1 /* $NetBSD: procfs_vfsops.c,v 1.120 2024/09/14 01:37:42 pgoyette Exp $ */ 2 3 /* 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 35 */ 36 37 /* 38 * Copyright (c) 1993 Jan-Simon Pendry 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Jan-Simon Pendry. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 72 */ 73 74 /* 75 * procfs VFS interface 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.120 2024/09/14 01:37:42 pgoyette Exp $"); 80 81 #if defined(_KERNEL_OPT) 82 #include "opt_compat_netbsd.h" 83 #include "opt_sysv_ipc.h" 84 #include "opt_mqueue.h" 85 #endif 86 87 #include <sys/param.h> 88 #include <sys/atomic.h> 89 #include <sys/buf.h> 90 #include <sys/dirent.h> 91 #include <sys/file.h> 92 #include <sys/filedesc.h> 93 #include <sys/fstrans.h> 94 #include <sys/kauth.h> 95 #include <sys/kernel.h> 96 #include <sys/module.h> 97 #include <sys/mount.h> 98 #include <sys/proc.h> 99 #include <sys/signalvar.h> 100 #include <sys/sysctl.h> 101 #include <sys/syslog.h> 102 #include <sys/systm.h> 103 #include <sys/time.h> 104 #include <sys/vnode.h> 105 106 #include <miscfs/genfs/genfs.h> 107 108 #include <miscfs/procfs/procfs.h> 109 110 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 111 112 MODULE(MODULE_CLASS_VFS, procfs, "ptrace_common" 113 #if defined(MQUEUE) 114 ",mqueue" 115 #endif 116 #if defined(SYSVSHM) || defined(SYSVSEM) || defined(SYSVMSG) 117 ",sysv_ipc" 118 #endif 119 ); 120 121 VFS_PROTOS(procfs); 122 123 #define PROCFS_HASHSIZE 256 124 #define PROCFS_EXEC_HOOK ((void *)1) 125 #define PROCFS_EXIT_HOOK ((void *)2) 126 127 static kauth_listener_t procfs_listener; 128 static void *procfs_exechook; 129 static void *procfs_exithook; 130 LIST_HEAD(hashhead, pfsnode); 131 static u_long procfs_hashmask; 132 static struct hashhead *procfs_hashtab; 133 static kmutex_t procfs_hashlock; 134 135 static struct hashhead * 136 procfs_hashhead(pid_t pid) 137 { 138 139 return &procfs_hashtab[pid & procfs_hashmask]; 140 } 141 142 void 143 procfs_hashrem(struct pfsnode *pfs) 144 { 145 146 mutex_enter(&procfs_hashlock); 147 LIST_REMOVE(pfs, pfs_hash); 148 mutex_exit(&procfs_hashlock); 149 } 150 151 /* 152 * VFS Operations. 153 * 154 * mount system call 155 */ 156 /* ARGSUSED */ 157 int 158 procfs_mount( 159 struct mount *mp, 160 const char *path, 161 void *data, 162 size_t *data_len) 163 { 164 struct lwp *l = curlwp; 165 struct procfsmount *pmnt; 166 struct procfs_args *args = data; 167 int error; 168 169 if (args == NULL) 170 return EINVAL; 171 172 if (UIO_MX & (UIO_MX-1)) { 173 log(LOG_ERR, "procfs: invalid directory entry size"); 174 return (EINVAL); 175 } 176 177 if (mp->mnt_flag & MNT_GETARGS) { 178 if (*data_len < sizeof *args) 179 return EINVAL; 180 181 pmnt = VFSTOPROC(mp); 182 if (pmnt == NULL) 183 return EIO; 184 args->version = PROCFS_ARGSVERSION; 185 args->flags = pmnt->pmnt_flags; 186 *data_len = sizeof *args; 187 return 0; 188 } 189 190 if (mp->mnt_flag & MNT_UPDATE) 191 return (EOPNOTSUPP); 192 193 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 194 return EINVAL; 195 196 pmnt = kmem_zalloc(sizeof(struct