| 1 | /* $NetBSD: procfs_vfsops.c,v 1.95 2016/11/03 03:53:32 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 1.95 2016/11/03 03:53:32 pgoyette Exp $" ); |
| 80 | |
| 81 | #if defined(_KERNEL_OPT) |
| 82 | #include "opt_compat_netbsd.h" |
| 83 | #endif |
| 84 | |
| 85 | #include <sys/param.h> |
| 86 | #include <sys/time.h> |
| 87 | #include <sys/kernel.h> |
| 88 | #include <sys/systm.h> |
| 89 | #include <sys/sysctl.h> |
| 90 | #include <sys/proc.h> |
| 91 | #include <sys/buf.h> |
| 92 | #include <sys/syslog.h> |
| 93 | #include <sys/mount.h> |
| 94 | #include <sys/dirent.h> |
| 95 | #include <sys/signalvar.h> |
| 96 | #include <sys/vnode.h> |
| 97 | #include <sys/file.h> |
| 98 | #include <sys/filedesc.h> |
| 99 | #include <sys/kauth.h> |
| 100 | #include <sys/module.h> |
| 101 | |
| 102 | #include <miscfs/genfs/genfs.h> |
| 103 | |
| 104 | #include <miscfs/procfs/procfs.h> |
| 105 | |
| 106 | #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ |
| 107 | |
| 108 | MODULE(MODULE_CLASS_VFS, procfs, "ptrace_common" ); |
| 109 | |
| 110 | VFS_PROTOS(procfs); |
| 111 | |
| 112 | static struct sysctllog *procfs_sysctl_log; |
| 113 | |
| 114 | static kauth_listener_t procfs_listener; |
| 115 | |
| 116 | /* |
| 117 | * VFS Operations. |
| 118 | * |
| 119 | * mount system call |
| 120 | */ |
| 121 | /* ARGSUSED */ |
| 122 | int |
| 123 | procfs_mount( |
| 124 | struct mount *mp, |
| 125 | const char *path, |
| 126 | void *data, |
| 127 | size_t *data_len) |
| 128 | { |
| 129 | struct lwp *l = curlwp; |
| 130 | struct procfsmount *pmnt; |
| 131 | struct procfs_args *args = data; |
| 132 | int error; |
| 133 | |
| 134 | if (args == NULL) |
| 135 | return EINVAL; |
| 136 | |
| 137 | if (UIO_MX & (UIO_MX-1)) { |
| 138 | log(LOG_ERR, "procfs: invalid directory entry size" ); |
| 139 | return (EINVAL); |
| 140 | } |
| 141 | |
| 142 | if (mp->mnt_flag & MNT_GETARGS) { |
| 143 | if (*data_len < sizeof *args) |
| 144 | return EINVAL; |
| 145 | |
| 146 | pmnt = VFSTOPROC(mp); |
| 147 | if (pmnt == NULL) |
| 148 | return EIO; |
| 149 | args->version = PROCFS_ARGSVERSION; |
| 150 | args->flags = pmnt->pmnt_flags; |
| 151 | *data_len = sizeof *args; |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | if (mp->mnt_flag & MNT_UPDATE) |
| 156 | return (EOPNOTSUPP); |
| 157 | |
| 158 | if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) |
| 159 | return EINVAL; |
| 160 | |
| 161 | pmnt = kmem_zalloc(sizeof(struct procfsmount), KM_SLEEP); |
| 162 | |
| 163 | mp->mnt_stat.f_namemax = PROCFS_MAXNAMLEN; |
| 164 | mp->mnt_flag |= MNT_LOCAL; |
| 165 | mp->mnt_data = pmnt; |
| 166 | vfs_getnewfsid(mp); |
| 167 | |
| 168 | error = set_statvfs_info(path, UIO_USERSPACE, "procfs" , UIO_SYSSPACE, |
| 169 | mp->mnt_op->vfs_name, mp, l); |
| 170 | pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); |
| 171 | if (*data_len >= sizeof *args) |
| 172 | pmnt->pmnt_flags = args->flags; |
