1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1994-1995 Søren Schmidt 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/capsicum.h> 37 #include <sys/conf.h> 38 #include <sys/dirent.h> 39 #include <sys/fcntl.h> 40 #include <sys/file.h> 41 #include <sys/filedesc.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mman.h> 45 #include <sys/mount.h> 46 #include <sys/mutex.h> 47 #include <sys/namei.h> 48 #include <sys/selinfo.h> 49 #include <sys/pipe.h> 50 #include <sys/proc.h> 51 #include <sys/stat.h> 52 #include <sys/sx.h> 53 #include <sys/syscallsubr.h> 54 #include <sys/sysproto.h> 55 #include <sys/tty.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 59 #ifdef COMPAT_LINUX32 60 #include <compat/freebsd32/freebsd32_misc.h> 61 #include <machine/../linux32/linux.h> 62 #include <machine/../linux32/linux32_proto.h> 63 #else 64 #include <machine/../linux/linux.h> 65 #include <machine/../linux/linux_proto.h> 66 #endif 67 #include <compat/linux/linux_misc.h> 68 #include <compat/linux/linux_util.h> 69 #include <compat/linux/linux_file.h> 70 71 static int linux_common_open(struct thread *, int, const char *, int, int, 72 enum uio_seg); 73 static int linux_do_accessat(struct thread *t, int, const char *, int, int); 74 static int linux_getdents_error(struct thread *, int, int); 75 76 static struct bsd_to_linux_bitmap seal_bitmap[] = { 77 BITMAP_1t1_LINUX(F_SEAL_SEAL), 78 BITMAP_1t1_LINUX(F_SEAL_SHRINK), 79 BITMAP_1t1_LINUX(F_SEAL_GROW), 80 BITMAP_1t1_LINUX(F_SEAL_WRITE), 81 }; 82 83 #define MFD_HUGETLB_ENTRY(_size) \ 84 { \ 85 .bsd_value = MFD_HUGE_##_size, \ 86 .linux_value = LINUX_HUGETLB_FLAG_ENCODE_##_size \ 87 } 88 static struct bsd_to_linux_bitmap mfd_bitmap[] = { 89 BITMAP_1t1_LINUX(MFD_CLOEXEC), 90 BITMAP_1t1_LINUX(MFD_ALLOW_SEALING), 91 BITMAP_1t1_LINUX(MFD_HUGETLB), 92 MFD_HUGETLB_ENTRY(64KB), 93 MFD_HUGETLB_ENTRY(512KB), 94 MFD_HUGETLB_ENTRY(1MB), 95 MFD_HUGETLB_ENTRY(2MB), 96 MFD_HUGETLB_ENTRY(8MB), 97 MFD_HUGETLB_ENTRY(16MB), 98 MFD_HUGETLB_ENTRY(32MB), 99 MFD_HUGETLB_ENTRY(256MB), 100 MFD_HUGETLB_ENTRY(512MB), 101 MFD_HUGETLB_ENTRY(1GB), 102 MFD_HUGETLB_ENTRY(2GB), 103 MFD_HUGETLB_ENTRY(16GB), 104 }; 105 #undef MFD_HUGETLB_ENTRY 106 107 #ifdef LINUX_LEGACY_SYSCALLS 108 int 109 linux_creat(struct thread *td, struct linux_creat_args *args) 110 { 111 char *path; 112 int error; 113 114 if (!LUSECONVPATH(td)) { 115 return (kern_openat(td, AT_FDCWD, args->path, UIO_USERSPACE, 116 O_WRONLY | O_CREAT | O_TRUNC, args->mode)); 117 } 118 LCONVPATHEXIST(args->path, &path); 119 error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE, 120 O_WRONLY | O_CREAT | O_TRUNC, args->mode); 121 LFREEPATH(path); 122 return (error); 123 } 124 #endif 125 126 static int 127 linux_common_openflags(int l_flags) 128 { 129 int bsd_flags; 130 131 bsd_flags = 0; 132 switch (l_flags & LINUX_O_ACCMODE) { 133 case LINUX_O_WRONLY: 134 bsd_flags |= O_WRONLY; 135 break; 136 case LINUX_O_RDWR: 137 bsd_flags |= O_RDWR; 138 break; 139 default: 140 bsd_flags |= O_RDONLY; 141 } 142 if (l_flags & LINUX_O_NDELAY) 143 bsd_flags |= O_NONBLOCK; 144 if (l_flags & LINUX_O_APPEND) 145 bsd_flags |= O_APPEND; 146 if (l_flags & LINUX_O_SYNC) 147 bsd_flags |= O_FSYNC; 148 if (l_flags & LINUX_O_CLOEXEC) 149 bsd_flags |= O_CLOEXEC; 150 if (l_flags & LINUX_O_NONBLOCK) 151 bsd_flags |= O_NONBLOCK; 152 if (l_flags & LINUX_O_ASYNC) 153 bsd_flags |= O_ASYNC; 154 if (l_flags & LINUX_O_CREAT) 155 bsd_flags |= O_CREAT; 156 if (l_flags & LINUX_O_TRUNC) 157 bsd_flags |= O_TRUNC; 158 if (l_flags & LINUX_O_EXCL) 159 bsd_flags |= O_EXCL; 160 if (l_flags & LINUX_O_NOCTTY) 161 bsd_flags |= O_NOCTTY; 162 if (l_flags & LINUX_O_DIRECT) 163 bsd_flags |= O_DIRECT; 164 if (l_flags & LINUX_O_NOFOLLOW) 165 bsd_flags |= O_NOFOLLOW; 166 if (l_flags & LINUX_O_DIRECTORY) 167 bsd_flags |= O_DIRECTORY; 168 if (l_flags & LINUX_O_PATH) 169 bsd_flags |= O_PATH; 170 /* XXX LINUX_O_NOATIME: unable to be easily implemented. */ 171 return (bsd_flags); 172 } 173 174 static int 175 linux_common_open(struct thread *td, int dirfd, const char *path, int l_flags, 176 int mode, enum uio_seg seg) 177 { 178 struct proc *p = td->td_proc; 179 struct file *fp; 180 int fd; 181 int bsd_flags, error; 182 183 bsd_flags = linux_common_openflags(l_flags); 184 error = kern_openat(td, dirfd, path, seg, bsd_flags, mode); 185 if (error != 0) { 186 if (error == EMLINK) 187 error = ELOOP; 188 goto done; 189 } 190 if (p->p_flag & P_CONTROLT) 191 goto done; 192 if (bsd_flags & O_NOCTTY) 193 goto done; 194 195 /* 196 * XXX In between kern_openat() and fget(), another process 197 * having the same filedesc could use that fd without 198 * checking below. 199 */ 200 fd = td->td_retval[0]; 201 if (fget(td, fd, &cap_ioctl_rights, &fp) == 0) { 202 if (fp->f_type != DTYPE_VNODE) { 203 fdrop(fp, td); 204 goto done; 205 } 206 sx_slock(&proctree_lock); 207 PROC_LOCK(p); 208 if (SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) { 209 PROC_UNLOCK(p); 210 sx_sunlock(&proctree_lock); 211 /* XXXPJD: Verify if TIOCSCTTY is allowed. */ 212 (void) fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, 213 td->td_ucred, td); 214 } else { 215 PROC_UNLOCK(p); 216 sx_sunlock(&proctree_lock); 217 } 218 fdrop(fp, td); 219 } 220 221 done: 222 return (error); 223 } 224 225 int 226 linux_openat(struct thread *td, struct linux_openat_args *args) 227 { 228 char *path; 229 int dfd, error; 230 231 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 232 if (!LUSECONVPATH(td)) { 233 return (linux_common_open(td, dfd, args->filename, args->flags, 234 args->mode, UIO_USERSPACE)); 235 } 236 if (args->flags & LINUX_O_CREAT) 237 LCONVPATH_AT(args->filename, &path, 1, dfd); 238 else 239 LCONVPATH_AT(args->filename, &path, 0, dfd); 240 241 error = linux_common_open(td, dfd, path, args->flags, args->mode, 242 UIO_SYSSPACE); 243 LFREEPATH(path); 244 return (error); 245 } 246 247 #ifdef LINUX_LEGACY_SYSCALLS 248 int 249 linux_open(struct thread *td, struct linux_open_args *args) 250 { 251 char *path; 252 int error; 253 254 if (!LUSECONVPATH(td)) { 255 return (linux_common_open(td, AT_FDCWD, args->path, args->flags, 256 args->mode, UIO_USERSPACE)); 257 } 258 if (args->flags & LINUX_O_CREAT) 259 LCONVPATHCREAT(args->path, &path); 260 else 261 LCONVPATHEXIST(args->path, &path); 262 263 error = linux_common_open(td, AT_FDCWD, path, args->flags, args->mode, 264 UIO_SYSSPACE); 265 LFREEPATH(path); 266 return (error); 267 } 268 #endif 269 270 int 271 linux_name_to_handle_at(struct thread *td, 272 struct linux_name_to_handle_at_args *args) 273 { 274 static const l_int valid_flags = (LINUX_AT_SYMLINK_FOLLOW | 275 LINUX_AT_EMPTY_PATH); 276 static const l_uint fh_size = sizeof(fhandle_t); 277 278 fhandle_t fh; 279 l_uint fh_bytes; 280 l_int mount_id; 281 int error, fd, bsd_flags; 282 283 if (args->flags & ~valid_flags) 284 return (EINVAL); 285 286 fd = args->dirfd; 287 if (fd == LINUX_AT_FDCWD) 288 fd = AT_FDCWD; 289 290 bsd_flags = 0; 291 if (!