1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/systm.h>
31 #include <sys/dirent.h>
32 #include <sys/fcntl.h>
33 #include <sys/file.h>
34 #include <sys/filedesc.h>
35 #include <sys/lock.h>
36 #include <sys/mman.h>
37 #include <sys/selinfo.h>
38 #include <sys/pipe.h>
39 #include <sys/proc.h>
40 #include <sys/stat.h>
41 #include <sys/sx.h>
42 #include <sys/syscallsubr.h>
43 #include <sys/sysproto.h>
44 #include <sys/tty.h>
45 #include <sys/unistd.h>
46 #include <sys/vnode.h>
47
48 #ifdef COMPAT_LINUX32
49 #include <compat/freebsd32/freebsd32_misc.h>
50 #include <compat/freebsd32/freebsd32_util.h>
51 #include <machine/../linux32/linux.h>
52 #include <machine/../linux32/linux32_proto.h>
53 #else
54 #include <machine/../linux/linux.h>
55 #include <machine/../linux/linux_proto.h>
56 #endif
57 #include <compat/linux/linux_misc.h>
58 #include <compat/linux/linux_util.h>
59 #include <compat/linux/linux_file.h>
60
61 static int linux_common_open(struct thread *, int, const char *, int, int,
62 enum uio_seg);
63 static int linux_do_accessat(struct thread *t, int, const char *, int, int);
64 static int linux_getdents_error(struct thread *, int, int);
65
66 static struct bsd_to_linux_bitmap seal_bitmap[] = {
67 BITMAP_1t1_LINUX(F_SEAL_SEAL),
68 BITMAP_1t1_LINUX(F_SEAL_SHRINK),
69 BITMAP_1t1_LINUX(F_SEAL_GROW),
70 BITMAP_1t1_LINUX(F_SEAL_WRITE),
71 };
72
73 #define MFD_HUGETLB_ENTRY(_size) \
74 { \
75 .bsd_value = MFD_HUGE_##_size, \
76 .linux_value = LINUX_HUGETLB_FLAG_ENCODE_##_size \
77 }
78 static struct bsd_to_linux_bitmap mfd_bitmap[] = {
79 BITMAP_1t1_LINUX(MFD_CLOEXEC),
80 BITMAP_1t1_LINUX(MFD_ALLOW_SEALING),
81 BITMAP_1t1_LINUX(MFD_HUGETLB),
82 MFD_HUGETLB_ENTRY(64KB),
83 MFD_HUGETLB_ENTRY(512KB),
84 MFD_HUGETLB_ENTRY(1MB),
85 MFD_HUGETLB_ENTRY(2MB),
86 MFD_HUGETLB_ENTRY(8MB),
87 MFD_HUGETLB_ENTRY(16MB),
88 MFD_HUGETLB_ENTRY(32MB),
89 MFD_HUGETLB_ENTRY(256MB),
90 MFD_HUGETLB_ENTRY(512MB),
91 MFD_HUGETLB_ENTRY(1GB),
92 MFD_HUGETLB_ENTRY(2GB),
93 MFD_HUGETLB_ENTRY(16GB),
94 };
95 #undef MFD_HUGETLB_ENTRY
96
97 #ifdef LINUX_LEGACY_SYSCALLS
98 int
linux_creat(struct thread * td,struct linux_creat_args * args)99 linux_creat(struct thread *td, struct linux_creat_args *args)
100 {
101
102 return (kern_openat(td, AT_FDCWD, args->path, UIO_USERSPACE,
103 O_WRONLY | O_CREAT | O_TRUNC, args->mode));
104 }
105 #endif
106
107 static int
linux_common_openflags(int l_flags)108 linux_common_openflags(int l_flags)
109 {
110 int bsd_flags;
111
112 bsd_flags = 0;
113 switch (l_flags & LINUX_O_ACCMODE) {
114 case LINUX_O_WRONLY:
115 bsd_flags |= O_WRONLY;
116 break;
117 case LINUX_O_RDWR:
118 bsd_flags |= O_RDWR;
119 break;
120 default:
121 bsd_flags |= O_RDONLY;
122 }
123 if (l_flags & LINUX_O_NDELAY)
124 bsd_flags |= O_NONBLOCK;
125 if (l_flags & LINUX_O_APPEND)
126 bsd_flags |= O_APPEND;
127 if (l_flags & LINUX_O_SYNC)
128 bsd_flags |= O_FSYNC;
129 if (l_flags & LINUX_O_CLOEXEC)
130 bsd_flags |= O_CLOEXEC;
131 if (l_flags & LINUX_O_NONBLOCK)
132 bsd_flags |= O_NONBLOCK;
133 if (l_flags & LINUX_O_ASYNC)
134 bsd_flags |= O_ASYNC;
135 if (l_flags & LINUX_O_CREAT)
136 bsd_flags |= O_CREAT;
137 if (l_flags & LINUX_O_TRUNC)
138 bsd_flags |= O_TRUNC;
139 if (l_flags & LINUX_O_EXCL)
140 bsd_flags |= O_EXCL;
141 if (l_flags & LINUX_O_NOCTTY)
142 bsd_flags |= O_NOCTTY;
143 if (l_flags & LINUX_O_DIRECT)
144 bsd_flags |= O_DIRECT;
145 if (l_flags & LINUX_O_NOFOLLOW)
146 bsd_flags |= O_NOFOLLOW;
147 if (l_flags & LINUX_O_DIRECTORY)
148 bsd_flags |= O_DIRECTORY;
149 if (l_flags & LINUX_O_PATH)
150 bsd_flags |= O_PATH;
151 /* XXX LINUX_O_NOATIME: unable to be easily implemented. */
152 return (bsd_flags);
153 }
154
155 static int
linux_common_open(struct thread * td,int dirfd,const char * path,int l_flags,int mode,enum uio_seg seg)156 linux_common_open(struct thread *td, int dirfd, const char *path, int l_flags,
157 int mode, enum uio_seg seg)
158 {
159 struct proc *p = td->td_proc;
160 struct file *fp;
161 int fd;
162 int bsd_flags, error;
163
164 bsd_flags = linux_common_openflags(l_flags);
165 error = kern_openat(td, dirfd, path, seg, bsd_flags, mode);
166 if (error != 0) {
167 if (error == EMLINK)
168 error = ELOOP;
169 goto done;
170 }
171 if (p->p_flag & P_CONTROLT)
172 goto done;
173 if (bsd_flags & O_NOCTTY)
174 goto done;
175
176 /*
177 * XXX In between kern_openat() and fget(), another process
178 * having the same filedesc could use that fd without
179 * checking below.
180 */
181 fd = td->td_retval[0];
182 if (fget(td, fd, &cap_ioctl_rights, &fp) == 0) {
183 if (fp->f_type != DTYPE_VNODE) {
184 fdrop(fp, td);
185 goto done;
186 }
187 sx_slock(&proctree_lock);
188 PROC_LOCK(p);
189 if (SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
190 PROC_UNLOCK(p);
191 sx_sunlock(&proctree_lock);
192 /* XXXPJD: Verify if TIOCSCTTY is allowed. */
193 (void) fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0,
194 td->td_ucred, td);
195 } else {
196 PROC_UNLOCK(p);
197 sx_sunlock(&proctree_lock);
198 }
199 fdrop(fp, td);
200 }
201
202 done:
203 return (error);
204 }
205
206 int
linux_openat(struct thread * td,struct linux_openat_args * args)207 linux_openat(struct thread *td, struct linux_openat_args *args)
208 {
209 int dfd;
210
211 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
212 return (linux_common_open(td, dfd, args->filename, args->flags,
213 args->mode, UIO_USERSPACE));
214 }
215
216 #ifdef LINUX_LEGACY_SYSCALLS
217 int
linux_open(struct thread * td,struct linux_open_args * args)218 linux_open(struct thread *td, struct linux_open_args *args)
219 {
220
221 return (linux_common_open(td, AT_FDCWD, args->path, args->flags,
222 args->mode, UIO_USERSPACE));
223 }
224 #endif
225
226 int
linux_name_to_handle_at(struct thread * td,struct linux_name_to_handle_at_args * args)227 linux_name_to_handle_at(struct thread *td,
228 struct linux_name_to_handle_at_args *args)
229 {
230 static const l_int valid_flags = (LINUX_AT_SYMLINK_FOLLOW |
231 LINUX_AT_EMPTY_PATH);
232 static const l_uint fh_size = sizeof(fhandle_t);
233
234 fhandle_t fh;
235 l_uint fh_bytes;
236 l_int mount_id;
237 int error, fd, bsd_flags;
238
239 if (args->flags & ~valid_flags)
240 return (EINVAL);
241
242 fd = args->dirfd;
243 if (fd == LINUX_AT_FDCWD)
244 fd = AT_FDCWD;
245
246 bsd_flags = 0;
247 if (!(args->flags & LINUX_AT_SYMLINK_FOLLOW))
248 bsd_flags |= AT_SYMLINK_NOFOLLOW;
249 if ((args->flags & LINUX_AT_EMPTY_PATH) != 0)
250 bsd_flags |= AT_EMPTY_PATH;
251
252 error = kern_getfhat(td, bsd_flags, fd, args->name,
253 UIO_USERSPACE, &fh, UIO_SYSSPACE);
254 if (error != 0)
255 return (error);
256
257 /* Emit mount_id -- required before EOVERFLOW case. */
258 mount_id = (fh.fh_fsid.val[0] ^ fh.fh_fsid.val[1]);
259 error = copyout(&mount_id, args->mnt_id, sizeof(mount_id));
260 if (error != 0)
261 return (error);
262
263 /* Check if there is room for handle. */
264 error = copyin(&args->handle->handle_bytes, &fh_bytes,
265 sizeof(fh_bytes));
266 if (error != 0)
267 return (error);
268
269 if (fh_bytes < fh_size) {
270 error = copyout(&fh_size, &args->handle->handle_bytes,
271 sizeof(fh_size));
272 if (error == 0)
273 error = EOVERFLOW;
274 return (error);
275 }
276
277 /* Emit handle. */
278 mount_id = 0;
279 /*
280 * We don't use handle_type for anything yet, but initialize a known
281 * value.
