1 /*- 2 * Copyright (c) 1999 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/sdt.h> 35 #include <sys/systm.h> 36 #include <sys/sysctl.h> 37 #include <sys/proc.h> 38 #include <sys/malloc.h> 39 #include <sys/mount.h> 40 #include <sys/jail.h> 41 #include <sys/lock.h> 42 #include <sys/sx.h> 43 44 #include <compat/linux/linux_mib.h> 45 #include <compat/linux/linux_misc.h> 46 47 struct linux_prison { 48 char pr_osname[LINUX_MAX_UTSNAME]; 49 char pr_osrelease[LINUX_MAX_UTSNAME]; 50 int pr_oss_version; 51 int pr_osrel; 52 }; 53 54 static struct linux_prison lprison0 = { 55 .pr_osname = "Linux", 56 .pr_osrelease = LINUX_VERSION_STR, 57 .pr_oss_version = 0x030600, 58 .pr_osrel = LINUX_VERSION_CODE 59 }; 60 61 static unsigned linux_osd_jail_slot; 62 63 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0, "Linux mode"); 64 65 static int linux_set_osname(struct thread *td, char *osname); 66 static int linux_set_osrelease(struct thread *td, char *osrelease); 67 static int linux_set_oss_version(struct thread *td, int oss_version); 68 69 static int 70 linux_sysctl_osname(SYSCTL_HANDLER_ARGS) 71 { 72 char osname[LINUX_MAX_UTSNAME]; 73 int error; 74 75 linux_get_osname(req->td, osname); 76 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req); 77 if (error != 0 || req->newptr == NULL) 78 return (error); 79 error = linux_set_osname(req->td, osname); 80 81 return (error); 82 } 83 84 SYSCTL_PROC(_compat_linux, OID_AUTO, osname, 85 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 86 0, 0, linux_sysctl_osname, "A", 87 "Linux kernel OS name"); 88 89 static int 90 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS) 91 { 92 char osrelease[LINUX_MAX_UTSNAME]; 93 int error; 94 95 linux_get_osrelease(req->td, osrelease); 96 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req); 97 if (error != 0 || req->newptr == NULL) 98 return (error); 99 error = linux_set_osrelease(req->td, osrelease); 100 101 return (error); 102 } 103 104 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease, 105 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 106 0, 0, linux_sysctl_osrelease, "A", 107 "Linux kernel OS release"); 108 109 static int 110 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS) 111 { 112 int oss_version; 113 int error; 114 115 oss_version = linux_get_oss_version(req->td); 116 error = sysctl_handle_int(oidp, &oss_version, 0, req); 117 if (error != 0 || req->newptr == NULL) 118 return (error); 119 error = linux_set_oss_version(req->td, oss_version); 120 121 return (error); 122 } 123 124 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version, 125 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE, 126 0, 0, linux_sysctl_oss_version, "I", 127 "Linux OSS version"); 128 129 /* 130 * Map the osrelease into integer 131 */ 132 static int 133 linux_map_osrel(char *osrelease, int *osrel) 134 { 135 char *sep, *eosrelease; 136 int len, v0, v1, v2, v; 137 138 len = strlen(osrelease); 139 eosrelease = osrelease + len; 140 v0 = strtol(osrelease, &sep, 10); 141 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.') 142 return (EINVAL); 143 osrelease = sep + 1; 144 v1 = strtol(osrelease, &sep, 10); 145 if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.') 146 return (EINVAL); 147 osrelease = sep + 1; 148 v2 = strtol(osrelease, &sep, 10); 149 if (osrelease == sep || sep != eosrelease) 150 return (EINVAL); 151 152 v = v0 * 1000000 + v1 * 1000 + v2; 153 if (v < 1000000) 154 return (EINVAL); 155 156 if (osrel != NULL) 157 *osrel = v; 158 159 return (0); 160 } 161 162 /* 163 * Find a prison with Linux info. 164 * Return the Linux info and the (locked) prison. 165 */ 166 static struct linux_prison * 167 linux_find_prison(struct prison *spr, struct prison **prp) 168 { 169 struct prison *pr; 170 struct linux_prison *lpr; 171 172 for (pr = spr;; pr = pr->pr_parent) { 173 mtx_lock(&pr->pr_mtx); 174 lpr = (pr == &prison0) 175 ? &lprison0 176 : osd_jail_get(pr, linux_osd_jail_slot); 177 if (lpr != NULL) 178 break; 179 mtx_unlock(&pr->pr_mtx); 180 } 181 *prp = pr; 182 183 return (lpr); 184 } 185 186 /* 187 * Ensure a prison has its own Linux info. If lprp is non-null, point it to 188 * the Linux info and lock the prison. 189 */ 190 static void 191 linux_alloc_prison(struct prison *pr, struct linux_prison **lprp) 192 { 193 struct prison *ppr; 194 struct linux_prison *lpr, *nlpr; 195 void **rsv; 196 197 /* If this prison already has Linux info, return that. */ 198 lpr = linux_find_prison(pr, &ppr); 199 if (ppr == pr) 200 goto done; 201 /* 202 * Allocate a new info record. Then check again, in case something 203 * changed during the allocation. 