| 173 | else |
| 174 | pmnt->pmnt_flags = 0; |
| 175 | |
| 176 | mp->mnt_iflag |= IMNT_MPSAFE; |
| 177 | return error; |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * unmount system call |
| 182 | */ |
| 183 | int |
| 184 | procfs_unmount(struct mount *mp, int mntflags) |
| 185 | { |
| 186 | int error; |
| 187 | int flags = 0; |
| 188 | |
| 189 | if (mntflags & MNT_FORCE) |
| 190 | flags |= FORCECLOSE; |
| 191 | |
| 192 | if ((error = vflush(mp, 0, flags)) != 0) |
| 193 | return (error); |
| 194 | |
| 195 | exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); |
| 196 | |
| 197 | kmem_free(mp->mnt_data, sizeof(struct procfsmount)); |
| 198 | mp->mnt_data = NULL; |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | int |
| 204 | procfs_root(struct mount *mp, struct vnode **vpp) |
| 205 | { |
| 206 | int error; |
| 207 | |
| 208 | error = procfs_allocvp(mp, vpp, 0, PFSroot, -1); |
| 209 | if (error == 0) { |
| 210 | error = vn_lock(*vpp, LK_EXCLUSIVE); |
| 211 | if (error != 0) { |
| 212 | vrele(*vpp); |
| 213 | *vpp = NULL; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | return error; |
| 218 | } |
| 219 | |
| 220 | /* ARGSUSED */ |
| 221 | int |
| 222 | procfs_start(struct mount *mp, int flags) |
| 223 | { |
| 224 | |
| 225 | return (0); |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Get file system statistics. |
| 230 | */ |
| 231 | int |
| 232 | procfs_statvfs(struct mount *mp, struct statvfs *sbp) |
| 233 | { |
| 234 | |
| 235 | genfs_statvfs(mp, sbp); |
| 236 | |
| 237 | sbp->f_bsize = PAGE_SIZE; |
| 238 | sbp->f_frsize = PAGE_SIZE; |
| 239 | sbp->f_iosize = PAGE_SIZE; |
| 240 | sbp->f_blocks = 1; |
| 241 | sbp->f_files = maxproc; /* approx */ |
| 242 | sbp->f_ffree = maxproc - nprocs; /* approx */ |
| 243 | sbp->f_favail = maxproc - nprocs; /* approx */ |
| 244 | |
| 245 | return (0); |
| 246 | } |
| 247 | |
| 248 | /*ARGSUSED*/ |
| 249 | int |
| 250 | procfs_sync( |
| 251 | struct mount *mp, |
| 252 | int waitfor, |
| 253 | kauth_cred_t uc) |
| 254 | { |
| 255 | |
| 256 | return (0); |
| 257 | } |
| 258 | |
| 259 | /*ARGSUSED*/ |
| 260 | int |
| 261 | procfs_vget(struct mount *mp, ino_t ino, |
| 262 | struct vnode **vpp) |
| 263 | { |
| 264 | return (EOPNOTSUPP); |
| 265 | } |
| 266 | |
| 267 | int |
| 268 | procfs_loadvnode(struct mount *mp, struct vnode *vp, |
| 269 | const void *key, size_t key_len, const void **new_key) |
| 270 | { |
| 271 | int error; |
| 272 | struct pfskey pfskey; |
| 273 | struct pfsnode *pfs; |
| 274 | |
| 275 | KASSERT(key_len == sizeof(pfskey)); |
| 276 | memcpy(&pfskey, key, key_len); |
| 277 | |
| 278 | pfs = kmem_alloc(sizeof(*pfs), KM_SLEEP); |
| 279 | pfs->pfs_pid = pfskey.pk_pid; |
| 280 | pfs->pfs_type = pfskey.pk_type; |
| 281 | pfs->pfs_fd = pfskey.pk_fd; |
| 282 | pfs->pfs_vnode = vp; |
| 283 | pfs->pfs_flags = 0; |
| 284 | pfs->pfs_fileno = |
