ea7e7006db
Based on the description in Linux man page. Reviewed by: markj, ngie (previous version) Sponsored by: Mellanox Technologies MFC after: 1 week Differential revision: https://reviews.freebsd.org/D18837
1698 lines
44 KiB
C
1698 lines
44 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause AND BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1994 Adam Glass and Charles Hannum. All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Adam Glass and Charles
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* Hannum.
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* 4. The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: sysv_shm.c,v 1.39 1997/10/07 10:02:03 drochner Exp $
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*/
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/*-
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* Copyright (c) 2003-2005 McAfee, Inc.
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* Copyright (c) 2016-2017 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project in part by McAfee
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* Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
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* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
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* program.
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*
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* Portions of this software were developed by BAE Systems, the University of
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* Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
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* contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
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* Computing (TC) research program.
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_sysvipc.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/sysctl.h>
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#include <sys/shm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/racct.h>
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#include <sys/resourcevar.h>
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#include <sys/rwlock.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/jail.h>
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_object.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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FEATURE(sysv_shm, "System V shared memory segments support");
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static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
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static int shmget_allocate_segment(struct thread *td,
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struct shmget_args *uap, int mode);
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static int shmget_existing(struct thread *td, struct shmget_args *uap,
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int mode, int segnum);
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#define SHMSEG_FREE 0x0200
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#define SHMSEG_REMOVED 0x0400
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#define SHMSEG_ALLOCATED 0x0800
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static int shm_last_free, shm_nused, shmalloced;
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vm_size_t shm_committed;
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static struct shmid_kernel *shmsegs;
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static unsigned shm_prison_slot;
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struct shmmap_state {
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vm_offset_t va;
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int shmid;
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};
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static void shm_deallocate_segment(struct shmid_kernel *);
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static int shm_find_segment_by_key(struct prison *, key_t);
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static struct shmid_kernel *shm_find_segment(struct prison *, int, bool);
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static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
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static void shmrealloc(void);
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static int shminit(void);
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static int sysvshm_modload(struct module *, int, void *);
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static int shmunload(void);
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static void shmexit_myhook(struct vmspace *vm);
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static void shmfork_myhook(struct proc *p1, struct proc *p2);
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static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
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static void shm_remove(struct shmid_kernel *, int);
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static struct prison *shm_find_prison(struct ucred *);
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static int shm_prison_cansee(struct prison *, struct shmid_kernel *);
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static int shm_prison_check(void *, void *);
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static int shm_prison_set(void *, void *);
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static int shm_prison_get(void *, void *);
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static int shm_prison_remove(void *, void *);
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static void shm_prison_cleanup(struct prison *);
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/*
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* Tuneable values.
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*/
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#ifndef SHMMAXPGS
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#define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */
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#endif
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#ifndef SHMMAX
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#define SHMMAX (SHMMAXPGS*PAGE_SIZE)
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#endif
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#ifndef SHMMIN
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#define SHMMIN 1
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#endif
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#ifndef SHMMNI
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#define SHMMNI 192
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#endif
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#ifndef SHMSEG
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#define SHMSEG 128
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#endif
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#ifndef SHMALL
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#define SHMALL (SHMMAXPGS)
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#endif
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struct shminfo shminfo = {
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.shmmax = SHMMAX,
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.shmmin = SHMMIN,
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.shmmni = SHMMNI,
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.shmseg = SHMSEG,
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.shmall = SHMALL
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};
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static int shm_use_phys;
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static int shm_allow_removed = 1;
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SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RWTUN, &shminfo.shmmax, 0,
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"Maximum shared memory segment size");
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SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RWTUN, &shminfo.shmmin, 0,
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"Minimum shared memory segment size");
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SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
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"Number of shared memory identifiers");
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SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
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"Number of segments per process");
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SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RWTUN, &shminfo.shmall, 0,
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"Maximum number of pages available for shared memory");
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SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RWTUN,
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&shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
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SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RWTUN,
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&shm_allow_removed, 0,
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"Enable/Disable attachment to attached segments marked for removal");
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SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD |
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CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "",
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"Array of struct shmid_kernel for each potential shared memory segment");
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static struct sx sysvshmsx;
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#define SYSVSHM_LOCK() sx_xlock(&sysvshmsx)
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#define SYSVSHM_UNLOCK() sx_xunlock(&sysvshmsx)
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#define SYSVSHM_ASSERT_LOCKED() sx_assert(&sysvshmsx, SA_XLOCKED)
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static int
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shm_find_segment_by_key(struct prison *pr, key_t key)
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{
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int i;
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for (i = 0; i < shmalloced; i++)
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if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
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shmsegs[i].cred != NULL &&
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shmsegs[i].cred->cr_prison == pr &&
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shmsegs[i].u.shm_perm.key == key)
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return (i);
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return (-1);
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}
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/*
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* Finds segment either by shmid if is_shmid is true, or by segnum if
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* is_shmid is false.
