The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_module.c

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    1 /*      $NetBSD: sys_module.c,v 1.8.4.1 2009/05/03 13:07:39 bouyer 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 1.8.4.1 2009/05/03 13:07:39 bouyer 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         propslen = ml->ml_propslen + 1;
   67         props = (char *)kmem_alloc(propslen, KM_SLEEP);
   68         if (props == NULL) {
   69                 error = ENOMEM;
   70                 goto out2;
   71         }
   72 
   73         error = copyinstr(ml->ml_props, props, propslen, NULL);
   74         if (error != 0)
   75                 goto out3;
   76 
   77         dict = prop_dictionary_internalize(props);
   78         if (dict == NULL) {
   79                 error = EINVAL;
   80                 goto out3;
   81         }
   82 
   83         error = module_load(path, ml->ml_flags, dict, MODULE_CLASS_ANY);
   84 
   85         prop_object_release(dict);
   86 
   87 out3:
   88         kmem_free(props, propslen);
   89 out2:
   90         PNBUF_PUT(path);
   91 out1:
   92 
   93         return error;
   94 }
   95 
   96 int
   97 sys_modctl(struct lwp *l, const struct sys_modctl_args *uap,
   98            register_t *retval)
   99 {
  100         /* {
  101                 syscallarg(int)         cmd;
  102                 syscallarg(void *)      arg;
  103         } */
  104         char buf[MAXMODNAME];
  105         size_t mslen;
  106         module_t *mod;
  107         modinfo_t *mi;
  108         modstat_t *ms, *mso;
  109         vaddr_t addr;
  110         size_t size;
  111         struct iovec iov;
  112         modctl_load_t ml;
  113         int error;
  114         void *arg;
  115 
  116         arg = SCARG(uap, arg);
  117 
  118         switch (SCARG(uap, cmd)) {
  119         case MODCTL_LOAD:
  120                 error = copyin(arg, &ml, sizeof(ml));
  121                 if (error != 0)
  122                         break;
  123                 error = handle_modctl_load(&ml);
  124                 break;
  125 
  126         case MODCTL_UNLOAD:
  127                 error = copyinstr(arg, buf, sizeof(buf), NULL);
  128                 if (error == 0) {
  129                         error = module_unload(buf);
  130                 }
  131                 break;
  132 
  133         case MODCTL_STAT:
  134                 error = copyin(arg, &iov, sizeof(iov));
  135                 if (error != 0) {
  136                         break;
  137                 }
  138                 mutex_enter(&module_lock);
  139                 mslen = (module_count + 1) * sizeof(modstat_t);
  140                 mso = kmem_zalloc(mslen, KM_SLEEP);
  141                 if (mso == NULL) {
  142                         mutex_exit(&module_lock);
  143                         return ENOMEM;
  144                 }
  145                 ms = mso;
  146                 TAILQ_FOREACH(mod, &module_list, mod_chain) {
  147                         mi = mod->mod_info;
  148                         strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name));
  149                         if (mi->mi_required != NULL) {
  150                                 strlcpy(ms->ms_required, mi->mi_required,
  151                                     sizeof(ms->ms_required));
  152                         }
  153                         if (mod->mod_kobj != NULL) {
  154                                 kobj_stat(mod->mod_kobj, &addr, &size);
  155                                 ms->ms_addr = addr;
  156                                 ms->ms_size = size;
  157                         }
  158                         ms->ms_class = mi->mi_class;
  159                         ms->ms_refcnt = mod->mod_refcnt;
  160                         ms->ms_source = mod->mod_source;
  161                         ms++;
  162                 }
  163                 mutex_exit(&module_lock);
  164                 error = copyout(mso, iov.iov_base,
  165                     min(mslen - sizeof(modstat_t), iov.iov_len));
  166                 kmem_free(mso, mslen);
  167                 if (error == 0) {
  168                         iov.iov_len = mslen - sizeof(modstat_t);
  169                         error = copyout(&iov, arg, sizeof(iov));
  170                 }
  171                 break;
  172 
  173         default:
  174                 error = EINVAL;
  175                 break;
  176         }
  177 
  178         return error;
  179 }

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