1 /* $NetBSD: kern_module_vfs.c,v 1.10 2010/11/28 00:26:38 jnemeth 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 1.10 2010/11/28 00:26:38 jnemeth 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 nochroot = false; 81 snprintf(path, MAXPATHLEN, "%s", name); 82 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 83 } 84 if (autoload || (error == ENOENT)) { 85 nochroot = true; 86 snprintf(path, MAXPATHLEN, "%s/%s/%s.kmod", 87 module_base, name, name); 88 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 89 } 90 if (error != 0) { 91 PNBUF_PUT(path); 92 if (autoload) { 93 module_print("Cannot load kernel object `%s'" 94 " error=%d", name, error); 95 } else { 96 module_error("Cannot load kernel object `%s'" 97 " error=%d", name, error); 98 } 99 return error; 100 } 101 102 /* 103 * Load and process <module>.plist if it exists. 104 */ 105 if (((flags & MODCTL_NO_PROP) == 0 && filedictp) || autoload) { 106 error = module_load_plist_vfs(path, nochroot, &moduledict); 107 if (error != 0) { 108 module_print("plist load returned error %d for `%s'", 109 error, path); 110 if (error != ENOENT) 111 goto fail; 112 } else if (autoload) { 113 noload = prop_dictionary_get(moduledict, "noautoload"); 114 if (noload != NULL && prop_bool_true(noload)) { 115 module_error("autoloading is disallowed for %s", 116 path); 117 error = EPERM; 118 goto fail; 119 } 120 } 121 if (error == 0) { /* can get here if error == ENOENT */ 122 if ((flags & MODCTL_NO_PROP) == 0 && filedictp) 123 *filedictp = moduledict; 124 else 125 prop_object_release(moduledict); 126 } 127 } 128 129 PNBUF_PUT(path); 130 return 0; 131 132 fail: 133 kobj_unload(mod->mod_kobj); 134 PNBUF_PUT(path); 135 return error; 136 } 137 138 /* 139 * module_load_plist_vfs: 140 * 141 * Load a plist located in the file system into memory. 142 */ 143 static int 144 module_load_plist_vfs(const char *modpath, const bool nochroot, 145 prop_dictionary_t *filedictp) 146 { 147 struct pathbuf *pb; 148 struct nameidata nd; 149 struct stat sb; 150 void *base; 151 char *proppath; 152 const size_t plistsize = 8192; 153 size_t resid; 154 int error, pathlen; 155 156 KASSERT(filedictp != NULL); 157 base = NULL; 158 159 proppath = PNBUF_GET(); 160 strcpy(proppath, modpath); 161 pathlen = strlen(proppath); 162 if ((pathlen >= 6) && (strcmp(&proppath[pathlen - 5], ".kmod") == 0)) { 163 strcpy(&proppath[pathlen - 5], ".plist"); 164 } else if (pathlen < MAXPATHLEN - 6) { 165 strcat(proppath, ".plist"); 166 } else { 167 error = ENOENT; 168 goto out1; 169 } 170 171 /* XXX this makes an unnecessary extra copy of the path */ 172 pb = pathbuf_create(proppath); 173 if (pb == NULL) { 174 error = ENOMEM; 175 goto out1; 176 } 177 178 NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), pb); 179 180 error = vn_open(&nd, FREAD, 0); 181 if (error != 0) { 182 goto out2; 183 } 184 185 error = vn_stat(nd.ni_vp, &sb); 186 if (error != 0) { 187 goto out3; 188 } 189 if (sb.st_size >= (plistsize - 1)) { /* leave space for term \0 */ 190 error = EFBIG; 191 goto out3; 192 } 193 194 base = kmem_alloc(plistsize, KM_SLEEP); 195 if (base == NULL) { 196 error = ENOMEM; 197 goto out3; 198 } 199 200 error = vn_rdwr(UIO_READ, nd.ni_vp, base, sb.st_size, 0, 201 UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, curlwp); 202 *((uint8_t *)base + sb.st_size) = '\0'; 203 if (error == 0 && resid != 0) { 204 error = EFBIG; 205 } 206 if (error != 0) { 207 kmem_free(base, plistsize); 208 base = NULL; 209 goto out3; 210 } 211 212 *filedictp = prop_dictionary_internalize(base); 213 if (*filedictp == NULL) { 214 error = EINVAL; 215 } 216 kmem_free(base, plistsize); 217 base = NULL; 218 KASSERT(error == 0); 219 220 out3: 221 VOP_UNLOCK(nd.ni_vp); 222 vn_close(nd.ni_vp, FREAD, kauth_cred_get()); 223 224 out2: 225 pathbuf_destroy(pb); 226 227 out1: 228 PNBUF_PUT(proppath); 229 return error; 230 } 231