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*/
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static struct shmid_kernel *
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shm_find_segment(struct prison *rpr, int arg, bool is_shmid)
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{
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struct shmid_kernel *shmseg;
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int segnum;
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segnum = is_shmid ? IPCID_TO_IX(arg) : arg;
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if (segnum < 0 || segnum >= shmalloced)
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return (NULL);
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shmseg = &shmsegs[segnum];
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if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
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(!shm_allow_removed &&
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(shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
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(is_shmid && shmseg->u.shm_perm.seq != IPCID_TO_SEQ(arg)) ||
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shm_prison_cansee(rpr, shmseg) != 0)
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return (NULL);
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return (shmseg);
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}
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static void
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shm_deallocate_segment(struct shmid_kernel *shmseg)
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{
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vm_size_t size;
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SYSVSHM_ASSERT_LOCKED();
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vm_object_deallocate(shmseg->object);
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shmseg->object = NULL;
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size = round_page(shmseg->u.shm_segsz);
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shm_committed -= btoc(size);
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shm_nused--;
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shmseg->u.shm_perm.mode = SHMSEG_FREE;
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#ifdef MAC
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mac_sysvshm_cleanup(shmseg);
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#endif
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racct_sub_cred(shmseg->cred, RACCT_NSHM, 1);
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racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size);
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crfree(shmseg->cred);
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shmseg->cred = NULL;
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}
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static int
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shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
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{
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struct shmid_kernel *shmseg;
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int segnum, result;
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vm_size_t size;
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SYSVSHM_ASSERT_LOCKED();
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segnum = IPCID_TO_IX(shmmap_s->shmid);
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KASSERT(segnum >= 0 && segnum < shmalloced,
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("segnum %d shmalloced %d", segnum, shmalloced));
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shmseg = &shmsegs[segnum];
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size = round_page(shmseg->u.shm_segsz);
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result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size);
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if (result != KERN_SUCCESS)
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return (EINVAL);
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shmmap_s->shmid = -1;
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shmseg->u.shm_dtime = time_second;
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if (--shmseg->u.shm_nattch == 0 &&
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(shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
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shm_deallocate_segment(shmseg);
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shm_last_free = segnum;
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}
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return (0);
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}
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static void
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shm_remove(struct shmid_kernel *shmseg, int segnum)
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{
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shmseg->u.shm_perm.key = IPC_PRIVATE;
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shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
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if (shmseg->u.shm_nattch == 0) {
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shm_deallocate_segment(shmseg);
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shm_last_free = segnum;
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}
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}
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static struct prison *
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shm_find_prison(struct ucred *cred)
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{
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struct prison *pr, *rpr;
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pr = cred->cr_prison;
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prison_lock(pr);
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rpr = osd_jail_get(pr, shm_prison_slot);
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prison_unlock(pr);
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return rpr;
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}
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static int
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shm_prison_cansee(struct prison *rpr, struct shmid_kernel *shmseg)
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{
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if (shmseg->cred == NULL ||
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!(rpr == shmseg->cred->cr_prison ||
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prison_ischild(rpr, shmseg->cred->cr_prison)))
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return (EINVAL);
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return (0);
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}
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static int
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kern_shmdt_locked(struct thread *td, const void *shmaddr)
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{
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struct proc *p = td->td_proc;
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struct shmmap_state *shmmap_s;
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#ifdef MAC
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int error;
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#endif
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int i;
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SYSVSHM_ASSERT_LOCKED();
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if (shm_find_prison(td->td_ucred) == NULL)
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return (ENOSYS);
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shmmap_s = p->p_vmspace->vm_shm;
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if (shmmap_s == NULL)
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return (EINVAL);
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AUDIT_ARG_SVIPC_ID(shmmap_s->shmid);
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for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
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if (shmmap_s->shmid != -1 &&
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shmmap_s->va == (vm_offset_t)shmaddr) {
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break;
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}
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}
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if (i == shminfo.shmseg)
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return (EINVAL);
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#ifdef MAC
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error = mac_sysvshm_check_shmdt(td->td_ucred,
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&shmsegs[IPCID_TO_IX(shmmap_s->shmid)]);
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if (error != 0)
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return (error);
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#endif
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return (shm_delete_mapping(p->p_vmspace, shmmap_s));
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}
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#ifndef _SYS_SYSPROTO_H_
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struct shmdt_args {
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const void *shmaddr;
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};
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#endif
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int
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sys_shmdt(struct thread *td, struct shmdt_args *uap)
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{
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int error;
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SYSVSHM_LOCK();
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error = kern_shmdt_locked(td, uap->shmaddr);
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SYSVSHM_UNLOCK();
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return (error);
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}
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|
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static int
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kern_shmat_locked(struct thread *td, int shmid, const void *shmaddr,
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int shmflg)
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{
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struct prison *rpr;
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struct proc *p = td->td_proc;
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struct shmid_kernel *shmseg;
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struct shmmap_state *shmmap_s;
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vm_offset_t attach_va;
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vm_prot_t prot;
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vm_size_t size;
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int cow, error, find_space, i, rv;
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AUDIT_ARG_SVIPC_ID(shmid);
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AUDIT_ARG_VALUE(shmflg);
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SYSVSHM_ASSERT_LOCKED();
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rpr = shm_find_prison(td->td_ucred);
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if (rpr == NULL)
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return (ENOSYS);
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shmmap_s = p->p_vmspace->vm_shm;
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if (shmmap_s == NULL) {
|
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shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
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M_SHM, M_WAITOK);
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for (i = 0; i < shminfo.shmseg; i++)
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shmmap_s[i].shmid = -1;
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KASSERT(p->p_vmspace->vm_shm == NULL, ("raced"));
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p->p_vmspace->vm_shm = shmmap_s;
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}
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shmseg = shm_find_segment(rpr, shmid, true);
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if (shmseg == NULL)
|
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return (EINVAL);
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error = ipcperm(td, &shmseg->u.shm_perm,
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(shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
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if (error != 0)
|
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return (error);
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#ifdef MAC
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error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
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if (error != 0)
|
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return (error);
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#endif
|
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for (i = 0; i < shminfo.shmseg; i++) {
|
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if (shmmap_s->shmid == -1)
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break;
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shmmap_s++;
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}
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if (i >= shminfo.shmseg)
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return (EMFILE);
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size = round_page(shmseg->u.shm_segsz);
|
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prot = VM_PROT_READ;
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cow = MAP_INHERIT_SHARE | MAP_PREFAULT_PARTIAL;
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if ((shmflg & SHM_RDONLY) == 0)
|
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prot |= VM_PROT_WRITE;
|
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if (shmaddr != NULL) {
|
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if ((shmflg & SHM_RND) != 0)
|
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attach_va = rounddown2((vm_offset_t)shmaddr, SHMLBA);
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else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0)
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attach_va = (vm_offset_t)shmaddr;
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else
|
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return (EINVAL);
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if ((shmflg & SHM_REMAP) != 0)
|
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cow |= MAP_REMAP;
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find_space = VMFS_NO_SPACE;
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} else {
|
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/*
|
|
* This is just a hint to vm_map_find() about where to
|
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* put it.
|
|
*/
|
|
attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
|
|
lim_max(td, RLIMIT_DATA));
|
|
find_space = VMFS_OPTIMAL_SPACE;
|
|
}
|
|
|
|
vm_object_reference(shmseg->object);
|
|
rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 0, &attach_va,
|
|
size, 0, find_space, prot, prot, cow);
|
|
if (rv != KERN_SUCCESS) {
|
|
vm_object_deallocate(shmseg->object);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
shmmap_s->va = attach_va;
|
|
shmmap_s->shmid = shmid;
|
|
shmseg->u.shm_lpid = p->p_pid;
|
|
shmseg->u.shm_atime = time_second;
|
|
shmseg->u.shm_nattch++;
|
|
td->td_retval[0] = attach_va;
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_shmat(struct thread *td, int shmid, const void *shmaddr, int shmflg)
|
|
{
|
|
int error;
|
|
|
|
SYSVSHM_LOCK();
|
|
error = kern_shmat_locked(td, shmid, shmaddr, shmflg);
|
|
SYSVSHM_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct shmat_args {
|
|
int shmid;
|
|
const void *shmaddr;
|
|
int shmflg;
|
|
};
|
|
#endif
|
|
int
|
|
sys_shmat(struct thread *td, struct shmat_args *uap)
|
|
{
|
|
|
|
return (kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg));
|
|
}
|
|
|
|
static int
|
|
kern_shmctl_locked(struct thread *td, int shmid, int cmd, void *buf,
|
|
size_t *bufsz)
|
|
{
|
|
struct prison *rpr;
|
|
struct shmid_kernel *shmseg;
|
|
struct shmid_ds *shmidp;
|
|
struct shm_info shm_info;
|
|
int error;
|
|
|
|
SYSVSHM_ASSERT_LOCKED();
|
|
|
|
rpr = shm_find_prison(td->td_ucred);
|
|
if (rpr == NULL)
|
|
return (ENOSYS);
|
|
|
|
AUDIT_ARG_SVIPC_ID(shmid);
|
|
AUDIT_ARG_SVIPC_CMD(cmd);
|
|
|
|
switch (cmd) {
|
|
/*
|
|
* It is possible that kern_shmctl is being called from the Linux ABI
|
|
* layer, in which case, we will need to implement IPC_INFO. It should
|
|
* be noted that other shmctl calls will be funneled through here for
|
|
* Linix binaries as well.
