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_default_stacksize = 8 * 1024 * 1024;
76 SYSCTL_INT(_compat_linux, OID_AUTO, default_stacksize, CTLFLAG_RWTUN,
77 &linux_default_stacksize, 0,
78 "Default soft stack size resource limit, or -1 for unlimited");
80 int linux_dummy_rlimits = 0;
81 SYSCTL_INT(_compat_linux, OID_AUTO, dummy_rlimits, CTLFLAG_RWTUN,
82 &linux_dummy_rlimits, 0,
83 "Return dummy values for unsupported Linux-specific rlimits");
85 int linux_ignore_ip_recverr = 1;
86 SYSCTL_INT(_compat_linux, OID_AUTO, ignore_ip_recverr, CTLFLAG_RWTUN,
87 &linux_ignore_ip_recverr, 0, "Ignore enabling IP_RECVERR");
89 int linux_preserve_vstatus = 0;
90 SYSCTL_INT(_compat_linux, OID_AUTO, preserve_vstatus, CTLFLAG_RWTUN,
91 &linux_preserve_vstatus, 0, "Preserve VSTATUS termios(4) flag");
93 bool linux_map_sched_prio = true;
94 SYSCTL_BOOL(_compat_linux, OID_AUTO, map_sched_prio, CTLFLAG_RDTUN,
95 &linux_map_sched_prio, 0, "Map scheduler priorities to Linux priorities "
96 "(not POSIX compliant)");
98 int linux_use_emul_path = 1;
99 SYSCTL_INT(_compat_linux, OID_AUTO, use_emul_path, CTLFLAG_RWTUN,
100 &linux_use_emul_path, 0, "Use linux.compat.emul_path");
102 static int linux_set_osname(struct thread *td, char *osname);
103 static int linux_set_osrelease(struct thread *td, char *osrelease);
104 static int linux_set_oss_version(struct thread *td, int oss_version);
107 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
109 char osname[LINUX_MAX_UTSNAME];
112 linux_get_osname(req->td, osname);
113 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
114 if (error != 0 || req->newptr == NULL)
116 error = linux_set_osname(req->td, osname);
121 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
122 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
123 0, 0, linux_sysctl_osname, "A",
124 "Linux kernel OS name");
127 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
129 char osrelease[LINUX_MAX_UTSNAME];
132 linux_get_osrelease(req->td, osrelease);
133 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
134 if (error != 0 || req->newptr == NULL)
136 error = linux_set_osrelease(req->td, osrelease);
141 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
142 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
143 0, 0, linux_sysctl_osrelease, "A",
144 "Linux kernel OS release");
147 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
152 oss_version = linux_get_oss_version(req->td);
153 error = sysctl_handle_int(oidp, &oss_version, 0, req);
154 if (error != 0 || req->newptr == NULL)
156 error = linux_set_oss_version(req->td, oss_version);
161 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
162 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
163 0, 0, linux_sysctl_oss_version, "I",
164 "Linux OSS version");
167 * Map the osrelease into integer
170 linux_map_osrel(char *osrelease, int *osrel)
172 char *sep, *eosrelease;
173 int len, v0, v1, v2, v;
175 len = strlen(osrelease);
176 eosrelease = osrelease + len;
177 v0 = strtol(osrelease, &sep, 10);
178 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
181 v1 = strtol(osrelease, &sep, 10);
182 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
185 v2 = strtol(osrelease, &sep, 10);
186 if (osrelease == sep ||
187 (sep != eosrelease && (sep + 1 >= eosrelease || *sep != '-')))
190 v = LINUX_KERNVER(v0, v1, v2);
191 if (v < LINUX_KERNVER(1, 0, 0))
201 * Find a prison with Linux info.
202 * Return the Linux info and the (locked) prison.