282 */
283 error = copyout(&mount_id, &args->handle->handle_type,
284 sizeof(mount_id));
285 if (error != 0)
286 return (error);
287
288 error = copyout(&fh, &args->handle->f_handle,
289 sizeof(fh));
290 return (error);
291 }
292
293 int
linux_open_by_handle_at(struct thread * td,struct linux_open_by_handle_at_args * args)294 linux_open_by_handle_at(struct thread *td,
295 struct linux_open_by_handle_at_args *args)
296 {
297 l_uint fh_bytes;
298 int bsd_flags, error;
299
300 error = copyin(&args->handle->handle_bytes, &fh_bytes,
301 sizeof(fh_bytes));
302 if (error != 0)
303 return (error);
304
305 if (fh_bytes < sizeof(fhandle_t))
306 return (EINVAL);
307
308 bsd_flags = linux_common_openflags(args->flags);
309 return (kern_fhopen(td, (void *)&args->handle->f_handle, bsd_flags));
310 }
311
312 int
linux_lseek(struct thread * td,struct linux_lseek_args * args)313 linux_lseek(struct thread *td, struct linux_lseek_args *args)
314 {
315
316 return (kern_lseek(td, args->fdes, args->off, args->whence));
317 }
318
319 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
320 int
linux_llseek(struct thread * td,struct linux_llseek_args * args)321 linux_llseek(struct thread *td, struct linux_llseek_args *args)
322 {
323 int error;
324 off_t off;
325
326 off = (args->olow) | (((off_t) args->ohigh) << 32);
327
328 error = kern_lseek(td, args->fd, off, args->whence);
329 if (error != 0)
330 return (error);
331
332 error = copyout(td->td_retval, args->res, sizeof(off_t));
333 if (error != 0)
334 return (error);
335
336 td->td_retval[0] = 0;
337 return (0);
338 }
339 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
340
341 /*
342 * Note that linux_getdents(2) and linux_getdents64(2) have the same
343 * arguments. They only differ in the definition of struct dirent they
344 * operate on.
345 * Note that linux_readdir(2) is a special case of linux_getdents(2)
346 * where count is always equals 1, meaning that the buffer is one
347 * dirent-structure in size and that the code can't handle more anyway.
348 * Note that linux_readdir(2) can't be implemented by means of linux_getdents(2)
349 * as in case when the *dent buffer size is equal to 1 linux_getdents(2) will
350 * trash user stack.
351 */
352
353 static int
linux_getdents_error(struct thread * td,int fd,int err)354 linux_getdents_error(struct thread *td, int fd, int err)
355 {
356 struct vnode *vp;
357 struct file *fp;
358 int error;
359
360 /* Linux return ENOTDIR in case when fd is not a directory. */
361 error = getvnode(td, fd, &cap_read_rights, &fp);
362 if (error != 0)
363 return (error);
364 vp = fp->f_vnode;
365 if (vp->v_type != VDIR) {
366 fdrop(fp, td);
367 return (ENOTDIR);
368 }
369 fdrop(fp, td);
370 return (err);
371 }
372
373 struct l_dirent {
374 l_ulong d_ino;
375 l_off_t d_off;
376 l_ushort d_reclen;
377 char d_name[LINUX_NAME_MAX + 1];
378 };
379
380 struct l_dirent64 {
381 uint64_t d_ino;
382 int64_t d_off;
383 l_ushort d_reclen;
384 u_char d_type;
385 char d_name[LINUX_NAME_MAX + 1];
386 };
387
388 /*
389 * Linux uses the last byte in the dirent buffer to store d_type,
390 * at least glibc-2.7 requires it. That is why l_dirent is padded with 2 bytes.
391 */
392 #define LINUX_RECLEN(namlen) \
393 roundup(offsetof(struct l_dirent, d_name) + (namlen) + 2, sizeof(l_ulong))
394
395 #define LINUX_RECLEN64(namlen) \
396 roundup(offsetof(struct l_dirent64, d_name) + (namlen) + 1, \
397 sizeof(uint64_t))
398
399 #ifdef LINUX_LEGACY_SYSCALLS
400 int
linux_getdents(struct thread * td,struct linux_getdents_args * args)401 linux_getdents(struct thread *td, struct linux_getdents_args *args)
402 {
403 struct dirent *bdp;
404 caddr_t inp, buf; /* BSD-format */
405 int len, reclen; /* BSD-format */
406 caddr_t outp; /* Linux-format */
407 int resid, linuxreclen; /* Linux-format */
408 caddr_t lbuf; /* Linux-format */
409 off_t base;
410 struct l_dirent *linux_dirent;
411 int buflen, error;
412 size_t retval;
413
414 buflen = min(args->count, MAXBSIZE);
415 buf = malloc(buflen, M_LINUX, M_WAITOK);
416
417 error = kern_getdirentries(td, args->fd, buf, buflen,
418 &base, NULL, UIO_SYSSPACE);
419 if (error != 0) {
420 error = linux_getdents_error(td, args->fd, error);
421 goto out1;
422 }
423
424 lbuf = malloc(LINUX_RECLEN(LINUX_NAME_MAX), M_LINUX, M_WAITOK | M_ZERO);
425
426 len = td->td_retval[0];
427 inp = buf;
428 outp = (caddr_t)args->dent;
429 resid = args->count;
430 retval = 0;
431
432 while (len > 0) {
433 bdp = (struct dirent *) inp;
434 reclen = bdp->d_reclen;
435 linuxreclen = LINUX_RECLEN(bdp->d_namlen);
436 /*
437 * No more space in the user supplied dirent buffer.
438 * Return EINVAL.
439 */
440 if (resid < linuxreclen) {
441 error = EINVAL;
442 goto out;
443 }
444
445 linux_dirent = (struct l_dirent*)lbuf;
446 linux_dirent->d_ino = bdp->d_fileno;
447 linux_dirent->d_off = bdp->d_off;
448 linux_dirent->d_reclen = linuxreclen;
449 /*
450 * Copy d_type to last byte of l_dirent buffer
451 */
452 lbuf[linuxreclen - 1] = bdp->d_type;
453 strlcpy(linux_dirent->d_name, bdp->d_name,
454 linuxreclen - offsetof(struct l_dirent, d_name)-1);
455 error = copyout(linux_dirent, outp, linuxreclen);
456 if (error != 0)
457 goto out;
458
459 inp += reclen;
460 base += reclen;
461 len -= reclen;
462
463 retval += linuxreclen;
464 outp += linuxreclen;
465 resid -= linuxreclen;
466 }
467 td->td_retval[0] = retval;
468
469 out:
470 free(lbuf, M_LINUX);
471 out1:
472 free(buf, M_LINUX);
473 return (error);
474 }
475 #endif
476
477 int
linux_getdents64(struct thread * td,struct linux_getdents64_args * args)478 linux_getdents64(struct thread *td, struct linux_getdents64_args *args)
479 {
480 struct dirent *bdp;
481 caddr_t inp, buf; /* BSD-format */
482 int len, reclen; /* BSD-format */
483 caddr_t outp; /* Linux-format */
484 int resid, linuxreclen; /* Linux-format */
485 off_t base;
486 struct l_dirent64 *linux_dirent64;
487 int buflen, error;
488 size_t retval;
489
490 buflen = min(args->count, MAXBSIZE);
491 buf = malloc(buflen, M_LINUX, M_WAITOK);
492
493 error = kern_getdirentries(td, args->fd, buf, buflen,
494 &base, NULL, UIO_SYSSPACE);
495 if (error != 0) {
496 error = linux_getdents_error(td, args->fd, error);
497 goto out1;
498 }
499
500 linux_dirent64 = malloc(LINUX_RECLEN64(LINUX_NAME_MAX), M_LINUX,
501 M_WAITOK | M_ZERO);
502
503 len = td->td_retval[0];
504 inp = buf;
505 outp = (caddr_t)args->dirent;
506 resid = args->count;
507 retval = 0;
508
509 while (len > 0) {
510 bdp = (struct dirent *) inp;
511 reclen = bdp->d_reclen;
512 linuxreclen = LINUX_RECLEN64(bdp->d_namlen);
513 /*
514 * No more space in the user supplied dirent buffer.
