1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1999 Marcel Moolenaar 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 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/sdt.h> 37 #include <sys/systm.h> 38 #include <sys/sysctl.h> 39 #include <sys/proc.h> 40 #include <sys/malloc.h> 41 #include <sys/mount.h> 42 #include <sys/jail.h> 43 #include <sys/lock.h> 44 #include <sys/sx.h> 45 46 #include <compat/linux/linux_mib.h> 47 #include <compat/linux/linux_misc.h> 48 49 struct linux_prison { 50 char pr_osname[LINUX_MAX_UTSNAME]; 51 char pr_osrelease[LINUX_MAX_UTSNAME]; 52 int pr_oss_version; 53 int pr_osrel; 54 }; 55 56 static struct linux_prison lprison0 = { 57 .pr_osname = "Linux", 58 .pr_osrelease = LINUX_VERSION_STR, 59 .pr_oss_version = 0x030600, 60 .pr_osrel = LINUX_VERSION_CODE 61 }; 62 63 static unsigned linux_osd_jail_slot; 64 65 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0, "Linux mode"); 66 67 static int linux_set_osname(struct thread *td, char *osname); 68 static int linux_set_osrelease(struct thread *td, char *osrelease); 69 static int linux_set_oss_version(struct thread *td, int oss_version); 70 71 static int 72 linux_sysctl_osname(SYSCTL_HANDLER_ARGS) 73 { 74 char osname[LINUX_MAX_UTSNAME]; 75 int error; 76 77 linux_get_osname(req->td, osname); 78 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req); 79 if (error != 0 || req->newptr == NULL) 80 return (error); 81 error = linux_set_osname(req->td, osname); 82 83 return (error); 84 } 85 86 SYSCTL_PROC(_compat_linux, OID_AUTO, osname, 87 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 88 0, 0, linux_sysctl_osname, "A", 89 "Linux kernel OS name"); 90 91 static int 92 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS) 93 { 94 char osrelease[LINUX_MAX_UTSNAME]; 95 int error; 96 97 linux_get_osrelease(req->td, osrelease); 98 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req); 99 if (error != 0 || req->newptr == NULL) 100 return (error); 101 error = linux_set_osrelease(req->td, osrelease); 102 103 return (error); 104 } 105 106 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease, 107 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 108 0, 0, linux_sysctl_osrelease, "A", 109 "Linux kernel OS release"); 110 111 static int 112 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS) 113 { 114 int oss_version; 115 int error; 116 117 oss_version = linux_get_oss_version(req->td); 118 error = sysctl_handle_int(oidp, &oss_version, 0, req); 119 if (error != 0 || req->newptr == NULL) 120 return (error); 121 error = linux_set_oss_version(req->td, oss_version); 122 123 return (error); 124 } 125 126 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version, 127 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 128 0, 0, linux_sysctl_oss_version, "I", 129 "Linux OSS version"); 130 131 /* 132 * Map the osrelease into integer 133 */ 134 static int 135 linux_map_osrel(char *osrelease, int *osrel) 136 { 137 char *sep, *eosrelease; 138 int len, v0, v1, v2, v; 139 140 len = strlen(osrelease); 141 eosrelease = osrelease + len; 142 v0 = strtol(osrelease, &sep, 10); 143 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.') 144 return (EINVAL); 145 osrelease = sep + 1; 146 v1 = strtol(osrelease, &sep, 10); 147 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.') 148 return (EINVAL); 149 osrelease = sep + 1; 150 v2 = strtol(osrelease, &sep, 10); 151 if (osrelease == sep || sep != eosrelease) 152 return (EINVAL); 153 154 v = v0 * 1000000 + v1 * 1000 + v2; 155 if (v < 1000000) 156 return (EINVAL); 157 158 if (osrel != NULL) 159 *osrel = v; 160 161 return (0); 162 } 163 164 /* 165 * Find a prison with Linux info. 166 * Return the Linux info and the (locked) prison. 167 */ 168 static struct linux_prison * 169 linux_find_prison(struct prison *spr, struct prison **prp) 170 { 171 struct prison *pr; 172 struct linux_prison *lpr; 173 174 for (pr = spr;; pr = pr->pr_parent) { 175 mtx_lock(&pr->pr_mtx); 176 lpr = (pr == &prison0) 177 ? &lprison0 178 : osd_jail_get(pr, linux_osd_jail_slot); 179 if (lpr != NULL) 180 break; 181 mtx_unlock(&pr->pr_mtx); 182 } 183 *prp = pr; 184 185 return (lpr); 186 } 187 188 /* 189 * Ensure a prison has its own Linux info. If lprp is non-null, point it to 190 * the Linux info and lock the prison. 191 */ 192 static void 193 linux_alloc_prison(struct prison *pr, struct linux_prison **lprp) 194 { 195 struct prison *ppr; 196 struct linux_prison *lpr, *nlpr; 197 void **rsv; 198 199 /* If this prison already has Linux info, return that. */ 200 lpr = linux_find_prison(pr, &ppr); 201 if (ppr == pr) 202 goto done; 203 /* 204 * Allocate a new info record. Then check again, in case something 205 * changed during the allocation. 