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This is a MAC policy module that grants scheduling privileges based on group membership. Users or processes in the group realtime (gid 47) are allowed to run threads and processes with realtime scheduling priority. For timing-sensitive, low-latency software like audio/jack, running with realtime priority helps to avoid stutter and gaps. PR: 239125 MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D33191
68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Florian Walpen <dev@submerge.ch>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/priv.h>
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#include <sys/sysctl.h>
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#include <sys/ucred.h>
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#include <security/mac/mac_policy.h>
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SYSCTL_DECL(_security_mac);
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static SYSCTL_NODE(_security_mac, OID_AUTO, priority,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"mac_priority policy controls");
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static int realtime_enabled = 1;
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SYSCTL_INT(_security_mac_priority, OID_AUTO, realtime, CTLFLAG_RWTUN,
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&realtime_enabled, 0,
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"Enable realtime policy for group realtime_gid");
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static int realtime_gid = GID_RT_PRIO;
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SYSCTL_INT(_security_mac_priority, OID_AUTO, realtime_gid, CTLFLAG_RWTUN,
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&realtime_gid, 0,
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"Group id of the realtime privilege group");
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static int
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priority_priv_grant(struct ucred *cred, int priv)
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{
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if (priv == PRIV_SCHED_RTPRIO && realtime_enabled &&
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groupmember(realtime_gid, cred))
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return (0);
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return (EPERM);
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}
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static struct mac_policy_ops priority_ops = {
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.mpo_priv_grant = priority_priv_grant,
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};
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MAC_POLICY_SET(&priority_ops, mac_priority, "MAC/priority",
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MPC_LOADTIME_FLAG_UNLOADOK, NULL);
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