/*      $NetBSD: netbsd32_module.c,v 1.11 2022/05/24 06:20:04 andvar Exp $      */

/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software developed for The NetBSD Foundation.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: netbsd32_module.c,v 1.11 2022/05/24 06:20:04 andvar Exp $");

#include <sys/param.h>
#include <sys/dirent.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <sys/kobj.h>

#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_syscall.h>
#include <compat/netbsd32/netbsd32_syscallargs.h>
#include <compat/netbsd32/netbsd32_conv.h>

static int
modctl32_handle_stat(struct netbsd32_iovec *iov, void *arg)
{
       int ms_cnt;
       modstat_t *ms, *mso;
       size_t ms_len;
       char *req, *reqo;
       size_t req_len;
       char *out_p;
       size_t out_s;

       modinfo_t *mi;
       module_t *mod;
       vaddr_t addr;
       size_t size;
       size_t used;
       int off;
       int error;
       bool stataddr;

       /* 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();
       ms_cnt = 0;
       req_len = 1;

       /*
        * Count up the number of modstat_t needed, and total size of
        * require_module lists on both active and built-in lists
        */
       TAILQ_FOREACH(mod, &module_list, mod_chain) {
               ms_cnt++;
               mi = mod->mod_info;
               if (mi->mi_required != NULL) {
                       req_len += strlen(mi->mi_required) + 1;
               }
       }
       TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
               ms_cnt++;
               mi = mod->mod_info;
               if (mi->mi_required != NULL) {
                       req_len += strlen(mi->mi_required) + 1;
               }
       }

       /* Allocate internal buffers to hold all the output data */
       ms_len = ms_cnt * sizeof(modstat_t);
       ms = kmem_zalloc(ms_len, KM_SLEEP);
       req = kmem_zalloc(req_len, KM_SLEEP);

       mso = ms;
       reqo = req++;
       off = 1;

       /*
        * Load data into our internal buffers for both active and
        * built-in module lists
        */
       TAILQ_FOREACH(mod, &module_list, mod_chain) {
               mi = mod->mod_info;
               strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name));
               if (mi->mi_required != NULL) {
                       ms->ms_reqoffset = off;
                       used = strlcpy(req,  mi->mi_required, req_len - off);
                       KASSERTMSG(used < req_len - off, "reqlist grew!");
                       off = used + 1;
                       req += used + 1;
               } else
                       ms->ms_reqoffset = 0;
               if (mod->mod_kobj != NULL && stataddr) {
                       kobj_stat(mod->mod_kobj, &addr, &size);
                       ms->ms_addr = addr;
                       ms->ms_size = size;
               }
               ms->ms_class = mi->mi_class;
               ms->ms_refcnt = mod->mod_refcnt;
               ms->ms_source = mod->mod_source;
               ms->ms_flags = mod->mod_flags;
               ms++;
       }
       TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
               mi = mod->mod_info;
               strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name));
               if (mi->mi_required != NULL) {
                       ms->ms_reqoffset = off;
                       used = strlcpy(req,  mi->mi_required, req_len - off);
                       KASSERTMSG(used < req_len - off, "reqlist grew!");
                       off += used + 1;
                       req += used + 1;
               } else
                       ms->ms_reqoffset = 0;
               if (mod->mod_kobj != NULL && stataddr) {
                       kobj_stat(mod->mod_kobj, &addr, &size);
                       ms->ms_addr = addr;
                       ms->ms_size = size;
               }
               ms->ms_class = mi->mi_class;
               ms->ms_refcnt = -1;
               KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL);
               ms->ms_source = mod->mod_source;
               ms++;
       }
       kernconfig_unlock();

       /*
        * Now copyout our internal buffers back to userland
        */
       out_p = NETBSD32PTR64(iov->iov_base);
       out_s = iov->iov_len;
       size = sizeof(ms_cnt);

       /* Copy out the count of modstat_t */
       if (out_s) {
               size = uimin(sizeof(ms_cnt), out_s);
               error = copyout(&ms_cnt, out_p, size);
               out_p += size;
               out_s -= size;
       }
       /* Copy out the modstat_t array */
       if (out_s && error == 0) {
               size = uimin(ms_len, out_s);
               error = copyout(mso, out_p, size);
               out_p += size;
               out_s -= size;
       }
       /* Copy out the "required" strings */
       if (out_s && error == 0) {
               size = uimin(req_len, out_s);
               error = copyout(reqo, out_p, size);
               out_p += size;
               out_s -= size;
       }
       kmem_free(mso, ms_len);
       kmem_free(reqo, req_len);

       /* Finally, update the userland copy of the iovec's length */
       if (error == 0) {
               iov->iov_len = ms_len + req_len + sizeof(ms_cnt);
               error = copyout(iov, arg, sizeof(*iov));
       }

       return error;
}

int
compat32_80_modctl_compat_stub(struct lwp *lwp,
   const struct netbsd32_modctl_args *uap, register_t *result)
{

       return EPASSTHROUGH;
}

int
netbsd32_modctl(struct lwp *lwp, const struct netbsd32_modctl_args *uap,
       register_t *result)
{
       /* {
               syscallarg(int) cmd;
               syscallarg(netbsd32_voidp) arg;
       } */
       char buf[MAXMODNAME];
       struct netbsd32_iovec iov;
       struct netbsd32_modctl_load ml;
       int error;
       void *arg;
#ifdef MODULAR
       uintptr_t loadtype;
#endif

       arg = SCARG_P32(uap, arg);

       MODULE_HOOK_CALL(compat32_80_modctl_hook, (lwp, uap, result),
           enosys(), error);
       if (error != EPASSTHROUGH && error != ENOSYS)
               return error;

       switch (SCARG(uap, cmd)) {
       case MODCTL_LOAD:
               error = copyin(arg, &ml, sizeof(ml));
               if (error != 0)
                       break;
               error = handle_modctl_load(NETBSD32PTR64(ml.ml_filename),
                    ml.ml_flags, NETBSD32PTR64(ml.ml_props), ml.ml_propslen);
               break;

       case MODCTL_UNLOAD:
               error = copyinstr(arg, buf, sizeof(buf), NULL);
               if (error == 0) {
                       error = module_unload(buf);
               }
               break;

       case MODCTL_STAT:
               error = copyin(arg, &iov, sizeof(iov));
               if (error != 0) {
                       break;
               }
               error = modctl32_handle_stat(&iov, arg);
               break;

       case MODCTL_EXISTS:
#ifndef MODULAR
               error = ENOSYS;
#else
               loadtype = (uintptr_t)arg;
               switch (loadtype) {     /* 0 = modload, 1 = autoload */
               case 0:                 /* FALLTHROUGH */
               case 1:
                       error = kauth_authorize_system(kauth_cred_get(),
                            KAUTH_SYSTEM_MODULE, 0,
                            (void *)(uintptr_t)MODCTL_LOAD,
                            (void *)loadtype, NULL);
                       break;

               default:
                       error = EINVAL;
                       break;
               }
#endif
               break;

       default:
               error = EINVAL;
               break;
       }

       return error;
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.