206 */ 207 mtx_unlock(&ppr->pr_mtx); 208 nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK); 209 rsv = osd_reserve(linux_osd_jail_slot); 210 lpr = linux_find_prison(pr, &ppr); 211 if (ppr == pr) { 212 free(nlpr, M_PRISON); 213 osd_free_reserved(rsv); 214 goto done; 215 } 216 /* Inherit the initial values from the ancestor. */ 217 mtx_lock(&pr->pr_mtx); 218 (void)osd_jail_set_reserved(pr, linux_osd_jail_slot, rsv, nlpr); 219 bcopy(lpr, nlpr, sizeof(*lpr)); 220 lpr = nlpr; 221 mtx_unlock(&ppr->pr_mtx); 222 done: 223 if (lprp != NULL) 224 *lprp = lpr; 225 else 226 mtx_unlock(&pr->pr_mtx); 227 } 228 229 /* 230 * Jail OSD methods for Linux prison data. 231 */ 232 static int 233 linux_prison_create(void *obj, void *data) 234 { 235 struct prison *pr = obj; 236 struct vfsoptlist *opts = data; 237 int jsys; 238 239 if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 && 240 jsys == JAIL_SYS_INHERIT) 241 return (0); 242 /* 243 * Inherit a prison's initial values from its parent 244 * (different from JAIL_SYS_INHERIT which also inherits changes). 245 */ 246 linux_alloc_prison(pr, NULL); 247 return (0); 248 } 249 250 static int 251 linux_prison_check(void *obj __unused, void *data) 252 { 253 struct vfsoptlist *opts = data; 254 char *osname, *osrelease; 255 int error, jsys, len, oss_version; 256 257 /* Check that the parameters are correct. */ 258 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)); 259 if (error != ENOENT) { 260 if (error != 0) 261 return (error); 262 if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT) 263 return (EINVAL); 264 } 265 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len); 266 if (error != ENOENT) { 267 if (error != 0) 268 return (error); 269 if (len == 0 || osname[len - 1] != '\0') 270 return (EINVAL); 271 if (len > LINUX_MAX_UTSNAME) { 272 vfs_opterror(opts, "linux.osname too long"); 273 return (ENAMETOOLONG); 274 } 275 } 276 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len); 277 if (error != ENOENT) { 278 if (error != 0) 279 return (error); 280 if (len == 0 || osrelease[len - 1] != '\0') 281 return (EINVAL); 282 if (len > LINUX_MAX_UTSNAME) { 283 vfs_opterror(opts, "linux.osrelease too long"); 284 return (ENAMETOOLONG); 285 } 286 error = linux_map_osrel(osrelease, NULL); 287 if (error != 0) { 288 vfs_opterror(opts, "linux.osrelease format error"); 289 return (error); 290 } 291 } 292 error = vfs_copyopt(opts, "linux.oss_version", &oss_version, 293 sizeof(oss_version)); 294 295 if (error == ENOENT) 296 error = 0; 297 return (error); 298 } 299 300 static int 301 linux_prison_set(void *obj, void *data) 302 { 303 struct linux_prison *lpr; 304 struct prison *pr = obj; 305 struct vfsoptlist *opts = data; 306 char *osname, *osrelease; 307 int error, gotversion, jsys, len, oss_version; 308 309 /* Set the parameters, which should be correct. */ 310 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)); 311 if (error == ENOENT) 312 jsys = -1; 313 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len); 314 if (error == ENOENT) 315 osname = NULL; 316 else 317 jsys = JAIL_SYS_NEW; 318 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len); 319 if (error == ENOENT) 320 osrelease = NULL; 321 else 322 jsys = JAIL_SYS_NEW; 323 error = vfs_copyopt(opts, "linux.oss_version", &oss_version, 324 sizeof(oss_version)); 325 if (error == ENOENT) 326 gotversion = 0; 327 else { 328 gotversion = 1; 329 jsys = JAIL_SYS_NEW; 330 } 331 switch (jsys) { 332 case JAIL_SYS_INHERIT: 333 /* "linux=inherit": inherit the parent's Linux info. */ 334 mtx_lock(&pr->pr_mtx); 335 osd_jail_del(pr, linux_osd_jail_slot); 336 mtx_unlock(&pr->pr_mtx); 337 break; 338 case JAIL_SYS_NEW: 339 /* 340 * "linux=new" or "linux.*": 341 * the prison gets its own Linux info. 342 */ 343 linux_alloc_prison(pr, &lpr); 344 if (osrelease) { 345 (void)linux_map_osrel(osrelease, &lpr->pr_osrel); 346 strlcpy(lpr->pr_osrelease, osrelease, 347 LINUX_MAX_UTSNAME); 348 } 349 if (osname) 350 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME); 351 if (gotversion) 352 lpr->pr_oss_version = oss_version; 353 mtx_unlock(&pr->pr_mtx); 354 } 355 356 return (0); 357 } 358 359 SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters"); 360 SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME, 361 "Jail Linux kernel OS name"); 362 SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME, 363 "Jail Linux kernel OS