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

     /*-
      * Copyright (c) 2003-2006 SPARTA, Inc.
      * Copyright (c) 2009-2011 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_shm.c 258541 2013-11-25 07:38:45Z attilio $");
    
    #include "opt_mac.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/mman.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_posixshm_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_POLICY_PERFORM(posixshm_init_label, label);
            return (label);
    }
    
    void
    mac_posixshm_init(struct shmfd *shmfd)
    {
    
            if (mac_labeled & MPC_OBJECT_POSIXSHM)
                    shmfd->shm_label = mac_posixshm_label_alloc();
            else
                    shmfd->shm_label = NULL;
    }
    
    static void
    mac_posixshm_label_free(struct label *label)
    {
    
            MAC_POLICY_PERFORM_NOSLEEP(posixshm_destroy_label, label);
            mac_labelzone_free(label);
    }
    
    void
    mac_posixshm_destroy(struct shmfd *shmfd)
    {
    
            if (shmfd->shm_label != NULL) {
                    mac_posixshm_label_free(shmfd->shm_label);
                    shmfd->shm_label = NULL;
            }
    }
    
    void
    mac_posixshm_create(struct ucred *cred, struct shmfd *shmfd)
    {
    
            MAC_POLICY_PERFORM_NOSLEEP(posixshm_create, cred, shmfd,
               shmfd->shm_label);
   }
   
   MAC_CHECK_PROBE_DEFINE2(posixshm_check_create, "struct ucred *",
       "const char *");
   
   int
   mac_posixshm_check_create(struct ucred *cred, const char *path)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_create, cred, path);
           MAC_CHECK_PROBE2(posixshm_check_create, error, cred, path);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(posixshm_check_mmap, "struct ucred *",
       "struct shmfd *", "int", "int");
   
   int
   mac_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd, int prot,
       int flags)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_mmap, cred, shmfd,
               shmfd->shm_label, prot, flags);
           MAC_CHECK_PROBE4(posixshm_check_mmap, error, cred, shmfd, prot,
               flags);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixshm_check_open, "struct ucred *",
       "struct shmfd *", "accmode_t");
   
   int
   mac_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
       accmode_t accmode)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_open, cred, shmfd,
               shmfd->shm_label, accmode);
           MAC_CHECK_PROBE3(posixshm_check_open, error, cred, shmfd, accmode);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixshm_check_stat, "struct ucred *",
       "struct ucred *", "struct shmfd *");
   
   int
   mac_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
       struct shmfd *shmfd)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_stat, active_cred, file_cred,
               shmfd, shmfd->shm_label);
           MAC_CHECK_PROBE3(posixshm_check_stat, error, active_cred, file_cred,
               shmfd);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixshm_check_truncate, "struct ucred *",
       "struct ucred *", "struct shmfd *");
   
   int
   mac_posixshm_check_truncate(struct ucred *active_cred, struct ucred *file_cred,
       struct shmfd *shmfd)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_truncate, active_cred,
               file_cred, shmfd, shmfd->shm_label);
           MAC_CHECK_PROBE3(posixshm_check_truncate, error, active_cred,
               file_cred, shmfd);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(posixshm_check_unlink, "struct ucred *",
       "struct shmfd *");
   
   int
   mac_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_unlink, cred, shmfd,
               shmfd->shm_label);
           MAC_CHECK_PROBE2(posixshm_check_unlink, error, cred, shmfd);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixshm_check_setmode, "struct ucred *",
       "struct shmfd *", "mode_t");
   
   int
   mac_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd, mode_t mode)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setmode, cred, shmfd,
               shmfd->shm_label, mode);
           MAC_CHECK_PROBE3(posixshm_check_setmode, error, cred, shmfd, mode);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(posixshm_check_setowner, "struct ucred *",
       "struct shmfd *", "uid_t", "gid_t");
   
   int
   mac_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd, uid_t uid,
       gid_t gid)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_setowner, cred, shmfd,
               shmfd->shm_label, uid, gid);
           MAC_CHECK_PROBE4(posixshm_check_setowner, error, cred, shmfd,
               uid, gid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixshm_check_read, "struct ucred *",
       "struct ucred *", "struct shmfd *");
   
   int
   mac_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
       struct shmfd *shmfd)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_read, active_cred,
               file_cred, shmfd, shmfd->shm_label);
           MAC_CHECK_PROBE3(posixshm_check_read, error, active_cred,
               file_cred, shmfd);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(posixshm_check_write, "struct ucred *",
       "struct ucred *", "struct shmfd *");
   
   int
   mac_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
       struct shmfd *shmfd)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(posixshm_check_write, active_cred,
               file_cred, shmfd, shmfd->shm_label);
           MAC_CHECK_PROBE3(posixshm_check_write, error, active_cred,
               file_cred, shmfd);
   
           return (error);
   }

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