515 * Return EINVAL.
516 */
517 if (resid < linuxreclen) {
518 error = EINVAL;
519 goto out;
520 }
521
522 linux_dirent64->d_ino = bdp->d_fileno;
523 linux_dirent64->d_off = bdp->d_off;
524 linux_dirent64->d_reclen = linuxreclen;
525 linux_dirent64->d_type = bdp->d_type;
526 strlcpy(linux_dirent64->d_name, bdp->d_name,
527 linuxreclen - offsetof(struct l_dirent64, d_name));
528 error = copyout(linux_dirent64, outp, linuxreclen);
529 if (error != 0)
530 goto out;
531
532 inp += reclen;
533 base += reclen;
534 len -= reclen;
535
536 retval += linuxreclen;
537 outp += linuxreclen;
538 resid -= linuxreclen;
539 }
540 td->td_retval[0] = retval;
541
542 out:
543 free(linux_dirent64, M_LINUX);
544 out1:
545 free(buf, M_LINUX);
546 return (error);
547 }
548
549 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
550 int
linux_readdir(struct thread * td,struct linux_readdir_args * args)551 linux_readdir(struct thread *td, struct linux_readdir_args *args)
552 {
553 struct dirent *bdp;
554 caddr_t buf; /* BSD-format */
555 int linuxreclen; /* Linux-format */
556 off_t base;
557 struct l_dirent *linux_dirent; /* Linux-format */
558 int buflen, error;
559
560 buflen = sizeof(*bdp);
561 buf = malloc(buflen, M_LINUX, M_WAITOK);
562
563 error = kern_getdirentries(td, args->fd, buf, buflen,
564 &base, NULL, UIO_SYSSPACE);
565 if (error != 0) {
566 error = linux_getdents_error(td, args->fd, error);
567 goto out;
568 }
569 if (td->td_retval[0] == 0)
570 goto out;
571
572 linux_dirent = malloc(LINUX_RECLEN(LINUX_NAME_MAX), M_LINUX,
573 M_WAITOK | M_ZERO);
574
575 bdp = (struct dirent *) buf;
576 linuxreclen = LINUX_RECLEN(bdp->d_namlen);
577
578 linux_dirent->d_ino = bdp->d_fileno;
579 linux_dirent->d_off = bdp->d_off;
580 linux_dirent->d_reclen = bdp->d_namlen;
581 strlcpy(linux_dirent->d_name, bdp->d_name,
582 linuxreclen - offsetof(struct l_dirent, d_name));
583 error = copyout(linux_dirent, args->dent, linuxreclen);
584 if (error == 0)
585 td->td_retval[0] = linuxreclen;
586
587 free(linux_dirent, M_LINUX);
588 out:
589 free(buf, M_LINUX);
590 return (error);
591 }
592 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
593
594 /*
595 * These exist mainly for hooks for doing /compat/linux translation.
596 */
597
598 #ifdef LINUX_LEGACY_SYSCALLS
599 int
linux_access(struct thread * td,struct linux_access_args * args)600 linux_access(struct thread *td, struct linux_access_args *args)
601 {
602
603 /* Linux convention. */
604 if (args->amode & ~(F_OK | X_OK | W_OK | R_OK))
605 return (EINVAL);
606
607 return (kern_accessat(td, AT_FDCWD, args->path, UIO_USERSPACE, 0,
608 args->amode));
609 }
610 #endif
611
612 static int
linux_do_accessat(struct thread * td,int ldfd,const char * filename,int amode,int flags)613 linux_do_accessat(struct thread *td, int ldfd, const char *filename,
614 int amode, int flags)
615 {
616 int dfd;
617
618 /* Linux convention. */
619 if (amode & ~(F_OK | X_OK | W_OK | R_OK))
620 return (EINVAL);
621
622 dfd = (ldfd == LINUX_AT_FDCWD) ? AT_FDCWD : ldfd;
623 return (kern_accessat(td, dfd, filename, UIO_USERSPACE, flags, amode));
624 }
625
626 int
linux_faccessat(struct thread * td,struct linux_faccessat_args * args)627 linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
628 {
629
630 return (linux_do_accessat(td, args->dfd, args->filename, args->amode,
631 0));
632 }
633
634 int
linux_faccessat2(struct thread * td,struct linux_faccessat2_args * args)635 linux_faccessat2(struct thread *td, struct linux_faccessat2_args *args)
636 {
637 int flags, unsupported;
638
639 /* XXX. AT_SYMLINK_NOFOLLOW is not supported by kern_accessat */
640 unsupported = args->flags & ~(LINUX_AT_EACCESS | LINUX_AT_EMPTY_PATH);
641 if (unsupported != 0) {
642 linux_msg(td, "faccessat2 unsupported flag 0x%x", unsupported);
643 return (EINVAL);
644 }
645
646 flags = (args->flags & LINUX_AT_EACCESS) == 0 ? 0 :
647 AT_EACCESS;
648 flags |= (args->flags & LINUX_AT_EMPTY_PATH) == 0 ? 0 :
649 AT_EMPTY_PATH;
650 return (linux_do_accessat(td, args->dfd, args->filename, args->amode,
651 flags));
652 }
653
654
655 #ifdef LINUX_LEGACY_SYSCALLS
656 int
linux_unlink(struct thread * td,struct linux_unlink_args * args)657 linux_unlink(struct thread *td, struct linux_unlink_args *args)
658 {
659 int error;
660 struct stat st;
661
662 error = kern_funlinkat(td, AT_FDCWD, args->path, FD_NONE,
663 UIO_USERSPACE, 0, 0);
664 if (error == EPERM) {
665 /* Introduce POSIX noncompliant behaviour of Linux */
666 if (kern_statat(td, 0, AT_FDCWD, args->path,
667 UIO_USERSPACE, &st) == 0) {
668 if (S_ISDIR(st.st_mode))
669 error = EISDIR;
670 }
671 }
672
673 return (error);
674 }
675 #endif
676
677 static int
linux_unlinkat_impl(struct thread * td,enum uio_seg pathseg,const char * path,int dfd,struct linux_unlinkat_args * args)678 linux_unlinkat_impl(struct thread *td, enum uio_seg pathseg, const char *path,
679 int dfd, struct linux_unlinkat_args *args)
680 {
681 struct stat st;
682 int error;
683
684 if (args->flag & LINUX_AT_REMOVEDIR)
685 error = kern_frmdirat(td, dfd, path, FD_NONE, pathseg, 0);
686 else
687 error = kern_funlinkat(td, dfd, path, FD_NONE, pathseg, 0, 0);
688 if (error == EPERM && !(args->flag & LINUX_AT_REMOVEDIR)) {
689 /* Introduce POSIX noncompliant behaviour of Linux */
690 if (kern_statat(td, AT_SYMLINK_NOFOLLOW, dfd, path,
691 pathseg, &st) == 0 && S_ISDIR(st.st_mode))
692 error = EISDIR;
693 }
694 return (error);
695 }
696
697 int
linux_unlinkat(struct thread * td,struct linux_unlinkat_args * args)698 linux_unlinkat(struct thread *td, struct linux_unlinkat_args *args)
699 {
700 int dfd;
701
702 if (args->flag & ~LINUX_AT_REMOVEDIR)
703 return (EINVAL);
704 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
705 return (linux_unlinkat_impl(td, UIO_USERSPACE, args->pathname,
706 dfd, args));
707 }
708
709 int
linux_chdir(struct thread * td,struct linux_chdir_args * args)710 linux_chdir(struct thread *td, struct linux_chdir_args *args)
711 {
712
713 return (kern_chdir(td, args->path, UIO_USERSPACE));
714 }
715
716 #ifdef LINUX_LEGACY_SYSCALLS
717 int
linux_chmod(struct thread * td,struct linux_chmod_args * args)718 linux_chmod(struct thread *td, struct linux_chmod_args *args)
719 {
720
721 return (kern_fchmodat(td, AT_FDCWD, args->path, UIO_USERSPACE,
722 args->mode, 0));
723 }
724 #endif
725
726 int
linux_fchmodat(struct thread * td,struct linux_fchmodat_args * args)727 linux_fchmodat(struct thread *td, struct linux_fchmodat_args *args)
728 {
729 int dfd;
730
731 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
732 return (kern_fchmodat(td, dfd, args->filename, UIO_USERSPACE,
733 args->mode, 0));
734 }
735
736 #ifdef LINUX_LEGACY_SYSCALLS
737 int
linux_mkdir(struct thread * td,struct linux_mkdir_args * args)738 linux_mkdir(struct thread *td, struct linux_mkdir_args *args)
739 {
740
741 return (kern_mkdirat(td, AT_FDCWD, args->path, UIO_USERSPACE, args->mode));
742 }
743 #endif
744
745 int
linux_mkdirat(struct thread * td,struct linux_mkdirat_args * args)746 linux_mkdirat(struct thread *td, struct linux_mkdirat_args *args)
747 {
748 int dfd;
749
750 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
751 return (kern_mkdirat(td, dfd, args->pathname, UIO_USERSPACE, args->mode));
752 }
753
754 #ifdef LINUX_LEGACY_SYSCALLS
755 int
linux_rmdir(struct thread * td,struct linux_rmdir_args * args)756 linux_rmdir(struct thread *td, struct linux_rmdir_args *args)
757 {
758
759 return (kern_frmdirat(td, AT_FDCWD, args->path, FD_NONE,
760 UIO_USERSPACE, 0));
761 }
762
763 int
linux_rename(struct thread * td,struct linux_rename_args * args)764 linux_rename(struct thread *td, struct linux_rename_args *args)
765 {
766
767 return (kern_renameat(td, AT_FDCWD, args->from, AT_FDCWD,
768 args->to, UIO_USERSPACE));
769 }
770 #endif
771
772 int
linux_renameat(struct thread * td,struct linux_renameat_args * args)773 linux_renameat(struct thread *td, struct linux_renameat_args *args)
774 {
775 struct linux_renameat2_args renameat2_args = {
776 .olddfd = args->olddfd,
777 .oldname = args->oldname,
778 .newdfd = args->newdfd,
779 .newname = args->newname,
780 .flags = 0
781 };
782
783 return (linux_renameat2(td, &renameat2_args));
784 }
785
786 int
linux_renameat2(struct thread * td,struct linux_renameat2_args * args)787 linux_renameat2(struct thread *td, struct linux_renameat2_args *args)
788 {
789 int olddfd, newdfd;
790
791 if (args->flags != 0) {
792 if (args->flags & ~(LINUX_RENAME_EXCHANGE |
793 LINUX_RENAME_NOREPLACE | LINUX_RENAME_WHITEOUT))
794 return (EINVAL);
795 if (args->flags & LINUX_RENAME_EXCHANGE &&
796 args->flags & (LINUX_RENAME_NOREPLACE |
797 LINUX_RENAME_WHITEOUT))
798 return (EINVAL);
799 #if 0
800 /*
801 * This spams the console on Ubuntu Focal.