(args->flags & LINUX_AT_SYMLINK_FOLLOW)) 292 bsd_flags |= AT_SYMLINK_NOFOLLOW; 293 if ((args->flags & LINUX_AT_EMPTY_PATH) != 0) 294 bsd_flags |= AT_EMPTY_PATH; 295 296 if (!LUSECONVPATH(td)) { 297 error = kern_getfhat(td, bsd_flags, fd, args->name, 298 UIO_USERSPACE, &fh, UIO_SYSSPACE); 299 } else { 300 char *path; 301 302 LCONVPATH_AT(args->name, &path, 0, fd); 303 error = kern_getfhat(td, bsd_flags, fd, path, UIO_SYSSPACE, 304 &fh, UIO_SYSSPACE); 305 LFREEPATH(path); 306 } 307 if (error != 0) 308 return (error); 309 310 /* Emit mount_id -- required before EOVERFLOW case. */ 311 mount_id = (fh.fh_fsid.val[0] ^ fh.fh_fsid.val[1]); 312 error = copyout(&mount_id, args->mnt_id, sizeof(mount_id)); 313 if (error != 0) 314 return (error); 315 316 /* Check if there is room for handle. */ 317 error = copyin(&args->handle->handle_bytes, &fh_bytes, 318 sizeof(fh_bytes)); 319 if (error != 0) 320 return (error); 321 322 if (fh_bytes < fh_size) { 323 error = copyout(&fh_size, &args->handle->handle_bytes, 324 sizeof(fh_size)); 325 if (error == 0) 326 error = EOVERFLOW; 327 return (error); 328 } 329 330 /* Emit handle. */ 331 mount_id = 0; 332 /* 333 * We don't use handle_type for anything yet, but initialize a known 334 * value. 335 */ 336 error = copyout(&mount_id, &args->handle->handle_type, 337 sizeof(mount_id)); 338 if (error != 0) 339 return (error); 340 341 error = copyout(&fh, &args->handle->f_handle, 342 sizeof(fh)); 343 return (error); 344 } 345 346 int 347 linux_open_by_handle_at(struct thread *td, 348 struct linux_open_by_handle_at_args *args) 349 { 350 l_uint fh_bytes; 351 int bsd_flags, error; 352 353 error = copyin(&args->handle->handle_bytes, &fh_bytes, 354 sizeof(fh_bytes)); 355 if (error != 0) 356 return (error); 357 358 if (fh_bytes < sizeof(fhandle_t)) 359 return (EINVAL); 360 361 bsd_flags = linux_common_openflags(args->flags); 362 return (kern_fhopen(td, (void *)&args->handle->f_handle, bsd_flags)); 363 } 364 365 int 366 linux_lseek(struct thread *td, struct linux_lseek_args *args) 367 { 368 369 return (kern_lseek(td, args->fdes, args->off, args->whence)); 370 } 371 372 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 373 int 374 linux_llseek(struct thread *td, struct linux_llseek_args *args) 375 { 376 int error; 377 off_t off; 378 379 off = (args->olow) | (((off_t) args->ohigh) << 32); 380 381 error = kern_lseek(td, args->fd, off, args->whence); 382 if (error != 0) 383 return (error); 384 385 error = copyout(td->td_retval, args->res, sizeof(off_t)); 386 if (error != 0) 387 return (error); 388 389 td->td_retval[0] = 0; 390 return (0); 391 } 392 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 393 394 /* 395 * Note that linux_getdents(2) and linux_getdents64(2) have the same 396 * arguments. They only differ in the definition of struct dirent they 397 * operate on. 398 * Note that linux_readdir(2) is a special case of linux_getdents(2) 399 * where count is always equals 1, meaning that the buffer is one 400 * dirent-structure in size and that the code can't handle more anyway. 401 * Note that linux_readdir(2) can't be implemented by means of linux_getdents(2) 402 * as in case when the *dent buffer size is equal to 1 linux_getdents(2) will 403 * trash user stack. 404 */ 405 406 static int 407 linux_getdents_error(struct thread *td, int fd, int err) 408 { 409 struct vnode *vp; 410 struct file *fp; 411 int error; 412 413 /* Linux return ENOTDIR in case when fd is not a directory. */ 414 error = getvnode(td, fd, &cap_read_rights, &fp); 415 if (error != 0) 416 return (error); 417 vp = fp->f_vnode; 418 if (vp->v_type != VDIR) { 419 fdrop(fp, td); 420 return (ENOTDIR); 421 } 422 fdrop(fp, td); 423 return (err); 424 } 425 426 struct l_dirent { 427 l_ulong d_ino; 428 l_off_t d_off; 429 l_ushort d_reclen; 430 char d_name[LINUX_NAME_MAX + 1]; 431 }; 432 433 struct l_dirent64 { 434 uint64_t d_ino; 435 int64_t d_off; 436 l_ushort d_reclen; 437 u_char d_type; 438 char d_name[LINUX_NAME_MAX + 1]; 439 }; 440 441 /* 442 * Linux uses the last byte in the dirent buffer to store d_type, 443 * at least glibc-2.7 requires it. That is why l_dirent is padded with 2 bytes. 444 */ 445 #define LINUX_RECLEN(namlen) \ 446 roundup(offsetof(struct l_dirent, d_name) + (namlen) + 2, sizeof(l_ulong)) 447 448 #define LINUX_RECLEN64(namlen) \ 449 roundup(offsetof(struct l_dirent64, d_name) + (namlen) + 1, \ 450 sizeof(uint64_t)) 451 452 #ifdef LINUX_LEGACY_SYSCALLS 453 int 454 linux_getdents(struct thread *td, struct linux_getdents_args *args) 455 { 456 struct dirent *bdp; 457 caddr_t inp, buf; /* BSD-format */ 458 int len, reclen; /* BSD-format */ 459 caddr_t outp; /* Linux-format */ 460 int resid, linuxreclen; /* Linux-format */ 461 caddr_t lbuf; /* Linux-format */ 462 off_t base; 463 struct l_dirent *linux_dirent; 464 int buflen, error; 465 size_t retval; 466 467 buflen = min(args->count, MAXBSIZE); 468 buf = malloc(buflen, M_TEMP, M_WAITOK); 469 470 error = kern_getdirentries(td, args->fd, buf, buflen, 471 &base, NULL, UIO_SYSSPACE); 472 if (error != 0) { 473 error = linux_getdents_error(td, args->fd, error); 474 goto out1; 475 } 476 477 lbuf = malloc(LINUX_RECLEN(LINUX_NAME_MAX), M_TEMP, M_WAITOK | M_ZERO); 478 479 len = td->td_retval[0]; 480 inp = buf; 481 outp = (caddr_t)args->dent; 482 resid = args->count; 483 retval = 0; 484 485 while (len > 0) { 486 bdp = (struct dirent *) inp; 487 reclen = bdp->d_reclen; 488 linuxreclen = LINUX_RECLEN(bdp->d_namlen); 489 /* 490 * No more space in the user supplied dirent buffer. 491 * Return EINVAL. 492 */ 493 if (resid < linuxreclen) { 494 error = EINVAL; 495 goto out; 496 } 497 498 linux_dirent = (struct l_dirent*)lbuf; 499 linux_dirent->d_ino = bdp->d_fileno; 500 linux_dirent->d_off = base + reclen; 501 linux_dirent->d_reclen = linuxreclen; 502 /* 503 * Copy d_type to last byte of l_dirent buffer 504 */ 505 lbuf[linuxreclen - 1] = bdp->d_type; 506 strlcpy(linux_dirent->d_name, bdp->d_name, 507 linuxreclen - offsetof(struct l_dirent, d_name)-1); 508 error = copyout(linux_dirent, outp, linuxreclen); 509 if (error != 0) 510 goto out; 511 512 inp += reclen; 513 base += reclen; 514 len -= reclen; 515 516 retval += linuxreclen; 517 outp += linuxreclen; 518 resid -= linuxreclen; 519 } 520 td->td_retval[0] = retval; 521 522 out: 523 free(lbuf, M_TEMP); 524 out1: 525 free(buf, M_TEMP); 526 return (error); 527 } 528 #endif 529 530 int 531 linux_getdents64(struct thread *td, struct linux_getdents64_args *args) 532 { 533 struct dirent *bdp; 534 caddr_t inp, buf; /* BSD-format */ 535 int len, reclen; /* BSD-format */ 536 caddr_t outp; /* Linux-format */ 537 int resid, linuxreclen; /* Linux-format */ 538 caddr_t lbuf; /* Linux-format */ 539 off_t base; 540 struct l_dirent64 *linux_dirent64; 541 int buflen, error; 542 size_t retval; 543 544 buflen = min(args->count, MAXBSIZE); 545 buf = malloc(buflen, M_TEMP, M_WAITOK); 546 547 error = kern_getdirentries(td, args->fd, buf, buflen, 548 &base, NULL, UIO_SYSSPACE); 549 if (error != 0) { 550 error = linux_getdents_error(td, args->fd, error); 551 goto out1; 552 } 553 554 lbuf = malloc(LINUX_RECLEN64(LINUX_NAME_MAX), M_TEMP, M_WAITOK | M_ZERO); 555 556 len = td->td_retval[0]; 557 inp = buf; 558 outp = (caddr_t)args->dirent; 559 resid = args->count; 560 retval = 0; 561 562 while (len > 0) { 563 bdp = (struct dirent *) inp; 564 reclen = bdp->d_reclen; 565 linuxreclen = LINUX_RECLEN64(bdp->d_namlen); 566 /* 567 * No more space in the user supplied dirent buffer. 