| 1 | /* $NetBSD: kern_module_vfs.c,v 1.14 2016/03/15 02:59:24 pgoyette Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software developed for The NetBSD Foundation |
| 8 | * by Andrew Doran. |
| 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 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * Kernel module file system interaction. |
| 34 | */ |
| 35 | |
| 36 | #include <sys/cdefs.h> |
| 37 | __KERNEL_RCSID(0, "$NetBSD: kern_module_vfs.c,v 1.14 2016/03/15 02:59:24 pgoyette Exp $" ); |
| 38 | |
| 39 | #define _MODULE_INTERNAL |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/fcntl.h> |
| 42 | #include <sys/kmem.h> |
| 43 | #include <sys/kobj.h> |
| 44 | #include <sys/module.h> |
| 45 | #include <sys/namei.h> |
| 46 | #include <sys/pool.h> |
| 47 | #include <sys/stat.h> |
| 48 | #include <sys/vnode.h> |
| 49 | |
| 50 | #include <prop/proplib.h> |
| 51 | |
| 52 | static int module_load_plist_vfs(const char *, const bool, |
| 53 | prop_dictionary_t *); |
| 54 | |
| 55 | void |
| 56 | module_load_vfs_init(void) |
| 57 | { |
| 58 | module_load_vfs_vec = module_load_vfs; |
| 59 | aprint_normal("kern.module.path=%s\n" , module_base); |
| 60 | } |
| 61 | |
| 62 | int |
| 63 | module_load_vfs(const char *name, int flags, bool autoload, |
| 64 | module_t *mod, prop_dictionary_t *filedictp) |
| 65 | { |
| 66 | char *path; |
| 67 | bool nochroot; |
| 68 | int error; |
| 69 | prop_bool_t noload; |
| 70 | prop_dictionary_t moduledict; |
| 71 | |
| 72 | nochroot = false; |
| 73 | error = 0; |
| 74 | path = NULL; |
| 75 | moduledict = NULL; |
| 76 | if (filedictp) |
| 77 | *filedictp = NULL; |
| 78 | path = PNBUF_GET(); |
| 79 | |
| 80 | if (!autoload) { |
| 81 | if (strchr(name, '/') != NULL) { |
| 82 | nochroot = false; |
| 83 | snprintf(path, MAXPATHLEN, "%s" , name); |
| 84 | module_print("Loading module from %s" , path); |
| 85 | error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); |
| 86 | } else |
| 87 | error = ENOENT; |
| 88 | } |
| 89 | if (autoload || (error == ENOENT)) { |
| 90 | if (strchr(name, '/') == NULL) { |
| 91 | nochroot = true; |
| 92 | snprintf(path, MAXPATHLEN, "%s/%s/%s.kmod" , |
| 93 | module_base, name, name); |
| 94 | module_print("Loading module from %s" , path); |
| 95 | error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); |
| 96 | } else |
| 97 | error = ENOENT; |
| 98 | } |
| 99 | if (error != 0) { |
| 100 | PNBUF_PUT(path); |
| 101 | module_print("Cannot %sload kernel object `%s'" |
| 102 | " error=%d" , autoload ? "auto" : "" , name, error); |
| 103 | return error; |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * Load and process <module>.plist if it exists. |
| 108 | */ |
| 109 | if (((flags & MODCTL_NO_PROP) == 0 && filedictp) || autoload) { |
| 110 | error = module_load_plist_vfs(path, nochroot, &moduledict); |
| 111 | if (error != 0) { |
| 112 | module_print("plist load returned error %d for `%s'" , |
| 113 | error, path); |
| 114 | if (error != ENOENT) |
| 115 | goto fail; |
| 116 | } else if (autoload) { |
| 117 | noload = prop_dictionary_get(moduledict, "noautoload" ); |
| 118 | if (noload != NULL && prop_bool_true(noload)) { |
| 119 | module_error("autoloading is disallowed for %s" , |
| 120 | path); |
| 121 | prop_object_release(moduledict); |
| 122 | error = EPERM; |