802 *
803 * What's needed here is a general mechanism to let users know
804 * about missing features without hogging the system.
805 */
806 linux_msg(td, "renameat2 unsupported flags 0x%x",
807 args->flags);
808 #endif
809 return (EINVAL);
810 }
811
812 olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
813 newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
814 return (kern_renameat(td, olddfd, args->oldname, newdfd,
815 args->newname, UIO_USERSPACE));
816 }
817
818 #ifdef LINUX_LEGACY_SYSCALLS
819 int
linux_symlink(struct thread * td,struct linux_symlink_args * args)820 linux_symlink(struct thread *td, struct linux_symlink_args *args)
821 {
822
823 return (kern_symlinkat(td, args->path, AT_FDCWD, args->to,
824 UIO_USERSPACE));
825 }
826 #endif
827
828 int
linux_symlinkat(struct thread * td,struct linux_symlinkat_args * args)829 linux_symlinkat(struct thread *td, struct linux_symlinkat_args *args)
830 {
831 int dfd;
832
833 dfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
834 return (kern_symlinkat(td, args->oldname, dfd, args->newname,
835 UIO_USERSPACE));
836 }
837
838 #ifdef LINUX_LEGACY_SYSCALLS
839 int
linux_readlink(struct thread * td,struct linux_readlink_args * args)840 linux_readlink(struct thread *td, struct linux_readlink_args *args)
841 {
842
843 if (args->count <= 0)
844 return (EINVAL);
845
846 return (kern_readlinkat(td, AT_FDCWD, args->name, UIO_USERSPACE,
847 args->buf, UIO_USERSPACE, args->count));
848 }
849 #endif
850
851 int
linux_readlinkat(struct thread * td,struct linux_readlinkat_args * args)852 linux_readlinkat(struct thread *td, struct linux_readlinkat_args *args)
853 {
854 int dfd;
855
856 if (args->bufsiz <= 0)
857 return (EINVAL);
858
859 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
860 return (kern_readlinkat(td, dfd, args->path, UIO_USERSPACE,
861 args->buf, UIO_USERSPACE, args->bufsiz));
862 }
863
864 int
linux_truncate(struct thread * td,struct linux_truncate_args * args)865 linux_truncate(struct thread *td, struct linux_truncate_args *args)
866 {
867
868 return (kern_truncate(td, args->path, UIO_USERSPACE, args->length));
869 }
870
871 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
872 int
linux_truncate64(struct thread * td,struct linux_truncate64_args * args)873 linux_truncate64(struct thread *td, struct linux_truncate64_args *args)
874 {
875 off_t length;
876
877 #if defined(__amd64__) && defined(COMPAT_LINUX32)
878 length = PAIR32TO64(off_t, args->length);
879 #else
880 length = args->length;
881 #endif
882
883 return (kern_truncate(td, args->path, UIO_USERSPACE, length));
884 }
885 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
886
887 int
linux_ftruncate(struct thread * td,struct linux_ftruncate_args * args)888 linux_ftruncate(struct thread *td, struct linux_ftruncate_args *args)
889 {
890
891 return (kern_ftruncate(td, args->fd, args->length));
892 }
893
894 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
895 int
linux_ftruncate64(struct thread * td,struct linux_ftruncate64_args * args)896 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
897 {
898 off_t length;
899
900 #if defined(__amd64__) && defined(COMPAT_LINUX32)
901 length = PAIR32TO64(off_t, args->length);
902 #else
903 length = args->length;
904 #endif
905
906 return (kern_ftruncate(td, args->fd, length));
907 }
908 #endif
909
910 #ifdef LINUX_LEGACY_SYSCALLS
911 int
linux_link(struct thread * td,struct linux_link_args * args)912 linux_link(struct thread *td, struct linux_link_args *args)
913 {
914
915 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, args->path, args->to,
916 UIO_USERSPACE, AT_SYMLINK_FOLLOW));
917 }
918 #endif
919
920 int
linux_linkat(struct thread * td,struct linux_linkat_args * args)921 linux_linkat(struct thread *td, struct linux_linkat_args *args)
922 {
923 int olddfd, newdfd, flag;
924
925 if (args->flag & ~(LINUX_AT_SYMLINK_FOLLOW | LINUX_AT_EMPTY_PATH))
926 return (EINVAL);
927
928 flag = (args->flag & LINUX_AT_SYMLINK_FOLLOW) != 0 ? AT_SYMLINK_FOLLOW :
929 0;
930 flag |= (args->flag & LINUX_AT_EMPTY_PATH) != 0 ? AT_EMPTY_PATH : 0;
931
932 olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
933 newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
934 return (kern_linkat(td, olddfd, newdfd, args->oldname,
935 args->newname, UIO_USERSPACE, flag));
936 }
937
938 int
linux_fdatasync(struct thread * td,struct linux_fdatasync_args * uap)939 linux_fdatasync(struct thread *td, struct linux_fdatasync_args *uap)
940 {
941
942 return (kern_fsync(td, uap->fd, false));
943 }
944
945 int
linux_sync_file_range(struct thread * td,struct linux_sync_file_range_args * uap)946 linux_sync_file_range(struct thread *td, struct linux_sync_file_range_args *uap)
947 {
948 off_t nbytes, offset;
949
950 #if defined(__amd64__) && defined(COMPAT_LINUX32)
951 nbytes = PAIR32TO64(off_t, uap->nbytes);
952 offset = PAIR32TO64(off_t, uap->offset);
953 #else
954 nbytes = uap->nbytes;
955 offset = uap->offset;
956 #endif
957
958 if (offset < 0 || nbytes < 0 ||
959 (uap->flags & ~(LINUX_SYNC_FILE_RANGE_WAIT_BEFORE |
960 LINUX_SYNC_FILE_RANGE_WRITE |
961 LINUX_SYNC_FILE_RANGE_WAIT_AFTER)) != 0) {
962 return (EINVAL);
963 }
964
965 return (kern_fsync(td, uap->fd, false));
966 }
967
968 int
linux_pread(struct thread * td,struct linux_pread_args * uap)969 linux_pread(struct thread *td, struct linux_pread_args *uap)
970 {
971 struct vnode *vp;
972 off_t offset;
973 int error;
974
975 #if defined(__amd64__) && defined(COMPAT_LINUX32)
976 offset = PAIR32TO64(off_t, uap->offset);
977 #else
978 offset = uap->offset;
979 #endif
980
981 error = kern_pread(td, uap->fd, uap->buf, uap->nbyte, offset);
982 if (error == 0) {
983 /* This seems to violate POSIX but Linux does it. */
984 error = fgetvp(td, uap->fd, &cap_pread_rights, &vp);
985 if (error != 0)
986 return (error);
987 if (vp->v_type == VDIR)
988 error = EISDIR;
989 vrele(vp);
990 }
991 return (error);
992 }
993
994 int
linux_pwrite(struct thread * td,struct linux_pwrite_args * uap)995 linux_pwrite(struct thread *td, struct linux_pwrite_args *uap)
996 {
997 off_t offset;
998
999 #if defined(__amd64__) && defined(COMPAT_LINUX32)
1000 offset = PAIR32TO64(off_t, uap->offset);
1001 #else
1002 offset = uap->offset;
1003 #endif
1004
1005 return (linux_enobufs2eagain(td, uap->fd,
1006 kern_pwrite(td, uap->fd, uap->buf, uap->nbyte, offset)));
1007 }
1008
1009 #define HALF_LONG_BITS ((sizeof(l_long) * NBBY / 2))
1010
1011 static inline off_t
pos_from_hilo(unsigned long high,unsigned long low)1012 pos_from_hilo(unsigned long high, unsigned long low)
1013 {
1014
1015 return (((off_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low;
1016 }
1017
1018 int
linux_preadv(struct thread * td,struct linux_preadv_args * uap)1019 linux_preadv(struct thread *td, struct linux_preadv_args *uap)
1020 {
1021 struct uio *auio;
1022 int error;
1023 off_t offset;
1024
1025 /*
1026 * According http://man7.org/linux/man-pages/man2/preadv.2.html#NOTES
1027 * pos_l and pos_h, respectively, contain the
1028 * low order and high order 32 bits of offset.