568 * Return EINVAL. 569 */ 570 if (resid < linuxreclen) { 571 error = EINVAL; 572 goto out; 573 } 574 575 linux_dirent64 = (struct l_dirent64*)lbuf; 576 linux_dirent64->d_ino = bdp->d_fileno; 577 linux_dirent64->d_off = base + reclen; 578 linux_dirent64->d_reclen = linuxreclen; 579 linux_dirent64->d_type = bdp->d_type; 580 strlcpy(linux_dirent64->d_name, bdp->d_name, 581 linuxreclen - offsetof(struct l_dirent64, d_name)); 582 error = copyout(linux_dirent64, outp, linuxreclen); 583 if (error != 0) 584 goto out; 585 586 inp += reclen; 587 base += reclen; 588 len -= reclen; 589 590 retval += linuxreclen; 591 outp += linuxreclen; 592 resid -= linuxreclen; 593 } 594 td->td_retval[0] = retval; 595 596 out: 597 free(lbuf, M_TEMP); 598 out1: 599 free(buf, M_TEMP); 600 return (error); 601 } 602 603 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 604 int 605 linux_readdir(struct thread *td, struct linux_readdir_args *args) 606 { 607 struct dirent *bdp; 608 caddr_t buf; /* BSD-format */ 609 int linuxreclen; /* Linux-format */ 610 caddr_t lbuf; /* Linux-format */ 611 off_t base; 612 struct l_dirent *linux_dirent; 613 int buflen, error; 614 615 buflen = LINUX_RECLEN(LINUX_NAME_MAX); 616 buf = malloc(buflen, M_TEMP, M_WAITOK); 617 618 error = kern_getdirentries(td, args->fd, buf, buflen, 619 &base, NULL, UIO_SYSSPACE); 620 if (error != 0) { 621 error = linux_getdents_error(td, args->fd, error); 622 goto out; 623 } 624 if (td->td_retval[0] == 0) 625 goto out; 626 627 lbuf = malloc(LINUX_RECLEN(LINUX_NAME_MAX), M_TEMP, M_WAITOK | M_ZERO); 628 629 bdp = (struct dirent *) buf; 630 linuxreclen = LINUX_RECLEN(bdp->d_namlen); 631 632 linux_dirent = (struct l_dirent*)lbuf; 633 linux_dirent->d_ino = bdp->d_fileno; 634 linux_dirent->d_off = linuxreclen; 635 linux_dirent->d_reclen = bdp->d_namlen; 636 strlcpy(linux_dirent->d_name, bdp->d_name, 637 linuxreclen - offsetof(struct l_dirent, d_name)); 638 error = copyout(linux_dirent, args->dent, linuxreclen); 639 if (error == 0) 640 td->td_retval[0] = linuxreclen; 641 642 free(lbuf, M_TEMP); 643 out: 644 free(buf, M_TEMP); 645 return (error); 646 } 647 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 648 649 /* 650 * These exist mainly for hooks for doing /compat/linux translation. 651 */ 652 653 #ifdef LINUX_LEGACY_SYSCALLS 654 int 655 linux_access(struct thread *td, struct linux_access_args *args) 656 { 657 char *path; 658 int error; 659 660 /* Linux convention. */ 661 if (args->amode & ~(F_OK | X_OK | W_OK | R_OK)) 662 return (EINVAL); 663 664 if (!LUSECONVPATH(td)) { 665 error = kern_accessat(td, AT_FDCWD, args->path, UIO_USERSPACE, 0, 666 args->amode); 667 } else { 668 LCONVPATHEXIST(args->path, &path); 669 error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE, 0, 670 args->amode); 671 LFREEPATH(path); 672 } 673 674 return (error); 675 } 676 #endif 677 678 static int 679 linux_do_accessat(struct thread *td, int ldfd, const char *filename, 680 int amode, int flags) 681 { 682 char *path; 683 int error, dfd; 684 685 /* Linux convention. */ 686 if (amode & ~(F_OK | X_OK | W_OK | R_OK)) 687 return (EINVAL); 688 689 dfd = (ldfd == LINUX_AT_FDCWD) ? AT_FDCWD : ldfd; 690 if (!LUSECONVPATH(td)) { 691 error = kern_accessat(td, dfd, filename, UIO_USERSPACE, flags, amode); 692 } else { 693 LCONVPATHEXIST_AT(filename, &path, dfd); 694 error = kern_accessat(td, dfd, path, UIO_SYSSPACE, flags, amode); 695 LFREEPATH(path); 696 } 697 698 return (error); 699 } 700 701 int 702 linux_faccessat(struct thread *td, struct linux_faccessat_args *args) 703 { 704 705 return (linux_do_accessat(td, args->dfd, args->filename, args->amode, 706 0)); 707 } 708 709 int 710 linux_faccessat2(struct thread *td, struct linux_faccessat2_args *args) 711 { 712 int flags, unsupported; 713 714 /* XXX. AT_SYMLINK_NOFOLLOW is not supported by kern_accessat */ 715 unsupported = args->flags & ~(LINUX_AT_EACCESS | LINUX_AT_EMPTY_PATH); 716 if (unsupported != 0) { 717 linux_msg(td, "faccessat2 unsupported flag 0x%x", unsupported); 718 return (EINVAL); 719 } 720 721 flags = (args->flags & LINUX_AT_EACCESS) == 0 ? 0 : 722 AT_EACCESS; 723 flags |= (args->flags & LINUX_AT_EMPTY_PATH) == 0 ? 0 : 724 AT_EMPTY_PATH; 725 return (linux_do_accessat(td, args->dfd, args->filename, args->amode, 726 flags)); 727 } 728 729 730 #ifdef LINUX_LEGACY_SYSCALLS 731 int 732 linux_unlink(struct thread *td, struct linux_unlink_args *args) 733 { 734 char *path; 735 int error; 736 struct stat st; 737 738 if (!LUSECONVPATH(td)) { 739 error = kern_funlinkat(td, AT_FDCWD, args->path, FD_NONE, 740 UIO_USERSPACE, 0, 0); 741 if (error == EPERM) { 742 /* Introduce POSIX noncompliant behaviour of Linux */ 743 if (kern_statat(td, 0, AT_FDCWD, args->path, 744 UIO_SYSSPACE, &st, NULL) == 0) { 745 if (S_ISDIR(st.st_mode)) 746 error = EISDIR; 747 } 748 } 749 } else { 750 LCONVPATHEXIST(args->path, &path); 751 error = kern_funlinkat(td, AT_FDCWD, path, FD_NONE, UIO_SYSSPACE, 0, 0); 752 if (error == EPERM) { 753 /* Introduce POSIX noncompliant behaviour of Linux */ 754 if (kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st, 755 NULL) == 0) { 756 if (S_ISDIR(st.st_mode)) 757 error = EISDIR; 758 } 759 } 760 LFREEPATH(path); 761 } 762 763 return (error); 764 } 765 #endif 766 767 static int 768 linux_unlinkat_impl(struct thread *td, enum uio_seg pathseg, const char *path, 769 int dfd, struct linux_unlinkat_args *args) 770 { 771 struct stat st; 772 int error; 773 774 if (args->flag & LINUX_AT_REMOVEDIR) 775 error = kern_frmdirat(td, dfd, path, FD_NONE, pathseg, 0); 776 else 777 error = kern_funlinkat(td, dfd, path, FD_NONE, pathseg, 0, 0); 778 if (error == EPERM && !(args->flag & LINUX_AT_REMOVEDIR)) { 779 /* Introduce POSIX noncompliant behaviour of Linux */ 780 if (kern_statat(td, AT_SYMLINK_NOFOLLOW, dfd, path, 781 UIO_SYSSPACE, &st, NULL) == 0 && S_ISDIR(st.st_mode)) 782 error = EISDIR; 783 } 784 return (error); 785 } 786 787 int 788 linux_unlinkat(struct thread *td, struct linux_unlinkat_args *args) 789 { 790 char *path; 791 int error, dfd; 792 793 if (args->flag & ~LINUX_AT_REMOVEDIR) 794 return (EINVAL); 795 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 796 if (!LUSECONVPATH(td)) { 797 return (linux_unlinkat_impl(td, UIO_USERSPACE, args->pathname, 798 dfd, args)); 799 } 800 LCONVPATHEXIST_AT(args->pathname, &path, dfd); 801 error = linux_unlinkat_impl(td, UIO_SYSSPACE, path, dfd, args); 802 LFREEPATH(path); 803 return (error); 804 } 805 int 806 linux_chdir(struct thread *td, struct linux_chdir_args *args) 807 { 808 char *path; 809 int error; 810 811 if (!LUSECONVPATH(td)) { 812 return (kern_chdir(td, args->path, UIO_USERSPACE)); 813 } 814 LCONVPATHEXIST(args->path, &path); 815 error = kern_chdir(td, path, UIO_SYSSPACE); 816 LFREEPATH(path); 817 return (error); 818 } 819 820 #ifdef LINUX_LEGACY_SYSCALLS 821 int 822 linux_chmod(struct thread *td, struct linux_chmod_args *args) 823 { 824 char *path; 825 int error; 826 827 if (!LUSECONVPATH(td)) { 828 return (kern_fchmodat(td, AT_FDCWD, args->path, UIO_USERSPACE, 829 args->mode, 0)); 830 } 831 