FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_posix_sem.c

     /*-
      * Copyright (c) 2003-2006 SPARTA, Inc.
      * Copyright (c) 2009 Robert N. M. Watson
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project in part by Network
      * Associates Laboratories, the Security Research Division of Network
      * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
      * as part of the DARPA CHATS research program.
     *
     * This software was enhanced by SPARTA ISSO under SPAWAR contract
     * N66001-04-C-6019 ("SEFOS").
     *
     * This software was developed at the University of Cambridge Computer
     * Laboratory with support from a grant from Google, Inc. 
     *
     * 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 AUTHOR 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 AUTHOR 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>
    __FBSDID("$FreeBSD: releng/11.0/sys/security/mac/mac_posix_sem.c 258541 2013-11-25 07:38:45Z attilio $");
    
    #include "opt_mac.h"
    #include "opt_posix.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/ksem.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/sdt.h>
    #include <sys/systm.h>
    #include <sys/sysctl.h>
    
    #include <security/mac/mac_framework.h>
    #include <security/mac/mac_internal.h>
    #include <security/mac/mac_policy.h>
    
    static struct label *
    mac_posixsem_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_POLICY_PERFORM(posixsem_init_label, label);
            return (label);
    }
    
    void
    mac_posixsem_init(struct ksem *ks)
    {
    
            if (mac_labeled & MPC_OBJECT_POSIXSEM)
                    ks->ks_label = mac_posixsem_label_alloc();
            else
                    ks->ks_label = NULL;
    }
    
    static void
    mac_posixsem_label_free(struct label *label)
    {
    
            MAC_POLICY_PERFORM_NOSLEEP(posixsem_destroy_label, label);
            mac_labelzone_free(label);
    }
    
    void
    mac_posixsem_destroy(struct ksem *ks)
    {
    
            if (ks->ks_label != NULL) {
                    mac_posixsem_label_free(ks->ks_label);
                    ks->ks_label = NULL;
            }
    }
    
    void
    mac_posixsem_create(struct ucred *cred, struct ksem *ks)
    {
    
           MAC_POLICY_PERFORM_NOSLEEP(posixsem_create, cred, ks, ks->ks_label);
   }
   
   MAC_CHECK_PROBE_DEFINE2(posixsem_check_open, "struct ucred *",
       "struct ksem *");
   
   int
   mac_posixsem_check_open(struct ucred *cred, struct ksem *ks)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_open, cred, ks,
               ks->ks_label);
           MAC_CHECK_PROBE2(posixsem_check_open, error, cred, ks);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixsem_check_getvalue, "struct ucred *",
       "struct ucred *", "struct ksem *");
   
   int
   mac_posixsem_check_getvalue(struct ucred *active_cred, struct ucred *file_cred,
       struct ksem *ks)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_getvalue, active_cred,
               file_cred, ks, ks->ks_label);
           MAC_CHECK_PROBE3(posixsem_check_getvalue, error, active_cred,
               file_cred, ks);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixsem_check_post, "struct ucred *",
       "struct ucred *", "struct ksem *");
   
   int
   mac_posixsem_check_post(struct ucred *active_cred, struct ucred *file_cred,
       struct ksem *ks)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_post, active_cred, file_cred,
               ks, ks->ks_label);
           MAC_CHECK_PROBE3(posixsem_check_post, error, active_cred, file_cred,
               ks);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixsem_check_stat, "struct ucred *",
       "struct ucred *", "struct ksem *");
   
   int
   mac_posixsem_check_stat(struct ucred *active_cred, struct ucred *file_cred,
       struct ksem *ks)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_stat, active_cred, file_cred,
               ks, ks->ks_label);
           MAC_CHECK_PROBE3(posixsem_check_stat, error, active_cred, file_cred,
               ks);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(posixsem_check_unlink, "struct ucred *",
       "struct ksem *");
   
   int
   mac_posixsem_check_unlink(struct ucred *cred, struct ksem *ks)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_unlink, cred, ks,
               ks->ks_label);
           MAC_CHECK_PROBE2(posixsem_check_unlink, error, cred, ks);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixsem_check_wait, "struct ucred *",
       "struct ucred *", "struct ksem *");
   
   int
   mac_posixsem_check_wait(struct ucred *active_cred, struct ucred *file_cred,
       struct ksem *ks)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_wait, active_cred, file_cred,
               ks, ks->ks_label);
           MAC_CHECK_PROBE3(posixsem_check_wait, error, active_cred, file_cred,
               ks);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixsem_check_setmode, "struct ucred *",
       "struct ksem *", "mode_t");
   
   int
   mac_posixsem_check_setmode(struct ucred *cred, struct ksem *ks, mode_t mode)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setmode, cred, ks,
               ks->ks_label, mode);
           MAC_CHECK_PROBE3(posixsem_check_setmode, error, cred, ks, mode);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(posixsem_check_setowner, "struct ucred *",
       "struct ks *", "uid_t", "gid_t");
   
   int
   mac_posixsem_check_setowner(struct ucred *cred, struct ksem *ks, uid_t uid,
       gid_t gid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixsem_check_setowner, cred, ks,
               ks->ks_label, uid, gid);
           MAC_CHECK_PROBE4(posixsem_check_setowner, error, cred, ks,
               uid, gid);
   
           return (error);
   }

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