204 static struct linux_prison *
205 linux_find_prison(struct prison *spr, struct prison **prp)
208 struct linux_prison *lpr;
210 for (pr = spr;; pr = pr->pr_parent) {
211 mtx_lock(&pr->pr_mtx);
212 lpr = (pr == &prison0)
214 : osd_jail_get(pr, linux_osd_jail_slot);
217 mtx_unlock(&pr->pr_mtx);
225 * Ensure a prison has its own Linux info. If lprp is non-null, point it to
226 * the Linux info and lock the prison.
229 linux_alloc_prison(struct prison *pr, struct linux_prison **lprp)
232 struct linux_prison *lpr, *nlpr;
235 /* If this prison already has Linux info, return that. */
236 lpr = linux_find_prison(pr, &ppr);
240 * Allocate a new info record. Then check again, in case something
241 * changed during the allocation.
243 mtx_unlock(&ppr->pr_mtx);
244 nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK);
245 rsv = osd_reserve(linux_osd_jail_slot);
246 lpr = linux_find_prison(pr, &ppr);
248 free(nlpr, M_PRISON);
249 osd_free_reserved(rsv);
252 /* Inherit the initial values from the ancestor. */
253 mtx_lock(&pr->pr_mtx);
254 (void)osd_jail_set_reserved(pr, linux_osd_jail_slot, rsv, nlpr);
255 bcopy(lpr, nlpr, sizeof(*lpr));
257 mtx_unlock(&ppr->pr_mtx);
262 mtx_unlock(&pr->pr_mtx);
266 * Jail OSD methods for Linux prison data.
269 linux_prison_create(void *obj, void *data)
271 struct prison *pr = obj;
272 struct vfsoptlist *opts = data;
275 if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 &&
276 jsys == JAIL_SYS_INHERIT)
279 * Inherit a prison's initial values from its parent
280 * (different from JAIL_SYS_INHERIT which also inherits changes).
282 linux_alloc_prison(pr, NULL);
287 linux_prison_check(void *obj __unused, void *data)
289 struct vfsoptlist *opts = data;
290 char *osname, *osrelease;
291 int error, jsys, len, oss_version;
293 /* Check that the parameters are correct. */
294 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
295 if (error != ENOENT) {
298 if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT)
301 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
302 if (error != ENOENT) {
305 if (len == 0 || osname[len - 1] != '\0')
307 if (len > LINUX_MAX_UTSNAME) {
308 vfs_opterror(opts, "linux.osname too long");
309 return (ENAMETOOLONG);
312 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
313 if (error != ENOENT) {
316 if (len == 0 || osrelease[len - 1] != '\0')
318 if (len > LINUX_MAX_UTSNAME) {
319 vfs_opterror(opts, "linux.osrelease too long");
320 return (ENAMETOOLONG);
322 error = linux_map_osrel(osrelease, NULL);
324 vfs_opterror(opts, "linux.osrelease format error");
328 error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
329 sizeof(oss_version));
337 linux_prison_set(void *obj, void *data)
339 struct linux_prison *lpr;
340 struct prison *pr = obj;
341 struct vfsoptlist *opts = data;
342 char *osname, *osrelease;
343 int error, gotversion, jsys, len, oss_version;
345 /* Set the parameters, which should be correct. */
346 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
349 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
354 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
359 error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
360 sizeof(oss_version));
368 case JAIL_SYS_INHERIT:
369 /* "linux=inherit": inherit the parent's Linux info. */
370 mtx_lock(&pr->pr_mtx);
371 osd_jail_del(pr, linux_osd_jail_slot);
372 mtx_unlock(&pr->pr_mtx);
376 * "linux=new" or "linux.*":
377 * the prison gets its own Linux info.