LCONVPATHEXIST(args->path, &path); 832 error = kern_fchmodat(td, AT_FDCWD, path, UIO_SYSSPACE, args->mode, 0); 833 LFREEPATH(path); 834 return (error); 835 } 836 #endif 837 838 int 839 linux_fchmodat(struct thread *td, struct linux_fchmodat_args *args) 840 { 841 char *path; 842 int error, dfd; 843 844 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 845 if (!LUSECONVPATH(td)) { 846 return (kern_fchmodat(td, dfd, args->filename, UIO_USERSPACE, 847 args->mode, 0)); 848 } 849 LCONVPATHEXIST_AT(args->filename, &path, dfd); 850 error = kern_fchmodat(td, dfd, path, UIO_SYSSPACE, args->mode, 0); 851 LFREEPATH(path); 852 return (error); 853 } 854 855 #ifdef LINUX_LEGACY_SYSCALLS 856 int 857 linux_mkdir(struct thread *td, struct linux_mkdir_args *args) 858 { 859 char *path; 860 int error; 861 862 if (!LUSECONVPATH(td)) { 863 return (kern_mkdirat(td, AT_FDCWD, args->path, UIO_USERSPACE, args->mode)); 864 } 865 LCONVPATHCREAT(args->path, &path); 866 error = kern_mkdirat(td, AT_FDCWD, path, UIO_SYSSPACE, args->mode); 867 LFREEPATH(path); 868 return (error); 869 } 870 #endif 871 872 int 873 linux_mkdirat(struct thread *td, struct linux_mkdirat_args *args) 874 { 875 char *path; 876 int error, dfd; 877 878 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 879 if (!LUSECONVPATH(td)) { 880 return (kern_mkdirat(td, dfd, args->pathname, UIO_USERSPACE, args->mode)); 881 } 882 LCONVPATHCREAT_AT(args->pathname, &path, dfd); 883 error = kern_mkdirat(td, dfd, path, UIO_SYSSPACE, args->mode); 884 LFREEPATH(path); 885 return (error); 886 } 887 888 #ifdef LINUX_LEGACY_SYSCALLS 889 int 890 linux_rmdir(struct thread *td, struct linux_rmdir_args *args) 891 { 892 char *path; 893 int error; 894 895 if (!LUSECONVPATH(td)) { 896 return (kern_frmdirat(td, AT_FDCWD, args->path, FD_NONE, 897 UIO_USERSPACE, 0)); 898 } 899 LCONVPATHEXIST(args->path, &path); 900 error = kern_frmdirat(td, AT_FDCWD, path, FD_NONE, UIO_SYSSPACE, 0); 901 LFREEPATH(path); 902 return (error); 903 } 904 905 int 906 linux_rename(struct thread *td, struct linux_rename_args *args) 907 { 908 char *from, *to; 909 int error; 910 911 if (!LUSECONVPATH(td)) { 912 return (kern_renameat(td, AT_FDCWD, args->from, AT_FDCWD, 913 args->to, UIO_USERSPACE)); 914 } 915 LCONVPATHEXIST(args->from, &from); 916 /* Expand LCONVPATHCREATE so that `from' can be freed on errors */ 917 error = linux_emul_convpath(args->to, UIO_USERSPACE, &to, 1, AT_FDCWD); 918 if (to == NULL) { 919 LFREEPATH(from); 920 return (error); 921 } 922 error = kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, UIO_SYSSPACE); 923 LFREEPATH(from); 924 LFREEPATH(to); 925 return (error); 926 } 927 #endif 928 929 int 930 linux_renameat(struct thread *td, struct linux_renameat_args *args) 931 { 932 struct linux_renameat2_args renameat2_args = { 933 .olddfd = args->olddfd, 934 .oldname = args->oldname, 935 .newdfd = args->newdfd, 936 .newname = args->newname, 937 .flags = 0 938 }; 939 940 return (linux_renameat2(td, &renameat2_args)); 941 } 942 943 int 944 linux_renameat2(struct thread *td, struct linux_renameat2_args *args) 945 { 946 char *from, *to; 947 int error, olddfd, newdfd; 948 949 if (args->flags != 0) { 950 if (args->flags & ~(LINUX_RENAME_EXCHANGE | 951 LINUX_RENAME_NOREPLACE | LINUX_RENAME_WHITEOUT)) 952 return (EINVAL); 953 if (args->flags & LINUX_RENAME_EXCHANGE && 954 args->flags & (LINUX_RENAME_NOREPLACE | 955 LINUX_RENAME_WHITEOUT)) 956 return (EINVAL); 957 #if 0 958 /* 959 * This spams the console on Ubuntu Focal. 960 * 961 * What's needed here is a general mechanism to let users know 962 * about missing features without hogging the system. 963 */ 964 linux_msg(td, "renameat2 unsupported flags 0x%x", 965 args->flags); 966 #endif 967 return (EINVAL); 968 } 969 970 olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd; 971 newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd; 972 if (!LUSECONVPATH(td)) { 973 return (kern_renameat(td, olddfd, args->oldname, newdfd, 974 args->newname, UIO_USERSPACE)); 975 } 976 LCONVPATHEXIST_AT(args->oldname, &from, olddfd); 977 /* Expand LCONVPATHCREATE so that `from' can be freed on errors */ 978 error = linux_emul_convpath(args->newname, UIO_USERSPACE, &to, 1, newdfd); 979 if (to == NULL) { 980 LFREEPATH(from); 981 return (error); 982 } 983 error = kern_renameat(td, olddfd, from, newdfd, to, UIO_SYSSPACE); 984 LFREEPATH(from); 985 LFREEPATH(to); 986 return (error); 987 } 988 989 #ifdef LINUX_LEGACY_SYSCALLS 990 int 991 linux_symlink(struct thread *td, struct linux_symlink_args *args) 992 { 993 char *path, *to; 994 int error; 995 996 if (!LUSECONVPATH(td)) { 997 return (kern_symlinkat(td, args->path, AT_FDCWD, args->to, 998 UIO_USERSPACE)); 999 } 1000 LCONVPATHEXIST(args->path, &path); 1001 /* Expand LCONVPATHCREATE so that `path' can be freed on errors */ 1002 error = linux_emul_convpath(args->to, UIO_USERSPACE, &to, 1, AT_FDCWD); 1003 if (to == NULL) { 1004 LFREEPATH(path); 1005 return (error); 1006 } 1007 error = kern_symlinkat(td, path, AT_FDCWD, to, UIO_SYSSPACE); 1008 LFREEPATH(path); 1009 LFREEPATH(to); 1010 return (error); 1011 } 1012 #endif 1013 1014 int 1015 linux_symlinkat(struct thread *td, struct linux_symlinkat_args *args) 1016 { 1017 char *path, *to; 1018 int error, dfd; 1019 1020 dfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd; 1021 if (!LUSECONVPATH(td)) { 1022 return (kern_symlinkat(td, args->oldname, dfd, args->newname, 1023 UIO_USERSPACE)); 1024 } 1025 LCONVPATHEXIST(args->oldname, &path); 1026 /* Expand LCONVPATHCREATE so that `path' can be freed on errors */ 1027 error = linux_emul_convpath(args->newname, UIO_USERSPACE, &to, 1, dfd); 1028 if (to == NULL) { 1029 LFREEPATH(path); 1030 return (error); 1031 } 1032 error = kern_symlinkat(td, path, dfd, to, UIO_SYSSPACE); 1033 LFREEPATH(path); 1034 LFREEPATH(to); 1035 return (error); 1036 } 1037 1038 #ifdef LINUX_LEGACY_SYSCALLS 1039 int 1040 linux_readlink(struct thread *td, struct linux_readlink_args *args) 1041 { 1042 char *name; 1043 int error; 1044 1045 if (!LUSECONVPATH(td)) { 1046 return (kern_readlinkat(td, AT_FDCWD, args->name, UIO_USERSPACE, 1047 args->buf, UIO_USERSPACE, args->count)); 1048 } 1049 LCONVPATHEXIST(args->name, &name); 1050 error = kern_readlinkat(td, AT_FDCWD, name, UIO_SYSSPACE, 1051 args->buf, UIO_USERSPACE, args->count); 1052 LFREEPATH(name); 1053 return (error); 1054 } 1055 #endif 1056 1057 int 1058 linux_readlinkat(struct thread *td, struct linux_readlinkat_args *args) 1059 { 1060 char *name; 1061 int error, dfd; 1062 1063 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 1064 if (!LUSECONVPATH(td)) { 1065 return (kern_readlinkat(td, dfd, args->path, UIO_USERSPACE, 1066 args->buf, UIO_USERSPACE, args->bufsiz)); 1067 } 1068 LCONVPATHEXIST_AT(args->path, &name, dfd); 1069 error = kern_readlinkat(td, dfd, name, UIO_SYSSPACE, args->buf, 1070 UIO_USERSPACE, args->bufsiz); 1071 LFREEPATH(name); 1072 return (error); 1073 } 1074 1075 int 1076 linux_truncate(struct thread *td, struct linux_truncate_args *args) 1077 { 1078 char *path; 1079 int error; 1080 1081 if (!LUSECONVPATH(td)) { 1082 return (kern_truncate(td, args->path, UIO_USERSPACE, args->length)); 1083 } 1084 