1 /* $NetBSD: sys_module.c,v 1.11 2010/03/05 18:35:01 pooka 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 1.11 2010/03/05 18:35:01 pooka 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/kmem.h> 41 #include <sys/kobj.h> 42 #include <sys/module.h> 43 #include <sys/syscall.h> 44 #include <sys/syscallargs.h> 45 46 static int 47 handle_modctl_load(modctl_load_t *ml) 48 { 49 char *path; 50 char *props; 51 int error; 52 prop_dictionary_t dict; 53 size_t propslen; 54 55 if ((ml->ml_props != NULL && ml->ml_propslen == 0) || 56 (ml->ml_props == NULL && ml->ml_propslen > 0)) { 57 error = EINVAL; 58 goto out1; 59 } 60 61 path = PNBUF_GET(); 62 error = copyinstr(ml->ml_filename, path, MAXPATHLEN, NULL); 63 if (error != 0) 64 goto out2; 65 66 if (ml->ml_props != NULL) { 67 propslen = ml->ml_propslen + 1; 68 props = (char *)kmem_alloc(propslen, KM_SLEEP); 69 if (props == NULL) { 70 error = ENOMEM; 71 goto out2; 72 } 73 74 error = copyinstr(ml->ml_props, props, propslen, NULL); 75 if (error != 0) 76 goto out3; 77 78 dict = prop_dictionary_internalize(props); 79 if (dict == NULL) { 80 error = EINVAL; 81 goto out3; 82 } 83 } else { 84 dict = NULL; 85 props = NULL; 86 } 87 88 error = module_load(path, ml->ml_flags, dict, MODULE_CLASS_ANY); 89 90 if (dict != NULL) { 91 prop_object_release(dict); 92 } 93 94 out3: 95 if (props != NULL) { 96 kmem_free(props, propslen); 97 } 98 out2: 99 PNBUF_PUT(path); 100 out1: 101 102 return error; 103 } 104 105 int 106 sys_modctl(struct lwp *l, const struct sys_modctl_args *uap, 107 register_t *retval) 108 { 109 /* { 110 syscallarg(int) cmd; 111 syscallarg(void *) arg; 112 } */ 113 char buf[MAXMODNAME]; 114 size_t mslen; 115 module_t *mod; 116 modinfo_t *mi; 117 modstat_t *ms, *mso; 118 vaddr_t addr; 119 size_t size; 120 struct iovec iov; 121 modctl_load_t ml; 122 int error; 123 void *arg; 124 125 arg = SCARG(uap, arg); 126 127 switch (SCARG(uap, cmd)) { 128 case MODCTL_LOAD: 129 error = copyin(arg, &ml, sizeof(ml)); 130 if (error != 0) 131 break; 132 error = handle_modctl_load(&ml); 133 break; 134 135 case MODCTL_UNLOAD: 136 error = copyinstr(arg, buf, sizeof(buf), NULL); 137 if (error == 0) { 138 error = module_unload(buf); 139 } 140 break; 141 142 case MODCTL_STAT: 143 error = copyin(arg, &iov, sizeof(iov)); 144 if (error != 0) { 145 break; 146 } 147 mutex_enter(&module_lock); 148 mslen = (module_count+module_builtinlist+1) * sizeof(modstat_t); 149 mso = kmem_zalloc(mslen, KM_SLEEP); 150 if (mso == NULL) { 151 mutex_exit(&module_lock); 152 return ENOMEM; 153 } 154 ms = mso; 155 TAILQ_FOREACH(mod, &module_list, mod_chain) { 156 mi = mod->mod_info; 157 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 158 if (mi->mi_required != NULL) { 159 strlcpy(ms->ms_required, mi->mi_required, 160 sizeof(ms->ms_required)); 161 } 162 if (mod->mod_kobj != NULL) { 163 kobj_stat(mod->mod_kobj, &addr, &size); 164 ms->ms_addr = addr; 165 ms->ms_size = size; 166 } 167 ms->ms_class = mi->mi_class; 168 ms->ms_refcnt = mod->mod_refcnt; 169 ms->ms_source = mod->mod_source; 170 ms++; 171 } 172 TAILQ_FOREACH(mod, &module_builtins, mod_chain) { 173 mi = mod->mod_info; 174 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 175 if (mi->mi_required != NULL) { 176 strlcpy(ms->ms_required, mi->mi_required, 177 sizeof(ms->ms_required)); 178 } 179 if (mod->mod_kobj != NULL) { 180 kobj_stat(mod->mod_kobj, &addr, &size); 181 ms->ms_addr = addr; 182 ms->ms_size = size; 183 } 184 ms->ms_class = mi->mi_class; 185 ms->ms_refcnt = -1; 186 KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL); 187 ms->ms_source = mod->mod_source; 188 ms++; 189 } 190 mutex_exit(&module_lock); 191 error = copyout(mso, iov.iov_base, 192 min(mslen - sizeof(modstat_t), iov.iov_len)); 193 kmem_free(mso, mslen); 194 if (error == 0) { 195 iov.iov_len = mslen - sizeof(modstat_t); 196 error = copyout(&iov, arg, sizeof(iov)); 197 } 198 break; 199 200 default: 201 error = EINVAL; 202 break; 203 } 204 205 return error; 206 } 207