204 */ 205 mtx_unlock(&ppr->pr_mtx); 206 nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK); 207 rsv = osd_reserve(linux_osd_jail_slot); 208 lpr = linux_find_prison(pr, &ppr); 209 if (ppr == pr) { 210 free(nlpr, M_PRISON); 211 osd_free_reserved(rsv); 212 goto done; 213 } 214 /* Inherit the initial values from the ancestor. */ 215 mtx_lock(&pr->pr_mtx); 216 (void)osd_jail_set_reserved(pr, linux_osd_jail_slot, rsv, nlpr); 217 bcopy(lpr, nlpr, sizeof(*lpr)); 218 lpr = nlpr; 219 mtx_unlock(&ppr->pr_mtx); 220 done: 221 if (lprp != NULL) 222 *lprp = lpr; 223 else 224 mtx_unlock(&pr->pr_mtx); 225 } 226 227 /* 228 * Jail OSD methods for Linux prison data. 229 */ 230 static int 231 linux_prison_create(void *obj, void *data) 232 { 233 struct prison *pr = obj; 234 struct vfsoptlist *opts = data; 235 int jsys; 236 237 if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 && 238 jsys == JAIL_SYS_INHERIT) 239 return (0); 240 /* 241 * Inherit a prison's initial values from its parent 242 * (different from JAIL_SYS_INHERIT which also inherits changes). 243 */ 244 linux_alloc_prison(pr, NULL); 245 return (0); 246 } 247 248 static int 249 linux_prison_check(void *obj __unused, void *data) 250 { 251 struct vfsoptlist *opts = data; 252 char *osname, *osrelease; 253 int error, jsys, len, oss_version; 254 255 /* Check that the parameters are correct. */ 256 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)); 257 if (error != ENOENT) { 258 if (error != 0) 259 return (error); 260 if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT) 261 return (EINVAL); 262 } 263 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len); 264 if (error != ENOENT) { 265 if (error != 0) 266 return (error); 267 if (len == 0 || osname[len - 1] != '\0') 268 return (EINVAL); 269 if (len > LINUX_MAX_UTSNAME) { 270 vfs_opterror(opts, "linux.osname too long"); 271 return (ENAMETOOLONG); 272 } 273 } 274 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len); 275 if (error != ENOENT) { 276 if (error != 0) 277 return (error); 278 if (len == 0 || osrelease[len - 1] != '\0') 279 return (EINVAL); 280 if (len > LINUX_MAX_UTSNAME) { 281 vfs_opterror(opts, "linux.osrelease too long"); 282 return (ENAMETOOLONG); 283 } 284 error = linux_map_osrel(osrelease, NULL); 285 if (error != 0) { 286 vfs_opterror(opts, "linux.osrelease format error"); 287 return (error); 288 } 289 } 290 error = vfs_copyopt(opts, "linux.oss_version", &oss_version, 291 sizeof(oss_version)); 292 293 if (error == ENOENT) 294 error = 0; 295 return (error); 296 } 297 298 static int 299 linux_prison_set(void *obj, void *data) 300 { 301 struct linux_prison *lpr; 302 struct prison *pr = obj; 303 struct vfsoptlist *opts = data; 304 char *osname, *osrelease; 305 int error, gotversion, jsys, len, oss_version; 306 307 /* Set the parameters, which should be correct. */ 308 error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)); 309 if (error == ENOENT) 310 jsys = -1; 311 error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len); 312 if (error == ENOENT) 313 osname = NULL; 314 else 315 jsys = JAIL_SYS_NEW; 316 error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len); 317 if (error == ENOENT) 318 osrelease = NULL; 319 else 320 jsys = JAIL_SYS_NEW; 321 error = vfs_copyopt(opts, "linux.oss_version", &oss_version, 322 sizeof(oss_version)); 323 if (error == ENOENT) 324 gotversion = 0; 325 else { 326 gotversion = 1; 327 jsys = JAIL_SYS_NEW; 328 } 329 switch (jsys) { 330 case JAIL_SYS_INHERIT: 331 /* "linux=inherit": inherit the parent's Linux info. */ 332 mtx_lock(&pr->pr_mtx); 333 osd_jail_del(pr, linux_osd_jail_slot); 334 mtx_unlock(&pr->pr_mtx); 335 break; 336 case JAIL_SYS_NEW: 337 /* 338 * "linux=new" or "linux.*": 339 * the prison gets its own Linux info. 340 */ 341 linux_alloc_prison(pr, &lpr); 342 if (osrelease) { 343 (void)linux_map_osrel(osrelease, &lpr->pr_osrel); 344 strlcpy(lpr->pr_osrelease, osrelease, 345 LINUX_MAX_UTSNAME); 346 } 347 if (osname) 348 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME); 349 if (gotversion) 350 lpr->pr_oss_version = oss_version; 351 mtx_unlock(&pr->pr_mtx); 352 } 353 354 return (0); 355 } 356 357 SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters"); 358 SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME, 359 "Jail Linux kernel OS name"); 360 SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME, 361 "Jail Linux kernel OS release"); 362 SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW, 363 "I", "Jail Linux OSS version"); 364 365 static int 366 linux_prison_get(void *obj, void *data) 367 { 368 struct linux_prison *lpr; 369 struct prison *ppr; 370 struct prison *pr = obj; 371 struct vfsoptlist *opts = data; 372 int error, i; 373 374 static int version0; 375 376 /* See if this prison is the one with the Linux info. */ 377 lpr = linux_find_prison(pr, &ppr); 378 i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 379 error = vfs_setopt(opts, "linux", &i, sizeof(i)); 380 if (error != 0 && error != ENOENT) 381 goto done; 382 if (i) { 383 error = vfs_setopts(opts, "linux.osname", lpr->pr_osname); 384 if (error != 0 && error != ENOENT) 385 goto done; 386 error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease); 387 if (error != 0 && error != ENOENT) 388 goto done; 389 error = vfs_setopt(opts, "linux.oss_version", 390 &lpr->pr_oss_version, sizeof(lpr->pr_oss_version)); 391 if (error != 0 && error != ENOENT) 392 goto done; 393 } else { 394 /* 395 * If this prison is inheriting its Linux info, report 396 * empty/zero parameters. 397 */ 398 error = vfs_setopts(opts, "linux.osname", ""); 399 if (error != 0 && error != ENOENT) 400 goto done; 401 error = vfs_setopts(opts, "linux.osrelease", ""); 402 if (error != 0 && error != ENOENT) 403 goto done; 404 error = vfs_setopt(opts, "linux.oss_version", &version0, 405 sizeof(lpr->pr_oss_version)); 406 if (error != 0 && error != ENOENT) 407 goto done; 408 } 409 error = 0; 410 411 done: 412 mtx_unlock(&ppr->pr_mtx); 413 414 return (error); 415 } 416 417 static void 418 linux_prison_destructor(void *data) 419 { 420 421 free(data, M_PRISON); 422 } 423 424 void 425 linux_osd_jail_register(void) 426 { 427 struct prison *pr; 428 osd_method_t methods[PR_MAXMETHOD] = { 429 [PR_METHOD_CREATE] = linux_prison_create, 430 [PR_METHOD_GET] = linux_prison_get, 431 [PR_METHOD_SET] = linux_prison_set, 432 [PR_METHOD_CHECK] = linux_prison_check 433 }; 434 435 linux_osd_jail_slot = 436 osd_jail_register(linux_prison_destructor, methods); 437 /* Copy the system linux info to any current prisons. */ 438 sx_slock(&allprison_lock); 439 TAILQ_FOREACH(pr, &allprison, pr_list) 440 linux_alloc_prison(pr, NULL); 441 sx_sunlock(&allprison_lock); 442 } 443 444 void 445 linux_osd_jail_deregister(void) 446 { 447 448 osd_jail_deregister(linux_osd_jail_slot); 449 } 450 451 void 452 linux_get_osname(struct thread *td, char *dst) 453 { 454 struct prison *pr; 455 struct linux_prison *lpr; 456 457 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 458 bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME); 459 mtx_unlock(&pr->pr_mtx); 460 } 461 462 static int 463 linux_set_osname(struct thread *td, char *osname) 464 { 465 struct prison *pr; 466 struct linux_prison *lpr; 467 468 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 469 strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME); 470 mtx_unlock(&pr->pr_mtx); 471 472 return (0); 473 } 474 475 void 476 linux_get_osrelease(struct thread *td, char *dst) 477 { 478 struct prison *pr; 479 struct linux_prison *lpr; 480 481 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 482 bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME); 483 mtx_unlock(&pr->pr_mtx); 484 } 485 486 int 487 linux_kernver(struct thread *td) 488 { 489 struct prison *pr; 490 struct linux_prison *lpr; 491 int osrel; 492 493 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 494 osrel = lpr->pr_osrel; 495 mtx_unlock(&pr->pr_mtx); 496 497 return (osrel); 498 } 499 500 static int 501 linux_set_osrelease(struct thread *td, char *osrelease) 502 { 503 struct prison *pr; 504 struct linux_prison *lpr; 505 int error; 506 507 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 508 error = linux_map_osrel(osrelease, &lpr->pr_osrel); 509 if (error == 0) 510 strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME); 511 mtx_unlock(&pr->pr_mtx); 512 513 return (error); 514 } 515 516 int 517 linux_get_oss_version(struct thread *td) 518 { 519 struct prison *pr; 520 struct linux_prison *lpr; 521 int version; 522 523 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 524 version = lpr->pr_oss_version; 525 mtx_unlock(&pr->pr_mtx); 526 527 return (version); 528 } 529 530 static int 531 linux_set_oss_version(struct thread *td, int oss_version) 532 { 533 struct prison *pr; 534 struct linux_prison *lpr; 535 536 lpr = linux_find_prison(td->td_ucred->cr_prison, &pr); 537 lpr->pr_oss_version = oss_version; 538 mtx_unlock(&pr->pr_mtx); 539 540 return (0); 541 } 542