LCONVPATHEXIST(args->path, &path); 1085 error = kern_truncate(td, path, UIO_SYSSPACE, args->length); 1086 LFREEPATH(path); 1087 return (error); 1088 } 1089 1090 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 1091 int 1092 linux_truncate64(struct thread *td, struct linux_truncate64_args *args) 1093 { 1094 char *path; 1095 off_t length; 1096 int error; 1097 1098 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1099 length = PAIR32TO64(off_t, args->length); 1100 #else 1101 length = args->length; 1102 #endif 1103 1104 if (!LUSECONVPATH(td)) { 1105 return (kern_truncate(td, args->path, UIO_USERSPACE, length)); 1106 } 1107 LCONVPATHEXIST(args->path, &path); 1108 error = kern_truncate(td, path, UIO_SYSSPACE, length); 1109 LFREEPATH(path); 1110 return (error); 1111 } 1112 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 1113 1114 int 1115 linux_ftruncate(struct thread *td, struct linux_ftruncate_args *args) 1116 { 1117 1118 return (kern_ftruncate(td, args->fd, args->length)); 1119 } 1120 1121 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 1122 int 1123 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args) 1124 { 1125 off_t length; 1126 1127 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1128 length = PAIR32TO64(off_t, args->length); 1129 #else 1130 length = args->length; 1131 #endif 1132 1133 return (kern_ftruncate(td, args->fd, length)); 1134 } 1135 #endif 1136 1137 #ifdef LINUX_LEGACY_SYSCALLS 1138 int 1139 linux_link(struct thread *td, struct linux_link_args *args) 1140 { 1141 char *path, *to; 1142 int error; 1143 1144 if (!LUSECONVPATH(td)) { 1145 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, args->path, args->to, 1146 UIO_USERSPACE, AT_SYMLINK_FOLLOW)); 1147 } 1148 LCONVPATHEXIST(args->path, &path); 1149 /* Expand LCONVPATHCREATE so that `path' can be freed on errors */ 1150 error = linux_emul_convpath(args->to, UIO_USERSPACE, &to, 1, AT_FDCWD); 1151 if (to == NULL) { 1152 LFREEPATH(path); 1153 return (error); 1154 } 1155 error = kern_linkat(td, AT_FDCWD, AT_FDCWD, path, to, UIO_SYSSPACE, 1156 AT_SYMLINK_FOLLOW); 1157 LFREEPATH(path); 1158 LFREEPATH(to); 1159 return (error); 1160 } 1161 #endif 1162 1163 int 1164 linux_linkat(struct thread *td, struct linux_linkat_args *args) 1165 { 1166 char *path, *to; 1167 int error, olddfd, newdfd, flag; 1168 1169 if (args->flag & ~(LINUX_AT_SYMLINK_FOLLOW | LINUX_AT_EMPTY_PATH)) 1170 return (EINVAL); 1171 1172 flag = (args->flag & LINUX_AT_SYMLINK_FOLLOW) != 0 ? AT_SYMLINK_FOLLOW : 1173 0; 1174 flag |= (args->flag & LINUX_AT_EMPTY_PATH) != 0 ? AT_EMPTY_PATH : 0; 1175 1176 olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd; 1177 newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd; 1178 if (!LUSECONVPATH(td)) { 1179 return (kern_linkat(td, olddfd, newdfd, args->oldname, 1180 args->newname, UIO_USERSPACE, flag)); 1181 } 1182 LCONVPATHEXIST_AT(args->oldname, &path, olddfd); 1183 /* Expand LCONVPATHCREATE so that `path' can be freed on errors */ 1184 error = linux_emul_convpath(args->newname, UIO_USERSPACE, &to, 1, newdfd); 1185 if (to == NULL) { 1186 LFREEPATH(path); 1187 return (error); 1188 } 1189 error = kern_linkat(td, olddfd, newdfd, path, to, UIO_SYSSPACE, flag); 1190 LFREEPATH(path); 1191 LFREEPATH(to); 1192 return (error); 1193 } 1194 1195 int 1196 linux_fdatasync(struct thread *td, struct linux_fdatasync_args *uap) 1197 { 1198 1199 return (kern_fsync(td, uap->fd, false)); 1200 } 1201 1202 int 1203 linux_sync_file_range(struct thread *td, struct linux_sync_file_range_args *uap) 1204 { 1205 off_t nbytes, offset; 1206 1207 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1208 nbytes = PAIR32TO64(off_t, uap->nbytes); 1209 offset = PAIR32TO64(off_t, uap->offset); 1210 #else 1211 nbytes = uap->nbytes; 1212 offset = uap->offset; 1213 #endif 1214 1215 if (offset < 0 || nbytes < 0 || 1216 (uap->flags & ~(LINUX_SYNC_FILE_RANGE_WAIT_BEFORE | 1217 LINUX_SYNC_FILE_RANGE_WRITE | 1218 LINUX_SYNC_FILE_RANGE_WAIT_AFTER)) != 0) { 1219 return (EINVAL); 1220 } 1221 1222 return (kern_fsync(td, uap->fd, false)); 1223 } 1224 1225 int 1226 linux_pread(struct thread *td, struct linux_pread_args *uap) 1227 { 1228 struct vnode *vp; 1229 off_t offset; 1230 int error; 1231 1232 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1233 offset = PAIR32TO64(off_t, uap->offset); 1234 #else 1235 offset = uap->offset; 1236 #endif 1237 1238 error = kern_pread(td, uap->fd, uap->buf, uap->nbyte, offset); 1239 if (error == 0) { 1240 /* This seems to violate POSIX but Linux does it. */ 1241 error = fgetvp(td, uap->fd, &cap_pread_rights, &vp); 1242 if (error != 0) 1243 return (error); 1244 if (vp->v_type == VDIR) 1245 error = EISDIR; 1246 vrele(vp); 1247 } 1248 return (error); 1249 } 1250 1251 int 1252 linux_pwrite(struct thread *td, struct linux_pwrite_args *uap) 1253 { 1254 off_t offset; 1255 1256 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1257 offset = PAIR32TO64(off_t, uap->offset); 1258 #else 1259 offset = uap->offset; 1260 #endif 1261 1262 return (kern_pwrite(td, uap->fd, uap->buf, uap->nbyte, offset)); 1263 } 1264 1265 int 1266 linux_preadv(struct thread *td, struct linux_preadv_args *uap) 1267 { 1268 struct uio *auio; 1269 int error; 1270 off_t offset; 1271 1272 /* 1273 * According http://man7.org/linux/man-pages/man2/preadv.2.html#NOTES 1274 * pos_l and pos_h, respectively, contain the 1275 * low order and high order 32 bits of offset. 1276 */ 1277 offset = (((off_t)uap->pos_h << (sizeof(offset) * 4)) << 1278 (sizeof(offset) * 4)) | uap->pos_l; 1279 if (offset < 0) 1280 return (EINVAL); 1281 #ifdef COMPAT_LINUX32 1282 error = linux32_copyinuio(PTRIN(uap->vec), uap->vlen, &auio); 1283 #else 1284 error = copyinuio(uap->vec, uap->vlen, &auio); 1285 #endif 1286 if (error != 0) 1287 return (error); 1288 error = kern_preadv(td, uap->fd, auio, offset); 1289 free(auio, M_IOV); 1290 return (error); 1291 } 1292 1293 int 1294 linux_pwritev(struct thread *td, struct linux_pwritev_args *uap) 1295 { 1296 struct uio *auio; 1297 int error; 1298 off_t offset; 1299 1300 /* 1301 * According http://man7.org/linux/man-pages/man2/pwritev.2.html#NOTES 1302 * pos_l and pos_h, respectively, contain the 1303 * low order and high order 32 bits of offset. 