1029 */
1030 offset = pos_from_hilo(uap->pos_h, uap->pos_l);
1031 if (offset < 0)
1032 return (EINVAL);
1033 #ifdef COMPAT_LINUX32
1034 error = freebsd32_copyinuio(PTRIN(uap->vec), uap->vlen, &auio);
1035 #else
1036 error = copyinuio(uap->vec, uap->vlen, &auio);
1037 #endif
1038 if (error != 0)
1039 return (error);
1040 error = kern_preadv(td, uap->fd, auio, offset);
1041 freeuio(auio);
1042 return (error);
1043 }
1044
1045 int
linux_pwritev(struct thread * td,struct linux_pwritev_args * uap)1046 linux_pwritev(struct thread *td, struct linux_pwritev_args *uap)
1047 {
1048 struct uio *auio;
1049 int error;
1050 off_t offset;
1051
1052 /*
1053 * According http://man7.org/linux/man-pages/man2/pwritev.2.html#NOTES
1054 * pos_l and pos_h, respectively, contain the
1055 * low order and high order 32 bits of offset.
1056 */
1057 offset = pos_from_hilo(uap->pos_h, uap->pos_l);
1058 if (offset < 0)
1059 return (EINVAL);
1060 #ifdef COMPAT_LINUX32
1061 error = freebsd32_copyinuio(PTRIN(uap->vec), uap->vlen, &auio);
1062 #else
1063 error = copyinuio(uap->vec, uap->vlen, &auio);
1064 #endif
1065 if (error != 0)
1066 return (error);
1067 error = kern_pwritev(td, uap->fd, auio, offset);
1068 freeuio(auio);
1069 return (linux_enobufs2eagain(td, uap->fd, error));
1070 }
1071
1072 int
linux_mount(struct thread * td,struct linux_mount_args * args)1073 linux_mount(struct thread *td, struct linux_mount_args *args)
1074 {
1075 struct mntarg *ma = NULL;
1076 char *fstypename, *mntonname, *mntfromname, *data;
1077 int error, fsflags;
1078
1079 fstypename = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1080 mntonname = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1081 mntfromname = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1082 data = NULL;
1083 error = copyinstr(args->filesystemtype, fstypename, MNAMELEN - 1,
1084 NULL);
1085 if (error != 0)
1086 goto out;
1087 if (args->specialfile != NULL) {
1088 error = copyinstr(args->specialfile, mntfromname, MNAMELEN - 1, NULL);
1089 if (error != 0)
1090 goto out;
1091 } else {
1092 mntfromname[0] = '\0';
1093 }
1094 error = copyinstr(args->dir, mntonname, MNAMELEN - 1, NULL);
1095 if (error != 0)
1096 goto out;
1097
1098 if (strcmp(fstypename, "ext2") == 0) {
1099 strcpy(fstypename, "ext2fs");
1100 } else if (strcmp(fstypename, "proc") == 0) {
1101 strcpy(fstypename, "linprocfs");
1102 } else if (strcmp(fstypename, "vfat") == 0) {
1103 strcpy(fstypename, "msdosfs");
1104 } else if (strcmp(fstypename, "fuse") == 0 ||
1105 strncmp(fstypename, "fuse.", 5) == 0) {
1106 char *fuse_options, *fuse_option, *fuse_name;
1107
1108 strcpy(mntfromname, "/dev/fuse");
1109 strcpy(fstypename, "fusefs");
1110 data = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1111 error = copyinstr(args->data, data, MNAMELEN - 1, NULL);
1112 if (error != 0)
1113 goto out;
1114
1115 fuse_options = data;
1116 while ((fuse_option = strsep(&fuse_options, ",")) != NULL) {
1117 fuse_name = strsep(&fuse_option, "=");
1118 if (fuse_name == NULL || fuse_option == NULL)
1119 goto out;
1120 ma = mount_arg(ma, fuse_name, fuse_option, -1);
1121 }
1122
1123 /*
1124 * The FUSE server uses Linux errno values instead of FreeBSD
1125 * ones; add a flag to tell fuse(4) to do errno translation.
1126 */
1127 ma = mount_arg(ma, "linux_errnos", "1", -1);
1128 }
1129
1130 fsflags = 0;
1131
1132 /*
1133 * Linux SYNC flag is not included; the closest equivalent
1134 * FreeBSD has is !ASYNC, which is our default.
1135 */
1136 if (args->rwflag & LINUX_MS_RDONLY)
1137 fsflags |= MNT_RDONLY;
1138 if (args->rwflag & LINUX_MS_NOSUID)
1139 fsflags |= MNT_NOSUID;
1140 if (args->rwflag & LINUX_MS_NOEXEC)
1141 fsflags |= MNT_NOEXEC;
1142 if (args->rwflag & LINUX_MS_REMOUNT)
1143 fsflags |= MNT_UPDATE;
1144
1145 ma = mount_arg(ma, "fstype", fstypename, -1);
1146 ma = mount_arg(ma, "fspath", mntonname, -1);
1147 ma = mount_arg(ma, "from", mntfromname, -1);
1148 error = kernel_mount(ma, fsflags);
1149 out:
1150 free(fstypename, M_TEMP);
1151 free(mntonname, M_TEMP);
1152 free(mntfromname, M_TEMP);
1153 free(data, M_TEMP);
1154 return (error);
1155 }
1156
1157 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
1158 int
linux_oldumount(struct thread * td,struct linux_oldumount_args * args)1159 linux_oldumount(struct thread *td, struct linux_oldumount_args *args)
1160 {
1161
1162 return (kern_unmount(td, args->path, 0));
1163 }
1164 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
1165
1166 #ifdef LINUX_LEGACY_SYSCALLS
1167 int
linux_umount(struct thread * td,struct linux_umount_args * args)1168 linux_umount(struct thread *td, struct linux_umount_args *args)
1169 {
1170 int flags;
1171
1172 flags = 0;
1173 if ((args->flags & LINUX_MNT_FORCE) != 0) {
1174 args->flags &= ~LINUX_MNT_FORCE;
1175 flags |= MNT_FORCE;
1176 }
1177 if (args->flags != 0) {
1178 linux_msg(td, "unsupported umount2 flags %#x", args->flags);
1179 return (EINVAL);
1180 }
1181
1182 return (kern_unmount(td, args->path, flags));
1183 }
1184 #endif
1185
1186 /*
1187 * fcntl family of syscalls
1188 */
1189
1190 struct l_flock {
1191 l_short l_type;
1192 l_short l_whence;
1193 l_off_t l_start;
1194 l_off_t l_len;
1195 l_pid_t l_pid;
1196 }
1197 #if defined(__amd64__) && defined(COMPAT_LINUX32)
1198 __packed
1199 #endif
1200 ;
1201
1202 static void
linux_to_bsd_flock(struct l_flock * linux_flock,struct flock * bsd_flock)1203 linux_to_bsd_flock(struct l_flock *linux_flock, struct flock *bsd_flock)
1204 {
1205 switch (linux_flock->l_type) {
1206 case LINUX_F_RDLCK:
1207 bsd_flock->l_type = F_RDLCK;
1208 break;
1209 case LINUX_F_WRLCK:
1210 bsd_flock->l_type = F_WRLCK;
1211 break;
1212 case LINUX_F_UNLCK:
1213 bsd_flock->l_type = F_UNLCK;
1214 break;
1215 default:
1216 bsd_flock->l_type = -1;
1217 break;
1218 }
1219 bsd_flock->l_whence = linux_flock->l_whence;
1220 bsd_flock->l_start = (off_t)linux_flock->l_start;
1221 bsd_flock->l_len = (off_t)linux_flock->l_len;
1222 bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
1223 bsd_flock->l_sysid = 0;
1224 }
1225
1226 static void
bsd_to_linux_flock(struct flock * bsd_flock,struct l_flock * linux_flock)1227 bsd_to_linux_flock(struct flock *bsd_flock, struct l_flock *linux_flock)