|
|
*
|
|
* NB: The Linux ABI layer will convert this data to structure(s) more
|
|
* consistent with the Linux ABI.
|
|
*/
|
|
case IPC_INFO:
|
|
memcpy(buf, &shminfo, sizeof(shminfo));
|
|
if (bufsz)
|
|
*bufsz = sizeof(shminfo);
|
|
td->td_retval[0] = shmalloced;
|
|
return (0);
|
|
case SHM_INFO: {
|
|
shm_info.used_ids = shm_nused;
|
|
shm_info.shm_rss = 0; /*XXX where to get from ? */
|
|
shm_info.shm_tot = 0; /*XXX where to get from ? */
|
|
shm_info.shm_swp = 0; /*XXX where to get from ? */
|
|
shm_info.swap_attempts = 0; /*XXX where to get from ? */
|
|
shm_info.swap_successes = 0; /*XXX where to get from ? */
|
|
memcpy(buf, &shm_info, sizeof(shm_info));
|
|
if (bufsz != NULL)
|
|
*bufsz = sizeof(shm_info);
|
|
td->td_retval[0] = shmalloced;
|
|
return (0);
|
|
}
|
|
}
|
|
shmseg = shm_find_segment(rpr, shmid, cmd != SHM_STAT);
|
|
if (shmseg == NULL)
|
|
return (EINVAL);
|
|
#ifdef MAC
|
|
error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
|
|
if (error != 0)
|
|
return (error);
|
|
#endif
|
|
switch (cmd) {
|
|
case SHM_STAT:
|
|
case IPC_STAT:
|
|
shmidp = (struct shmid_ds *)buf;
|
|
error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
|
|
if (error != 0)
|
|
return (error);
|
|
memcpy(shmidp, &shmseg->u, sizeof(struct shmid_ds));
|
|
if (td->td_ucred->cr_prison != shmseg->cred->cr_prison)
|
|
shmidp->shm_perm.key = IPC_PRIVATE;
|
|
if (bufsz != NULL)
|
|
*bufsz = sizeof(struct shmid_ds);
|
|
if (cmd == SHM_STAT) {
|
|
td->td_retval[0] = IXSEQ_TO_IPCID(shmid,
|
|
shmseg->u.shm_perm);
|
|
}
|
|
break;
|
|
case IPC_SET:
|
|
shmidp = (struct shmid_ds *)buf;
|
|
AUDIT_ARG_SVIPC_PERM(&shmidp->shm_perm);
|
|
error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
|
|
if (error != 0)
|
|
return (error);
|
|
shmseg->u.shm_perm.uid = shmidp->shm_perm.uid;
|
|
shmseg->u.shm_perm.gid = shmidp->shm_perm.gid;
|
|
shmseg->u.shm_perm.mode =
|
|
(shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
|
|
(shmidp->shm_perm.mode & ACCESSPERMS);
|
|
shmseg->u.shm_ctime = time_second;
|
|
break;
|
|
case IPC_RMID:
|
|
error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
|
|
if (error != 0)
|
|
return (error);
|
|
shm_remove(shmseg, IPCID_TO_IX(shmid));
|
|
break;
|
|
#if 0
|
|
case SHM_LOCK:
|
|
case SHM_UNLOCK:
|
|
#endif
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_shmctl(struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz)
|
|
{
|
|
int error;
|
|
|
|
SYSVSHM_LOCK();
|
|
error = kern_shmctl_locked(td, shmid, cmd, buf, bufsz);
|
|
SYSVSHM_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct shmctl_args {
|
|
int shmid;
|
|
int cmd;
|
|
struct shmid_ds *buf;
|
|
};
|
|
#endif
|
|
int
|
|
sys_shmctl(struct thread *td, struct shmctl_args *uap)
|
|
{
|
|
int error;
|
|
struct shmid_ds buf;
|
|
size_t bufsz;
|
|
|
|
/*
|
|
* The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
|
|
* Linux binaries. If we see the call come through the FreeBSD ABI,
|
|
* return an error back to the user since we do not to support this.
|
|
*/
|
|
if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
|
|
uap->cmd == SHM_STAT)
|
|
return (EINVAL);
|
|
|
|
/* IPC_SET needs to copyin the buffer before calling kern_shmctl */
|
|
if (uap->cmd == IPC_SET) {
|
|
if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds))))
|
|
goto done;
|
|
}
|
|
|
|
error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
|
|
if (error)
|
|
goto done;
|
|
|
|
/* Cases in which we need to copyout */
|
|
switch (uap->cmd) {
|
|
case IPC_STAT:
|
|
error = copyout(&buf, uap->buf, bufsz);
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (error) {
|
|
/* Invalidate the return value */
|
|
td->td_retval[0] = -1;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
|
|
static int
|
|
shmget_existing(struct thread *td, struct shmget_args *uap, int mode,
|
|
int segnum)
|
|
{
|
|
struct shmid_kernel *shmseg;
|
|
#ifdef MAC
|
|
int error;
|
|
#endif
|
|
|
|
SYSVSHM_ASSERT_LOCKED();
|
|
KASSERT(segnum >= 0 && segnum < shmalloced,
|
|
("segnum %d shmalloced %d", segnum, shmalloced));
|
|
shmseg = &shmsegs[segnum];
|
|
if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
|
|
return (EEXIST);
|
|
#ifdef MAC
|
|
error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg);
|
|
if (error != 0)
|
|
return (error);
|
|
#endif
|
|
if (uap->size != 0 && uap->size > shmseg->u.shm_segsz)
|
|
return (EINVAL);
|
|
td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
shmget_allocate_segment(struct thread *td, struct shmget_args *uap, int mode)
|
|
{
|
|
struct ucred *cred = td->td_ucred;
|
|
struct shmid_kernel *shmseg;
|
|
vm_object_t shm_object;
|
|
int i, segnum;
|
|
size_t size;
|
|
|
|
SYSVSHM_ASSERT_LOCKED();
|
|
|
|
if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
|
|
return (EINVAL);
|
|
if (shm_nused >= shminfo.shmmni) /* Any shmids left? */
|
|
return (ENOSPC);
|
|
size = round_page(uap->size);
|
|
if (shm_committed + btoc(size) > shminfo.shmall)
|
|
return (ENOMEM);
|
|
if (shm_last_free < 0) {
|
|
shmrealloc(); /* Maybe expand the shmsegs[] array. */
|
|
for (i = 0; i < shmalloced; i++)
|
|
if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
|
|
break;
|
|
if (i == shmalloced)
|
|
return (ENOSPC);
|
|
segnum = i;
|
|
} else {
|
|
segnum = shm_last_free;
|
|
shm_last_free = -1;
|
|
}
|
|
KASSERT(segnum >= 0 && segnum < shmalloced,
|
|
("segnum %d shmalloced %d", segnum, shmalloced));
|
|
shmseg = &shmsegs[segnum];
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
if (racct_add(td->td_proc, RACCT_NSHM, 1)) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (ENOSPC);
|
|
}
|
|
if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) {
|
|
racct_sub(td->td_proc, RACCT_NSHM, 1);
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (ENOMEM);
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* We make sure that we have allocated a pager before we need
|
|
* to.