| 285 | PROCFS_FILENO(pfs->pfs_pid, pfs->pfs_type, pfs->pfs_fd); |
| 286 | vp->v_tag = VT_PROCFS; |
| 287 | vp->v_op = procfs_vnodeop_p; |
| 288 | vp->v_data = pfs; |
| 289 | |
| 290 | switch (pfs->pfs_type) { |
| 291 | case PFSroot: /* /proc = dr-xr-xr-x */ |
| 292 | vp->v_vflag |= VV_ROOT; |
| 293 | /*FALLTHROUGH*/ |
| 294 | case PFSproc: /* /proc/N = dr-xr-xr-x */ |
| 295 | pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
| 296 | vp->v_type = VDIR; |
| 297 | break; |
| 298 | |
| 299 | case PFStask: /* /proc/N/task = dr-xr-xr-x */ |
| 300 | if (pfs->pfs_fd == -1) { |
| 301 | pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP| |
| 302 | S_IROTH|S_IXOTH; |
| 303 | vp->v_type = VDIR; |
| 304 | break; |
| 305 | } |
| 306 | /*FALLTHROUGH*/ |
| 307 | case PFScurproc: /* /proc/curproc = lr-xr-xr-x */ |
| 308 | case PFSself: /* /proc/self = lr-xr-xr-x */ |
| 309 | case PFScwd: /* /proc/N/cwd = lr-xr-xr-x */ |
| 310 | case PFSchroot: /* /proc/N/chroot = lr-xr-xr-x */ |
| 311 | case PFSexe: /* /proc/N/exe = lr-xr-xr-x */ |
| 312 | pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
| 313 | vp->v_type = VLNK; |
| 314 | break; |
| 315 | |
| 316 | case PFSfd: |
| 317 | if (pfs->pfs_fd == -1) { /* /proc/N/fd = dr-x------ */ |
| 318 | pfs->pfs_mode = S_IRUSR|S_IXUSR; |
| 319 | vp->v_type = VDIR; |
| 320 | } else { /* /proc/N/fd/M = [ps-]rw------- */ |
| 321 | file_t *fp; |
| 322 | vnode_t *vxp; |
| 323 | struct proc *p; |
| 324 | |
| 325 | mutex_enter(proc_lock); |
| 326 | p = proc_find(pfs->pfs_pid); |
| 327 | mutex_exit(proc_lock); |
| 328 | if (p == NULL) { |
| 329 | error = ENOENT; |
| 330 | goto bad; |
| 331 | } |
| 332 | KASSERT(rw_read_held(&p->p_reflock)); |
| 333 | if ((fp = fd_getfile2(p, pfs->pfs_fd)) == NULL) { |
| 334 | error = EBADF; |
| 335 | goto bad; |
| 336 | } |
| 337 | |
| 338 | pfs->pfs_mode = S_IRUSR|S_IWUSR; |
| 339 | switch (fp->f_type) { |
| 340 | case DTYPE_VNODE: |
| 341 | vxp = fp->f_vnode; |
| 342 | |
| 343 | /* |
| 344 | * We make symlinks for directories |
| 345 | * to avoid cycles. |
| 346 | */ |
| 347 | if (vxp->v_type == VDIR) |
| 348 | goto symlink; |
| 349 | vp->v_type = vxp->v_type; |
| 350 | break; |
| 351 | case DTYPE_PIPE: |
| 352 | vp->v_type = VFIFO; |
| 353 | break; |
| 354 | case DTYPE_SOCKET: |
| 355 | vp->v_type = VSOCK; |
| 356 | break; |
| 357 | case DTYPE_KQUEUE: |
| 358 | case DTYPE_MISC: |
| 359 | case DTYPE_SEM: |
| 360 | symlink: |
| 361 | pfs->pfs_mode = S_IRUSR|S_IXUSR|S_IRGRP| |
| 362 | S_IXGRP|S_IROTH|S_IXOTH; |
| 363 | vp->v_type = VLNK; |
| 364 | break; |
| 365 | default: |
| 366 | error = EOPNOTSUPP; |
| 367 | closef(fp); |
| 368 | goto bad; |
| 369 | } |
| 370 | closef(fp); |
| 371 | } |
| 372 | break; |
| 373 | |
| 374 | case PFSfile: /* /proc/N/file = -rw------- */ |
| 375 | case PFSmem: /* /proc/N/mem = -rw------- */ |
| 376 | case PFSregs: /* /proc/N/regs = -rw------- */ |