1228 {
1229 switch (bsd_flock->l_type) {
1230 case F_RDLCK:
1231 linux_flock->l_type = LINUX_F_RDLCK;
1232 break;
1233 case F_WRLCK:
1234 linux_flock->l_type = LINUX_F_WRLCK;
1235 break;
1236 case F_UNLCK:
1237 linux_flock->l_type = LINUX_F_UNLCK;
1238 break;
1239 }
1240 linux_flock->l_whence = bsd_flock->l_whence;
1241 linux_flock->l_start = (l_off_t)bsd_flock->l_start;
1242 linux_flock->l_len = (l_off_t)bsd_flock->l_len;
1243 linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
1244 }
1245
1246 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
1247 struct l_flock64 {
1248 l_short l_type;
1249 l_short l_whence;
1250 l_loff_t l_start;
1251 l_loff_t l_len;
1252 l_pid_t l_pid;
1253 }
1254 #if defined(__amd64__) && defined(COMPAT_LINUX32)
1255 __packed
1256 #endif
1257 ;
1258
1259 static void
linux_to_bsd_flock64(struct l_flock64 * linux_flock,struct flock * bsd_flock)1260 linux_to_bsd_flock64(struct l_flock64 *linux_flock, struct flock *bsd_flock)
1261 {
1262 switch (linux_flock->l_type) {
1263 case LINUX_F_RDLCK:
1264 bsd_flock->l_type = F_RDLCK;
1265 break;
1266 case LINUX_F_WRLCK:
1267 bsd_flock->l_type = F_WRLCK;
1268 break;
1269 case LINUX_F_UNLCK:
1270 bsd_flock->l_type = F_UNLCK;
1271 break;
1272 default:
1273 bsd_flock->l_type = -1;
1274 break;
1275 }
1276 bsd_flock->l_whence = linux_flock->l_whence;
1277 bsd_flock->l_start = (off_t)linux_flock->l_start;
1278 bsd_flock->l_len = (off_t)linux_flock->l_len;
1279 bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
1280 bsd_flock->l_sysid = 0;
1281 }
1282
1283 static void
bsd_to_linux_flock64(struct flock * bsd_flock,struct l_flock64 * linux_flock)1284 bsd_to_linux_flock64(struct flock *bsd_flock, struct l_flock64 *linux_flock)
1285 {
1286 switch (bsd_flock->l_type) {
1287 case F_RDLCK:
1288 linux_flock->l_type = LINUX_F_RDLCK;
1289 break;
1290 case F_WRLCK:
1291 linux_flock->l_type = LINUX_F_WRLCK;
1292 break;
1293 case F_UNLCK:
1294 linux_flock->l_type = LINUX_F_UNLCK;
1295 break;
1296 }
1297 linux_flock->l_whence = bsd_flock->l_whence;
1298 linux_flock->l_start = (l_loff_t)bsd_flock->l_start;
1299 linux_flock->l_len = (l_loff_t)bsd_flock->l_len;
1300 linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
1301 }
1302 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
1303
1304 static int
fcntl_common(struct thread * td,struct linux_fcntl_args * args)1305 fcntl_common(struct thread *td, struct linux_fcntl_args *args)
1306 {
1307 struct l_flock linux_flock;
1308 struct flock bsd_flock;
1309 struct pipe *fpipe;
1310 struct file *fp;
1311 long arg;
1312 int error, result;
1313
1314 switch (args->cmd) {
1315 case LINUX_F_DUPFD:
1316 return (kern_fcntl(td, args->fd, F_DUPFD, args->arg));
1317
1318 case LINUX_F_GETFD:
1319 return (kern_fcntl(td, args->fd, F_GETFD, 0));
1320
1321 case LINUX_F_SETFD:
1322 return (kern_fcntl(td, args->fd, F_SETFD, args->arg));
1323
1324 case LINUX_F_GETFL:
1325 error = kern_fcntl(td, args->fd, F_GETFL, 0);
1326 result = td->td_retval[0];
1327 td->td_retval[0] = 0;
1328 if (result & O_RDONLY)
1329 td->td_retval[0] |= LINUX_O_RDONLY;
1330 if (result & O_WRONLY)
1331 td->td_retval[0] |= LINUX_O_WRONLY;
1332 if (result & O_RDWR)
1333 td->td_retval[0] |= LINUX_O_RDWR;
1334 if (result & O_NDELAY)
1335 td->td_retval[0] |= LINUX_O_NONBLOCK;
1336 if (result & O_APPEND)
1337 td->td_retval[0] |= LINUX_O_APPEND;
1338 if (result & O_FSYNC)
1339 td->td_retval[0] |= LINUX_O_SYNC;
1340 if (result & O_ASYNC)
1341 td->td_retval[0] |= LINUX_O_ASYNC;
1342 #ifdef LINUX_O_NOFOLLOW
1343 if (result & O_NOFOLLOW)
1344 td->td_retval[0] |= LINUX_O_NOFOLLOW;
1345 #endif
1346 #ifdef LINUX_O_DIRECT
1347 if (result & O_DIRECT)
1348 td->td_retval[0] |= LINUX_O_DIRECT;
1349 #endif
1350 return (error);
1351
1352 case LINUX_F_SETFL:
1353 arg = 0;
1354 if (args->arg & LINUX_O_NDELAY)
1355 arg |= O_NONBLOCK;
1356 if (args->arg & LINUX_O_APPEND)
1357 arg |= O_APPEND;
1358 if (args->arg & LINUX_O_SYNC)
1359 arg |= O_FSYNC;
1360 if (args->arg & LINUX_O_ASYNC)
1361 arg |= O_ASYNC;
1362 #ifdef LINUX_O_NOFOLLOW
1363 if (args->arg & LINUX_O_NOFOLLOW)
1364 arg |= O_NOFOLLOW;
1365 #endif
1366 #ifdef LINUX_O_DIRECT
1367 if (args->arg & LINUX_O_DIRECT)
1368 arg |= O_DIRECT;
1369 #endif
1370 return (kern_fcntl(td, args->fd, F_SETFL, arg));
1371
1372 case LINUX_F_GETLK:
1373 error = copyin((void *)args->arg, &linux_flock,
1374 sizeof(linux_flock));
1375 if (error)
1376 return (error);
1377 linux_to_bsd_flock(&linux_flock, &bsd_flock);
1378 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
1379 if (error)
1380 return (error);
1381 bsd_to_linux_flock(&bsd_flock, &linux_flock);
1382 return (copyout(&linux_flock, (void *)args->arg,
1383 sizeof(linux_flock)));
1384
1385 case LINUX_F_SETLK:
1386 error = copyin((void *)args->arg, &linux_flock,
1387 sizeof(linux_flock));
1388 if (error)
1389 return (error);
1390 linux_to_bsd_flock(&linux_flock, &bsd_flock);
1391 return (kern_fcntl(td, args->fd, F_SETLK,
1392 (intptr_t)&bsd_flock));
1393
1394 case LINUX_F_SETLKW:
1395 error = copyin((void *)args->arg, &linux_flock,
1396 sizeof(linux_flock));
1397 if (error)
1398 return (error);
1399 linux_to_bsd_flock(&linux_flock, &bsd_flock);
1400 return (kern_fcntl(td, args->fd, F_SETLKW,
1401 (intptr_t)&bsd_flock));
1402
1403 case LINUX_F_GETOWN:
1404 return (kern_fcntl(td, args->fd, F_GETOWN, 0));
1405
1406 case LINUX_F_SETOWN:
1407 /*
1408 * XXX some Linux applications depend on F_SETOWN having no
1409 * significant effect for pipes (SIGIO is not delivered for
1410 * pipes under Linux-2.2.35 at least).
1411 */
1412 error = fget(td, args->fd,
1413 &cap_fcntl_rights, &fp);
1414 if (error)
1415 return (error);
1416 if (fp->f_type == DTYPE_PIPE) {
1417 fdrop(fp, td);
1418 return (EINVAL);
1419 }
1420 fdrop(fp, td);
1421
1422 return (kern_fcntl(td, args->fd, F_SETOWN, args->arg));
1423
1424 case LINUX_F_DUPFD_CLOEXEC:
1425 return (kern_fcntl(td, args->fd, F_DUPFD_CLOEXEC, args->arg));
1426 /*
1427 * Our F_SEAL_* values match Linux one for maximum compatibility. So we
1428 * only needed to account for different values for fcntl(2) commands.
