1 /* $NetBSD: sys_module.c,v 1.4 2008/03/02 11:18:43 jmmv 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * System calls relating to loadable modules. 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: sys_module.c,v 1.4 2008/03/02 11:18:43 jmmv Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/proc.h> 46 #include <sys/namei.h> 47 #include <sys/kauth.h> 48 #include <sys/kobj.h> 49 #include <sys/kmem.h> 50 #include <sys/malloc.h> 51 #include <sys/module.h> 52 #include <sys/kauth.h> 53 #include <sys/syscall.h> 54 #include <sys/syscallargs.h> 55 56 static 57 int 58 handle_modctl_load(void *arg) 59 { 60 modctl_load_t *ml = (modctl_load_t *)arg; 61 62 char *path; 63 char *props; 64 int error; 65 prop_dictionary_t dict; 66 size_t propslen; 67 68 if ((ml->ml_props != NULL && ml->ml_propslen == 0) || 69 (ml->ml_props == NULL && ml->ml_propslen > 0)) { 70 error = EINVAL; 71 goto out1; 72 } 73 74 path = PNBUF_GET(); 75 error = copyinstr(ml->ml_filename, path, MAXPATHLEN, NULL); 76 if (error != 0) 77 goto out2; 78 79 propslen = ml->ml_propslen + 1; 80 props = (char *)malloc(propslen, M_TEMP, M_WAITOK|M_CANFAIL); 81 if (props == NULL) { 82 error = ENOMEM; 83 goto out2; 84 } 85 86 error = copyinstr(ml->ml_props, props, propslen, NULL); 87 if (error != 0) 88 goto out3; 89 90 dict = prop_dictionary_internalize(props); 91 if (dict == NULL) { 92 error = EINVAL; 93 goto out3; 94 } 95 96 error = module_load(path, ml->ml_flags, dict); 97 98 prop_object_release(dict); 99 100 out3: 101 free(props, M_TEMP); 102 out2: 103 PNBUF_PUT(path); 104 out1: 105 106 return error; 107 } 108 109 int 110 sys_modctl(struct lwp *l, const struct sys_modctl_args *uap, 111 register_t *retval) 112 { 113 /* { 114 syscallarg(int) cmd; 115 syscallarg(void *) arg; 116 } */ 117 char buf[MAXMODNAME]; 118 size_t mslen; 119 module_t *mod; 120 modinfo_t *mi; 121 modstat_t *ms, *mso; 122 vaddr_t addr; 123 size_t size; 124 struct iovec iov; 125 int error; 126 void *arg; 127 128 arg = SCARG(uap, arg); 129 130 switch (SCARG(uap, cmd)) { 131 case MODCTL_LOAD: 132 case MODCTL_UNLOAD: 133 /* Authorize. */ 134 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MODULE, 135 0, (void *)(uintptr_t)SCARG(uap, cmd), NULL, NULL); 136 if (error != 0) { 137 return error; 138 } 139 break; 140 default: 141 break; 142 } 143 144 switch (SCARG(uap, cmd)) { 145 case MODCTL_LOAD: 146 error = handle_modctl_load(arg); 147 break; 148 149 case MODCTL_UNLOAD: 150 error = copyinstr(arg, buf, sizeof(buf), NULL); 151 if (error == 0) { 152 error = module_unload(buf); 153 } 154 break; 155 156 case MODCTL_STAT: 157 error = copyin(arg, &iov, sizeof(iov)); 158 if (error != 0) { 159 break; 160 } 161 mutex_enter(&module_lock); 162 mslen = (module_count + 1) * sizeof(modstat_t); 163 mso = kmem_zalloc(mslen, KM_SLEEP); 164 if (mso == NULL) { 165 mutex_exit(&module_lock); 166 return ENOMEM; 167 } 168 ms = mso; 169 TAILQ_FOREACH(mod, &module_list, mod_chain) { 170 mi = mod->mod_info; 171 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 172 if (mi->mi_required != NULL) { 173 strlcpy(ms->ms_required, mi->mi_required, 174 sizeof(ms->ms_required)); 175 } 176 if (mod->mod_kobj != NULL) { 177 kobj_stat(mod->mod_kobj, &addr, &size); 178 ms->ms_addr = addr; 179 ms->ms_size = size; 180 } 181 ms->ms_class = mi->mi_class; 182 ms->ms_refcnt = mod->mod_refcnt; 183 ms->ms_source = mod->mod_source; 184 ms++; 185 } 186 mutex_exit(&module_lock); 187 error = copyout(mso, iov.iov_base, 188 min(mslen - sizeof(modstat_t), iov.iov_len)); 189 kmem_free(mso, mslen); 190 if (error == 0) { 191 iov.iov_len = mslen - sizeof(modstat_t); 192 error = copyout(&iov, arg, sizeof(iov)); 193 } 194 break; 195 196 default: 197 error = EINVAL; 198 break; 199 } 200 201 return error; 202 } 203