1 /* $NetBSD: kern_module_vfs.c,v 1.13 2014/12/02 13:00:38 pooka 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 1.13 2014/12/02 13:00:38 pooka 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 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 85 } else 86 error = ENOENT; 87 } 88 if (autoload || (error == ENOENT)) { 89 if (strchr(name, '/') == NULL) { 90 nochroot = true; 91 snprintf(path, MAXPATHLEN, "%s/%s/%s.kmod", 92 module_base, name, name); 93 error = kobj_load_vfs(&mod->mod_kobj, path, nochroot); 94 } else 95 error = ENOENT; 96 } 97 if (error != 0) { 98 PNBUF_PUT(path); 99 module_print("Cannot %sload kernel object `%s'" 100 " error=%d", autoload ? "auto" : "", name, error); 101 return error; 102 } 103 104 /* 105 * Load and process <module>.plist if it exists. 106 */ 107 if (((flags & MODCTL_NO_PROP) == 0 && filedictp) || autoload) { 108 error = module_load_plist_vfs(path, nochroot, &moduledict); 109 if (error != 0) { 110 module_print("plist load returned error %d for `%s'", 111 error, path); 112 if (error != ENOENT) 113 goto fail; 114 } else if (autoload) { 115 noload = prop_dictionary_get(moduledict, "noautoload"); 116 if (noload != NULL && prop_bool_true(noload)) { 117 module_error("autoloading is disallowed for %s", 118 path); 119 prop_object_release(moduledict); 120 error = EPERM; 121 goto fail; 122 } 123 } 124 if (error == 0) { /* can get here if error == ENOENT */ 125 if ((flags & MODCTL_NO_PROP) == 0 && filedictp) 126 *filedictp = moduledict; 127 else 128 prop_object_release(moduledict); 129 } 130 } 131 132 PNBUF_PUT(path); 133 return 0; 134 135 fail: 136 kobj_unload(mod->mod_kobj); 137 PNBUF_PUT(path); 138 return error; 139 } 140 141 /* 142 * module_load_plist_vfs: 143 * 144 * Load a plist located in the file system into memory. 145 */ 146 static int 147 module_load_plist_vfs(const char *modpath, const bool nochroot, 148 prop_dictionary_t *filedictp) 149 { 150 struct pathbuf *pb; 151 struct nameidata nd; 152 struct stat sb; 153 void *base; 154 char *proppath; 155 const size_t plistsize = 8192; 156 size_t resid; 157 int error, pathlen; 158 159 KASSERT(filedictp != NULL); 160 base = NULL; 161 162 proppath = PNBUF_GET(); 163 strcpy(proppath, modpath); 164 pathlen = strlen(proppath); 165 if ((pathlen >= 6) && (strcmp(&proppath[pathlen - 5], ".kmod") == 0)) { 166 strcpy(&proppath[pathlen - 5], ".plist"); 167 } else if (pathlen < MAXPATHLEN - 6) { 168 strcat(proppath, ".plist"); 169 } else { 170 error = ENOENT; 171 goto out1; 172 } 173 174 /* XXX this makes an unnecessary extra copy of the path */ 175 pb = pathbuf_create(proppath); 176 if (pb == NULL) { 177 error = ENOMEM; 178 goto out1; 179 } 180 181 NDINIT(&nd, LOOKUP, FOLLOW | (nochroot ? NOCHROOT : 0), pb); 182 183 error = vn_open(&nd, FREAD, 0); 184 if (error != 0) { 185 goto out2; 186 } 187 188 error = vn_stat(nd.ni_vp, &sb); 189 if (error != 0) { 190 goto out3; 191 } 192 if (sb.st_size >= (plistsize - 1)) { /* leave space for term \0 */ 193 error = EFBIG; 194 goto out3; 195 } 196 197 base = kmem_alloc(plistsize, KM_SLEEP); 198 if (base == NULL) { 199 error = ENOMEM; 200 goto out3; 201 } 202 203 error = vn_rdwr(UIO_READ, nd.ni_vp, base, sb.st_size, 0, 204 UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, curlwp); 205 *((uint8_t *)base + sb.st_size) = '\0'; 206 if (error == 0 && resid != 0) { 207 error = EFBIG; 208 } 209 if (error != 0) { 210 kmem_free(base, plistsize); 211 base = NULL; 212 goto out3; 213 } 214 215 *filedictp = prop_dictionary_internalize(base); 216 if (*filedictp == NULL) { 217 error = EINVAL; 218 } 219 kmem_free(base, plistsize); 220 base = NULL; 221 KASSERT(error == 0); 222 223 out3: 224 VOP_UNLOCK(nd.ni_vp); 225 vn_close(nd.ni_vp, FREAD, kauth_cred_get()); 226 227 out2: 228 pathbuf_destroy(pb); 229 230 out1: 231 PNBUF_PUT(proppath); 232 return error; 233 } 234