2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1999 Marcel Moolenaar
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/kernel.h>
35 #include <sys/systm.h>
36 #include <sys/sysctl.h>
38 #include <sys/malloc.h>
39 #include <sys/mount.h>
44 #include <compat/linux/linux_mib.h>
45 #include <compat/linux/linux_misc.h>
48 char pr_osname[LINUX_MAX_UTSNAME];
49 char pr_osrelease[LINUX_MAX_UTSNAME];
54 static struct linux_prison lprison0 = {
56 .pr_osrelease = LINUX_VERSION_STR,
57 .pr_oss_version = 0x030600,
58 .pr_osrel = LINUX_VERSION_CODE
61 static unsigned linux_osd_jail_slot;
63 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
67 SYSCTL_INT(_compat_linux, OID_AUTO, debug, CTLFLAG_RWTUN,
68 &linux_debug, 0, "Log warnings from linux(4); or 0 to disable");
70 int linux_default_openfiles = 1024;
71 SYSCTL_INT(_compat_linux, OID_AUTO, default_openfiles, CTLFLAG_RWTUN,
72 &linux_default_openfiles, 0,
73 "Default soft openfiles resource limit, or -1 for unlimited");
75 int linux_ignore_ip_recverr = 1;
76 SYSCTL_INT(_compat_linux, OID_AUTO, ignore_ip_recverr, CTLFLAG_RWTUN,
77 &linux_ignore_ip_recverr, 0, "Ignore enabling IP_RECVERR");
79 int linux_preserve_vstatus = 0;
80 SYSCTL_INT(_compat_linux, OID_AUTO, preserve_vstatus, CTLFLAG_RWTUN,
81 &linux_preserve_vstatus, 0, "Preserve VSTATUS termios(4) flag");
83 bool linux_map_sched_prio = true;
84 SYSCTL_BOOL(_compat_linux, OID_AUTO, map_sched_prio, CTLFLAG_RDTUN,
85 &linux_map_sched_prio, 0, "Map scheduler priorities to Linux priorities "
86 "(not POSIX compliant)");
88 int linux_use_emul_path = 1;
89 SYSCTL_INT(_compat_linux, OID_AUTO, use_emul_path, CTLFLAG_RWTUN,
90 &linux_use_emul_path, 0, "Use linux.compat.emul_path");
92 static int linux_set_osname(struct thread *td, char *osname);
93 static int linux_set_osrelease(struct thread *td, char *osrelease);
94 static int linux_set_oss_version(struct thread *td, int oss_version);
97 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
99 char osname[LINUX_MAX_UTSNAME];
102 linux_get_osname(req->td, osname);
103 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
104 if (error != 0 || req->newptr == NULL)
106 error = linux_set_osname(req->td, osname);
111 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
112 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
113 0, 0, linux_sysctl_osname, "A",
114 "Linux kernel OS name");
117 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
119 char osrelease[LINUX_MAX_UTSNAME];
122 linux_get_osrelease(req->td, osrelease);
123 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
124 if (error != 0 || req->newptr == NULL)
126 error = linux_set_osrelease(req->td, osrelease);
131 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
132 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
133 0, 0, linux_sysctl_osrelease, "A",
134 "Linux kernel OS release");
137 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
142 oss_version = linux_get_oss_version(req->td);
143 error = sysctl_handle_int(oidp, &oss_version, 0, req);
144 if (error != 0 || req->newptr == NULL)
146 error = linux_set_oss_version(req->td, oss_version);
151 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
152 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
153 0, 0, linux_sysctl_oss_version, "I",
154 "Linux OSS version");
157 * Map the osrelease into integer
160 linux_map_osrel(char *osrelease, int *osrel)
162 char *sep, *eosrelease;
163 int len, v0, v1, v2, v;
165 len = strlen(osrelease);
166 eosrelease = osrelease + len;
167 v0 = strtol(osrelease, &sep, 10);
168 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
171 v1 = strtol(osrelease, &sep, 10);
172 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
175 v2 = strtol(osrelease, &sep, 10);
176 if (osrelease == sep ||
177 (sep != eosrelease && (sep + 1 >= eosrelease || *sep != '-')))
180 v = LINUX_KERNVER(v0, v1, v2);
181 if (v < LINUX_KERNVER(1, 0, 0))
191 * Find a prison with Linux info.