| 377 | case PFSfpregs: /* /proc/N/fpregs = -rw------- */ |
| 378 | pfs->pfs_mode = S_IRUSR|S_IWUSR; |
| 379 | vp->v_type = VREG; |
| 380 | break; |
| 381 | |
| 382 | case PFSctl: /* /proc/N/ctl = --w------ */ |
| 383 | case PFSnote: /* /proc/N/note = --w------ */ |
| 384 | case PFSnotepg: /* /proc/N/notepg = --w------ */ |
| 385 | pfs->pfs_mode = S_IWUSR; |
| 386 | vp->v_type = VREG; |
| 387 | break; |
| 388 | |
| 389 | case PFSmap: /* /proc/N/map = -r--r--r-- */ |
| 390 | case PFSmaps: /* /proc/N/maps = -r--r--r-- */ |
| 391 | case PFSstatus: /* /proc/N/status = -r--r--r-- */ |
| 392 | case PFSstat: /* /proc/N/stat = -r--r--r-- */ |
| 393 | case PFScmdline: /* /proc/N/cmdline = -r--r--r-- */ |
| 394 | case PFSemul: /* /proc/N/emul = -r--r--r-- */ |
| 395 | case PFSmeminfo: /* /proc/meminfo = -r--r--r-- */ |
| 396 | case PFScpustat: /* /proc/stat = -r--r--r-- */ |
| 397 | case PFSdevices: /* /proc/devices = -r--r--r-- */ |
| 398 | case PFScpuinfo: /* /proc/cpuinfo = -r--r--r-- */ |
| 399 | case PFSuptime: /* /proc/uptime = -r--r--r-- */ |
| 400 | case PFSmounts: /* /proc/mounts = -r--r--r-- */ |
| 401 | case PFSloadavg: /* /proc/loadavg = -r--r--r-- */ |
| 402 | case PFSstatm: /* /proc/N/statm = -r--r--r-- */ |
| 403 | case PFSversion: /* /proc/version = -r--r--r-- */ |
| 404 | pfs->pfs_mode = S_IRUSR|S_IRGRP|S_IROTH; |
| 405 | vp->v_type = VREG; |
| 406 | break; |
| 407 | |
| 408 | #ifdef __HAVE_PROCFS_MACHDEP |
| 409 | PROCFS_MACHDEP_NODETYPE_CASES |
| 410 | procfs_machdep_allocvp(vp); |
| 411 | break; |
| 412 | #endif |
| 413 | |
| 414 | default: |
| 415 | panic("procfs_allocvp" ); |
| 416 | } |
| 417 | |
| 418 | uvm_vnp_setsize(vp, 0); |
| 419 | *new_key = &pfs->pfs_key; |
| 420 | |
| 421 | return 0; |
| 422 | |
| 423 | bad: |
| 424 | vp->v_tag =VT_NON; |
| 425 | vp->v_type = VNON; |
| 426 | vp->v_op = NULL; |
| 427 | vp->v_data = NULL; |
| 428 | kmem_free(pfs, sizeof(*pfs)); |
| 429 | return error; |
| 430 | } |
| 431 | |
| 432 | void |
| 433 | procfs_init(void) |
| 434 | { |
| 435 | |
| 436 | } |
| 437 | |
| 438 | void |
| 439 | procfs_reinit(void) |
| 440 | { |
| 441 | |
| 442 | } |
| 443 | |
| 444 | void |
| 445 | procfs_done(void) |
| 446 | { |
| 447 | |
| 448 | } |
| 449 | |
| 450 | extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; |
| 451 | |
| 452 | const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { |
| 453 | &procfs_vnodeop_opv_desc, |
| 454 | NULL, |
| 455 | }; |
| 456 | |
| 457 | struct vfsops procfs_vfsops = { |
| 458 | .vfs_name = MOUNT_PROCFS, |
| 459 | .vfs_min_mount_data = sizeof (struct procfs_args), |
| 460 | .vfs_mount = procfs_mount, |
| 461 | .vfs_start = procfs_start, |
| 462 | .vfs_unmount = procfs_unmount, |
| 463 | .vfs_root = procfs_root, |
| 464 | .vfs_quotactl = (void *)eopnotsupp, |
| 465 | .vfs_statvfs = procfs_statvfs, |
| 466 | .vfs_sync = procfs_sync, |
| 467 | .vfs_vget = procfs_vget, |
| 468 | .vfs_loadvnode = procfs_loadvnode, |