1429 */
1430 case LINUX_F_GET_SEALS:
1431 error = kern_fcntl(td, args->fd, F_GET_SEALS, 0);
1432 if (error != 0)
1433 return (error);
1434 td->td_retval[0] = bsd_to_linux_bits(td->td_retval[0],
1435 seal_bitmap, 0);
1436 return (0);
1437
1438 case LINUX_F_ADD_SEALS:
1439 return (kern_fcntl(td, args->fd, F_ADD_SEALS,
1440 linux_to_bsd_bits(args->arg, seal_bitmap, 0)));
1441
1442 case LINUX_F_GETPIPE_SZ:
1443 error = fget(td, args->fd,
1444 &cap_fcntl_rights, &fp);
1445 if (error != 0)
1446 return (error);
1447 if (fp->f_type != DTYPE_PIPE) {
1448 fdrop(fp, td);
1449 return (EINVAL);
1450 }
1451 fpipe = fp->f_data;
1452 td->td_retval[0] = fpipe->pipe_buffer.size;
1453 fdrop(fp, td);
1454 return (0);
1455
1456 default:
1457 linux_msg(td, "unsupported fcntl cmd %d", args->cmd);
1458 return (EINVAL);
1459 }
1460 }
1461
1462 int
linux_fcntl(struct thread * td,struct linux_fcntl_args * args)1463 linux_fcntl(struct thread *td, struct linux_fcntl_args *args)
1464 {
1465
1466 return (fcntl_common(td, args));
1467 }
1468
1469 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
1470 int
linux_fcntl64(struct thread * td,struct linux_fcntl64_args * args)1471 linux_fcntl64(struct thread *td, struct linux_fcntl64_args *args)
1472 {
1473 struct l_flock64 linux_flock;
1474 struct flock bsd_flock;
1475 struct linux_fcntl_args fcntl_args;
1476 int error;
1477
1478 switch (args->cmd) {
1479 case LINUX_F_GETLK64:
1480 error = copyin((void *)args->arg, &linux_flock,
1481 sizeof(linux_flock));
1482 if (error)
1483 return (error);
1484 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
1485 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
1486 if (error)
1487 return (error);
1488 bsd_to_linux_flock64(&bsd_flock, &linux_flock);
1489 return (copyout(&linux_flock, (void *)args->arg,
1490 sizeof(linux_flock)));
1491
1492 case LINUX_F_SETLK64:
1493 error = copyin((void *)args->arg, &linux_flock,
1494 sizeof(linux_flock));
1495 if (error)
1496 return (error);
1497 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
1498 return (kern_fcntl(td, args->fd, F_SETLK,
1499 (intptr_t)&bsd_flock));
1500
1501 case LINUX_F_SETLKW64:
1502 error = copyin((void *)args->arg, &linux_flock,
1503 sizeof(linux_flock));
1504 if (error)
1505 return (error);
1506 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
1507 return (kern_fcntl(td, args->fd, F_SETLKW,
1508 (intptr_t)&bsd_flock));
1509 }
1510
1511 fcntl_args.fd = args->fd;
1512 fcntl_args.cmd = args->cmd;
1513 fcntl_args.arg = args->arg;
1514 return (fcntl_common(td, &fcntl_args));
1515 }
1516 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
1517
1518 #ifdef LINUX_LEGACY_SYSCALLS
1519 int
linux_chown(struct thread * td,struct linux_chown_args * args)1520 linux_chown(struct thread *td, struct linux_chown_args *args)
1521 {
1522
1523 return (kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE,
1524 args->uid, args->gid, 0));
1525 }
1526 #endif
1527
1528 int
linux_fchownat(struct thread * td,struct linux_fchownat_args * args)1529 linux_fchownat(struct thread *td, struct linux_fchownat_args *args)
1530 {
1531 int dfd, flag, unsupported;
1532
1533 unsupported = args->flag & ~(LINUX_AT_SYMLINK_NOFOLLOW | LINUX_AT_EMPTY_PATH);
1534 if (unsupported != 0) {
1535 linux_msg(td, "fchownat unsupported flag 0x%x", unsupported);
1536 return (EINVAL);
1537 }
1538
1539 flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) == 0 ? 0 :
1540 AT_SYMLINK_NOFOLLOW;
1541 flag |= (args->flag & LINUX_AT_EMPTY_PATH) == 0 ? 0 :
1542 AT_EMPTY_PATH;
1543
1544 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
1545 return (kern_fchownat(td, dfd, args->filename, UIO_USERSPACE,
1546 args->uid, args->gid, flag));
1547 }
1548
1549 #ifdef LINUX_LEGACY_SYSCALLS
1550 int
linux_lchown(struct thread * td,struct linux_lchown_args * args)1551 linux_lchown(struct thread *td, struct linux_lchown_args *args)
1552 {
1553
1554 return (kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE, args->uid,
1555 args->gid, AT_SYMLINK_NOFOLLOW));
1556 }
1557 #endif
1558
1559 static int
convert_fadvice(int advice)1560 convert_fadvice(int advice)
1561 {
1562 switch (advice) {
1563 case LINUX_POSIX_FADV_NORMAL:
1564 return (POSIX_FADV_NORMAL);
1565 case LINUX_POSIX_FADV_RANDOM:
1566 return (POSIX_FADV_RANDOM);
1567 case LINUX_POSIX_FADV_SEQUENTIAL:
1568 return (POSIX_FADV_SEQUENTIAL);
1569 case LINUX_POSIX_FADV_WILLNEED:
1570 return (POSIX_FADV_WILLNEED);
1571 case LINUX_POSIX_FADV_DONTNEED:
1572 return (POSIX_FADV_DONTNEED);
1573 case LINUX_POSIX_FADV_NOREUSE:
1574 return (POSIX_FADV_NOREUSE);
1575 default:
1576 return (-1);
1577 }
1578 }
1579
1580 int
linux_fadvise64(struct thread * td,struct linux_fadvise64_args * args)1581 linux_fadvise64(struct thread *td, struct linux_fadvise64_args *args)
1582 {
1583 off_t offset;
1584 int advice;
1585
1586 #if defined(__amd64__) && defined(COMPAT_LINUX32)
1587 offset = PAIR32TO64(off_t, args->offset);
1588 #else
1589 offset = args->offset;
1590 #endif
1591
1592 advice = convert_fadvice(args->advice);
1593 if (advice == -1)
1594 return (EINVAL);
1595 return (kern_posix_fadvise(td, args->fd, offset, args->len, advice));
1596 }
1597
1598 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
1599 int
linux_fadvise64_64(struct thread * td,struct linux_fadvise64_64_args * args)1600 linux_fadvise64_64(struct thread *td, struct linux_fadvise64_64_args *args)
1601 {
1602 off_t len, offset;
1603 int advice;
1604
1605 #if defined(__amd64__) && defined(COMPAT_LINUX32)
1606 len = PAIR32TO64(off_t, args->len);
1607 offset = PAIR32TO64(off_t, args->offset);
1608 #else
1609 len = args->len;
1610 offset = args->offset;
1611 #endif
1612
1613 advice = convert_fadvice(args->advice);
1614 if (advice == -1)
1615 return (EINVAL);
1616 return (kern_posix_fadvise(td, args->fd, offset, len, advice));
1617 }
1618 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
1619
1620 #ifdef LINUX_LEGACY_SYSCALLS
1621 int
linux_pipe(struct thread * td,struct linux_pipe_args * args)1622 linux_pipe(struct thread *td, struct linux_pipe_args *args)
1623 {
1624 int fildes[2];
1625 int error;
1626
1627 error = kern_pipe(td, fildes, 0, NULL, NULL);
1628 if (error != 0)
1629 return (error);
1630
1631 error = copyout(fildes, args->pipefds, sizeof(fildes));
1632 if (error != 0) {
1633 (void)kern_close(td, fildes[0]);
1634 (void)kern_close(td, fildes[1]);
1635 }
1636
1637 return (error);
1638 }
1639 #endif
1640
1641 int
linux_pipe2(struct thread * td,struct linux_pipe2_args * args)1642 linux_pipe2(struct thread *td, struct linux_pipe2_args *args)
1643 {
1644 int fildes[2];
1645 int error, flags;
1646
1647 if ((args->flags & ~(LINUX_O_NONBLOCK | LINUX_O_CLOEXEC)) != 0)
1648 return (EINVAL);
1649
1650 flags = 0;
1651 if ((args->flags & LINUX_O_NONBLOCK) != 0)
1652 flags |= O_NONBLOCK;
1653 if ((args->flags & LINUX_O_CLOEXEC) != 0)
1654 flags |= O_CLOEXEC;
1655 error = kern_pipe(td, fildes, flags, NULL, NULL);
1656 if (error != 0)
1657 return (error);
1658
1659 error = copyout(fildes, args->pipefds, sizeof(fildes));
1660 if (error != 0) {
1661 (void)kern_close(td, fildes[0]);
1662 (void)kern_close(td, fildes[1]);
1663 }
1664
1665 return (error);
1666 }
1667
1668 int
linux_dup3(struct thread * td,struct linux_dup3_args * args)1669 linux_dup3(struct thread *td, struct linux_dup3_args *args)
1670 {
1671 int cmd;
1672 intptr_t newfd;
1673
1674 if (args->oldfd == args->newfd)
1675 return (EINVAL);
1676 if ((args->flags & ~LINUX_O_CLOEXEC) != 0)
1677 return (EINVAL);
1678 if (args->flags & LINUX_O_CLOEXEC)
1679 cmd = F_DUP2FD_CLOEXEC;
1680 else
1681 cmd = F_DUP2FD;
1682
1683 newfd = args->newfd;
1684 return (kern_fcntl(td, args->oldfd, cmd, newfd));
1685 }
1686
1687 int
linux_fallocate(struct thread * td,struct linux_fallocate_args * args)1688 linux_fallocate(struct thread *td, struct linux_fallocate_args *args)
1689 {
1690 off_t len, offset;
1691
1692 /*
1693 * We emulate only posix_fallocate system call for which
1694 * mode should be 0.
