FreeBSD/Linux Kernel Cross Reference
sys/security/mac_priority/mac_priority.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause
      *
      * Copyright (c) 2021 Florian Walpen <dev@submerge.ch>
      *
      * 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/param.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/priv.h>
    #include <sys/sysctl.h>
    #include <sys/ucred.h>
    
    #include <security/mac/mac_policy.h>
    
    SYSCTL_DECL(_security_mac);
    
    static SYSCTL_NODE(_security_mac, OID_AUTO, priority,
        CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
        "mac_priority policy controls");
    
    static int realtime_enabled = 1;
    SYSCTL_INT(_security_mac_priority, OID_AUTO, realtime, CTLFLAG_RWTUN,
        &realtime_enabled, 0,
        "Enable realtime priority scheduling for group realtime_gid");
    
    static int realtime_gid = GID_RT_PRIO;
    SYSCTL_INT(_security_mac_priority, OID_AUTO, realtime_gid, CTLFLAG_RWTUN,
        &realtime_gid, 0,
        "Group id of the realtime privilege group");
    
    static int idletime_enabled = 1;
    SYSCTL_INT(_security_mac_priority, OID_AUTO, idletime, CTLFLAG_RWTUN,
        &idletime_enabled, 0,
        "Enable idle priority scheduling for group idletime_gid");
    
    static int idletime_gid = GID_ID_PRIO;
    SYSCTL_INT(_security_mac_priority, OID_AUTO, idletime_gid, CTLFLAG_RWTUN,
        &idletime_gid, 0,
        "Group id of the idletime privilege group");
    
    static int
    priority_priv_grant(struct ucred *cred, int priv)
    {
            if ((priv == PRIV_SCHED_RTPRIO || priv == PRIV_SCHED_SETPOLICY) &&
                realtime_enabled && groupmember(realtime_gid, cred))
                    return (0);
    
            if (priv == PRIV_SCHED_IDPRIO && idletime_enabled &&
                groupmember(idletime_gid, cred))
                    return (0);
    
            return (EPERM);
    }
    
    static struct mac_policy_ops priority_ops = {
            .mpo_priv_grant = priority_priv_grant,
    };
    
    MAC_POLICY_SET(&priority_ops, mac_priority, "MAC/priority",
        MPC_LOADTIME_FLAG_UNLOADOK, NULL);

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