192 * Return the Linux info and the (locked) prison.
194 static struct linux_prison *
195 linux_find_prison(struct prison *spr, struct prison **prp)
198 struct linux_prison *lpr;
200 for (pr = spr;; pr = pr->pr_parent) {
201 mtx_lock(&pr->pr_mtx);
202 lpr = (pr == &prison0)
204 : osd_jail_get(pr, linux_osd_jail_slot);
207 mtx_unlock(&pr->pr_mtx);
215 * Ensure a prison has its own Linux info. If lprp is non-null, point it to
216 * the Linux info and lock the prison.
219 linux_alloc_prison(struct prison *pr, struct linux_prison **lprp)
222 struct linux_prison *lpr, *nlpr;
225 /* If this prison already has Linux info, return that. */
226 lpr = linux_find_prison(pr, &ppr);
230 * Allocate a new info record. Then check again, in case something
231 * changed during the allocation.
233 mtx_unlock(&ppr->pr_mtx);
234 nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK);
235 rsv = osd_reserve(linux_osd_jail_slot);
236 lpr = linux_find_prison(pr, &ppr);
238 free(nlpr, M_PRISON);
239 osd_free_reserved(rsv);
242 /* Inherit the initial values from the ancestor. */
243 mtx_lock(&pr->pr_mtx);
244 (void)osd_jail_set_reserved(pr, linux_osd_jail_slot, rsv, nlpr);
245 bcopy(lpr, nlpr, sizeof(*lpr));
247 mtx_unlock(&ppr->pr_mtx);
252 mtx_unlock(&pr->pr_mtx);
256 * Jail OSD methods for Linux prison data.
259 linux_prison_create(void *obj, void *data)
261 struct prison *pr = obj;
262 struct vfsoptlist *opts = data;
265 if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 &&
266 jsys == JAIL_SYS_INHERIT)
269 * Inherit a prison's initial values from its parent
270 * (different from JAIL_SYS_INHERIT which also inherits changes).
272 linux_alloc_prison(pr, NULL);
277 linux_prison_check(void *obj __unused, void *data)
279 struct vfsoptlist *opts = data;
280 char *osname, *osrelease;
281 int error, jsys, len, oss_version;
283 /* Check that the parameters are correct. */
284 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
285 if (error != ENOENT) {
288 if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT)
291 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
292 if (error != ENOENT) {
295 if (len == 0 || osname[len - 1] != '\0')
297 if (len > LINUX_MAX_UTSNAME) {
298 vfs_opterror(opts, "linux.osname too long");
299 return (ENAMETOOLONG);
302 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
303 if (error != ENOENT) {
306 if (len == 0 || osrelease[len - 1] != '\0')
308 if (len > LINUX_MAX_UTSNAME) {
309 vfs_opterror(opts, "linux.osrelease too long");
310 return (ENAMETOOLONG);
312 error = linux_map_osrel(osrelease, NULL);
314 vfs_opterror(opts, "linux.osrelease format error");
318 error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
319 sizeof(oss_version));
327 linux_prison_set(void *obj, void *data)
329 struct linux_prison *lpr;
330 struct prison *pr = obj;
331 struct vfsoptlist *opts = data;
332 char *osname, *osrelease;
333 int error, gotversion, jsys, len, oss_version;
335 /* Set the parameters, which should be correct. */
336 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
339 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
344 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
349 error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
350 sizeof(oss_version));
358 case JAIL_SYS_INHERIT:
359 /* "linux=inherit": inherit the parent's Linux info. */
360 mtx_lock(&pr->pr_mtx);
361 osd_jail_del(pr, linux_osd_jail_slot);
362 mtx_unlock(&pr->pr_mtx);
366 * "linux=new" or "linux.*":
367 * the prison gets its own Linux info.