procfsmount), KM_SLEEP); 197 198 mp->mnt_stat.f_namemax = PROCFS_MAXNAMLEN; 199 mp->mnt_flag |= MNT_LOCAL; 200 mp->mnt_data = pmnt; 201 vfs_getnewfsid(mp); 202 203 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 204 mp->mnt_op->vfs_name, mp, l); 205 if (*data_len >= sizeof *args) 206 pmnt->pmnt_flags = args->flags; 207 else 208 pmnt->pmnt_flags = 0; 209 210 mp->mnt_iflag |= IMNT_MPSAFE | IMNT_SHRLOOKUP; 211 return error; 212 } 213 214 /* 215 * unmount system call 216 */ 217 int 218 procfs_unmount(struct mount *mp, int mntflags) 219 { 220 int error; 221 int flags = 0; 222 223 if (mntflags & MNT_FORCE) 224 flags |= FORCECLOSE; 225 226 if ((error = vflush(mp, 0, flags)) != 0) 227 return (error); 228 229 kmem_free(mp->mnt_data, sizeof(struct procfsmount)); 230 mp->mnt_data = NULL; 231 232 return 0; 233 } 234 235 int 236 procfs_root(struct mount *mp, int lktype, struct vnode **vpp) 237 { 238 int error; 239 240 error = procfs_allocvp(mp, vpp, 0, PFSroot, -1); 241 if (error == 0) { 242 error = vn_lock(*vpp, lktype); 243 if (error != 0) { 244 vrele(*vpp); 245 *vpp = NULL; 246 } 247 } 248 249 return error; 250 } 251 252 /* ARGSUSED */ 253 int 254 procfs_start(struct mount *mp, int flags) 255 { 256 257 return (0); 258 } 259 260 /* 261 * Get file system statistics. 262 */ 263 int 264 procfs_statvfs(struct mount *mp, struct statvfs *sbp) 265 { 266 267 genfs_statvfs(mp, sbp); 268 269 sbp->f_bsize = PAGE_SIZE; 270 sbp->f_frsize = PAGE_SIZE; 271 sbp->f_iosize = PAGE_SIZE; 272 sbp->f_blocks = 1; 273 sbp->f_files = maxproc; /* approx */ 274 sbp->f_ffree = maxproc - atomic_load_relaxed(&nprocs); /* approx */ 275 sbp->f_favail = maxproc - atomic_load_relaxed(&nprocs); /* approx */ 276 277 return (0); 278 } 279 280 /*ARGSUSED*/ 281 int 282 procfs_sync( 283 struct mount *mp, 284 int waitfor, 285 kauth_cred_t uc) 286 { 287 288 return (0); 289 } 290 291 /*ARGSUSED*/ 292 int 293 procfs_vget(struct mount *mp, ino_t ino, int lktype, 294 struct vnode **vpp) 295 { 296 return (EOPNOTSUPP); 297 } 298 299 int 300 procfs_loadvnode(struct mount *mp, struct vnode *vp, 301 const void *key, size_t key_len, const void **new_key) 302 { 303 int error; 304 struct pfskey pfskey; 305 struct pfsnode *pfs; 306 307 KASSERT(key_len == sizeof(pfskey)); 308 memcpy(&pfskey, key, key_len); 309 310 pfs = kmem_alloc(sizeof(*pfs), KM_SLEEP); 311 pfs->pfs_pid = pfskey.pk_pid; 312 pfs->pfs_type = pfskey.pk_type; 313 pfs->pfs_fd = pfskey.pk_fd; 314 pfs->pfs_vnode = vp; 315 pfs->pfs_mount = mp; 316 pfs->pfs_flags = 0; 317 pfs->pfs_fileno = 318 PROCFS_FILENO(pfs->pfs_pid, pfs->pfs_type, pfs->pfs_fd); 319 vp->v_tag = VT_PROCFS; 320 vp->v_op = procfs_vnodeop_p; 321 vp->v_data = pfs; 322 323 switch (pfs->pfs_type) { 324 case PFSroot: /* /proc = dr-xr-xr-x */ 325 vp->v_vflag |= VV_ROOT; 326 /*FALLTHROUGH*/ 327 case PFSproc: /* /proc/N = dr-xr-xr-x */ 328 pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 329 vp->v_type = VDIR; 330 break; 331 332 case PFStask: /* /proc/N/task = dr-xr-xr-x */ 333 if (pfs->pfs_fd == -1) { 334 pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP| 