1 /* $NetBSD: kern_module_vfs.c,v 1.12 2011/09/14 12:30:20 christos 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 1.12 2011/09/14 12:30:20 christos 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 } 60 61 int 62 module_load_vfs(const char *name, int flags, bool autoload, 63 module_t *mod, prop_dictionary_t *filedictp) 64 { 65 char *path; 66 bool nochroot; 67 int error; 68 prop_bool_t noload; 69 prop_dictionary_t moduledict; 70 71 nochroot = false; 72 error = 0; 73 path = NULL; 74 moduledict = NULL; 75 if (filedictp) 76 *filedictp = NULL; 77 path = PNBUF_GET(); 78 79 if (!autoload) { 80 if (strchr(name, '/') != NULL) { 81 nochroot = false; 82 snprintf(path, MAXPATHLEN, "%s", name); 83 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 84 } else 85 error = ENOENT; 86 } 87 if (autoload || (error == ENOENT)) { 88 if (strchr(name, '/') == NULL) { 89 nochroot = true; 90 snprintf(path, MAXPATHLEN, "%s/%s/%s.kmod", 91 module_base, name, name); 92 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 93 } else 94 error = ENOENT; 95 } 96 if (error != 0) { 97 PNBUF_PUT(path); 98 module_print("Cannot %sload kernel object `%s'" 99 " error=%d", autoload ? "auto" : "", name, error); 100 return error; 101 } 102 103 /* 104 * Load and process <module>.plist if it exists. 105 */ 106 if (((flags & MODCTL_NO_PROP) == 0 && filedictp) || autoload) { 107 error = module_load_plist_vfs(path, nochroot, &moduledict); 108 if (error != 0) { 109 module_print("plist load returned error %d for `%s'", 110 error, path); 111 if (error != ENOENT) 112 goto fail; 113 } else if (autoload) { 114 noload = prop_dictionary_get(moduledict, "noautoload"); 115 if (noload != NULL && prop_bool_true(noload)) { 116 module_error("autoloading is disallowed for %s", 117 path); 118 prop_object_release(moduledict); 119 error = EPERM; 120 goto fail; 121 } 122 } 123 if (error == 0) { /* can get here if error == ENOENT */ 124 if ((flags & MODCTL_NO_PROP) == 0 && filedictp) 125 *filedictp = moduledict; 126 else 127 prop_object_release(moduledict); 128 } 129 } 130 131 PNBUF_PUT(path); 132 return 0; 133 134 fail: 135 kobj_unload(mod->mod_kobj); 136 PNBUF_PUT(path); 137 return error; 138 } 139 140 /* 141 * module_load_plist_vfs: 142 * 143 * Load a plist located in the file system into memory. 144 */ 145 static int 146 module_load_plist_vfs(const char *modpath, const bool nochroot, 147 prop_dictionary_t *filedictp) 148 { 149 struct pathbuf *pb; 150 struct nameidata nd; 151 struct stat sb; 152 void *base; 153 char *proppath; 154 const size_t plistsize = 8192; 155 size_t resid; 156 int error, pathlen; 157 158 KASSERT(filedictp != NULL); 159 base = NULL; 160 161 proppath = PNBUF_GET(); 162 strcpy(proppath, modpath); 163 pathlen = strlen(proppath); 164 if ((pathlen >= 6) && (strcmp(&proppath[pathlen - 5], ".kmod") == 0)) { 165 strcpy(&proppath[pathlen - 5], ".plist"); 166 } else if (pathlen < MAXPATHLEN - 6) { 167 strcat(proppath, ".plist"); 168 } else { 169 error = ENOENT; 170 goto out1; 171 } 172 173 /* XXX this makes an unnecessary extra copy of the path */ 174 pb = pathbuf_create(proppath); 175 if (pb == NULL) { 176 error = ENOMEM; 177 goto out1; 178 } 179 180 NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), pb); 181 182 error = vn_open(&nd, FREAD, 0); 183 if (error != 0) { 184 goto out2; 185 } 186 187 error = vn_stat(nd.ni_vp, &sb); 188 if (error != 0) { 189 goto out3; 190 } 191 if (sb.st_size >= (plistsize - 1)) { /* leave space for term \0 */ 192 error = EFBIG; 193 goto out3; 194 } 195 196 base = kmem_alloc(plistsize, KM_SLEEP); 197 if (base == NULL) { 198 error = ENOMEM; 199 goto out3; 200 } 201 202 error = vn_rdwr(UIO_READ, nd.ni_vp, base, sb.st_size, 0, 203 UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, curlwp); 204 *((uint8_t *)base + sb.st_size) = '\0'; 205 if (error == 0 && resid != 0) { 206 error = EFBIG; 207 } 208 if (error != 0) { 209 kmem_free(base, plistsize); 210 base = NULL; 211 goto out3; 212 } 213 214 *filedictp = prop_dictionary_internalize(base); 215 if (*filedictp == NULL) { 216 error = EINVAL; 217 } 218 kmem_free(base, plistsize); 219 base = NULL; 220 KASSERT(error == 0); 221 222 out3: 223 VOP_UNLOCK(nd.ni_vp); 224 vn_close(nd.ni_vp, FREAD, kauth_cred_get()); 225 226 out2: 227 pathbuf_destroy(pb); 228 229 out1: 230 PNBUF_PUT(proppath); 231 return error; 232 } 233