|
|
*/
|
|
shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP,
|
|
0, size, VM_PROT_DEFAULT, 0, cred);
|
|
if (shm_object == NULL) {
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
racct_sub(td->td_proc, RACCT_NSHM, 1);
|
|
racct_sub(td->td_proc, RACCT_SHMSIZE, size);
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
return (ENOMEM);
|
|
}
|
|
shm_object->pg_color = 0;
|
|
VM_OBJECT_WLOCK(shm_object);
|
|
vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
|
|
vm_object_set_flag(shm_object, OBJ_COLORED | OBJ_NOSPLIT);
|
|
VM_OBJECT_WUNLOCK(shm_object);
|
|
|
|
shmseg->object = shm_object;
|
|
shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid;
|
|
shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid;
|
|
shmseg->u.shm_perm.mode = (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
|
|
shmseg->u.shm_perm.key = uap->key;
|
|
shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
|
|
shmseg->cred = crhold(cred);
|
|
shmseg->u.shm_segsz = uap->size;
|
|
shmseg->u.shm_cpid = td->td_proc->p_pid;
|
|
shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
|
|
shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
|
|
#ifdef MAC
|
|
mac_sysvshm_create(cred, shmseg);
|
|
#endif
|
|
shmseg->u.shm_ctime = time_second;
|
|
shm_committed += btoc(size);
|
|
shm_nused++;
|
|
td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct shmget_args {
|
|
key_t key;
|
|
size_t size;
|
|
int shmflg;
|
|
};
|
|
#endif
|
|
int
|
|
sys_shmget(struct thread *td, struct shmget_args *uap)
|
|
{
|
|
int segnum, mode;
|
|
int error;
|
|
|
|
if (shm_find_prison(td->td_ucred) == NULL)
|
|
return (ENOSYS);
|
|
mode = uap->shmflg & ACCESSPERMS;
|
|
SYSVSHM_LOCK();
|
|
if (uap->key == IPC_PRIVATE) {
|
|
error = shmget_allocate_segment(td, uap, mode);
|
|
} else {
|
|
segnum = shm_find_segment_by_key(td->td_ucred->cr_prison,
|
|
uap->key);
|
|
if (segnum >= 0)
|
|
error = shmget_existing(td, uap, mode, segnum);
|
|
else if ((uap->shmflg & IPC_CREAT) == 0)
|
|
error = ENOENT;
|
|
else
|
|
error = shmget_allocate_segment(td, uap, mode);
|
|
}
|
|
SYSVSHM_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
shmfork_myhook(struct proc *p1, struct proc *p2)
|
|
{
|
|
struct shmmap_state *shmmap_s;
|
|
size_t size;
|
|
int i;
|
|
|
|
SYSVSHM_LOCK();
|
|
size = shminfo.shmseg * sizeof(struct shmmap_state);
|
|
shmmap_s = malloc(size, M_SHM, M_WAITOK);
|
|
bcopy(p1->p_vmspace->vm_shm, shmmap_s, size);
|
|
p2->p_vmspace->vm_shm = shmmap_s;
|
|
for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
|
|
if (shmmap_s->shmid != -1) {
|
|
KASSERT(IPCID_TO_IX(shmmap_s->shmid) >= 0 &&
|
|
IPCID_TO_IX(shmmap_s->shmid) < shmalloced,
|
|
("segnum %d shmalloced %d",
|
|
IPCID_TO_IX(shmmap_s->shmid), shmalloced));
|
|
shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
|
|
}
|
|
}
|
|
SYSVSHM_UNLOCK();
|
|
}
|
|
|
|
static void
|
|
shmexit_myhook(struct vmspace *vm)
|
|
{
|
|
struct shmmap_state *base, *shm;
|
|
int i;
|
|
|
|
base = vm->vm_shm;
|
|
if (base != NULL) {
|
|
vm->vm_shm = NULL;
|
|
SYSVSHM_LOCK();
|
|
for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
|
|
if (shm->shmid != -1)
|
|
shm_delete_mapping(vm, shm);
|
|
}
|
|
SYSVSHM_UNLOCK();
|
|
free(base, M_SHM);
|
|
}
|
|
}
|
|
|
|
static void
|
|
shmrealloc(void)
|
|
{
|
|
struct shmid_kernel *newsegs;
|
|
int i;
|
|
|
|
SYSVSHM_ASSERT_LOCKED();
|
|
|
|
if (shmalloced >= shminfo.shmmni)
|
|
return;
|
|
|
|
newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM,
|
|
M_WAITOK | M_ZERO);
|
|
for (i = 0; i < shmalloced; i++)
|
|
bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
|
|
for (; i < shminfo.shmmni; i++) {
|
|
newsegs[i].u.shm_perm.mode = SHMSEG_FREE;
|
|
newsegs[i].u.shm_perm.seq = 0;
|
|
#ifdef MAC
|
|
mac_sysvshm_init(&newsegs[i]);
|
|
#endif
|
|
}
|
|
free(shmsegs, M_SHM);
|
|
shmsegs = newsegs;
|
|
shmalloced = shminfo.shmmni;
|
|
}
|
|
|
|
static struct syscall_helper_data shm_syscalls[] = {
|
|
SYSCALL_INIT_HELPER(shmat),
|
|
SYSCALL_INIT_HELPER(shmctl),
|
|
SYSCALL_INIT_HELPER(shmdt),
|
|
SYSCALL_INIT_HELPER(shmget),
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl),
|
|
#endif
|
|
#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
|
|
SYSCALL_INIT_HELPER(shmsys),
|
|
#endif
|
|
SYSCALL_INIT_LAST
|
|
};
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
#include <compat/freebsd32/freebsd32.h>
|
|
#include <compat/freebsd32/freebsd32_ipc.h>
|
|
#include <compat/freebsd32/freebsd32_proto.h>
|
|
#include <compat/freebsd32/freebsd32_signal.h>
|
|
#include <compat/freebsd32/freebsd32_syscall.h>
|
|
#include <compat/freebsd32/freebsd32_util.h>
|
|
|
|
static struct syscall_helper_data shm32_syscalls[] = {
|
|
SYSCALL32_INIT_HELPER_COMPAT(shmat),
|
|
SYSCALL32_INIT_HELPER_COMPAT(shmdt),
|
|
SYSCALL32_INIT_HELPER_COMPAT(shmget),
|
|
SYSCALL32_INIT_HELPER(freebsd32_shmsys),
|
|
SYSCALL32_INIT_HELPER(freebsd32_shmctl),
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl),
|
|
#endif