| 123 | goto fail; |
| 124 | } |
| 125 | } |
| 126 | if (error == 0) { /* can get here if error == ENOENT */ |
| 127 | if ((flags & MODCTL_NO_PROP) == 0 && filedictp) |
| 128 | *filedictp = moduledict; |
| 129 | else |
| 130 | prop_object_release(moduledict); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | PNBUF_PUT(path); |
| 135 | return 0; |
| 136 | |
| 137 | fail: |
| 138 | kobj_unload(mod->mod_kobj); |
| 139 | PNBUF_PUT(path); |
| 140 | return error; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * module_load_plist_vfs: |
| 145 | * |
| 146 | * Load a plist located in the file system into memory. |
| 147 | */ |
| 148 | static int |
| 149 | module_load_plist_vfs(const char *modpath, const bool nochroot, |
| 150 | prop_dictionary_t *filedictp) |
| 151 | { |
| 152 | struct pathbuf *pb; |
| 153 | struct nameidata nd; |
| 154 | struct stat sb; |
| 155 | void *base; |
| 156 | char *proppath; |
| 157 | const size_t plistsize = 8192; |
| 158 | size_t resid; |
| 159 | int error, pathlen; |
| 160 | |
| 161 | KASSERT(filedictp != NULL); |
| 162 | base = NULL; |
| 163 | |
| 164 | proppath = PNBUF_GET(); |
| 165 | strcpy(proppath, modpath); |
| 166 | pathlen = strlen(proppath); |
| 167 | if ((pathlen >= 6) && (strcmp(&proppath[pathlen - 5], ".kmod" ) == 0)) { |
| 168 | strcpy(&proppath[pathlen - 5], ".plist" ); |
| 169 | } else if (pathlen < MAXPATHLEN - 6) { |
| 170 | strcat(proppath, ".plist" ); |
| 171 | } else { |
| 172 | error = ENOENT; |
| 173 | goto out1; |
| 174 | } |
| 175 | |
| 176 | /* XXX this makes an unnecessary extra copy of the path */ |
| 177 | pb = pathbuf_create(proppath); |
| 178 | if (pb == NULL) { |
| 179 | error = ENOMEM; |
| 180 | goto out1; |
| 181 | } |
| 182 | module_print("Loading plist from %s" , proppath); |
| 183 | |
| 184 | NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), pb); |
| 185 | |
| 186 | error = vn_open(&nd, FREAD, 0); |
| 187 | if (error != 0) { |
| 188 | goto out2; |
| 189 | } |
| 190 | |
| 191 | error = vn_stat(nd.ni_vp, &sb); |
| 192 | if (error != 0) { |
| 193 | goto out3; |
| 194 | } |
| 195 | if (sb.st_size >= (plistsize - 1)) { /* leave space for term \0 */ |
| 196 | error = EFBIG; |
| 197 | goto out3; |
| 198 | } |
| 199 | |
| 200 | base = kmem_alloc(plistsize, KM_SLEEP); |
| 201 | if (base == NULL) { |
| 202 | error = ENOMEM; |
| 203 | goto out3; |
| 204 | } |
| 205 | |
| 206 | error = vn_rdwr(UIO_READ, nd.ni_vp, base, sb.st_size, 0, |
| 207 | UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, curlwp); |
| 208 | *((uint8_t *)base + sb.st_size) = '\0'; |
| 209 | if (error == 0 && resid != 0) { |
| 210 | error = EFBIG; |
| 211 | } |
| 212 | if (error != 0) { |
| 213 | kmem_free(base, plistsize); |
| 214 | base = NULL; |
| 215 | goto out3; |
| 216 | } |
| 217 | |
| 218 | *filedictp = prop_dictionary_internalize(base); |
| 219 | if (*filedictp == NULL) { |
| 220 | error = EINVAL; |
| 221 | } |
| 222 | kmem_free(base, plistsize); |
| 223 | base = NULL; |
| 224 | KASSERT(error == 0); |
| 225 | |
| 226 | out3: |
| 227 | VOP_UNLOCK(nd.ni_vp); |
| 228 | vn_close(nd.ni_vp, FREAD, kauth_cred_get()); |
| 229 | |
| 230 | out2: |
| 231 | pathbuf_destroy(pb); |
| 232 | |
| 233 | out1: |
| 234 | PNBUF_PUT(proppath); |
| 235 | return error; |
| 236 | } |
| 237 | |