335 S_IROTH|S_IXOTH; 336 vp->v_type = VDIR; 337 break; 338 } 339 /*FALLTHROUGH*/ 340 case PFScurproc: /* /proc/curproc = lr-xr-xr-x */ 341 case PFSself: /* /proc/self = lr-xr-xr-x */ 342 case PFScwd: /* /proc/N/cwd = lr-xr-xr-x */ 343 case PFSchroot: /* /proc/N/chroot = lr-xr-xr-x */ 344 case PFSexe: /* /proc/N/exe = lr-xr-xr-x */ 345 pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 346 vp->v_type = VLNK; 347 break; 348 349 case PFSfd: 350 if (pfs->pfs_fd == -1) { /* /proc/N/fd = dr-x------ */ 351 pfs->pfs_mode = S_IRUSR|S_IXUSR; 352 vp->v_type = VDIR; 353 } else { /* /proc/N/fd/M = [ps-]rw------- */ 354 file_t *fp; 355 vnode_t *vxp; 356 struct proc *p; 357 358 mutex_enter(&proc_lock); 359 p = procfs_proc_find(mp, pfs->pfs_pid); 360 mutex_exit(&proc_lock); 361 if (p == NULL) { 362 error = ENOENT; 363 goto bad; 364 } 365 KASSERT(rw_read_held(&p->p_reflock)); 366 if ((fp = fd_getfile2(p, pfs->pfs_fd)) == NULL) { 367 error = EBADF; 368 goto bad; 369 } 370 371 pfs->pfs_mode = S_IRUSR|S_IWUSR; 372 switch (fp->f_type) { 373 case DTYPE_VNODE: 374 vxp = fp->f_vnode; 375 376 /* 377 * We make symlinks for directories 378 * to avoid cycles. 379 */ 380 if (vxp->v_type == VDIR || 381 procfs_proc_is_linux_compat()) 382 goto symlink; 383 vp->v_type = vxp->v_type; 384 break; 385 case DTYPE_PIPE: 386 vp->v_type = VFIFO; 387 break; 388 case DTYPE_SOCKET: 389 vp->v_type = VSOCK; 390 break; 391 case DTYPE_KQUEUE: 392 case DTYPE_MISC: 393 case DTYPE_SEM: 394 symlink: 395 pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP| 396 S_IXGRP|S_IROTH|S_IXOTH; 397 vp->v_type = VLNK; 398 break; 399 default: 400 error = EOPNOTSUPP; 401 closef(fp); 402 goto bad; 403 } 404 closef(fp); 405 } 406 break; 407 408 case PFSfile: /* /proc/N/file = -rw------- */ 409 case PFSmem: /* /proc/N/mem = -rw------- */ 410 case PFSregs: /* /proc/N/regs = -rw------- */ 411 case PFSfpregs: /* /proc/N/fpregs = -rw------- */ 412 pfs->pfs_mode = S_IRUSR|S_IWUSR; 413 vp->v_type = VREG; 414 break; 415 416 case PFSnote: /* /proc/N/note = --w------ */ 417 case PFSnotepg: /* /proc/N/notepg = --w------ */ 418 pfs->pfs_mode = S_IWUSR; 419 vp->v_type = VREG; 420 break; 421 422 case PFSmap: /* /proc/N/map = -r-------- */ 423 case PFSmaps: /* /proc/N/maps = -r-------- */ 424 case PFSauxv: /* /proc/N/auxv = -r-------- */ 425 case PFSenviron: /* /proc/N/environ = -r-------- */ 426 pfs->pfs_mode = S_IRUSR; 427 vp->v_type = VREG; 428 break; 429 430 case PFSstatus: /* /proc/N/status = -r--r--r-- */ 431 case PFSstat: /* /proc/N/stat = -r--r--r-- */ 432 case PFScmdline: /* /proc/N/cmdline = -r--r--r-- */ 433 case PFSemul: /* /proc/N/emul = -r--r--r-- */ 434 case PFSmeminfo: /* /proc/meminfo = -r--r--r-- */ 435 case PFScpustat: /* /proc/stat = -r--r--r-- */ 436 case PFSdevices: /* /proc/devices = -r--r--r-- */ 437 case PFScpuinfo: /* /proc/cpuinfo = -r--r--r-- */ 438 case PFSuptime: /* /proc/uptime = -r--r--r-- */ 439 case PFSmounts: /* /proc/mounts = -r--r--r-- */ 440 case PFSloadavg: /* /proc/loadavg = -r--r--r-- */ 441 case PFSstatm: /* /proc/N/statm = -r--r--r-- */ 442 