1 /* $NetBSD: kern_module_vfs.c,v 1.19 2025/03/20 13:26:54 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 1.19 2025/03/20 13:26:54 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 ((!ISSET(flags, MODCTL_NO_PROP) && 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 " 120 "`%s'", 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 (!ISSET(flags, MODCTL_NO_PROP) && 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 vnode *vp; 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 strlcpy(proppath, modpath, MAXPATHLEN); 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 error = vn_open(NULL, pb, (nochroot ? NOCHROOT : 0), FREAD, 0, 185 &vp, NULL, NULL); 186 if (error != 0) { 187 goto out2; 188 } 189 190 error = vn_stat(vp, &sb); 191 if (error != 0) { 192 goto out3; 193 } 194 if (sb.st_size >= (plistsize - 1)) { /* leave space for term \0 */ 195 error = EFBIG; 196 goto out3; 197 } 198 199 base = kmem_alloc(plistsize, KM_SLEEP); 200 error = vn_rdwr(UIO_READ, 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(vp); 222 vn_close(vp, FREAD, kauth_cred_get()); 223 224 out2: 225 pathbuf_destroy(pb); 226 227 out1: 228 PNBUF_PUT(proppath); 229 return error; 230 } 231
Indexes created Sat Sep 20 22:09:52 GMT 2025