1 /* $NetBSD: sys_module.c,v 1.14 2012/08/07 01:19:05 jnemeth Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * System calls relating to loadable modules. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: sys_module.c,v 1.14 2012/08/07 01:19:05 jnemeth Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/namei.h> 40 #include <sys/kauth.h> 41 #include <sys/kmem.h> 42 #include <sys/kobj.h> 43 #include <sys/module.h> 44 #include <sys/syscall.h> 45 #include <sys/syscallargs.h> 46 47 #include <opt_modular.h> 48 49 static int 50 handle_modctl_load(modctl_load_t *ml) 51 { 52 char *path; 53 char *props; 54 int error; 55 prop_dictionary_t dict; 56 size_t propslen = 0; 57 58 if ((ml->ml_props != NULL && ml->ml_propslen == 0) || 59 (ml->ml_props == NULL && ml->ml_propslen > 0)) { 60 error = EINVAL; 61 goto out1; 62 } 63 64 path = PNBUF_GET(); 65 error = copyinstr(ml->ml_filename, path, MAXPATHLEN, NULL); 66 if (error != 0) 67 goto out2; 68 69 if (ml->ml_props != NULL) { 70 propslen = ml->ml_propslen + 1; 71 props = (char *)kmem_alloc(propslen, KM_SLEEP); 72 if (props == NULL) { 73 error = ENOMEM; 74 goto out2; 75 } 76 77 error = copyinstr(ml->ml_props, props, propslen, NULL); 78 if (error != 0) 79 goto out3; 80 81 dict = prop_dictionary_internalize(props); 82 if (dict == NULL) { 83 error = EINVAL; 84 goto out3; 85 } 86 } else { 87 dict = NULL; 88 props = NULL; 89 } 90 91 error = module_load(path, ml->ml_flags, dict, MODULE_CLASS_ANY); 92 93 if (dict != NULL) { 94 prop_object_release(dict); 95 } 96 97 out3: 98 if (props != NULL) { 99 kmem_free(props, propslen); 100 } 101 out2: 102 PNBUF_PUT(path); 103 out1: 104 105 return error; 106 } 107 108 int 109 sys_modctl(struct lwp *l, const struct sys_modctl_args *uap, 110 register_t *retval) 111 { 112 /* { 113 syscallarg(int) cmd; 114 syscallarg(void *) arg; 115 } */ 116 char buf[MAXMODNAME]; 117 size_t mslen; 118 module_t *mod; 119 modinfo_t *mi; 120 modstat_t *ms, *mso; 121 vaddr_t addr; 122 size_t size; 123 struct iovec iov; 124 modctl_load_t ml; 125 int error; 126 void *arg; 127 #ifdef MODULAR 128 uintptr_t loadtype; 129 #endif 130 131 arg = SCARG(uap, arg); 132 133 switch (SCARG(uap, cmd)) { 134 case MODCTL_LOAD: 135 error = copyin(arg, &ml, sizeof(ml)); 136 if (error != 0) 137 break; 138 error = handle_modctl_load(&ml); 139 break; 140 141 case MODCTL_UNLOAD: 142 error = copyinstr(arg, buf, sizeof(buf), NULL); 143 if (error == 0) { 144 error = module_unload(buf); 145 } 146 break; 147 148 case MODCTL_STAT: 149 error = copyin(arg, &iov, sizeof(iov)); 150 if (error != 0) { 151 break; 152 } 153 kernconfig_lock(); 154 mslen = (module_count+module_builtinlist+1) * sizeof(modstat_t); 155 mso = kmem_zalloc(mslen, KM_SLEEP); 156 if (mso == NULL) { 157 kernconfig_unlock(); 158 return ENOMEM; 159 } 160 ms = mso; 161 TAILQ_FOREACH(mod, &module_list, mod_chain) { 162 mi = mod->mod_info; 163 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 164 if (mi->mi_required != NULL) { 165 strlcpy(ms->ms_required, mi->mi_required, 166 sizeof(ms->ms_required)); 167 } 168 if (mod->mod_kobj != NULL) { 169 kobj_stat(mod->mod_kobj, &addr, &size); 170 ms->ms_addr = addr; 171 ms->ms_size = size; 172 } 173 ms->ms_class = mi->mi_class; 174 ms->ms_refcnt = mod->mod_refcnt; 175 ms->ms_source = mod->mod_source; 176 ms++; 177 } 178 TAILQ_FOREACH(mod, &module_builtins, mod_chain) { 179 mi = mod->mod_info; 180 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 181 if (mi->mi_required != NULL) { 182 strlcpy(ms->ms_required, mi->mi_required, 183 sizeof(ms->ms_required)); 184 } 185 if (mod->mod_kobj != NULL) { 186 kobj_stat(mod->mod_kobj, &addr, &size); 187 ms->ms_addr = addr; 188 ms->ms_size = size; 189 } 190 ms->ms_class = mi->mi_class; 191 ms->ms_refcnt = -1; 192 KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL); 193 ms->ms_source = mod->mod_source; 194 ms++; 195 } 196 kernconfig_unlock(); 197 error = copyout(mso, iov.iov_base, 198 min(mslen - sizeof(modstat_t), iov.iov_len)); 199 kmem_free(mso, mslen); 200 if (error == 0) { 201 iov.iov_len = mslen - sizeof(modstat_t); 202 error = copyout(&iov, arg, sizeof(iov)); 203 } 204 break; 205 206 case MODCTL_EXISTS: 207 #ifndef MODULAR 208 error = ENOSYS; 209 #else 210 loadtype = (uintptr_t)arg; 211 switch (loadtype) { /* 0 = modload, 1 = autoload */ 212 case 0: /* FALLTHROUGH */ 213 case 1: 214 error = kauth_authorize_system(kauth_cred_get(), 215 KAUTH_SYSTEM_MODULE, 0, 216 (void *)(uintptr_t)MODCTL_LOAD, 217 (void *)loadtype, NULL); 218 break; 219 220 default: 221 error = EINVAL; 222 break; 223 } 224 #endif 225 break; 226 227 default: 228 error = EINVAL; 229 break; 230 } 231 232 return error; 233 } 234