|
|
SYSCALL_INIT_LAST
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
shminit(void)
|
|
{
|
|
struct prison *pr;
|
|
void **rsv;
|
|
int i, error;
|
|
osd_method_t methods[PR_MAXMETHOD] = {
|
|
[PR_METHOD_CHECK] = shm_prison_check,
|
|
[PR_METHOD_SET] = shm_prison_set,
|
|
[PR_METHOD_GET] = shm_prison_get,
|
|
[PR_METHOD_REMOVE] = shm_prison_remove,
|
|
};
|
|
|
|
#ifndef BURN_BRIDGES
|
|
if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0)
|
|
printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n");
|
|
#endif
|
|
if (shminfo.shmmax == SHMMAX) {
|
|
/* Initialize shmmax dealing with possible overflow. */
|
|
for (i = PAGE_SIZE; i != 0; i--) {
|
|
shminfo.shmmax = shminfo.shmall * i;
|
|
if ((shminfo.shmmax / shminfo.shmall) == (u_long)i)
|
|
break;
|
|
}
|
|
}
|
|
shmalloced = shminfo.shmmni;
|
|
shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM,
|
|
M_WAITOK|M_ZERO);
|
|
for (i = 0; i < shmalloced; i++) {
|
|
shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
|
|
shmsegs[i].u.shm_perm.seq = 0;
|
|
#ifdef MAC
|
|
mac_sysvshm_init(&shmsegs[i]);
|
|
#endif
|
|
}
|
|
shm_last_free = 0;
|
|
shm_nused = 0;
|
|
shm_committed = 0;
|
|
sx_init(&sysvshmsx, "sysvshmsx");
|
|
shmexit_hook = &shmexit_myhook;
|
|
shmfork_hook = &shmfork_myhook;
|
|
|
|
/* Set current prisons according to their allow.sysvipc. */
|
|
shm_prison_slot = osd_jail_register(NULL, methods);
|
|
rsv = osd_reserve(shm_prison_slot);
|
|
prison_lock(&prison0);
|
|
(void)osd_jail_set_reserved(&prison0, shm_prison_slot, rsv, &prison0);
|
|
prison_unlock(&prison0);
|
|
rsv = NULL;
|
|
sx_slock(&allprison_lock);
|
|
TAILQ_FOREACH(pr, &allprison, pr_list) {
|
|
if (rsv == NULL)
|
|
rsv = osd_reserve(shm_prison_slot);
|
|
prison_lock(pr);
|
|
if ((pr->pr_allow & PR_ALLOW_SYSVIPC) && pr->pr_ref > 0) {
|
|
(void)osd_jail_set_reserved(pr, shm_prison_slot, rsv,
|
|
&prison0);
|
|
rsv = NULL;
|
|
}
|
|
prison_unlock(pr);
|
|
}
|
|
if (rsv != NULL)
|
|
osd_free_reserved(rsv);
|
|
sx_sunlock(&allprison_lock);
|
|
|
|
error = syscall_helper_register(shm_syscalls, SY_THR_STATIC_KLD);
|
|
if (error != 0)
|
|
return (error);
|
|
#ifdef COMPAT_FREEBSD32
|
|
error = syscall32_helper_register(shm32_syscalls, SY_THR_STATIC_KLD);
|
|
if (error != 0)
|
|
return (error);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
shmunload(void)
|
|
{
|
|
int i;
|
|
|
|
if (shm_nused > 0)
|
|
return (EBUSY);
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
syscall32_helper_unregister(shm32_syscalls);
|
|
#endif
|
|
syscall_helper_unregister(shm_syscalls);
|
|
if (shm_prison_slot != 0)
|
|
osd_jail_deregister(shm_prison_slot);
|
|
|
|
for (i = 0; i < shmalloced; i++) {
|
|
#ifdef MAC
|
|
mac_sysvshm_destroy(&shmsegs[i]);
|
|
#endif
|
|
/*
|
|
* Objects might be still mapped into the processes
|
|
* address spaces. Actual free would happen on the
|
|
* last mapping destruction.
|
|
*/
|
|
if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE)
|
|
vm_object_deallocate(shmsegs[i].object);
|
|
}
|
|
free(shmsegs, M_SHM);
|
|
shmexit_hook = NULL;
|
|
shmfork_hook = NULL;
|
|
sx_destroy(&sysvshmsx);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct shmid_kernel tshmseg;
|
|
#ifdef COMPAT_FREEBSD32
|
|
struct shmid_kernel32 tshmseg32;
|
|
#endif
|
|
struct prison *pr, *rpr;
|
|
void *outaddr;
|
|
size_t outsize;
|
|
int error, i;
|
|
|
|
SYSVSHM_LOCK();
|
|
pr = req->td->td_ucred->cr_prison;
|
|
rpr = shm_find_prison(req->td->td_ucred);
|
|
error = 0;
|
|
for (i = 0; i < shmalloced; i++) {
|
|
if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
|
|
rpr == NULL || shm_prison_cansee(rpr, &shmsegs[i]) != 0) {
|
|
bzero(&tshmseg, sizeof(tshmseg));
|
|
tshmseg.u.shm_perm.mode = SHMSEG_FREE;
|
|
} else {
|
|
tshmseg = shmsegs[i];
|
|
if (tshmseg.cred->cr_prison != pr)
|
|
tshmseg.u.shm_perm.key = IPC_PRIVATE;
|
|
}
|
|
#ifdef COMPAT_FREEBSD32
|
|
if (SV_CURPROC_FLAG(SV_ILP32)) {
|
|
bzero(&tshmseg32, sizeof(tshmseg32));
|
|
freebsd32_ipcperm_out(&tshmseg.u.shm_perm,
|
|
&tshmseg32.u.shm_perm);
|
|
CP(tshmseg, tshmseg32, u.shm_segsz);
|
|
CP(tshmseg, tshmseg32, u.shm_lpid);
|
|
CP(tshmseg, tshmseg32, u.shm_cpid);
|
|
CP(tshmseg, tshmseg32, u.shm_nattch);
|
|
CP(tshmseg, tshmseg32, u.shm_atime);
|
|
CP(tshmseg, tshmseg32, u.shm_dtime);
|
|
CP(tshmseg, tshmseg32, u.shm_ctime);
|
|
/* Don't copy object, label, or cred */
|
|
outaddr = &tshmseg32;
|
|
outsize = sizeof(tshmseg32);
|
|
} else
|
|
#endif
|
|
{
|
|
tshmseg.object = NULL;
|
|
tshmseg.label = NULL;
|
|
tshmseg.cred = NULL;
|
|
outaddr = &tshmseg;
|
|
outsize = sizeof(tshmseg);
|
|
}
|
|
error = SYSCTL_OUT(req, outaddr, outsize);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
SYSVSHM_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
shm_prison_check(void *obj, void *data)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *prpr;
|
|
struct vfsoptlist *opts = data;
|
|
int error, jsys;
|
|
|
|
/*
|
|
* sysvshm is a jailsys integer.