| 469 | .vfs_fhtovp = (void *)eopnotsupp, |
| 470 | .vfs_vptofh = (void *)eopnotsupp, |
| 471 | .vfs_init = procfs_init, |
| 472 | .vfs_reinit = procfs_reinit, |
| 473 | .vfs_done = procfs_done, |
| 474 | .vfs_snapshot = (void *)eopnotsupp, |
| 475 | .vfs_extattrctl = vfs_stdextattrctl, |
| 476 | .vfs_suspendctl = (void *)eopnotsupp, |
| 477 | .vfs_renamelock_enter = genfs_renamelock_enter, |
| 478 | .vfs_renamelock_exit = genfs_renamelock_exit, |
| 479 | .vfs_fsync = (void *)eopnotsupp, |
| 480 | .vfs_opv_descs = procfs_vnodeopv_descs |
| 481 | }; |
| 482 | |
| 483 | static int |
| 484 | procfs_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, |
| 485 | void *arg0, void *arg1, void *arg2, void *arg3) |
| 486 | { |
| 487 | struct proc *p; |
| 488 | struct pfsnode *pfs; |
| 489 | enum kauth_process_req req; |
| 490 | int result; |
| 491 | |
| 492 | result = KAUTH_RESULT_DEFER; |
| 493 | p = arg0; |
| 494 | pfs = arg1; |
| 495 | req = (enum kauth_process_req)(unsigned long)arg2; |
| 496 | |
| 497 | if (action != KAUTH_PROCESS_PROCFS) |
| 498 | return result; |
| 499 | |
| 500 | /* Privileged; let secmodel handle that. */ |
| 501 | if (req == KAUTH_REQ_PROCESS_PROCFS_CTL) |
| 502 | return result; |
| 503 | |
| 504 | switch (pfs->pfs_type) { |
| 505 | case PFSregs: |
| 506 | case PFSfpregs: |
| 507 | case PFSmem: |
| 508 | if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || |
| 509 | ISSET(p->p_flag, PK_SUGID)) |
| 510 | break; |
| 511 | |
| 512 | /*FALLTHROUGH*/ |
| 513 | default: |
| 514 | result = KAUTH_RESULT_ALLOW; |
| 515 | break; |
| 516 | } |
| 517 | |
| 518 | return result; |
| 519 | } |
| 520 | |
| 521 | |
| 522 | static int |
| 523 | procfs_modcmd(modcmd_t cmd, void *arg) |
| 524 | { |
| 525 | int error; |
| 526 | |
| 527 | switch (cmd) { |
| 528 | case MODULE_CMD_INIT: |
| 529 | error = vfs_attach(&procfs_vfsops); |
| 530 | if (error != 0) |
| 531 | break; |
| 532 | sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, |
| 533 | CTLFLAG_PERMANENT, |
| 534 | CTLTYPE_NODE, "procfs" , |
| 535 | SYSCTL_DESCR("Process file system" ), |
| 536 | NULL, 0, NULL, 0, |
| 537 | CTL_VFS, 12, CTL_EOL); |
| 538 | /* |
| 539 | * XXX the "12" above could be dynamic, thereby eliminating |
| 540 | * one more instance of the "number to vfs" mapping problem, |
| 541 | * but "12" is the order as taken from sys/mount.h |
| 542 | */ |
| 543 | |
| 544 | procfs_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, |
| 545 | procfs_listener_cb, NULL); |
| 546 | |
| 547 | break; |
| 548 | case MODULE_CMD_FINI: |
| 549 | error = vfs_detach(&procfs_vfsops); |
| 550 | if (error != 0) |
| 551 | break; |
| 552 | sysctl_teardown(&procfs_sysctl_log); |
| 553 | kauth_unlisten_scope(procfs_listener); |
| 554 | break; |
| 555 | default: |
| 556 | error = ENOTTY; |
| 557 | break; |
| 558 | } |
| 559 | |
| 560 | return (error); |
| 561 | } |
| 562 | |