1304 */ 1305 offset = (((off_t)uap->pos_h << (sizeof(offset) * 4)) << 1306 (sizeof(offset) * 4)) | uap->pos_l; 1307 if (offset < 0) 1308 return (EINVAL); 1309 #ifdef COMPAT_LINUX32 1310 error = linux32_copyinuio(PTRIN(uap->vec), uap->vlen, &auio); 1311 #else 1312 error = copyinuio(uap->vec, uap->vlen, &auio); 1313 #endif 1314 if (error != 0) 1315 return (error); 1316 error = kern_pwritev(td, uap->fd, auio, offset); 1317 free(auio, M_IOV); 1318 return (error); 1319 } 1320 1321 int 1322 linux_mount(struct thread *td, struct linux_mount_args *args) 1323 { 1324 struct mntarg *ma = NULL; 1325 char *fstypename, *mntonname, *mntfromname, *data; 1326 int error, fsflags; 1327 1328 fstypename = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1329 mntonname = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1330 mntfromname = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1331 data = NULL; 1332 error = copyinstr(args->filesystemtype, fstypename, MNAMELEN - 1, 1333 NULL); 1334 if (error != 0) 1335 goto out; 1336 if (args->specialfile != NULL) { 1337 error = copyinstr(args->specialfile, mntfromname, MNAMELEN - 1, NULL); 1338 if (error != 0) 1339 goto out; 1340 } else { 1341 mntfromname[0] = '\0'; 1342 } 1343 error = copyinstr(args->dir, mntonname, MNAMELEN - 1, NULL); 1344 if (error != 0) 1345 goto out; 1346 1347 if (strcmp(fstypename, "ext2") == 0) { 1348 strcpy(fstypename, "ext2fs"); 1349 } else if (strcmp(fstypename, "proc") == 0) { 1350 strcpy(fstypename, "linprocfs"); 1351 } else if (strcmp(fstypename, "vfat") == 0) { 1352 strcpy(fstypename, "msdosfs"); 1353 } else if (strcmp(fstypename, "fuse") == 0 || 1354 strncmp(fstypename, "fuse.", 5) == 0) { 1355 char *fuse_options, *fuse_option, *fuse_name; 1356 1357 strcpy(mntfromname, "/dev/fuse"); 1358 strcpy(fstypename, "fusefs"); 1359 data = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1360 error = copyinstr(args->data, data, MNAMELEN - 1, NULL); 1361 if (error != 0) 1362 goto out; 1363 1364 fuse_options = data; 1365 while ((fuse_option = strsep(&fuse_options, ",")) != NULL) { 1366 fuse_name = strsep(&fuse_option, "="); 1367 if (fuse_name == NULL || fuse_option == NULL) 1368 goto out; 1369 ma = mount_arg(ma, fuse_name, fuse_option, -1); 1370 } 1371 1372 /* 1373 * The FUSE server uses Linux errno values instead of FreeBSD 1374 * ones; add a flag to tell fuse(4) to do errno translation. 1375 */ 1376 ma = mount_arg(ma, "linux_errnos", "1", -1); 1377 } 1378 1379 fsflags = 0; 1380 1381 /* 1382 * Linux SYNC flag is not included; the closest equivalent 1383 * FreeBSD has is !ASYNC, which is our default. 1384 */ 1385 if (args->rwflag & LINUX_MS_RDONLY) 1386 fsflags |= MNT_RDONLY; 1387 if (args->rwflag & LINUX_MS_NOSUID) 1388 fsflags |= MNT_NOSUID; 1389 if (args->rwflag & LINUX_MS_NOEXEC) 1390 fsflags |= MNT_NOEXEC; 1391 if (args->rwflag & LINUX_MS_REMOUNT) 1392 fsflags |= MNT_UPDATE; 1393 1394 ma = mount_arg(ma, "fstype", fstypename, -1); 1395 ma = mount_arg(ma, "fspath", mntonname, -1); 1396 ma = mount_arg(ma, "from", mntfromname, -1); 1397 error = kernel_mount(ma, fsflags); 1398 out: 1399 free(fstypename, M_TEMP); 1400 free(mntonname, M_TEMP); 1401 free(mntfromname, M_TEMP); 1402 free(data, M_TEMP); 1403 return (error); 1404 } 1405 1406 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 1407 int 1408 linux_oldumount(struct thread *td, struct linux_oldumount_args *args) 1409 { 1410 1411 return (kern_unmount(td, args->path, 0)); 1412 } 1413 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 1414 1415 #ifdef LINUX_LEGACY_SYSCALLS 1416 int 1417 linux_umount(struct thread *td, struct linux_umount_args *args) 1418 { 1419 int flags; 1420 1421 flags = 0; 1422 if ((args->flags & LINUX_MNT_FORCE) != 0) { 1423 args->flags &= ~LINUX_MNT_FORCE; 1424 flags |= MNT_FORCE; 1425 } 1426 if (args->flags != 0) { 1427 linux_msg(td, "unsupported umount2 flags %#x", args->flags); 1428 return (EINVAL); 1429 } 1430 1431 return (kern_unmount(td, args->path, flags)); 1432 } 1433 #endif 1434 1435 /* 1436 * fcntl family of syscalls 1437 */ 1438 1439 struct l_flock { 1440 l_short l_type; 1441 l_short l_whence; 1442 l_off_t l_start; 1443 l_off_t l_len; 1444 l_pid_t l_pid; 1445 } 1446 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1447 __packed 1448 #endif 1449 ; 1450 1451 static void 1452 linux_to_bsd_flock(struct l_flock *linux_flock, struct flock *bsd_flock) 1453 { 1454 switch (linux_flock->l_type) { 1455 case LINUX_F_RDLCK: 1456 bsd_flock->l_type = F_RDLCK; 1457 break; 1458 case LINUX_F_WRLCK: 1459 bsd_flock->l_type = F_WRLCK; 1460 break; 1461 case LINUX_F_UNLCK: 1462 bsd_flock->l_type = F_UNLCK; 1463 break; 1464 default: 1465 bsd_flock->l_type = -1; 1466 break; 1467 } 1468 bsd_flock->l_whence = linux_flock->l_whence; 1469 bsd_flock->l_start = (off_t)linux_flock->l_start; 1470 bsd_flock->l_len = (off_t)linux_flock->l_len; 1471 bsd_flock->l_pid = (pid_t)linux_flock->l_pid; 1472 bsd_flock->l_sysid = 0; 1473 } 1474 1475 static void 1476 bsd_to_linux_flock(struct flock *bsd_flock, struct l_flock *linux_flock) 1477 { 1478 switch (bsd_flock->l_type) { 1479 case F_RDLCK: 1480 linux_flock->l_type = LINUX_F_RDLCK; 1481 break; 1482 case F_WRLCK: 1483 linux_flock->l_type = LINUX_F_WRLCK; 1484 break; 1485 case F_UNLCK: 1486 linux_flock->l_type = LINUX_F_UNLCK; 1487 break; 1488 } 1489 linux_flock->l_whence = bsd_flock->l_whence; 1490 linux_flock->l_start = (l_off_t)bsd_flock->l_start; 1491 linux_flock->l_len = (l_off_t)bsd_flock->l_len; 1492 linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid; 1493 } 1494 1495 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 1496 struct l_flock64 { 1497 l_short l_type; 1498 l_short l_whence; 1499 l_loff_t l_start; 1500 l_loff_t l_len; 1501 l_pid_t l_pid; 1502 } 1503 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1504 __packed 1505 #endif 1506 ; 1507 1508 static void 1509 linux_to_bsd_flock64(struct l_flock64 *linux_flock, struct flock *bsd_flock) 1510 { 1511 switch (linux_flock->l_type) { 1512 case LINUX_F_RDLCK: 1513 bsd_flock->l_type = F_RDLCK; 1514 break; 1515 case LINUX_F_WRLCK: 1516 bsd_flock->l_type = F_WRLCK; 1517 break; 1518 case LINUX_F_UNLCK: 1519 bsd_flock->l_type = F_UNLCK; 1520 break; 1521 default: 1522 bsd_flock->l_type = -1; 1523 break; 1524 } 1525 bsd_flock->l_whence = linux_flock->l_whence; 1526 bsd_flock->l_start = (off_t)linux_flock->l_start; 1527 bsd_flock->l_len = (off_t)linux_flock->l_len; 1528 bsd_flock->l_pid = (pid_t)linux_flock->l_pid; 1529 bsd_flock->l_sysid = 0; 1530 } 1531 1532 static void 1533 bsd_to_linux_flock64(struct flock *bsd_flock, struct l_flock64 *linux_flock) 1534 { 1535 switch (bsd_flock->l_type) { 1536 case F_RDLCK: 1537 linux_flock->l_type = LINUX_F_RDLCK; 1538 break; 1539 case F_WRLCK: 1540 linux_flock->l_type = LINUX_F_WRLCK; 1541 break; 1542 case F_UNLCK: 1543 linux_flock->l_type = LINUX_F_UNLCK; 1544 break; 1545 } 1546 linux_flock->l_whence = bsd_flock->l_whence; 1547 linux_flock->l_start = (l_loff_t)bsd_flock->l_start; 1548 linux_flock->l_len = (l_loff_t)bsd_flock->l_len; 1549 linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid; 1550 } 1551 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 1552 1553 static int 1554 fcntl_common(struct thread *td, struct linux_fcntl_args *args) 1555 { 1556 struct l_flock linux_flock; 1557 struct flock bsd_flock; 1558 struct pipe *fpipe; 1559 struct file *fp; 1560 long arg; 1561 int error, result; 1562 1563 switch (args->cmd) { 1564 case LINUX_F_DUPFD: 1565 return (kern_fcntl(td, args->fd, F_DUPFD, args->arg)); 1566 1567 case LINUX_F_GETFD: 1568 return (kern_fcntl(td, args->fd, F_GETFD, 0)); 1569 1570 case LINUX_F_SETFD: 1571 return (kern_fcntl(td, args->fd, F_SETFD, args->arg)); 1572 1573 case LINUX_F_GETFL: 1574 error = kern_fcntl(td, args->fd, F_GETFL, 0); 1575 result = td->td_retval[0]; 1576 td->td_retval[0] = 0; 1577 if (result & O_RDONLY) 1578 td->td_retval[0] |= LINUX_O_RDONLY; 1579 if (result & O_WRONLY) 1580 td->td_retval[0] |= LINUX_O_WRONLY; 1581 if (result & O_RDWR) 1582 td->td_retval[0] |= LINUX_O_RDWR; 1583 if (result & O_NDELAY) 1584 