case PFSversion: /* /proc/version = -r--r--r-- */ 443 case PFSlimit: /* /proc/N/limit = -r--r--r-- */ 444 case PFSlimits: /* /proc/N/limits = -r--r--r-- */ 445 pfs->pfs_mode = S_IRUSR|S_IRGRP|S_IROTH; 446 vp->v_type = VREG; 447 break; 448 449 case PFSsys: /* /proc/sys = dr-xr-xr-x */ 450 case PFSsysfs: /* /proc/sys/fs = dr-xr-xr-x */ 451 case PFSmqueue: /* /proc/sys/fs/mqueue = dr-xr-xr-x */ 452 case PFSsysvipc:/* /proc/sysvipc = dr-xr-xr-x */ 453 if (pfs->pfs_fd == -1) { 454 pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP| 455 S_IROTH|S_IXOTH; 456 vp->v_type = VDIR; 457 break; 458 } 459 /*FALLTHROUGH*/ 460 case PFSmq_msg_def: /* /proc/sys/fs/mqueue/msg_default = -r--r--r-- */ 461 case PFSmq_msg_max: /* /proc/sys/fs/mqueue/msg_max = -r--r--r-- */ 462 case PFSmq_siz_def: /* /proc/sys/fs/mqueue/msgsize_default = -r--r--r-- */ 463 case PFSmq_siz_max: /* /proc/sys/fs/mqueue/msgsize_max = -r--r--r-- */ 464 case PFSmq_qmax: /* /proc/sys/fs/mqueue/queues_max = -r--r--r-- */ 465 case PFSsysvipc_msg: /* /proc/sysvipc/msg = -r--r--r-- */ 466 case PFSsysvipc_sem: /* /proc/sysvipc/sem = -r--r--r-- */ 467 case PFSsysvipc_shm: /* /proc/sysvipc/shm = -r--r--r-- */ 468 pfs->pfs_mode = S_IRUSR|S_IRGRP|S_IROTH; 469 vp->v_type = VREG; 470 break; 471 472 #ifdef __HAVE_PROCFS_MACHDEP 473 PROCFS_MACHDEP_NODETYPE_CASES 474 procfs_machdep_allocvp(vp); 475 break; 476 #endif 477 478 default: 479 panic("procfs_allocvp"); 480 } 481 482 mutex_enter(&procfs_hashlock); 483 LIST_INSERT_HEAD(procfs_hashhead(pfs->pfs_pid), pfs, pfs_hash); 484 mutex_exit(&procfs_hashlock); 485 486 uvm_vnp_setsize(vp, 0); 487 *new_key = &pfs->pfs_key; 488 489 return 0; 490 491 bad: 492 vp->v_tag =VT_NON; 493 vp->v_type = VNON; 494 vp->v_op = NULL; 495 vp->v_data = NULL; 496 kmem_free(pfs, sizeof(*pfs)); 497 return error; 498 } 499 500 void 501 procfs_init(void) 502 { 503 504 } 505 506 void 507 procfs_reinit(void) 508 { 509 510 } 511 512 void 513 procfs_done(void) 514 { 515 516 } 517 518 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 519 520 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 521 &procfs_vnodeop_opv_desc, 522 NULL, 523 }; 524 525 struct vfsops procfs_vfsops = { 526 .vfs_name = MOUNT_PROCFS, 527 .vfs_min_mount_data = sizeof (struct procfs_args), 528 .vfs_mount = procfs_mount, 529 .vfs_start = procfs_start, 530 .vfs_unmount = procfs_unmount, 531 .vfs_root = procfs_root, 532 .vfs_quotactl = (void *)eopnotsupp, 533 .vfs_statvfs = procfs_statvfs, 534 .vfs_sync = procfs_sync, 535 .vfs_vget = procfs_vget, 536 .vfs_loadvnode = procfs_loadvnode, 537 .vfs_fhtovp = (void *)eopnotsupp, 538 .vfs_vptofh = (void *)eopnotsupp, 539 .vfs_init = procfs_init, 540 .vfs_reinit = procfs_reinit, 541 .vfs_done = procfs_done, 542 .vfs_snapshot = (void *)eopnotsupp, 543 .vfs_extattrctl = vfs_stdextattrctl, 544 .vfs_suspendctl = genfs_suspendctl, 545 .vfs_renamelock_enter = genfs_renamelock_enter, 546 .vfs_renamelock_exit = genfs_renamelock_exit, 547 .vfs_fsync = (void *)eopnotsupp, 548 .vfs_opv_descs = procfs_vnodeopv_descs 549 }; 550 551 static void 552 procfs_exechook_cb(struct proc *p, void *arg) 553 { 554 struct hashhead *head; 555 struct pfsnode *pfs; 556 struct mount *mp; 557 struct pfskey key; 558 struct vnode *vp; 559 int error; 560 561 if (arg == PROCFS_EXEC_HOOK && !