The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_posix_sem.c

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    1 /*-
    2  * Copyright (c) 2003-2006 SPARTA, Inc.
    3  * Copyright (c) 2009 Robert N. M. Watson
    4  * All rights reserved.
    5  *
    6  * This software was developed for the FreeBSD Project in part by Network
    7  * Associates Laboratories, the Security Research Division of Network
    8  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
    9  * as part of the DARPA CHATS research program.
   10  *
   11  * This software was enhanced by SPARTA ISSO under SPAWAR contract
   12  * N66001-04-C-6019 ("SEFOS").
   13  *
   14  * This software was developed at the University of Cambridge Computer
   15  * Laboratory with support from a grant from Google, Inc. 
   16  *
   17  * Redistribution and use in source and binary forms, with or without
   18  * modification, are permitted provided that the following conditions
   19  * are met:
   20  * 1. Redistributions of source code must retain the above copyright
   21  *    notice, this list of conditions and the following disclaimer.
   22  * 2. Redistributions in binary form must reproduce the above copyright
   23  *    notice, this list of conditions and the following disclaimer in the
   24  *    documentation and/or other materials provided with the distribution.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: releng/9.0/sys/security/mac/mac_posix_sem.c 224914 2011-08-16 20:07:47Z kib $");
   41 
   42 #include "opt_kdtrace.h"
   43 #include "opt_mac.h"
   44 #include "opt_posix.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/kernel.h>
   48 #include <sys/ksem.h>
   49 #include <sys/malloc.h>
   50 #include <sys/module.h>
   51 #include <sys/sdt.h>
   52 #include <sys/systm.h>
   53 #include <sys/sysctl.h>
   54 
   55 #include <security/mac/mac_framework.h>
   56 #include <security/mac/mac_internal.h>
   57 #include <security/mac/mac_policy.h>
   58 
   59 static struct label *
   60 mac_posixsem_label_alloc(void)
   61 {
   62         struct label *label;
   63 
   64         label = mac_labelzone_alloc(M_WAITOK);
   65         MAC_POLICY_PERFORM(posixsem_init_label, label);
   66         return (label);
   67 }
   68 
   69 void
   70 mac_posixsem_init(struct ksem *ks)
   71 {
   72 
   73         if (mac_labeled & MPC_OBJECT_POSIXSEM)
   74                 ks->ks_label = mac_posixsem_label_alloc();
   75         else
   76                 ks->ks_label = NULL;
   77 }
   78 
   79 static void
   80 mac_posixsem_label_free(struct label *label)
   81 {
   82 
   83         MAC_POLICY_PERFORM_NOSLEEP(posixsem_destroy_label, label);
   84         mac_labelzone_free(label);
   85 }
   86 
   87 void
   88 mac_posixsem_destroy(struct ksem *ks)
   89 {
   90 
   91         if (ks->ks_label != NULL) {
   92                 mac_posixsem_label_free(ks->ks_label);
   93                 ks->ks_label = NULL;
   94         }
   95 }
   96 
   97 void
   98 mac_posixsem_create(struct ucred *cred, struct ksem *ks)
   99 {
  100 
  101         MAC_POLICY_PERFORM_NOSLEEP(posixsem_create, cred, ks, ks->ks_label);
  102 }
  103 
  104 MAC_CHECK_PROBE_DEFINE2(posixsem_check_open, "struct ucred *",
  105     "struct ksem *");
  106 
  107 int
  108 mac_posixsem_check_open(struct ucred *cred, struct ksem *ks)
  109 {
  110         int error;
  111 
  112         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_open, cred, ks,
  113             ks->ks_label);
  114         MAC_CHECK_PROBE2(posixsem_check_open, error, cred, ks);
  115 
  116         return (error);
  117 }
  118 
  119 MAC_CHECK_PROBE_DEFINE3(posixsem_check_getvalue, "struct ucred *",
  120     "struct ucred *", "struct ksem *");
  121 
  122 int