td->td_retval[0] |= LINUX_O_NONBLOCK; 1585 if (result & O_APPEND) 1586 td->td_retval[0] |= LINUX_O_APPEND; 1587 if (result & O_FSYNC) 1588 td->td_retval[0] |= LINUX_O_SYNC; 1589 if (result & O_ASYNC) 1590 td->td_retval[0] |= LINUX_O_ASYNC; 1591 #ifdef LINUX_O_NOFOLLOW 1592 if (result & O_NOFOLLOW) 1593 td->td_retval[0] |= LINUX_O_NOFOLLOW; 1594 #endif 1595 #ifdef LINUX_O_DIRECT 1596 if (result & O_DIRECT) 1597 td->td_retval[0] |= LINUX_O_DIRECT; 1598 #endif 1599 return (error); 1600 1601 case LINUX_F_SETFL: 1602 arg = 0; 1603 if (args->arg & LINUX_O_NDELAY) 1604 arg |= O_NONBLOCK; 1605 if (args->arg & LINUX_O_APPEND) 1606 arg |= O_APPEND; 1607 if (args->arg & LINUX_O_SYNC) 1608 arg |= O_FSYNC; 1609 if (args->arg & LINUX_O_ASYNC) 1610 arg |= O_ASYNC; 1611 #ifdef LINUX_O_NOFOLLOW 1612 if (args->arg & LINUX_O_NOFOLLOW) 1613 arg |= O_NOFOLLOW; 1614 #endif 1615 #ifdef LINUX_O_DIRECT 1616 if (args->arg & LINUX_O_DIRECT) 1617 arg |= O_DIRECT; 1618 #endif 1619 return (kern_fcntl(td, args->fd, F_SETFL, arg)); 1620 1621 case LINUX_F_GETLK: 1622 error = copyin((void *)args->arg, &linux_flock, 1623 sizeof(linux_flock)); 1624 if (error) 1625 return (error); 1626 linux_to_bsd_flock(&linux_flock, &bsd_flock); 1627 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock); 1628 if (error) 1629 return (error); 1630 bsd_to_linux_flock(&bsd_flock, &linux_flock); 1631 return (copyout(&linux_flock, (void *)args->arg, 1632 sizeof(linux_flock))); 1633 1634 case LINUX_F_SETLK: 1635 error = copyin((void *)args->arg, &linux_flock, 1636 sizeof(linux_flock)); 1637 if (error) 1638 return (error); 1639 linux_to_bsd_flock(&linux_flock, &bsd_flock); 1640 return (kern_fcntl(td, args->fd, F_SETLK, 1641 (intptr_t)&bsd_flock)); 1642 1643 case LINUX_F_SETLKW: 1644 error = copyin((void *)args->arg, &linux_flock, 1645 sizeof(linux_flock)); 1646 if (error) 1647 return (error); 1648 linux_to_bsd_flock(&linux_flock, &bsd_flock); 1649 return (kern_fcntl(td, args->fd, F_SETLKW, 1650 (intptr_t)&bsd_flock)); 1651 1652 case LINUX_F_GETOWN: 1653 return (kern_fcntl(td, args->fd, F_GETOWN, 0)); 1654 1655 case LINUX_F_SETOWN: 1656 /* 1657 * XXX some Linux applications depend on F_SETOWN having no 1658 * significant effect for pipes (SIGIO is not delivered for 1659 * pipes under Linux-2.2.35 at least). 1660 */ 1661 error = fget(td, args->fd, 1662 &cap_fcntl_rights, &fp); 1663 if (error) 1664 return (error); 1665 if (fp->f_type == DTYPE_PIPE) { 1666 fdrop(fp, td); 1667 return (EINVAL); 1668 } 1669 fdrop(fp, td); 1670 1671 return (kern_fcntl(td, args->fd, F_SETOWN, args->arg)); 1672 1673 case LINUX_F_DUPFD_CLOEXEC: 1674 return (kern_fcntl(td, args->fd, F_DUPFD_CLOEXEC, args->arg)); 1675 /* 1676 * Our F_SEAL_* values match Linux one for maximum compatibility. So we 1677 * only needed to account for different values for fcntl(2) commands. 1678 */ 1679 case LINUX_F_GET_SEALS: 1680 error = kern_fcntl(td, args->fd, F_GET_SEALS, 0); 1681 if (error != 0) 1682 return (error); 1683 td->td_retval[0] = bsd_to_linux_bits(td->td_retval[0], 1684 seal_bitmap, 0); 1685 return (0); 1686 1687 case LINUX_F_ADD_SEALS: 1688 return (kern_fcntl(td, args->fd, F_ADD_SEALS, 1689 linux_to_bsd_bits(args->arg, seal_bitmap, 0))); 1690 1691 case LINUX_F_GETPIPE_SZ: 1692 error = fget(td, args->fd, 1693 &cap_fcntl_rights, &fp); 1694 if (error != 0) 1695 return (error); 1696 if (fp->f_type != DTYPE_PIPE) { 1697 fdrop(fp, td); 1698 return (EINVAL); 1699 } 1700 fpipe = fp->f_data; 1701 td->td_retval[0] = fpipe->pipe_buffer.size; 1702 fdrop(fp, td); 1703 return (0); 1704 1705 default: 1706 linux_msg(td, "unsupported fcntl cmd %d", args->cmd); 1707 return (EINVAL); 1708 } 1709 } 1710 1711 int 1712 linux_fcntl(struct thread *td, struct linux_fcntl_args *args) 1713 { 1714 1715 return (fcntl_common(td, args)); 1716 } 1717 1718 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 1719 int 1720 linux_fcntl64(struct thread *td, struct linux_fcntl64_args *args) 1721 { 1722 struct l_flock64 linux_flock; 1723 struct flock bsd_flock; 1724 struct linux_fcntl_args fcntl_args; 1725 int error; 1726 1727 switch (args->cmd) { 1728 case LINUX_F_GETLK64: 1729 error = copyin((void *)args->arg, &linux_flock, 1730 sizeof(linux_flock)); 1731 if (error) 1732 return (error); 1733 linux_to_bsd_flock64(&linux_flock, &bsd_flock); 1734 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock); 1735 if (error) 1736 return (error); 1737 bsd_to_linux_flock64(&bsd_flock, &linux_flock); 1738 return (copyout(&linux_flock, (void *)args->arg, 1739 sizeof(linux_flock))); 1740 1741 case LINUX_F_SETLK64: 1742 error = copyin((void *)args->arg, &linux_flock, 1743 sizeof(linux_flock)); 1744 if (error) 1745 return (error); 1746 linux_to_bsd_flock64(&linux_flock, &bsd_flock); 1747 return (kern_fcntl(td, args->fd, F_SETLK, 1748 (intptr_t)&bsd_flock)); 1749 1750 case LINUX_F_SETLKW64: 1751 error = copyin((void *)args->arg, &linux_flock, 1752 sizeof(linux_flock)); 1753 if (error) 1754 return (error); 1755 linux_to_bsd_flock64(&linux_flock, &bsd_flock); 1756 return (kern_fcntl(td, args->fd, F_SETLKW, 1757 (intptr_t)&bsd_flock)); 1758 } 1759 1760 fcntl_args.fd = args->fd; 1761 fcntl_args.cmd = args->cmd; 1762 fcntl_args.arg = args->arg; 1763 return (fcntl_common(td, &fcntl_args)); 1764 } 1765 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 1766 1767 #ifdef LINUX_LEGACY_SYSCALLS 1768 int 1769 linux_chown(struct thread *td, struct linux_chown_args *args) 1770 { 1771 char *path; 1772 int error; 1773 1774 if (!LUSECONVPATH(td)) { 1775 return (kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE, 1776 args->uid, args->gid, 0)); 1777 } 1778 LCONVPATHEXIST(args->path, &path); 1779 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, args->uid, 1780 args->gid, 0); 1781 LFREEPATH(path); 1782 return (error); 1783 } 1784 #endif 1785 1786 int 1787 linux_fchownat(struct thread *td, struct linux_fchownat_args *args) 1788 { 1789 char *path; 1790 int error, dfd, flag, unsupported; 1791 1792 unsupported = args->flag & ~(LINUX_AT_SYMLINK_NOFOLLOW | LINUX_AT_EMPTY_PATH); 1793 if (unsupported != 0) { 1794 linux_msg(td, "fchownat unsupported flag 0x%x", unsupported); 1795 return (EINVAL); 1796 } 1797 1798 flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) == 0 ? 0 : 1799 AT_SYMLINK_NOFOLLOW; 1800 flag |= (args->flag & LINUX_AT_EMPTY_PATH) == 0 ? 