|
|
* It must be "disable" if the parent jail is disabled.
|
|
*/
|
|
error = vfs_copyopt(opts, "sysvshm", &jsys, sizeof(jsys));
|
|
if (error != ENOENT) {
|
|
if (error != 0)
|
|
return (error);
|
|
switch (jsys) {
|
|
case JAIL_SYS_DISABLE:
|
|
break;
|
|
case JAIL_SYS_NEW:
|
|
case JAIL_SYS_INHERIT:
|
|
prison_lock(pr->pr_parent);
|
|
prpr = osd_jail_get(pr->pr_parent, shm_prison_slot);
|
|
prison_unlock(pr->pr_parent);
|
|
if (prpr == NULL)
|
|
return (EPERM);
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
shm_prison_set(void *obj, void *data)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *tpr, *orpr, *nrpr, *trpr;
|
|
struct vfsoptlist *opts = data;
|
|
void *rsv;
|
|
int jsys, descend;
|
|
|
|
/*
|
|
* sysvshm controls which jail is the root of the associated segments
|
|
* (this jail or same as the parent), or if the feature is available
|
|
* at all.
|
|
*/
|
|
if (vfs_copyopt(opts, "sysvshm", &jsys, sizeof(jsys)) == ENOENT)
|
|
jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0)
|
|
? JAIL_SYS_INHERIT
|
|
: vfs_flagopt(opts, "allow.nosysvipc", NULL, 0)
|
|
? JAIL_SYS_DISABLE
|
|
: -1;
|
|
if (jsys == JAIL_SYS_DISABLE) {
|
|
prison_lock(pr);
|
|
orpr = osd_jail_get(pr, shm_prison_slot);
|
|
if (orpr != NULL)
|
|
osd_jail_del(pr, shm_prison_slot);
|
|
prison_unlock(pr);
|
|
if (orpr != NULL) {
|
|
if (orpr == pr)
|
|
shm_prison_cleanup(pr);
|
|
/* Disable all child jails as well. */
|
|
FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
|
|
prison_lock(tpr);
|
|
trpr = osd_jail_get(tpr, shm_prison_slot);
|
|
if (trpr != NULL) {
|
|
osd_jail_del(tpr, shm_prison_slot);
|
|
prison_unlock(tpr);
|
|
if (trpr == tpr)
|
|
shm_prison_cleanup(tpr);
|
|
} else {
|
|
prison_unlock(tpr);
|
|
descend = 0;
|
|
}
|
|
}
|
|
}
|
|
} else if (jsys != -1) {
|
|
if (jsys == JAIL_SYS_NEW)
|
|
nrpr = pr;
|
|
else {
|
|
prison_lock(pr->pr_parent);
|
|
nrpr = osd_jail_get(pr->pr_parent, shm_prison_slot);
|
|
prison_unlock(pr->pr_parent);
|
|
}
|
|
rsv = osd_reserve(shm_prison_slot);
|
|
prison_lock(pr);
|
|
orpr = osd_jail_get(pr, shm_prison_slot);
|
|
if (orpr != nrpr)
|
|
(void)osd_jail_set_reserved(pr, shm_prison_slot, rsv,
|
|
nrpr);
|
|
else
|
|
osd_free_reserved(rsv);
|
|
prison_unlock(pr);
|
|
if (orpr != nrpr) {
|
|
if (orpr == pr)
|
|
shm_prison_cleanup(pr);
|
|
if (orpr != NULL) {
|
|
/* Change child jails matching the old root, */
|
|
FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
|
|
prison_lock(tpr);
|
|
trpr = osd_jail_get(tpr,
|
|
shm_prison_slot);
|
|
if (trpr == orpr) {
|
|
(void)osd_jail_set(tpr,
|
|
shm_prison_slot, nrpr);
|
|
prison_unlock(tpr);
|
|
if (trpr == tpr)
|
|
shm_prison_cleanup(tpr);
|
|
} else {
|
|
prison_unlock(tpr);
|
|
descend = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
shm_prison_get(void *obj, void *data)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *rpr;
|
|
struct vfsoptlist *opts = data;
|
|
int error, jsys;
|
|
|
|
/* Set sysvshm based on the jail's root prison. */
|
|
prison_lock(pr);
|
|
rpr = osd_jail_get(pr, shm_prison_slot);
|
|
prison_unlock(pr);
|
|
jsys = rpr == NULL ? JAIL_SYS_DISABLE
|
|
: rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
|
|
error = vfs_setopt(opts, "sysvshm", &jsys, sizeof(jsys));
|
|
if (error == ENOENT)
|
|
error = 0;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
shm_prison_remove(void *obj, void *data __unused)
|
|
{
|
|
struct prison *pr = obj;
|
|
struct prison *rpr;
|
|
|
|
SYSVSHM_LOCK();
|
|
prison_lock(pr);
|
|
rpr = osd_jail_get(pr, shm_prison_slot);
|
|
prison_unlock(pr);
|
|
if (rpr == pr)
|
|
shm_prison_cleanup(pr);
|
|
SYSVSHM_UNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
shm_prison_cleanup(struct prison *pr)
|
|
{
|
|
struct shmid_kernel *shmseg;
|
|
int i;
|
|
|
|
/* Remove any segments that belong to this jail. */
|
|
for (i = 0; i < shmalloced; i++) {
|
|
shmseg = &shmsegs[i];
|
|
if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) &&
|
|
shmseg->cred != NULL && shmseg->cred->cr_prison == pr) {
|
|
shm_remove(shmseg, i);
|
|
}
|
|
}
|
|
}
|
|
|
|
SYSCTL_JAIL_PARAM_SYS_NODE(sysvshm, CTLFLAG_RW, "SYSV shared memory");
|
|
|
|
#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
|
|
struct oshmid_ds {
|
|
struct ipc_perm_old shm_perm; /* operation perms */
|
|
int shm_segsz; /* size of segment (bytes) */
|
|
u_short shm_cpid; /* pid, creator */
|
|
u_short shm_lpid; /* pid, last operation */
|
|
short shm_nattch; /* no. of current attaches */
|
|
time_t shm_atime; /* last attach time */
|
|
time_t shm_dtime; /* last detach time */
|
|
time_t shm_ctime; /* last change time */
|
|
void *shm_handle; /* internal handle for shm segment */
|
|
};
|
|
|
|
struct oshmctl_args {
|
|
int shmid;
|
|
int cmd;
|
|
struct oshmid_ds *ubuf;
|
|
};
|
|
|
|
static int
|
|
oshmctl(struct thread *td, struct oshmctl_args *uap)
|
|
{
|
|
#ifdef COMPAT_43
|
|
int error = 0;
|
|
struct prison *rpr;
|
|
struct shmid_kernel *shmseg;
|
|
struct oshmid_ds outbuf;
|
|
|
|