(p->p_flag & PK_SUGID)) 562 return; 563 564 head = procfs_hashhead(p->p_pid); 565 566 again: 567 mutex_enter(&procfs_hashlock); 568 LIST_FOREACH(pfs, head, pfs_hash) { 569 if (pfs->pfs_pid != p->p_pid) 570 continue; 571 mp = pfs->pfs_mount; 572 key = pfs->pfs_key; 573 vfs_ref(mp); 574 mutex_exit(&procfs_hashlock); 575 576 error = vcache_get(mp, &key, sizeof(key), &vp); 577 vfs_rele(mp); 578 if (error != 0) 579 goto again; 580 if (vrecycle(vp)) 581 goto again; 582 do { 583 error = vfs_suspend(mp, 0); 584 } while (error == EINTR || error == ERESTART); 585 vgone(vp); 586 if (error == 0) 587 vfs_resume(mp); 588 goto again; 589 } 590 mutex_exit(&procfs_hashlock); 591 } 592 593 static int 594 procfs_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 595 void *arg0, void *arg1, void *arg2, void *arg3) 596 { 597 struct proc *p; 598 struct pfsnode *pfs; 599 int result; 600 601 result = KAUTH_RESULT_DEFER; 602 p = arg0; 603 pfs = arg1; 604 605 if (action != KAUTH_PROCESS_PROCFS) 606 return result; 607 608 switch (pfs->pfs_type) { 609 case PFSregs: 610 case PFSfpregs: 611 case PFSmem: 612 if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || 613 ISSET(p->p_flag, PK_SUGID)) 614 break; 615 616 /*FALLTHROUGH*/ 617 default: 618 result = KAUTH_RESULT_ALLOW; 619 break; 620 } 621 622 return result; 623 } 624 625 SYSCTL_SETUP(procfs_sysctl_setup, "procfs sysctl") 626 { 627 628 sysctl_createv(clog, 0, NULL, NULL, 629 CTLFLAG_PERMANENT, 630 CTLTYPE_NODE, "procfs", 631 SYSCTL_DESCR("Process file system"), 632 NULL, 0, NULL, 0, 633 CTL_VFS, 12, CTL_EOL); 634 /* 635 * XXX the "12" above could be dynamic, thereby eliminating 636 * one more instance of the "number to vfs" mapping problem, 637 * but "12" is the order as taken from sys/mount.h 638 */ 639 } 640 641 static int 642 procfs_modcmd(modcmd_t cmd, void *arg) 643 { 644 int error; 645 646 switch (cmd) { 647 case MODULE_CMD_INIT: 648 error = vfs_attach(&procfs_vfsops); 649 if (error != 0) 650 break; 651 652 procfs_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, 653 procfs_listener_cb, NULL); 654 655 procfs_exechook = exechook_establish(procfs_exechook_cb, 656 PROCFS_EXEC_HOOK); 657 procfs_exithook = exithook_establish(procfs_exechook_cb, 658 PROCFS_EXIT_HOOK); 659 660 mutex_init(&procfs_hashlock, MUTEX_DEFAULT, IPL_NONE); 661 procfs_hashtab = hashinit(PROCFS_HASHSIZE, HASH_LIST, true, 662 &procfs_hashmask); 663 664 break; 665 case MODULE_CMD_FINI: 666 error = vfs_detach(&procfs_vfsops); 667 if (error != 0) 668 break; 669 kauth_unlisten_scope(procfs_listener); 670 exechook_disestablish(procfs_exechook); 671 exithook_disestablish(procfs_exithook); 672 mutex_destroy(&procfs_hashlock); 673 hashdone(procfs_hashtab, HASH_LIST, procfs_hashmask); 674 break; 675 default: 676 error = ENOTTY; 677 break; 678 } 679 680 return (error); 681 } 682
Indexes created Mon Sep 22 10:09:38 GMT 2025