0 : 1801 AT_EMPTY_PATH; 1802 1803 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 1804 if (!LUSECONVPATH(td)) { 1805 return (kern_fchownat(td, dfd, args->filename, UIO_USERSPACE, 1806 args->uid, args->gid, flag)); 1807 } 1808 LCONVPATHEXIST_AT(args->filename, &path, dfd); 1809 error = kern_fchownat(td, dfd, path, UIO_SYSSPACE, args->uid, args->gid, 1810 flag); 1811 LFREEPATH(path); 1812 return (error); 1813 } 1814 1815 #ifdef LINUX_LEGACY_SYSCALLS 1816 int 1817 linux_lchown(struct thread *td, struct linux_lchown_args *args) 1818 { 1819 char *path; 1820 int error; 1821 1822 if (!LUSECONVPATH(td)) { 1823 return (kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE, args->uid, 1824 args->gid, AT_SYMLINK_NOFOLLOW)); 1825 } 1826 LCONVPATHEXIST(args->path, &path); 1827 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, args->uid, args->gid, 1828 AT_SYMLINK_NOFOLLOW); 1829 LFREEPATH(path); 1830 return (error); 1831 } 1832 #endif 1833 1834 static int 1835 convert_fadvice(int advice) 1836 { 1837 switch (advice) { 1838 case LINUX_POSIX_FADV_NORMAL: 1839 return (POSIX_FADV_NORMAL); 1840 case LINUX_POSIX_FADV_RANDOM: 1841 return (POSIX_FADV_RANDOM); 1842 case LINUX_POSIX_FADV_SEQUENTIAL: 1843 return (POSIX_FADV_SEQUENTIAL); 1844 case LINUX_POSIX_FADV_WILLNEED: 1845 return (POSIX_FADV_WILLNEED); 1846 case LINUX_POSIX_FADV_DONTNEED: 1847 return (POSIX_FADV_DONTNEED); 1848 case LINUX_POSIX_FADV_NOREUSE: 1849 return (POSIX_FADV_NOREUSE); 1850 default: 1851 return (-1); 1852 } 1853 } 1854 1855 int 1856 linux_fadvise64(struct thread *td, struct linux_fadvise64_args *args) 1857 { 1858 off_t offset; 1859 int advice; 1860 1861 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1862 offset = PAIR32TO64(off_t, args->offset); 1863 #else 1864 offset = args->offset; 1865 #endif 1866 1867 advice = convert_fadvice(args->advice); 1868 if (advice == -1) 1869 return (EINVAL); 1870 return (kern_posix_fadvise(td, args->fd, offset, args->len, advice)); 1871 } 1872 1873 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 1874 int 1875 linux_fadvise64_64(struct thread *td, struct linux_fadvise64_64_args *args) 1876 { 1877 off_t len, offset; 1878 int advice; 1879 1880 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1881 len = PAIR32TO64(off_t, args->len); 1882 offset = PAIR32TO64(off_t, args->offset); 1883 #else 1884 len = args->len; 1885 offset = args->offset; 1886 #endif 1887 1888 advice = convert_fadvice(args->advice); 1889 if (advice == -1) 1890 return (EINVAL); 1891 return (kern_posix_fadvise(td, args->fd, offset, len, advice)); 1892 } 1893 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 1894 1895 #ifdef LINUX_LEGACY_SYSCALLS 1896 int 1897 linux_pipe(struct thread *td, struct linux_pipe_args *args) 1898 { 1899 int fildes[2]; 1900 int error; 1901 1902 error = kern_pipe(td, fildes, 0, NULL, NULL); 1903 if (error != 0) 1904 return (error); 1905 1906 error = copyout(fildes, args->pipefds, sizeof(fildes)); 1907 if (error != 0) { 1908 (void)kern_close(td, fildes[0]); 1909 (void)kern_close(td, fildes[1]); 1910 } 1911 1912 return (error); 1913 } 1914 #endif 1915 1916 int 1917 linux_pipe2(struct thread *td, struct linux_pipe2_args *args) 1918 { 1919 int fildes[2]; 1920 int error, flags; 1921 1922 if ((args->flags & ~(LINUX_O_NONBLOCK | LINUX_O_CLOEXEC)) != 0) 1923 return (EINVAL); 1924 1925 flags = 0; 1926 if ((args->flags & LINUX_O_NONBLOCK) != 0) 1927 flags |= O_NONBLOCK; 1928 if ((args->flags & LINUX_O_CLOEXEC) != 0) 1929 flags |= O_CLOEXEC; 1930 error = kern_pipe(td, fildes, flags, NULL, NULL); 1931 if (error != 0) 1932 return (error); 1933 1934 error = copyout(fildes, args->pipefds, sizeof(fildes)); 1935 if (error != 0) { 1936 (void)kern_close(td, fildes[0]); 1937 (void)kern_close(td, fildes[1]); 1938 } 1939 1940 return (error); 1941 } 1942 1943 int 1944 linux_dup3(struct thread *td, struct linux_dup3_args *args) 1945 { 1946 int cmd; 1947 intptr_t newfd; 1948 1949 if (args->oldfd == args->newfd) 1950 return (EINVAL); 1951 if ((args->flags & ~LINUX_O_CLOEXEC) != 0) 1952 return (EINVAL); 1953 if (args->flags & LINUX_O_CLOEXEC) 1954 cmd = F_DUP2FD_CLOEXEC; 1955 else 1956 cmd = F_DUP2FD; 1957 1958 newfd = args->newfd; 1959 return (kern_fcntl(td, args->oldfd, cmd, newfd)); 1960 } 1961 1962 int 1963 linux_fallocate(struct thread *td, struct linux_fallocate_args *args) 1964 { 1965 off_t len, offset; 1966 1967 /* 1968 * We emulate only posix_fallocate system call for which 1969 * mode should be 0. 1970 */ 1971 if (args->mode != 0) 1972 return (EOPNOTSUPP); 1973 1974 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1975 len = PAIR32TO64(off_t, args->len); 1976 offset = PAIR32TO64(off_t, args->offset); 1977 #else 1978 len = args->len; 1979 offset = args->offset; 1980 #endif 1981 1982 return (kern_posix_fallocate(td, args->fd, offset, len)); 1983 } 1984 1985 int 1986 linux_copy_file_range(struct thread *td, struct linux_copy_file_range_args 1987 *args) 1988 { 1989 l_loff_t inoff, outoff, *inoffp, *outoffp; 1990 int error, flags; 1991 1992 /* 1993 * copy_file_range(2) on Linux doesn't define any flags (yet), so is 1994 * the native implementation. Enforce it. 1995 */ 1996 if (args->flags != 0) { 1997 linux_msg(td, "copy_file_range unsupported flags 0x%x", 1998 args->flags); 1999 return (EINVAL); 2000 } 2001 flags = 0; 2002 inoffp = outoffp = NULL; 2003 if (args->off_in != NULL) { 2004 error = copyin(args->off_in, &inoff, sizeof(l_loff_t)); 2005 if (error != 0) 2006 return (error); 2007 inoffp = &inoff; 2008 } 2009 if (args->off_out != NULL) { 2010 error = copyin(args->off_out, &outoff, sizeof(l_loff_t)); 2011 if (error != 0) 2012 return (error); 2013 outoffp = &outoff; 2014 } 2015 2016 error = kern_copy_file_range(td, args->fd_in, inoffp, args->fd_out, 2017 outoffp, args->len, flags); 2018 if (error == 0 && args->off_in != NULL) 2019 error = copyout(inoffp, args->off_in, sizeof(l_loff_t)); 2020 if (error == 0 && args->off_out != NULL) 2021 error = copyout(outoffp, args->off_out, sizeof(l_loff_t)); 2022 return (error); 2023 } 2024 2025 #define LINUX_MEMFD_PREFIX "memfd:" 2026 2027 int 2028 linux_memfd_create(struct thread *td, struct linux_memfd_create_args *args) 2029 { 2030 char memfd_name[LINUX_NAME_MAX + 1]; 2031 int error, flags, shmflags, oflags; 2032 2033 /* 2034 * This is our clever trick to avoid the heap allocation to copy in the 2035 * uname. We don't really need to go this far out of our way, but it 2036 * does keep the rest of this function fairly clean as they don't have 2037 * to worry about cleanup on the way out. 2038 */ 2039 error = copyinstr(args->uname_ptr, 2040 memfd_name + sizeof(LINUX_MEMFD_PREFIX) - 1, 2041 LINUX_NAME_MAX - sizeof(LINUX_MEMFD_PREFIX) - 1, NULL); 2042 if (error != 0) { 2043 if (error == ENAMETOOLONG) 2044 error = EINVAL; 2045 return (error); 2046 } 2047 2048 memcpy(memfd_name, LINUX_MEMFD_PREFIX, sizeof(LINUX_MEMFD_PREFIX) - 1); 2049 flags = linux_to_bsd_bits(args->flags, mfd_bitmap, 0); 2050 if ((flags & ~(MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_HUGETLB | 2051 MFD_HUGE_MASK)) != 0) 2052 return (EINVAL); 2053 /* Size specified but no HUGETLB. */ 2054 if ((flags & MFD_HUGE_MASK) != 0 && (flags & MFD_HUGETLB) == 0) 2055 return (EINVAL); 2056 /* We don't actually support HUGETLB. */ 2057 if ((flags & MFD_HUGETLB) != 0) 2058 return (ENOSYS); 2059 oflags = O_RDWR; 2060 shmflags = SHM_GROW_ON_WRITE; 2061 if ((flags & MFD_CLOEXEC) != 0) 2062 oflags |= O_CLOEXEC; 2063 if ((flags & MFD_ALLOW_SEALING) != 0) 2064 shmflags |= SHM_ALLOW_SEALING; 2065 return (kern_shm_open2(td, SHM_ANON, oflags, 0, shmflags, NULL, 2066 memfd_name)); 2067 } 2068 2069 int 2070 linux_splice(struct thread *td, struct linux_splice_args *args) 2071 { 2072 2073 linux_msg(td, "syscall splice not really implemented"); 2074 2075 /* 2076 * splice(2) is documented to return EINVAL in various circumstances; 2077 * returning it instead of ENOSYS should hint the caller to use fallback 2078 * instead. 2079 */ 2080 return (EINVAL); 2081 } 2082