/* $NetBSD: kern_mod_80.c,v 1.6 2019/12/12 02:15:42 pgoyette Exp $ */

/* $NetBSD: kern_mod_80.c,v 1.6 2019/12/12 02:15:42 pgoyette Exp $ */

/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* System calls relating to loadable modules.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_mod_80.c,v 1.6 2019/12/12 02:15:42 pgoyette Exp $");

#ifdef _KERNEL_OPT
#include "opt_compat_netbsd.h"
#include "opt_modular.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <sys/kobj.h>
#include <sys/module.h>
#include <sys/syscall.h>
#include <sys/syscallargs.h>
#include <sys/compat_stub.h>

#include <compat/sys/module.h>

#include <compat/common/compat_mod.h>

static int
compat_80_modstat(int cmd, struct iovec *iov, void *arg)
{
omodstat_t *oms, *omso;
modinfo_t *mi;
module_t *mod;
vaddr_t addr;
size_t size;
size_t omslen;
size_t used;
int error;
int omscnt;
bool stataddr;
const char *suffix = "...";

if (cmd != MODCTL_OSTAT)
return EINVAL;

error = copyin(arg, iov, sizeof(*iov));
if (error != 0) {
return error;
}

/* If not privileged, don't expose kernel addresses. */
error = kauth_authorize_system(kauth_cred_get(), KAUTH_SYSTEM_MODULE,
0, (void *)(uintptr_t)MODCTL_STAT, NULL, NULL);
stataddr = (error == 0);

kernconfig_lock();
omscnt = 0;
TAILQ_FOREACH(mod, &module_list, mod_chain) {
omscnt++;
mi = mod->mod_info;
}
TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
omscnt++;
mi = mod->mod_info;
}
omslen = omscnt * sizeof(omodstat_t);
omso = kmem_zalloc(omslen, KM_SLEEP);
oms = omso;
TAILQ_FOREACH(mod, &module_list, mod_chain) {
mi = mod->mod_info;
strlcpy(oms->oms_name, mi->mi_name, sizeof(oms->oms_name));
if (mi->mi_required != NULL) {
used = strlcpy(oms->oms_required, mi->mi_required,
sizeof(oms->oms_required));
if (used >= sizeof(oms->oms_required)) {
oms->oms_required[sizeof(oms->oms_required) -
strlen(suffix) - 1] = '\0';
strlcat(oms->oms_required, suffix,
sizeof(oms->oms_required));
}
}
if (mod->mod_kobj != NULL && stataddr) {
kobj_stat(mod->mod_kobj, &addr, &size);
oms->oms_addr = addr;
oms->oms_size = size;
}
oms->oms_class = mi->mi_class;
oms->oms_refcnt = mod->mod_refcnt;
oms->oms_source = mod->mod_source;
oms->oms_flags = mod->mod_flags;
oms++;
}
TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
mi = mod->mod_info;
strlcpy(oms->oms_name, mi->mi_name, sizeof(oms->oms_name));
if (mi->mi_required != NULL) {
used = strlcpy(oms->oms_required, mi->mi_required,
sizeof(oms->oms_required));
if (used >= sizeof(oms->oms_required)) {
oms->oms_required[sizeof(oms->oms_required) -
strlen(suffix) - 1] = '\0';
strlcat(oms->oms_required, suffix,
sizeof(oms->oms_required));
}
}
if (mod->mod_kobj != NULL && stataddr) {
kobj_stat(mod->mod_kobj, &addr, &size);
oms->oms_addr = addr;
oms->oms_size = size;
}
oms->oms_class = mi->mi_class;
oms->oms_refcnt = -1;
KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL);
oms->oms_source = mod->mod_source;
oms++;
}
kernconfig_unlock();
error = copyout(omso, iov->iov_base, uimin(omslen, iov->iov_len));
kmem_free(omso, omslen);
if (error == 0) {
iov->iov_len = omslen;
error = copyout(iov, arg, sizeof(*iov));
}

return error;
}

void
kern_mod_80_init(void)
{

MODULE_HOOK_SET(compat_modstat_80_hook, compat_80_modstat);
}

void
kern_mod_80_fini(void)
{

MODULE_HOOK_UNSET(compat_modstat_80_hook);
}