/* $NetBSD: procfs_vfsops.c,v 1.85 2009/11/30 10:59:20 pooka Exp $ */ /* * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 */ /* * Copyright (c) 1993 Jan-Simon Pendry * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 */ /* * procfs VFS interface */ #include __KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.85 2009/11/30 10:59:20 pooka Exp $"); #if defined(_KERNEL_OPT) #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* for PAGE_SIZE */ MODULE(MODULE_CLASS_VFS, procfs, NULL); VFS_PROTOS(procfs); static struct sysctllog *procfs_sysctl_log; static kauth_listener_t procfs_listener; /* * VFS Operations. * * mount system call */ /* ARGSUSED */ int procfs_mount( struct mount *mp, const char *path, void *data, size_t *data_len) { struct lwp *l = curlwp; struct procfsmount *pmnt; struct procfs_args *args = data; int error; if (UIO_MX & (UIO_MX-1)) { log(LOG_ERR, "procfs: invalid directory entry size"); return (EINVAL); } if (mp->mnt_flag & MNT_GETARGS) { if (*data_len < sizeof *args) return EINVAL; pmnt = VFSTOPROC(mp); if (pmnt == NULL) return EIO; args->version = PROCFS_ARGSVERSION; args->flags = pmnt->pmnt_flags; *data_len = sizeof *args; return 0; } if (mp->mnt_flag & MNT_UPDATE) return (EOPNOTSUPP); if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) return EINVAL; pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ mp->mnt_stat.f_namemax = MAXNAMLEN; mp->mnt_flag |= MNT_LOCAL; mp->mnt_data = pmnt; vfs_getnewfsid(mp); error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l); pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); if (*data_len >= sizeof *args) pmnt->pmnt_flags = args->flags; else pmnt->pmnt_flags = 0; mp->mnt_iflag |= IMNT_MPSAFE; return error; } /* * unmount system call */ int procfs_unmount(struct mount *mp, int mntflags) { int error; int flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; if ((error = vflush(mp, 0, flags)) != 0) return (error); exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); free(mp->mnt_data, M_UFSMNT); mp->mnt_data = NULL; return (0); } int procfs_root(struct mount *mp, struct vnode **vpp) { return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); } /* ARGSUSED */ int procfs_start(struct mount *mp, int flags) { return (0); } /* * Get file system statistics. */ int procfs_statvfs(struct mount *mp, struct statvfs *sbp) { genfs_statvfs(mp, sbp); sbp->f_bsize = PAGE_SIZE; sbp->f_frsize = PAGE_SIZE; sbp->f_iosize = PAGE_SIZE; sbp->f_blocks = 1; sbp->f_files = maxproc; /* approx */ sbp->f_ffree = maxproc - nprocs; /* approx */ sbp->f_favail = maxproc - nprocs; /* approx */ return (0); } /*ARGSUSED*/ int procfs_sync( struct mount *mp, int waitfor, kauth_cred_t uc) { return (0); } /*ARGSUSED*/ int procfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) { return (EOPNOTSUPP); } void procfs_init(void) { procfs_hashinit(); } void procfs_reinit(void) { procfs_hashreinit(); } void procfs_done(void) { procfs_hashdone(); } extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { &procfs_vnodeop_opv_desc, NULL, }; struct vfsops procfs_vfsops = { MOUNT_PROCFS, sizeof (struct procfs_args), procfs_mount, procfs_start, procfs_unmount, procfs_root, (void *)eopnotsupp, /* vfs_quotactl */ procfs_statvfs, procfs_sync, procfs_vget, (void *)eopnotsupp, /* vfs_fhtovp */ (void *)eopnotsupp, /* vfs_vptofh */ procfs_init, procfs_reinit, procfs_done, NULL, /* vfs_mountroot */ (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, vfs_stdextattrctl, (void *)eopnotsupp, /* vfs_suspendctl */ genfs_renamelock_enter, genfs_renamelock_exit, (void *)eopnotsupp, procfs_vnodeopv_descs, 0, { NULL, NULL }, }; static int procfs_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) { struct proc *p; struct pfsnode *pfs; enum kauth_process_req req; int result; result = KAUTH_RESULT_DEFER; p = arg0; pfs = arg1; req = (enum kauth_process_req)(unsigned long)arg2; if (action != KAUTH_PROCESS_PROCFS) return result; /* Privileged; let secmodel handle that. */ if (req == KAUTH_REQ_PROCESS_PROCFS_CTL) return result; switch (pfs->pfs_type) { case PFSregs: case PFSfpregs: case PFSmem: if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || ISSET(p->p_flag, PK_SUGID)) break; /*FALLTHROUGH*/ default: result = KAUTH_RESULT_ALLOW; break; } return result; } static int procfs_modcmd(modcmd_t cmd, void *arg) { int error; switch (cmd) { case MODULE_CMD_INIT: error = vfs_attach(&procfs_vfsops); if (error != 0) break; sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "vfs", NULL, NULL, 0, NULL, 0, CTL_VFS, CTL_EOL); sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "procfs", SYSCTL_DESCR("Process file system"), NULL, 0, NULL, 0, CTL_VFS, 12, CTL_EOL); /* * XXX the "12" above could be dynamic, thereby eliminating * one more instance of the "number to vfs" mapping problem, * but "12" is the order as taken from sys/mount.h */ procfs_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, procfs_listener_cb, NULL); break; case MODULE_CMD_FINI: error = vfs_detach(&procfs_vfsops); if (error != 0) break; sysctl_teardown(&procfs_sysctl_log); kauth_unlisten_scope(procfs_listener); break; default: error = ENOTTY; break; } return (error); }