procfs_vfsops.c revision 1.86.14.1
1 /* $NetBSD: procfs_vfsops.c,v 1.86.14.1 2014/04/21 10:17:49 bouyer 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 1.86.14.1 2014/04/21 10:17:49 bouyer 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/malloc.h> 98 #include <sys/kauth.h> 99 #include <sys/module.h> 100 101 #include <miscfs/genfs/genfs.h> 102 103 #include <miscfs/procfs/procfs.h> 104 105 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 106 107 MODULE(MODULE_CLASS_VFS, procfs, NULL); 108 109 VFS_PROTOS(procfs); 110 111 static struct sysctllog *procfs_sysctl_log; 112 113 static kauth_listener_t procfs_listener; 114 115 /* 116 * VFS Operations. 117 * 118 * mount system call 119 */ 120 /* ARGSUSED */ 121 int 122 procfs_mount( 123 struct mount *mp, 124 const char *path, 125 void *data, 126 size_t *data_len) 127 { 128 struct lwp *l = curlwp; 129 struct procfsmount *pmnt; 130 struct procfs_args *args = data; 131 int error; 132 133 if (args == NULL) 134 return EINVAL; 135 136 if (UIO_MX & (UIO_MX-1)) { 137 log(LOG_ERR, "procfs: invalid directory entry size"); 138 return (EINVAL); 139 } 140 141 if (mp->mnt_flag & MNT_GETARGS) { 142 if (*data_len < sizeof *args) 143 return EINVAL; 144 145 pmnt = VFSTOPROC(mp); 146 if (pmnt == NULL) 147 return EIO; 148 args->version = PROCFS_ARGSVERSION; 149 args->flags = pmnt->pmnt_flags; 150 *data_len = sizeof *args; 151 return 0; 152 } 153 154 if (mp->mnt_flag & MNT_UPDATE) 155 return (EOPNOTSUPP); 156 157 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 158 return EINVAL; 159 160 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 161 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 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 free(mp->mnt_data, M_UFSMNT); 198 mp->mnt_data = NULL; 199 200 return (0); 201 } 202 203 int 204 procfs_root(struct mount *mp, struct vnode **vpp) 205 { 206 207 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 208 } 209 210 /* ARGSUSED */ 211 int 212 procfs_start(struct mount *mp, int flags) 213 { 214 215 return (0); 216 } 217 218 /* 219 * Get file system statistics. 220 */ 221 int 222 procfs_statvfs(struct mount *mp, struct statvfs *sbp) 223 { 224 225 genfs_statvfs(mp, sbp); 226 227 sbp->f_bsize = PAGE_SIZE; 228 sbp->f_frsize = PAGE_SIZE; 229 sbp->f_iosize = PAGE_SIZE; 230 sbp->f_blocks = 1; 231 sbp->f_files = maxproc; /* approx */ 232 sbp->f_ffree = maxproc - nprocs; /* approx */ 233 sbp->f_favail = maxproc - nprocs; /* approx */ 234 235 return (0); 236 } 237 238 /*ARGSUSED*/ 239 int 240 procfs_sync( 241 struct mount *mp, 242 int waitfor, 243 kauth_cred_t uc) 244 { 245 246 return (0); 247 } 248 249 /*ARGSUSED*/ 250 int 251 procfs_vget(struct mount *mp, ino_t ino, 252 struct vnode **vpp) 253 { 254 return (EOPNOTSUPP); 255 } 256 257 void 258 procfs_init(void) 259 { 260 procfs_hashinit(); 261 } 262 263 void 264 procfs_reinit(void) 265 { 266 procfs_hashreinit(); 267 } 268 269 void 270 procfs_done(void) 271 { 272 procfs_hashdone(); 273 } 274 275 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 276 277 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 278 &procfs_vnodeop_opv_desc, 279 NULL, 280 }; 281 282 struct vfsops procfs_vfsops = { 283 MOUNT_PROCFS, 284 sizeof (struct procfs_args), 285 procfs_mount, 286 procfs_start, 287 procfs_unmount, 288 procfs_root, 289 (void *)eopnotsupp, /* vfs_quotactl */ 290 procfs_statvfs, 291 procfs_sync, 292 procfs_vget, 293 (void *)eopnotsupp, /* vfs_fhtovp */ 294 (void *)eopnotsupp, /* vfs_vptofh */ 295 procfs_init, 296 procfs_reinit, 297 procfs_done, 298 NULL, /* vfs_mountroot */ 299 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 300 vfs_stdextattrctl, 301 (void *)eopnotsupp, /* vfs_suspendctl */ 302 genfs_renamelock_enter, 303 genfs_renamelock_exit, 304 (void *)eopnotsupp, 305 procfs_vnodeopv_descs, 306 0, 307 { NULL, NULL }, 308 }; 309 310 static int 311 procfs_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 312 void *arg0, void *arg1, void *arg2, void *arg3) 313 { 314 struct proc *p; 315 struct pfsnode *pfs; 316 enum kauth_process_req req; 317 int result; 318 319 result = KAUTH_RESULT_DEFER; 320 p = arg0; 321 pfs = arg1; 322 req = (enum kauth_process_req)(unsigned long)arg2; 323 324 if (action != KAUTH_PROCESS_PROCFS) 325 return result; 326 327 /* Privileged; let secmodel handle that. */ 328 if (req == KAUTH_REQ_PROCESS_PROCFS_CTL) 329 return result; 330 331 switch (pfs->pfs_type) { 332 case PFSregs: 333 case PFSfpregs: 334 case PFSmem: 335 if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || 336 ISSET(p->p_flag, PK_SUGID)) 337 break; 338 339 /*FALLTHROUGH*/ 340 default: 341 result = KAUTH_RESULT_ALLOW; 342 break; 343 } 344 345 return result; 346 } 347 348 349 static int 350 procfs_modcmd(modcmd_t cmd, void *arg) 351 { 352 int error; 353 354 switch (cmd) { 355 case MODULE_CMD_INIT: 356 error = vfs_attach(&procfs_vfsops); 357 if (error != 0) 358 break; 359 sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, 360 CTLFLAG_PERMANENT, 361 CTLTYPE_NODE, "vfs", NULL, 362 NULL, 0, NULL, 0, 363 CTL_VFS, CTL_EOL); 364 sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, 365 CTLFLAG_PERMANENT, 366 CTLTYPE_NODE, "procfs", 367 SYSCTL_DESCR("Process file system"), 368 NULL, 0, NULL, 0, 369 CTL_VFS, 12, CTL_EOL); 370 /* 371 * XXX the "12" above could be dynamic, thereby eliminating 372 * one more instance of the "number to vfs" mapping problem, 373 * but "12" is the order as taken from sys/mount.h 374 */ 375 376 procfs_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, 377 procfs_listener_cb, NULL); 378 379 break; 380 case MODULE_CMD_FINI: 381 error = vfs_detach(&procfs_vfsops); 382 if (error != 0) 383 break; 384 sysctl_teardown(&procfs_sysctl_log); 385 kauth_unlisten_scope(procfs_listener); 386 break; 387 default: 388 error = ENOTTY; 389 break; 390 } 391 392 return (error); 393 } 394
Indexes created Mon Sep 29 15:09:53 GMT 2025