247 lines
5.8 KiB
C
247 lines
5.8 KiB
C
/* $NetBSD: sys_module.c,v 1.22 2017/06/01 02:45:13 chs Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* System calls relating to loadable modules.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: sys_module.c,v 1.22 2017/06/01 02:45:13 chs Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_modular.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/namei.h>
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#include <sys/kauth.h>
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#include <sys/kmem.h>
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#include <sys/kobj.h>
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#include <sys/module.h>
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#include <sys/syscall.h>
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#include <sys/syscallargs.h>
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/*
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* Arbitrary limit to avoid DoS for excessive memory allocation.
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*/
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#define MAXPROPSLEN 4096
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int
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handle_modctl_load(const char *ml_filename, int ml_flags, const char *ml_props,
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size_t ml_propslen)
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{
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char *path;
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char *props;
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int error;
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prop_dictionary_t dict;
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size_t propslen = 0;
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if ((ml_props != NULL && ml_propslen == 0) ||
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(ml_props == NULL && ml_propslen > 0)) {
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return EINVAL;
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}
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path = PNBUF_GET();
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error = copyinstr(ml_filename, path, MAXPATHLEN, NULL);
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if (error != 0)
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goto out1;
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if (ml_props != NULL) {
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if (ml_propslen > MAXPROPSLEN) {
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error = ENOMEM;
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goto out1;
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}
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propslen = ml_propslen + 1;
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props = kmem_alloc(propslen, KM_SLEEP);
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error = copyinstr(ml_props, props, propslen, NULL);
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if (error != 0)
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goto out2;
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dict = prop_dictionary_internalize(props);
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if (dict == NULL) {
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error = EINVAL;
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goto out2;
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}
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} else {
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dict = NULL;
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props = NULL;
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}
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error = module_load(path, ml_flags, dict, MODULE_CLASS_ANY);
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if (dict != NULL) {
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prop_object_release(dict);
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}
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out2:
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if (props != NULL) {
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kmem_free(props, propslen);
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}
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out1:
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PNBUF_PUT(path);
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return error;
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}
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static int
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handle_modctl_stat(struct iovec *iov, void *arg)
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{
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modstat_t *ms, *mso;
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modinfo_t *mi;
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module_t *mod;
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vaddr_t addr;
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size_t size;
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size_t mslen;
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int error;
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kernconfig_lock();
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mslen = (module_count+module_builtinlist+1) * sizeof(modstat_t);
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mso = kmem_zalloc(mslen, KM_SLEEP);
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ms = mso;
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TAILQ_FOREACH(mod, &module_list, mod_chain) {
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mi = mod->mod_info;
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strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name));
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if (mi->mi_required != NULL) {
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strlcpy(ms->ms_required, mi->mi_required,
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sizeof(ms->ms_required));
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}
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if (mod->mod_kobj != NULL) {
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kobj_stat(mod->mod_kobj, &addr, &size);
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ms->ms_addr = addr;
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ms->ms_size = size;
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}
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ms->ms_class = mi->mi_class;
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ms->ms_refcnt = mod->mod_refcnt;
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ms->ms_source = mod->mod_source;
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ms->ms_flags = mod->mod_flags;
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ms++;
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}
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TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
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mi = mod->mod_info;
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strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name));
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if (mi->mi_required != NULL) {
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strlcpy(ms->ms_required, mi->mi_required,
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sizeof(ms->ms_required));
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}
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if (mod->mod_kobj != NULL) {
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kobj_stat(mod->mod_kobj, &addr, &size);
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ms->ms_addr = addr;
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ms->ms_size = size;
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}
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ms->ms_class = mi->mi_class;
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ms->ms_refcnt = -1;
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KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL);
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ms->ms_source = mod->mod_source;
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ms++;
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}
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kernconfig_unlock();
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error = copyout(mso, iov->iov_base,
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min(mslen - sizeof(modstat_t), iov->iov_len));
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kmem_free(mso, mslen);
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if (error == 0) {
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iov->iov_len = mslen - sizeof(modstat_t);
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error = copyout(iov, arg, sizeof(*iov));
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}
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return error;
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}
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int
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sys_modctl(struct lwp *l, const struct sys_modctl_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(int) cmd;
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syscallarg(void *) arg;
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} */
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char buf[MAXMODNAME];
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struct iovec iov;
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modctl_load_t ml;
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int error;
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void *arg;
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#ifdef MODULAR
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uintptr_t loadtype;
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#endif
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arg = SCARG(uap, arg);
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switch (SCARG(uap, cmd)) {
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case MODCTL_LOAD:
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error = copyin(arg, &ml, sizeof(ml));
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if (error != 0)
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break;
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error = handle_modctl_load(ml.ml_filename, ml.ml_flags,
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ml.ml_props, ml.ml_propslen);
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break;
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case MODCTL_UNLOAD:
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error = copyinstr(arg, buf, sizeof(buf), NULL);
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if (error == 0) {
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error = module_unload(buf);
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}
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break;
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case MODCTL_STAT:
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error = copyin(arg, &iov, sizeof(iov));
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if (error != 0) {
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break;
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}
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error = handle_modctl_stat(&iov, arg);
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break;
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case MODCTL_EXISTS:
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#ifndef MODULAR
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error = ENOSYS;
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#else
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loadtype = (uintptr_t)arg;
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switch (loadtype) { /* 0 = modload, 1 = autoload */
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case 0: /* FALLTHROUGH */
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case 1:
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error = kauth_authorize_system(kauth_cred_get(),
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KAUTH_SYSTEM_MODULE, 0,
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(void *)(uintptr_t)MODCTL_LOAD,
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(void *)loadtype, NULL);
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break;
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default:
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error = EINVAL;
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break;
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}
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#endif
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break;
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default:
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error = EINVAL;
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break;
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}
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return error;
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}
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