rpr = shm_find_prison(td->td_ucred);
|
|
if (rpr == NULL)
|
|
return (ENOSYS);
|
|
if (uap->cmd != IPC_STAT) {
|
|
return (freebsd7_shmctl(td,
|
|
(struct freebsd7_shmctl_args *)uap));
|
|
}
|
|
SYSVSHM_LOCK();
|
|
shmseg = shm_find_segment(rpr, uap->shmid, true);
|
|
if (shmseg == NULL) {
|
|
SYSVSHM_UNLOCK();
|
|
return (EINVAL);
|
|
}
|
|
error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
|
|
if (error != 0) {
|
|
SYSVSHM_UNLOCK();
|
|
return (error);
|
|
}
|
|
#ifdef MAC
|
|
error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
|
|
if (error != 0) {
|
|
SYSVSHM_UNLOCK();
|
|
return (error);
|
|
}
|
|
#endif
|
|
ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm);
|
|
outbuf.shm_segsz = shmseg->u.shm_segsz;
|
|
outbuf.shm_cpid = shmseg->u.shm_cpid;
|
|
outbuf.shm_lpid = shmseg->u.shm_lpid;
|
|
outbuf.shm_nattch = shmseg->u.shm_nattch;
|
|
outbuf.shm_atime = shmseg->u.shm_atime;
|
|
outbuf.shm_dtime = shmseg->u.shm_dtime;
|
|
outbuf.shm_ctime = shmseg->u.shm_ctime;
|
|
outbuf.shm_handle = shmseg->object;
|
|
SYSVSHM_UNLOCK();
|
|
return (copyout(&outbuf, uap->ubuf, sizeof(outbuf)));
|
|
#else
|
|
return (EINVAL);
|
|
#endif
|
|
}
|
|
|
|
/* XXX casting to (sy_call_t *) is bogus, as usual. */
|
|
static sy_call_t *shmcalls[] = {
|
|
(sy_call_t *)sys_shmat, (sy_call_t *)oshmctl,
|
|
(sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget,
|
|
(sy_call_t *)freebsd7_shmctl
|
|
};
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
/* XXX actually varargs. */
|
|
struct shmsys_args {
|
|
int which;
|
|
int a2;
|
|
int a3;
|
|
int a4;
|
|
};
|
|
#endif
|
|
int
|
|
sys_shmsys(struct thread *td, struct shmsys_args *uap)
|
|
{
|
|
|
|
AUDIT_ARG_SVIPC_WHICH(uap->which);
|
|
if (uap->which < 0 || uap->which >= nitems(shmcalls))
|
|
return (EINVAL);
|
|
return ((*shmcalls[uap->which])(td, &uap->a2));
|
|
}
|
|
|
|
#endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
|
|
int
|
|
freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap)
|
|
{
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
AUDIT_ARG_SVIPC_WHICH(uap->which);
|
|
switch (uap->which) {
|
|
case 0: { /* shmat */
|
|
struct shmat_args ap;
|
|
|
|
ap.shmid = uap->a2;
|
|
ap.shmaddr = PTRIN(uap->a3);
|
|
ap.shmflg = uap->a4;
|
|
return (sysent[SYS_shmat].sy_call(td, &ap));
|
|
}
|
|
case 2: { /* shmdt */
|
|
struct shmdt_args ap;
|
|
|
|
ap.shmaddr = PTRIN(uap->a2);
|
|
return (sysent[SYS_shmdt].sy_call(td, &ap));
|
|
}
|
|
case 3: { /* shmget */
|
|
struct shmget_args ap;
|
|
|
|
ap.key = uap->a2;
|
|
ap.size = uap->a3;
|
|
ap.shmflg = uap->a4;
|
|
return (sysent[SYS_shmget].sy_call(td, &ap));
|
|
}
|
|
case 4: { /* shmctl */
|
|
struct freebsd7_freebsd32_shmctl_args ap;
|
|
|
|
ap.shmid = uap->a2;
|
|
ap.cmd = uap->a3;
|
|
ap.buf = PTRIN(uap->a4);
|
|
return (freebsd7_freebsd32_shmctl(td, &ap));
|
|
}
|
|
case 1: /* oshmctl */
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
#else
|
|
return (nosys(td, NULL));
|
|
#endif
|
|
}
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
int
|
|
freebsd7_freebsd32_shmctl(struct thread *td,
|
|
struct freebsd7_freebsd32_shmctl_args *uap)
|
|
{
|
|
int error;
|
|
union {
|
|
struct shmid_ds shmid_ds;
|
|
struct shm_info shm_info;
|
|
struct shminfo shminfo;
|
|
} u;
|
|
union {
|
|
struct shmid_ds32_old shmid_ds32;
|
|
struct shm_info32 shm_info32;
|
|
struct shminfo32 shminfo32;
|
|
} u32;
|
|
size_t sz;
|
|
|
|
if (uap->cmd == IPC_SET) {
|
|
if ((error = copyin(uap->buf, &u32.shmid_ds32,
|
|
sizeof(u32.shmid_ds32))))
|
|
goto done;
|
|
freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm,
|
|
&u.shmid_ds.shm_perm);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
|
|
}
|
|
|
|
error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
|
|
if (error)
|
|
goto done;
|
|
|
|
/* Cases in which we need to copyout */
|
|
switch (uap->cmd) {
|
|
case IPC_INFO:
|
|
CP(u.shminfo, u32.shminfo32, shmmax);
|
|
CP(u.shminfo, u32.shminfo32, shmmin);
|
|
CP(u.shminfo, u32.shminfo32, shmmni);
|
|
CP(u.shminfo, u32.shminfo32, shmseg);
|
|
CP(u.shminfo, u32.shminfo32, shmall);
|
|
error = copyout(&u32.shminfo32, uap->buf,
|
|
sizeof(u32.shminfo32));
|
|
break;
|
|
case SHM_INFO:
|
|
CP(u.shm_info, u32.shm_info32, used_ids);
|
|
CP(u.shm_info, u32.shm_info32, shm_rss);
|
|
CP(u.shm_info, u32.shm_info32, shm_tot);
|
|
CP(u.shm_info, u32.shm_info32, shm_swp);
|
|
CP(u.shm_info, u32.shm_info32, swap_attempts);
|
|
CP(u.shm_info, u32.shm_info32, swap_successes);
|
|
error = copyout(&u32.shm_info32, uap->buf,
|
|
sizeof(u32.shm_info32));
|
|
break;
|
|
case SHM_STAT:
|
|
case IPC_STAT:
|
|
memset(&u32.shmid_ds32, 0, sizeof(u32.shmid_ds32));
|
|
freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm,
|
|
&u32.shmid_ds32.shm_perm);
|
|
if (u.shmid_ds.shm_segsz > INT32_MAX)
|
|
u32.shmid_ds32.shm_segsz = INT32_MAX;
|
|
else
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
|
|
u32.shmid_ds32.shm_internal = 0;
|
|
error = copyout(&u32.shmid_ds32, uap->buf,
|
|