release"); 364 SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW, 365 "I", "Jail Linux OSS version"); 366 367 static int 368 linux_prison_get(void *obj, void *data) 369 { 370 struct linux_prison *lpr; 371 struct prison *ppr; 372 struct prison *pr = obj; 373 struct vfsoptlist *opts = data; 374 int error, i; 375 376 static int version0; 377 378 /* See if this prison is the one with the Linux info. */ 379 lpr = linux_find_prison(pr, &ppr); 380 i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 381 error = vfs_setopt(opts, "linux", &i, sizeof(i)); 382 if (error != 0 && error != ENOENT) 383 goto done; 384 if (i) { 385 error = vfs_setopts(opts, "linux.osname", lpr->pr_osname); 386 if (error != 0 && error != ENOENT) 387 goto done; 388 error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease); 389 if (error != 0 && error != ENOENT) 390 goto done; 391 error = vfs_setopt(opts, "linux.oss_version", 392 &lpr->pr_oss_version, sizeof(lpr->pr_oss_version)); 393 if (error != 0 && error != ENOENT) 394 goto done; 395 } else { 396 /* 397 * If this prison is inheriting its Linux info, report 398 * empty/zero parameters. 399 */ 400 error = vfs_setopts(opts, "linux.osname", ""); 401 if (error != 0 && error != ENOENT) 402 goto done; 403 error = vfs_setopts(opts, "linux.osrelease", ""); 404 if (error != 0 && error != ENOENT) 405 goto done; 406 error = vfs_setopt(opts, "linux.oss_version", &version0, 407 sizeof(lpr->pr_oss_version)); 408 if (error != 0 && error != ENOENT) 409 goto done; 410 } 411 error = 0; 412 413 done: 414 mtx_unlock(&ppr->pr_mtx); 415 416 return (error); 417 } 418 419 static void 420 linux_prison_destructor(void *data) 421 { 422 423 free(data, M_PRISON); 424 } 425 426 void 427 linux_osd_jail_register(void) 428 { 429 struct prison *pr; 430 osd_method_t methods[PR_MAXMETHOD] = { 431 [PR_METHOD_CREATE] = linux_prison_create, 432 [PR_METHOD_GET] = linux_prison_get, 433 [PR_METHOD_SET] = linux_prison_set, 434 [PR_METHOD_CHECK] = linux_prison_check 435 }; 436 437 linux_osd_jail_slot = 438 osd_jail_register(linux_prison_destructor, methods); 439 /* Copy the system linux info to any current prisons. */ 440 sx_slock(&allprison_lock); 441 TAILQ_FOREACH(pr, &allprison, pr_list) 442 linux_alloc_prison(pr, NULL); 443 sx_sunlock(&allprison_lock); 444 } 445 446 void 447 linux_osd_jail_deregister(void) 448 { 449 450 osd_jail_deregister(linux_osd_jail_slot); 451 } 452 453 void 454 linux_get_osname(struct thread *td, char *dst) 455 { 456 struct prison *pr; 457 struct linux_prison *lpr; 458 459 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 460 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME); 461 mtx_unlock(&pr->pr_mtx); 462 } 463 464 static int 465 linux_set_osname(struct thread *td, char *osname) 466 { 467 struct prison *pr; 468 struct linux_prison *lpr; 469 470 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 471 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME); 472 mtx_unlock(&pr->pr_mtx); 473 474 return (0); 475 } 476 477 void 478 linux_get_osrelease(struct thread *td, char *dst) 479 { 480 struct prison *pr; 481 struct linux_prison *lpr; 482 483 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 484 bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME); 485 mtx_unlock(&pr->pr_mtx); 486 } 487 488 int 489 linux_kernver(struct thread *td) 490 { 491 struct prison *pr; 492 struct linux_prison *lpr; 493 int osrel; 494 495 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 496 osrel = lpr->pr_osrel; 497 mtx_unlock(&pr->pr_mtx); 498 499 return (osrel); 500 } 501 502 static int 503 linux_set_osrelease(struct thread *td, char *osrelease) 504 { 505 struct prison *pr; 506 struct linux_prison *lpr; 507 int error; 508 509 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 510 error = linux_map_osrel(osrelease, &lpr->pr_osrel); 511 if (error == 0) 512 strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME); 513 mtx_unlock(&pr->pr_mtx); 514 515 return (error); 516 } 517 518 int 519 linux_get_oss_version(struct thread *td) 520 { 521 struct prison *pr; 522 struct linux_prison *lpr; 523 int version; 524 525 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 526 version = lpr->pr_oss_version; 527 mtx_unlock(&pr->pr_mtx); 528 529 return (version); 530 } 531 532 static int 533 linux_set_oss_version(struct thread *td, int oss_version) 534 { 535 struct prison *pr; 536 struct linux_prison *lpr; 537 538 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 539 lpr->pr_oss_version = oss_version; 540 mtx_unlock(&pr->pr_mtx); 541 542 return (0); 543 } 544