1 /* $NetBSD: procfs_vfsops.c,v 1.84 2009/10/02 23:00:02 elad 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 1.84 2009/10/02 23:00:02 elad 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 (UIO_MX & (UIO_MX-1)) { 134 log(LOG_ERR, "procfs: invalid directory entry size"); 135 return (EINVAL); 136 } 137 138 if (mp->mnt_flag & MNT_GETARGS) { 139 if (*data_len < sizeof *args) 140 return EINVAL; 141 142 pmnt = VFSTOPROC(mp); 143 if (pmnt == NULL) 144 return EIO; 145 args->version = PROCFS_ARGSVERSION; 146 args->flags = pmnt->pmnt_flags; 147 *data_len = sizeof *args; 148 return 0; 149 } 150 151 if (mp->mnt_flag & MNT_UPDATE) 152 return (EOPNOTSUPP); 153 154 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 155 return EINVAL; 156 157 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 158 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 159 160 mp->mnt_stat.f_namemax = MAXNAMLEN; 161 mp->mnt_flag |= MNT_LOCAL; 162 mp->mnt_data = pmnt; 163 vfs_getnewfsid(mp); 164 165 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 166 mp->mnt_op->vfs_name, mp, l); 167 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 168 if (*data_len >= sizeof *args) 169 pmnt->pmnt_flags = args->flags; 170 else 171 pmnt->pmnt_flags = 0; 172 173 mp->mnt_iflag |= IMNT_MPSAFE; 174 return error; 175 } 176 177 /* 178 * unmount system call 179 */ 180 int 181 procfs_unmount(struct mount *mp, int mntflags) 182 { 183 int error; 184 int flags = 0; 185 186 if (mntflags & MNT_FORCE) 187 flags |= FORCECLOSE; 188 189 if ((error = vflush(mp, 0, flags)) != 0) 190 return (error); 191 192 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 193 194 free(mp->mnt_data, M_UFSMNT); 195 mp->mnt_data = NULL; 196 197 return (0); 198 } 199 200 int 201 procfs_root(struct mount *mp, struct vnode **vpp) 202 { 203 204 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 205 } 206 207 /* ARGSUSED */ 208 int 209 procfs_start(struct mount *mp, int flags) 210 { 211 212 return (0); 213 } 214 215 /* 216 * Get file system statistics. 217 */ 218 int 219 procfs_statvfs(struct mount *mp, struct statvfs *sbp) 220 { 221 222 sbp->f_bsize = PAGE_SIZE; 223 sbp->f_frsize = PAGE_SIZE; 224 sbp->f_iosize = PAGE_SIZE; 225 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 226 sbp->f_bfree = 0; 227 sbp->f_bavail = 0; 228 sbp->f_bresvd = 0; 229 sbp->f_files = maxproc; /* approx */ 230 sbp->f_ffree = maxproc - nprocs; /* approx */ 231 sbp->f_favail = maxproc - nprocs; /* approx */ 232 sbp->f_fresvd = 0; 233 copy_statvfs_info(sbp, mp); 234 return (0); 235 } 236 237 /*ARGSUSED*/ 238 int 239 procfs_sync( 240 struct mount *mp, 241 int waitfor, 242 kauth_cred_t uc) 243 { 244 245 return (0); 246 } 247 248 /*ARGSUSED*/ 249 int 250 procfs_vget(struct mount *mp, ino_t ino, 251 struct vnode **vpp) 252 { 253 return (EOPNOTSUPP); 254 } 255 256 void 257 procfs_init(void) 258 { 259 procfs_hashinit(); 260 } 261 262 void 263 procfs_reinit(void) 264 { 265 procfs_hashreinit(); 266 } 267 268 void 269 procfs_done(void) 270 { 271 procfs_hashdone(); 272 } 273 274 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 275 276 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 277 &procfs_vnodeop_opv_desc, 278 NULL, 279 }; 280 281 struct vfsops procfs_vfsops = { 282 MOUNT_PROCFS, 283 sizeof (struct procfs_args), 284 procfs_mount, 285 procfs_start, 286 procfs_unmount, 287 procfs_root, 288 (void *)eopnotsupp, /* vfs_quotactl */ 289 procfs_statvfs, 290 procfs_sync, 291 procfs_vget, 292 (void *)eopnotsupp, /* vfs_fhtovp */ 293 (void *)eopnotsupp, /* vfs_vptofh */ 294 procfs_init, 295 procfs_reinit, 296 procfs_done, 297 NULL, /* vfs_mountroot */ 298 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 299 vfs_stdextattrctl, 300 (void *)eopnotsupp, /* vfs_suspendctl */ 301 genfs_renamelock_enter, 302 genfs_renamelock_exit, 303 (void *)eopnotsupp, 304 procfs_vnodeopv_descs, 305 0, 306 { NULL, NULL }, 307 }; 308 309 static int 310 procfs_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 311 void *arg0, void *arg1, void *arg2, void *arg3) 312 { 313 struct proc *p; 314 struct pfsnode *pfs; 315 enum kauth_process_req req; 316 int result; 317 318 result = KAUTH_RESULT_DEFER; 319 p = arg0; 320 pfs = arg1; 321 req = (enum kauth_process_req)(unsigned long)arg2; 322 323 if (action != KAUTH_PROCESS_PROCFS) 324 return result; 325 326 /* Privileged; let secmodel handle that. */ 327 if (req == KAUTH_REQ_PROCESS_PROCFS_CTL) 328 return result; 329 330 switch (pfs->pfs_type) { 331 case PFSregs: 332 case PFSfpregs: 333 case PFSmem: 334 if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || 335 ISSET(p->p_flag, PK_SUGID)) 336 break; 337 338 /*FALLTHROUGH*/ 339 default: 340 result = KAUTH_RESULT_ALLOW; 341 break; 342 } 343 344 return result; 345 } 346 347 348 static int 349 procfs_modcmd(modcmd_t cmd, void *arg) 350 { 351 int error; 352 353 switch (cmd) { 354 case MODULE_CMD_INIT: 355 error = vfs_attach(&procfs_vfsops); 356 if (error != 0) 357 break; 358 sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, 359 CTLFLAG_PERMANENT, 360 CTLTYPE_NODE, "vfs", NULL, 361 NULL, 0, NULL, 0, 362 CTL_VFS, CTL_EOL); 363 sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, 364 CTLFLAG_PERMANENT, 365 CTLTYPE_NODE, "procfs", 366 SYSCTL_DESCR("Process file system"), 367 NULL, 0, NULL, 0, 368 CTL_VFS, 12, CTL_EOL); 369 /* 370 * XXX the "12" above could be dynamic, thereby eliminating 371 * one more instance of the "number to vfs" mapping problem, 372 * but "12" is the order as taken from sys/mount.h 373 */ 374 375 procfs_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, 376 procfs_listener_cb, NULL); 377 378 break; 379 case MODULE_CMD_FINI: 380 error = vfs_detach(&procfs_vfsops); 381 if (error != 0) 382 break; 383 sysctl_teardown(&procfs_sysctl_log); 384 kauth_unlisten_scope(procfs_listener); 385 break; 386 default: 387 error = ENOTTY; 388 break; 389 } 390 391 return (error); 392 } 393