1 /* $NetBSD: sys_module.c,v 1.3 2008/01/17 22:30:54 rumble 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 1.3 2008/01/17 22:30:54 rumble 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/module.h> 51 #include <sys/kauth.h> 52 #include <sys/syscall.h> 53 #include <sys/syscallargs.h> 54 55 int 56 sys_modctl(struct lwp *l, const struct sys_modctl_args *uap, 57 register_t *retval) 58 { 59 /* { 60 syscallarg(int) cmd; 61 syscallarg(void *) arg; 62 } */ 63 char buf[MAXMODNAME]; 64 size_t mslen; 65 module_t *mod; 66 modinfo_t *mi; 67 modstat_t *ms, *mso; 68 vaddr_t addr; 69 size_t size; 70 struct iovec iov; 71 int error; 72 void *arg; 73 char *path; 74 75 arg = SCARG(uap, arg); 76 77 switch (SCARG(uap, cmd)) { 78 case MODCTL_LOAD: 79 case MODCTL_FORCELOAD: 80 case MODCTL_UNLOAD: 81 /* Authorize. */ 82 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MODULE, 83 0, (void *)(uintptr_t)SCARG(uap, cmd), NULL, NULL); 84 if (error != 0) { 85 return error; 86 } 87 break; 88 default: 89 break; 90 } 91 92 switch (SCARG(uap, cmd)) { 93 case MODCTL_FORCELOAD: 94 case MODCTL_LOAD: 95 path = PNBUF_GET(); 96 error = copyinstr(arg, path, MAXPATHLEN, NULL); 97 if (error == 0) { 98 error = module_load(path, 99 SCARG(uap, cmd) == MODCTL_FORCELOAD); 100 } 101 PNBUF_PUT(path); 102 break; 103 104 case MODCTL_UNLOAD: 105 error = copyinstr(arg, buf, sizeof(buf), NULL); 106 if (error == 0) { 107 error = module_unload(buf); 108 } 109 break; 110 111 case MODCTL_STAT: 112 error = copyin(arg, &iov, sizeof(iov)); 113 if (error != 0) { 114 break; 115 } 116 mutex_enter(&module_lock); 117 mslen = (module_count + 1) * sizeof(modstat_t); 118 mso = kmem_zalloc(mslen, KM_SLEEP); 119 if (mso == NULL) { 120 mutex_exit(&module_lock); 121 return ENOMEM; 122 } 123 ms = mso; 124 TAILQ_FOREACH(mod, &module_list, mod_chain) { 125 mi = mod->mod_info; 126 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 127 if (mi->mi_required != NULL) { 128 strlcpy(ms->ms_required, mi->mi_required, 129 sizeof(ms->ms_required)); 130 } 131 if (mod->mod_kobj != NULL) { 132 kobj_stat(mod->mod_kobj, &addr, &size); 133 ms->ms_addr = addr; 134 ms->ms_size = size; 135 } 136 ms->ms_class = mi->mi_class; 137 ms->ms_refcnt = mod->mod_refcnt; 138 ms->ms_source = mod->mod_source; 139 ms++; 140 } 141 mutex_exit(&module_lock); 142 error = copyout(mso, iov.iov_base, 143 min(mslen - sizeof(modstat_t), iov.iov_len)); 144 kmem_free(mso, mslen); 145 if (error == 0) { 146 iov.iov_len = mslen - sizeof(modstat_t); 147 error = copyout(&iov, arg, sizeof(iov)); 148 } 149 break; 150 151 default: 152 error = EINVAL; 153 break; 154 } 155 156 return error; 157 } 158