1695 */
1696 if (args->mode != 0)
1697 return (EOPNOTSUPP);
1698
1699 #if defined(__amd64__) && defined(COMPAT_LINUX32)
1700 len = PAIR32TO64(off_t, args->len);
1701 offset = PAIR32TO64(off_t, args->offset);
1702 #else
1703 len = args->len;
1704 offset = args->offset;
1705 #endif
1706
1707 return (kern_posix_fallocate(td, args->fd, offset, len));
1708 }
1709
1710 int
linux_copy_file_range(struct thread * td,struct linux_copy_file_range_args * args)1711 linux_copy_file_range(struct thread *td, struct linux_copy_file_range_args
1712 *args)
1713 {
1714 l_loff_t inoff, outoff, *inoffp, *outoffp;
1715 int error, flags;
1716
1717 /*
1718 * copy_file_range(2) on Linux doesn't define any flags (yet), so is
1719 * the native implementation. Enforce it.
1720 */
1721 if (args->flags != 0) {
1722 linux_msg(td, "copy_file_range unsupported flags 0x%x",
1723 args->flags);
1724 return (EINVAL);
1725 }
1726 flags = 0;
1727 inoffp = outoffp = NULL;
1728 if (args->off_in != NULL) {
1729 error = copyin(args->off_in, &inoff, sizeof(l_loff_t));
1730 if (error != 0)
1731 return (error);
1732 inoffp = &inoff;
1733 }
1734 if (args->off_out != NULL) {
1735 error = copyin(args->off_out, &outoff, sizeof(l_loff_t));
1736 if (error != 0)
1737 return (error);
1738 outoffp = &outoff;
1739 }
1740
1741 error = kern_copy_file_range(td, args->fd_in, inoffp, args->fd_out,
1742 outoffp, args->len, flags);
1743 if (error == 0 && args->off_in != NULL)
1744 error = copyout(inoffp, args->off_in, sizeof(l_loff_t));
1745 if (error == 0 && args->off_out != NULL)
1746 error = copyout(outoffp, args->off_out, sizeof(l_loff_t));
1747 return (error);
1748 }
1749
1750 #define LINUX_MEMFD_PREFIX "memfd:"
1751
1752 int
linux_memfd_create(struct thread * td,struct linux_memfd_create_args * args)1753 linux_memfd_create(struct thread *td, struct linux_memfd_create_args *args)
1754 {
1755 char memfd_name[LINUX_NAME_MAX + 1];
1756 int error, flags, shmflags, oflags;
1757
1758 /*
1759 * This is our clever trick to avoid the heap allocation to copy in the
1760 * uname. We don't really need to go this far out of our way, but it
1761 * does keep the rest of this function fairly clean as they don't have
1762 * to worry about cleanup on the way out.
1763 */
1764 error = copyinstr(args->uname_ptr,
1765 memfd_name + sizeof(LINUX_MEMFD_PREFIX) - 1,
1766 LINUX_NAME_MAX - sizeof(LINUX_MEMFD_PREFIX) - 1, NULL);
1767 if (error != 0) {
1768 if (error == ENAMETOOLONG)
1769 error = EINVAL;
1770 return (error);
1771 }
1772
1773 memcpy(memfd_name, LINUX_MEMFD_PREFIX, sizeof(LINUX_MEMFD_PREFIX) - 1);
1774 flags = linux_to_bsd_bits(args->flags, mfd_bitmap, 0);
1775 if ((flags & ~(MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_HUGETLB |
1776 MFD_HUGE_MASK)) != 0)
1777 return (EINVAL);
1778 /* Size specified but no HUGETLB. */
1779 if ((flags & MFD_HUGE_MASK) != 0 && (flags & MFD_HUGETLB) == 0)
1780 return (EINVAL);
1781 /* We don't actually support HUGETLB. */
1782 if ((flags & MFD_HUGETLB) != 0)
1783 return (ENOSYS);
1784 oflags = O_RDWR;
1785 shmflags = SHM_GROW_ON_WRITE;
1786 if ((flags & MFD_CLOEXEC) != 0)
1787 oflags |= O_CLOEXEC;
1788 if ((flags & MFD_ALLOW_SEALING) != 0)
1789 shmflags |= SHM_ALLOW_SEALING;
1790 return (kern_shm_open2(td, SHM_ANON, oflags, 0, shmflags, NULL,
1791 memfd_name));
1792 }
1793
1794 int
linux_splice(struct thread * td,struct linux_splice_args * args)1795 linux_splice(struct thread *td, struct linux_splice_args *args)
1796 {
1797
1798 linux_msg(td, "syscall splice not really implemented");
1799
1800 /*
1801 * splice(2) is documented to return EINVAL in various circumstances;
1802 * returning it instead of ENOSYS should hint the caller to use fallback
1803 * instead.
1804 */
1805 return (EINVAL);
1806 }
1807
1808 int
linux_close_range(struct thread * td,struct linux_close_range_args * args)1809 linux_close_range(struct thread *td, struct linux_close_range_args *args)
1810 {
1811 u_int flags = 0;
1812
1813 /*
1814 * Implementing close_range(CLOSE_RANGE_UNSHARE) allows Linux to
1815 * unshare filedesc table of the calling thread from others threads
1816 * in a thread group (i.e., process in the FreeBSD) or others processes,
1817 * which shares the same table, before closing the files. FreeBSD does
1818 * not have compatible unsharing mechanism due to the fact that sharing
1819 * process resources, including filedesc table, is at thread level in the
1820 * Linux, while in the FreeBSD it is at the process level.
1821 * Return EINVAL for now if the CLOSE_RANGE_UNSHARE flag is specified
1822 * until this new Linux API stabilizes.
1823 */
1824
1825 if ((args->flags & ~(LINUX_CLOSE_RANGE_CLOEXEC)) != 0)
1826 return (EINVAL);
1827 if (args->first > args->last)
1828 return (EINVAL);
1829 if ((args->flags & LINUX_CLOSE_RANGE_CLOEXEC) != 0)
1830 flags |= CLOSE_RANGE_CLOEXEC;
1831 return (kern_close_range(td, flags, args->first, args->last));
1832 }
1833
1834 int
linux_enobufs2eagain(struct thread * td,int fd,int error)1835 linux_enobufs2eagain(struct thread *td, int fd, int error)
1836 {
1837 struct file *fp;
1838
1839 if (error != ENOBUFS)
1840 return (error);
1841 if (fget(td, fd, &cap_no_rights, &fp) != 0)
1842 return (error);
1843 if (fp->f_type == DTYPE_SOCKET && (fp->f_flag & FNONBLOCK) != 0)
1844 error = EAGAIN;
1845 fdrop(fp, td);
1846 return (error);
1847 }
1848
1849 int
linux_write(struct thread * td,struct linux_write_args * args)1850 linux_write(struct thread *td, struct linux_write_args *args)
1851 {
1852 struct write_args bargs = {
1853 .fd = args->fd,
1854 .buf = args->buf,
1855 .nbyte = args->nbyte,
1856 };
1857
1858 return (linux_enobufs2eagain(td, args->fd, sys_write(td, &bargs)));
1859 }
1860
1861 int
linux_writev(struct thread * td,struct linux_writev_args * args)1862 linux_writev(struct thread *td, struct linux_writev_args *args)
1863 {
1864 struct uio *auio;
1865 int error;
1866
1867 #ifdef COMPAT_LINUX32
1868 error = freebsd32_copyinuio(PTRIN(args->iovp), args->iovcnt, &auio);
1869 #else
1870 error = copyinuio(args->iovp, args->iovcnt, &auio);
1871 #endif
1872 if (error != 0)
1873 return (error);
1874 error = kern_writev(td, args->fd, auio);
1875 freeuio(auio);
1876 return (linux_enobufs2eagain(td, args->fd, error));
1877 }
1878