379 linux_alloc_prison(pr, &lpr);
381 (void)linux_map_osrel(osrelease, &lpr->pr_osrel);
382 strlcpy(lpr->pr_osrelease, osrelease,
386 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
388 lpr->pr_oss_version = oss_version;
389 mtx_unlock(&pr->pr_mtx);
395 SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters");
396 SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME,
397 "Jail Linux kernel OS name");
398 SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME,
399 "Jail Linux kernel OS release");
400 SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW,
401 "I", "Jail Linux OSS version");
404 linux_prison_get(void *obj, void *data)
406 struct linux_prison *lpr;
408 struct prison *pr = obj;
409 struct vfsoptlist *opts = data;
414 /* See if this prison is the one with the Linux info. */
415 lpr = linux_find_prison(pr, &ppr);
416 i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
417 error = vfs_setopt(opts, "linux", &i, sizeof(i));
418 if (error != 0 && error != ENOENT)
421 error = vfs_setopts(opts, "linux.osname", lpr->pr_osname);
422 if (error != 0 && error != ENOENT)
424 error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease);
425 if (error != 0 && error != ENOENT)
427 error = vfs_setopt(opts, "linux.oss_version",
428 &lpr->pr_oss_version, sizeof(lpr->pr_oss_version));
429 if (error != 0 && error != ENOENT)
433 * If this prison is inheriting its Linux info, report
434 * empty/zero parameters.
436 error = vfs_setopts(opts, "linux.osname", "");
437 if (error != 0 && error != ENOENT)
439 error = vfs_setopts(opts, "linux.osrelease", "");
440 if (error != 0 && error != ENOENT)
442 error = vfs_setopt(opts, "linux.oss_version", &version0,
443 sizeof(lpr->pr_oss_version));
444 if (error != 0 && error != ENOENT)
450 mtx_unlock(&ppr->pr_mtx);
456 linux_prison_destructor(void *data)
459 free(data, M_PRISON);
463 linux_osd_jail_register(void)
466 osd_method_t methods[PR_MAXMETHOD] = {
467 [PR_METHOD_CREATE] = linux_prison_create,
468 [PR_METHOD_GET] = linux_prison_get,
469 [PR_METHOD_SET] = linux_prison_set,
470 [PR_METHOD_CHECK] = linux_prison_check
473 linux_osd_jail_slot =
474 osd_jail_register(linux_prison_destructor, methods);
475 /* Copy the system Linux info to any current prisons. */
476 sx_slock(&allprison_lock);
477 TAILQ_FOREACH(pr, &allprison, pr_list)
478 linux_alloc_prison(pr, NULL);
479 sx_sunlock(&allprison_lock);
483 linux_osd_jail_deregister(void)
486 osd_jail_deregister(linux_osd_jail_slot);
490 linux_get_osname(struct thread *td, char *dst)
493 struct linux_prison *lpr;
495 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
496 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
497 mtx_unlock(&pr->pr_mtx);
501 linux_set_osname(struct thread *td, char *osname)
504 struct linux_prison *lpr;
506 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
507 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
508 mtx_unlock(&pr->pr_mtx);
514 linux_get_osrelease(struct thread *td, char *dst)
517 struct linux_prison *lpr;
519 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
520 bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME);
521 mtx_unlock(&pr->pr_mtx);
525 linux_kernver(struct thread *td)
528 struct linux_prison *lpr;
531 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
532 osrel = lpr->pr_osrel;
533 mtx_unlock(&pr->pr_mtx);
539 linux_set_osrelease(struct thread *td, char *osrelease)
542 struct linux_prison *lpr;
545 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
546 error = linux_map_osrel(osrelease, &lpr->pr_osrel);
548 strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME);
549 mtx_unlock(&pr->pr_mtx);
555 linux_get_oss_version(struct thread *td)
558 struct linux_prison *lpr;
561 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
562 version = lpr->pr_oss_version;
563 mtx_unlock(&pr->pr_mtx);
569 linux_set_oss_version(struct thread *td, int oss_version)
572 struct linux_prison *lpr;
574 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
575 lpr->pr_oss_version = oss_version;
576 mtx_unlock(&pr->pr_mtx);