1 /* $NetBSD: kern_module_vfs.c,v 1.3 2010/02/16 05:47:52 dholland 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 1.3 2010/02/16 05:47:52 dholland 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 int 56 module_load_vfs(const char *name, int flags, bool autoload, 57 module_t *mod, prop_dictionary_t *filedictp) 58 { 59 char *path; 60 bool nochroot; 61 int error; 62 63 nochroot = false; 64 error = 0; 65 path = NULL; 66 if (filedictp) 67 *filedictp = NULL; 68 path = PNBUF_GET(); 69 70 if (!autoload) { 71 nochroot = false; 72 snprintf(path, MAXPATHLEN, "%s", name); 73 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 74 } 75 if (autoload || (error == ENOENT)) { 76 nochroot = true; 77 snprintf(path, MAXPATHLEN, "%s/%s/%s.kmod", 78 module_base, name, name); 79 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 80 } 81 if (error != 0) { 82 PNBUF_PUT(path); 83 if (autoload) { 84 module_print("Cannot load kernel object `%s'" 85 " error=%d", name, error); 86 } else { 87 module_error("Cannot load kernel object `%s'" 88 " error=%d", name, error); 89 } 90 return error; 91 } 92 93 /* 94 * Load and process <module>.prop if it exists. 95 */ 96 if ((flags & MODCTL_NO_PROP) == 0 && filedictp) { 97 error = module_load_plist_vfs(path, nochroot, filedictp); 98 if (error != 0) { 99 module_print("plist load returned error %d for `%s'", 100 error, path); 101 if (error != ENOENT) 102 goto fail; 103 } 104 } 105 106 PNBUF_PUT(path); 107 return 0; 108 109 fail: 110 kobj_unload(mod->mod_kobj); 111 PNBUF_PUT(path); 112 return error; 113 } 114 115 /* 116 * module_load_plist_vfs: 117 * 118 * Load a plist located in the file system into memory. 119 */ 120 static int 121 module_load_plist_vfs(const char *modpath, const bool nochroot, 122 prop_dictionary_t *filedictp) 123 { 124 struct nameidata nd; 125 struct stat sb; 126 void *base; 127 char *proppath; 128 const size_t plistsize = 8192; 129 size_t resid; 130 int error, pathlen; 131 132 KASSERT(filedictp != NULL); 133 base = NULL; 134 135 proppath = PNBUF_GET(); 136 strcpy(proppath, modpath); 137 pathlen = strlen(proppath); 138 if ((pathlen >= 5) && (strcmp(&proppath[pathlen - 5], ".kmod") == 0)) { 139 strcpy(&proppath[pathlen - 5], ".prop"); 140 } else if (pathlen < MAXPATHLEN - 5) { 141 strcat(proppath, ".prop"); 142 } else { 143 error = ENOENT; 144 goto out1; 145 } 146 147 NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), 148 UIO_SYSSPACE, proppath); 149 150 error = namei(&nd); 151 if (error != 0) { 152 goto out1; 153 } 154 155 error = vn_stat(nd.ni_vp, &sb); 156 if (error != 0) { 157 goto out1; 158 } 159 if (sb.st_size >= (plistsize - 1)) { /* leave space for term \0 */ 160 error = EFBIG; 161 goto out1; 162 } 163 164 error = vn_open(&nd, FREAD, 0); 165 if (error != 0) { 166 goto out1; 167 } 168 169 base = kmem_alloc(plistsize, KM_SLEEP); 170 if (base == NULL) { 171 error = ENOMEM; 172 goto out; 173 } 174 175 error = vn_rdwr(UIO_READ, nd.ni_vp, base, sb.st_size, 0, 176 UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, curlwp); 177 *((uint8_t *)base + sb.st_size) = '\0'; 178 if (error == 0 && resid != 0) { 179 error = EFBIG; 180 } 181 if (error != 0) { 182 kmem_free(base, plistsize); 183 base = NULL; 184 goto out; 185 } 186 187 *filedictp = prop_dictionary_internalize(base); 188 if (*filedictp == NULL) { 189 error = EINVAL; 190 } 191 kmem_free(base, plistsize); 192 base = NULL; 193 KASSERT(error == 0); 194 195 out: 196 VOP_UNLOCK(nd.ni_vp, 0); 197 vn_close(nd.ni_vp, FREAD, kauth_cred_get()); 198 199 out1: 200 PNBUF_PUT(proppath); 201 return error; 202 } 203