  123 mac_posixsem_check_getvalue(struct ucred *active_cred, struct ucred *file_cred,
  124     struct ksem *ks)
  125 {
  126         int error;
  127 
  128         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_getvalue, active_cred,
  129             file_cred, ks, ks->ks_label);
  130         MAC_CHECK_PROBE3(posixsem_check_getvalue, error, active_cred,
  131             file_cred, ks);
  132 
  133         return (error);
  134 }
  135 
  136 MAC_CHECK_PROBE_DEFINE3(posixsem_check_post, "struct ucred *",
  137     "struct ucred *", "struct ksem *");
  138 
  139 int
  140 mac_posixsem_check_post(struct ucred *active_cred, struct ucred *file_cred,
  141     struct ksem *ks)
  142 {
  143         int error;
  144 
  145         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_post, active_cred, file_cred,
  146             ks, ks->ks_label);
  147         MAC_CHECK_PROBE3(posixsem_check_post, error, active_cred, file_cred,
  148             ks);
  149 
  150         return (error);
  151 }
  152 
  153 MAC_CHECK_PROBE_DEFINE3(posixsem_check_stat, "struct ucred *",
  154     "struct ucred *", "struct ksem *");
  155 
  156 int
  157 mac_posixsem_check_stat(struct ucred *active_cred, struct ucred *file_cred,
  158     struct ksem *ks)
  159 {
  160         int error;
  161 
  162         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_stat, active_cred, file_cred,
  163             ks, ks->ks_label);
  164         MAC_CHECK_PROBE3(posixsem_check_stat, error, active_cred, file_cred,
  165             ks);
  166 
  167         return (error);
  168 }
  169 
  170 MAC_CHECK_PROBE_DEFINE2(posixsem_check_unlink, "struct ucred *",
  171     "struct ksem *");
  172 
  173 int
  174 mac_posixsem_check_unlink(struct ucred *cred, struct ksem *ks)
  175 {
  176         int error;
  177 
  178         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_unlink, cred, ks,
  179             ks->ks_label);
  180         MAC_CHECK_PROBE2(posixsem_check_unlink, error, cred, ks);
  181 
  182         return (error);
  183 }
  184 
  185 MAC_CHECK_PROBE_DEFINE3(posixsem_check_wait, "struct ucred *",
  186     "struct ucred *", "struct ksem *");
  187 
  188 int
  189 mac_posixsem_check_wait(struct ucred *active_cred, struct ucred *file_cred,
  190     struct ksem *ks)
  191 {
  192         int error;
  193 
  194         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_wait, active_cred, file_cred,
  195             ks, ks->ks_label);
  196         MAC_CHECK_PROBE3(posixsem_check_wait, error, active_cred, file_cred,
  197             ks);
  198 
  199         return (error);
  200 }
  201 
  202 MAC_CHECK_PROBE_DEFINE3(posixsem_check_setmode, "struct ucred *",
  203     "struct ksem *", "mode_t");
  204 
  205 int
  206 mac_posixsem_check_setmode(struct ucred *cred, struct ksem *ks, mode_t mode)
  207 {
  208         int error;
  209 
  210         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setmode, cred, ks,
  211             ks->ks_label, mode);
  212         MAC_CHECK_PROBE3(posixsem_check_setmode, error, cred, ks, mode);
  213 
  214         return (error);
  215 }
  216 
  217 MAC_CHECK_PROBE_DEFINE4(posixsem_check_setowner, "struct ucred *",
  218     "struct ks *", "uid_t", "gid_t");
  219 
  220 int
  221 mac_posixsem_check_setowner(struct ucred *cred, struct ksem *ks, uid_t uid,
  222     gid_t gid)
  223 {
  224         int error;
  225 
  226         MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setowner, cred, ks,
  227             ks->ks_label, uid, gid);
  228         MAC_CHECK_PROBE4(posixsem_check_setowner, error, cred, ks,
  229             uid, gid);
  230 
  231         return (error);
  232 }

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