369 linux_alloc_prison(pr, &lpr);
371 (void)linux_map_osrel(osrelease, &lpr->pr_osrel);
372 strlcpy(lpr->pr_osrelease, osrelease,
376 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
378 lpr->pr_oss_version = oss_version;
379 mtx_unlock(&pr->pr_mtx);
385 SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters");
386 SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME,
387 "Jail Linux kernel OS name");
388 SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME,
389 "Jail Linux kernel OS release");
390 SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW,
391 "I", "Jail Linux OSS version");
394 linux_prison_get(void *obj, void *data)
396 struct linux_prison *lpr;
398 struct prison *pr = obj;
399 struct vfsoptlist *opts = data;
404 /* See if this prison is the one with the Linux info. */
405 lpr = linux_find_prison(pr, &ppr);
406 i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
407 error = vfs_setopt(opts, "linux", &i, sizeof(i));
408 if (error != 0 && error != ENOENT)
411 error = vfs_setopts(opts, "linux.osname", lpr->pr_osname);
412 if (error != 0 && error != ENOENT)
414 error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease);
415 if (error != 0 && error != ENOENT)
417 error = vfs_setopt(opts, "linux.oss_version",
418 &lpr->pr_oss_version, sizeof(lpr->pr_oss_version));
419 if (error != 0 && error != ENOENT)
423 * If this prison is inheriting its Linux info, report
424 * empty/zero parameters.
426 error = vfs_setopts(opts, "linux.osname", "");
427 if (error != 0 && error != ENOENT)
429 error = vfs_setopts(opts, "linux.osrelease", "");
430 if (error != 0 && error != ENOENT)
432 error = vfs_setopt(opts, "linux.oss_version", &version0,
433 sizeof(lpr->pr_oss_version));
434 if (error != 0 && error != ENOENT)
440 mtx_unlock(&ppr->pr_mtx);
446 linux_prison_destructor(void *data)
449 free(data, M_PRISON);
453 linux_osd_jail_register(void)
456 osd_method_t methods[PR_MAXMETHOD] = {
457 [PR_METHOD_CREATE] = linux_prison_create,
458 [PR_METHOD_GET] = linux_prison_get,
459 [PR_METHOD_SET] = linux_prison_set,
460 [PR_METHOD_CHECK] = linux_prison_check
463 linux_osd_jail_slot =
464 osd_jail_register(linux_prison_destructor, methods);
465 /* Copy the system Linux info to any current prisons. */
466 sx_slock(&allprison_lock);
467 TAILQ_FOREACH(pr, &allprison, pr_list)
468 linux_alloc_prison(pr, NULL);
469 sx_sunlock(&allprison_lock);
473 linux_osd_jail_deregister(void)
476 osd_jail_deregister(linux_osd_jail_slot);
480 linux_get_osname(struct thread *td, char *dst)
483 struct linux_prison *lpr;
485 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
486 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
487 mtx_unlock(&pr->pr_mtx);
491 linux_set_osname(struct thread *td, char *osname)
494 struct linux_prison *lpr;
496 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
497 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
498 mtx_unlock(&pr->pr_mtx);
504 linux_get_osrelease(struct thread *td, char *dst)
507 struct linux_prison *lpr;
509 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
510 bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME);
511 mtx_unlock(&pr->pr_mtx);
515 linux_kernver(struct thread *td)
518 struct linux_prison *lpr;
521 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
522 osrel = lpr->pr_osrel;
523 mtx_unlock(&pr->pr_mtx);
529 linux_set_osrelease(struct thread *td, char *osrelease)
532 struct linux_prison *lpr;
535 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
536 error = linux_map_osrel(osrelease, &lpr->pr_osrel);
538 strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME);
539 mtx_unlock(&pr->pr_mtx);
545 linux_get_oss_version(struct thread *td)
548 struct linux_prison *lpr;
551 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
552 version = lpr->pr_oss_version;
553 mtx_unlock(&pr->pr_mtx);
559 linux_set_oss_version(struct thread *td, int oss_version)
562 struct linux_prison *lpr;
564 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
565 lpr->pr_oss_version = oss_version;
566 mtx_unlock(&pr->pr_mtx);