &= ~(CLOUDABI_RIGHT_FILE_ADVISE | 314 CLOUDABI_RIGHT_POLL_FD_READWRITE); 315 *inheriting = 0; 316 break; 317 case CLOUDABI_FILETYPE_REGULAR_FILE: 318 *base &= CLOUDABI_RIGHT_FD_DATASYNC | 319 CLOUDABI_RIGHT_FD_READ | 320 CLOUDABI_RIGHT_FD_SEEK | 321 CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS | 322 CLOUDABI_RIGHT_FD_SYNC | 323 CLOUDABI_RIGHT_FD_TELL | 324 CLOUDABI_RIGHT_FD_WRITE | 325 CLOUDABI_RIGHT_FILE_ADVISE | 326 CLOUDABI_RIGHT_FILE_ALLOCATE | 327 CLOUDABI_RIGHT_FILE_STAT_FGET | 328 CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE | 329 CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES | 330 CLOUDABI_RIGHT_MEM_MAP | 331 CLOUDABI_RIGHT_MEM_MAP_EXEC | 332 CLOUDABI_RIGHT_POLL_FD_READWRITE | 333 CLOUDABI_RIGHT_PROC_EXEC; 334 *inheriting = 0; 335 break; 336 case CLOUDABI_FILETYPE_SHARED_MEMORY: 337 *base &= ~(CLOUDABI_RIGHT_FD_SEEK | 338 CLOUDABI_RIGHT_FD_TELL | 339 CLOUDABI_RIGHT_FILE_ADVISE | 340 CLOUDABI_RIGHT_FILE_ALLOCATE | 341 CLOUDABI_RIGHT_FILE_READDIR); 342 *inheriting = 0; 343 break; 344 case CLOUDABI_FILETYPE_SOCKET_DGRAM: 345 case CLOUDABI_FILETYPE_SOCKET_STREAM: 346 *base &= CLOUDABI_RIGHT_FD_READ | 347 CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS | 348 CLOUDABI_RIGHT_FD_WRITE | 349 CLOUDABI_RIGHT_FILE_STAT_FGET | 350 CLOUDABI_RIGHT_POLL_FD_READWRITE | 351 CLOUDABI_RIGHT_SOCK_SHUTDOWN; 352 break; 353 default: 354 *inheriting = 0; 355 break; 356 } 357 } 358 359 /* Converts FreeBSD's Capsicum rights to CloudABI's set of rights. */ 360 static void 361 convert_capabilities(const cap_rights_t *capabilities, 362 cloudabi_filetype_t filetype, cloudabi_rights_t *base, 363 cloudabi_rights_t *inheriting) 364 { 365 cloudabi_rights_t rights; 366 367 /* Convert FreeBSD bits to CloudABI bits. */ 368 rights = 0; 369 #define MAPPING(cloudabi, ...) do { \ 370 if (cap_rights_is_set(capabilities, ##__VA_ARGS__)) \ 371 rights |= (cloudabi); \ 372 } while (0); 373 RIGHTS_MAPPINGS 374 #undef MAPPING 375 376 *base = rights; 377 *inheriting = rights; 378 cloudabi_remove_conflicting_rights(filetype, base, inheriting); 379 } 380 381 int 382 cloudabi_sys_fd_stat_get(struct thread *td, 383 struct cloudabi_sys_fd_stat_get_args *uap) 384 { 385 cloudabi_fdstat_t fsb = {}; 386 struct filedesc *fdp; 387 struct file *fp; 388 seq_t seq; 389 cap_rights_t rights; 390 int error, oflags; 391 bool modified; 392 393 /* Obtain file descriptor properties. */ 394 fdp = td->td_proc->p_fd; 395 do { 396 error = fget_unlocked(fdp, uap->fd, cap_rights_init(&rights), 397 &fp, &seq); 398 if (error != 0) 399 return (error); 400 if (fp->f_ops == &badfileops) { 401 fdrop(fp, td); 402 return (EBADF); 403 } 404 405 rights = *cap_rights(fdp, uap->fd); 406 oflags = OFLAGS(fp->f_flag); 407 fsb.fs_filetype = cloudabi_convert_filetype(fp); 408 409 modified = fd_modified(fdp, uap->fd, seq); 410 fdrop(fp, td); 411 } while (modified); 412 413 /* Convert file descriptor flags. */ 414 if (oflags & O_APPEND) 415 fsb.fs_flags |= CLOUDABI_FDFLAG_APPEND; 416 if (oflags & O_NONBLOCK) 417 fsb.fs_flags |= CLOUDABI_FDFLAG_NONBLOCK; 418 if (oflags & O_SYNC) 419 fsb.fs_flags |= CLOUDABI_FDFLAG_SYNC; 420 421 /* Convert capabilities to CloudABI rights. */ 422 convert_capabilities(&rights, fsb.fs_filetype, 423 &fsb.fs_rights_base, &fsb.fs_rights_inheriting); 424 return (copyout(&fsb, (void *)uap->buf, sizeof(fsb))); 425 } 426 427 /* Converts CloudABI rights to a set of Capsicum capabilities. */ 428 int 429 cloudabi_convert_rights(cloudabi_rights_t in, cap_rights_t *out) 430 { 431 432 cap_rights_init(out); 433 #define MAPPING(cloudabi, ...) do { \ 434 if (in & (cloudabi)) { \ 435 cap_rights_set(out, ##__VA_ARGS__); \ 436 in &= ~(cloudabi); \ 437 } \ 438 } while (0); 439 RIGHTS_MAPPINGS 440 #undef MAPPING 441 if (in != 0) 442 return (ENOTCAPABLE); 443 return (0); 444 } 445 446 int 447 cloudabi_sys_fd_stat_put(struct thread *td, 448 struct cloudabi_sys_fd_stat_put_args *uap) 449 { 450 cloudabi_fdstat_t fsb; 451 cap_rights_t rights; 452 int error, oflags; 453 454 error = copyin(uap->buf, &fsb, sizeof(fsb)); 455 if (error != 0) 456 return (error); 457 458 if (uap->flags == CLOUDABI_FDSTAT_FLAGS) { 459 /* Convert flags. */ 460 oflags = 0; 461 if (fsb.fs_flags & CLOUDABI_FDFLAG_APPEND) 462 oflags |= O_APPEND; 463 if (fsb.fs_flags & CLOUDABI_FDFLAG_NONBLOCK) 464 oflags |= O_NONBLOCK; 465 if (fsb.fs_flags & (CLOUDABI_FDFLAG_SYNC | 466 CLOUDABI_FDFLAG_DSYNC | CLOUDABI_FDFLAG_RSYNC)) 467 oflags |= O_SYNC; 468 return (kern_fcntl(td, uap->fd, F_SETFL, oflags)); 469 } else if (uap->flags == CLOUDABI_FDSTAT_RIGHTS) { 470 /* Convert rights. */ 471 error = cloudabi_convert_rights( 472 fsb.fs_rights_base | fsb.fs_rights_inheriting, &rights); 473 if (error != 0) 474 return (error); 475 return (kern_cap_rights_limit(td, uap->fd, &rights)); 476 } 477 return (EINVAL); 478 } 479 480 int 481 cloudabi_sys_fd_sync(struct thread *td, struct cloudabi_sys_fd_sync_args *uap) 482 { 483 484 return (kern_fsync(td, uap->fd, true)); 485 }
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