sizeof(u32.shmid_ds32));
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (error) {
|
|
/* Invalidate the return value */
|
|
td->td_retval[0] = -1;
|
|
}
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap)
|
|
{
|
|
int error;
|
|
union {
|
|
struct shmid_ds shmid_ds;
|
|
struct shm_info shm_info;
|
|
struct shminfo shminfo;
|
|
} u;
|
|
union {
|
|
struct shmid_ds32 shmid_ds32;
|
|
struct shm_info32 shm_info32;
|
|
struct shminfo32 shminfo32;
|
|
} u32;
|
|
size_t sz;
|
|
|
|
if (uap->cmd == IPC_SET) {
|
|
if ((error = copyin(uap->buf, &u32.shmid_ds32,
|
|
sizeof(u32.shmid_ds32))))
|
|
goto done;
|
|
freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm,
|
|
&u.shmid_ds.shm_perm);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
|
|
CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
|
|
}
|
|
|
|
error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
|
|
if (error)
|
|
goto done;
|
|
|
|
/* Cases in which we need to copyout */
|
|
switch (uap->cmd) {
|
|
case IPC_INFO:
|
|
CP(u.shminfo, u32.shminfo32, shmmax);
|
|
CP(u.shminfo, u32.shminfo32, shmmin);
|
|
CP(u.shminfo, u32.shminfo32, shmmni);
|
|
CP(u.shminfo, u32.shminfo32, shmseg);
|
|
CP(u.shminfo, u32.shminfo32, shmall);
|
|
error = copyout(&u32.shminfo32, uap->buf,
|
|
sizeof(u32.shminfo32));
|
|
break;
|
|
case SHM_INFO:
|
|
CP(u.shm_info, u32.shm_info32, used_ids);
|
|
CP(u.shm_info, u32.shm_info32, shm_rss);
|
|
CP(u.shm_info, u32.shm_info32, shm_tot);
|
|
CP(u.shm_info, u32.shm_info32, shm_swp);
|
|
CP(u.shm_info, u32.shm_info32, swap_attempts);
|
|
CP(u.shm_info, u32.shm_info32, swap_successes);
|
|
error = copyout(&u32.shm_info32, uap->buf,
|
|
sizeof(u32.shm_info32));
|
|
break;
|
|
case SHM_STAT:
|
|
case IPC_STAT:
|
|
freebsd32_ipcperm_out(&u.shmid_ds.shm_perm,
|
|
&u32.shmid_ds32.shm_perm);
|
|
if (u.shmid_ds.shm_segsz > INT32_MAX)
|
|
u32.shmid_ds32.shm_segsz = INT32_MAX;
|
|
else
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
|
|
CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
|
|
error = copyout(&u32.shmid_ds32, uap->buf,
|
|
sizeof(u32.shmid_ds32));
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (error) {
|
|
/* Invalidate the return value */
|
|
td->td_retval[0] = -1;
|
|
}
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
|
|
defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
|
|
|
|
#ifndef CP
|
|
#define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0)
|
|
#endif
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct freebsd7_shmctl_args {
|
|
int shmid;
|
|
int cmd;
|
|
struct shmid_ds_old *buf;
|
|
};
|
|
#endif
|
|
int
|
|
freebsd7_shmctl(struct thread *td, struct freebsd7_shmctl_args *uap)
|
|
{
|
|
int error;
|
|
struct shmid_ds_old old;
|
|
struct shmid_ds buf;
|
|
size_t bufsz;
|
|
|
|
/*
|
|
* The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
|
|
* Linux binaries. If we see the call come through the FreeBSD ABI,
|
|
* return an error back to the user since we do not to support this.
|
|
*/
|
|
if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
|
|
uap->cmd == SHM_STAT)
|
|
return (EINVAL);
|
|
|
|
/* IPC_SET needs to copyin the buffer before calling kern_shmctl */
|
|
if (uap->cmd == IPC_SET) {
|
|
if ((error = copyin(uap->buf, &old, sizeof(old))))
|
|
goto done;
|
|
ipcperm_old2new(&old.shm_perm, &buf.shm_perm);
|
|
CP(old, buf, shm_segsz);
|
|
CP(old, buf, shm_lpid);
|
|
CP(old, buf, shm_cpid);
|
|
CP(old, buf, shm_nattch);
|
|
CP(old, buf, shm_atime);
|
|
CP(old, buf, shm_dtime);
|
|
CP(old, buf, shm_ctime);
|
|
}
|
|
|
|
error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
|
|
if (error)
|
|
goto done;
|
|
|
|
/* Cases in which we need to copyout */
|
|
switch (uap->cmd) {
|
|
case IPC_STAT:
|
|
memset(&old, 0, sizeof(old));
|
|
ipcperm_new2old(&buf.shm_perm, &old.shm_perm);
|
|
if (buf.shm_segsz > INT_MAX)
|
|
old.shm_segsz = INT_MAX;
|
|
else
|
|
CP(buf, old, shm_segsz);
|
|
CP(buf, old, shm_lpid);
|
|
CP(buf, old, shm_cpid);
|
|
if (buf.shm_nattch > SHRT_MAX)
|
|
old.shm_nattch = SHRT_MAX;
|
|
else
|
|
CP(buf, old, shm_nattch);
|
|
CP(buf, old, shm_atime);
|
|
CP(buf, old, shm_dtime);
|
|
CP(buf, old, shm_ctime);
|
|
old.shm_internal = NULL;
|
|
error = copyout(&old, uap->buf, sizeof(old));
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (error) {
|
|
/* Invalidate the return value */
|
|
td->td_retval[0] = -1;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
|
|
COMPAT_FREEBSD7 */
|
|
|
|
static int
|
|
sysvshm_modload(struct module *module, int cmd, void *arg)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (cmd) {
|
|
case MOD_LOAD:
|
|
error = shminit();
|
|
if (error != 0)
|
|
shmunload();
|
|
break;
|
|
case MOD_UNLOAD:
|
|
error = shmunload();
|
|
break;
|
|
case MOD_SHUTDOWN:
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static moduledata_t sysvshm_mod = {
|
|
"sysvshm",
|
|
&sysvshm_modload,
|
|
NULL
|
|
};
|
|
|
|
DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST);
|
|
MODULE_VERSION(sysvshm, 1);
|