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e28767f0e1
With the mac_priority(4) realtime policy active, users and processes in the realtime group may promote existing threads and processes to realtime scheduling priority. Extend the privileges granted to PRIV_SCHED_SETPOLICY which allows explicit creation of new realtime threads. One use case of this is when the pthread scheduling policy is set to SCHED_RR or SCHED_FIFO via pthread_attr_setschedpolicy(...) before calling pthread_create(...). I ran into this when testing audio software with realtime threads, particularly audio/ardour6. MFC after: 1 week Differential revision: https://reviews.freebsd.org/D33393
84 lines
3.0 KiB
C
84 lines
3.0 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 priority scheduling 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 idletime_enabled = 1;
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SYSCTL_INT(_security_mac_priority, OID_AUTO, idletime, CTLFLAG_RWTUN,
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&idletime_enabled, 0,
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"Enable idle priority scheduling for group idletime_gid");
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static int idletime_gid = GID_ID_PRIO;
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SYSCTL_INT(_security_mac_priority, OID_AUTO, idletime_gid, CTLFLAG_RWTUN,
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&idletime_gid, 0,
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"Group id of the idletime 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 || priv == PRIV_SCHED_SETPOLICY) &&
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realtime_enabled && groupmember(realtime_gid, cred))
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return (0);
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if (priv == PRIV_SCHED_IDPRIO && idletime_enabled &&
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groupmember(idletime_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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