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-rw-r--r--sys/kern/sysv_shm.c1406
1 files changed, 1406 insertions, 0 deletions
diff --git a/sys/kern/sysv_shm.c b/sys/kern/sysv_shm.c
new file mode 100644
index 0000000..5c35514
--- /dev/null
+++ b/sys/kern/sysv_shm.c
@@ -0,0 +1,1406 @@
+/* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */
+/*-
+ * Copyright (c) 1994 Adam Glass and Charles Hannum. All rights reserved.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Adam Glass and Charles
+ * Hannum.
+ * 4. The names of the authors may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
+ */
+/*-
+ * Copyright (c) 2003-2005 McAfee, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project in part by McAfee
+ * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
+ * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
+ * program.
+ *
+ * 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("$FreeBSD$");
+
+#include "opt_compat.h"
+#include "opt_sysvipc.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/sysctl.h>
+#include <sys/shm.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/mman.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/racct.h>
+#include <sys/resourcevar.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/syscallsubr.h>
+#include <sys/sysent.h>
+#include <sys/sysproto.h>
+#include <sys/jail.h>
+
+#include <security/mac/mac_framework.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+#include <vm/vm_object.h>
+#include <vm/vm_map.h>
+#include <vm/vm_page.h>
+#include <vm/vm_pager.h>
+
+FEATURE(sysv_shm, "System V shared memory segments support");
+
+static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
+
+static int shmget_allocate_segment(struct thread *td,
+ struct shmget_args *uap, int mode);
+static int shmget_existing(struct thread *td, struct shmget_args *uap,
+ int mode, int segnum);
+
+#define SHMSEG_FREE 0x0200
+#define SHMSEG_REMOVED 0x0400
+#define SHMSEG_ALLOCATED 0x0800
+#define SHMSEG_WANTED 0x1000
+
+static int shm_last_free, shm_nused, shmalloced;
+vm_size_t shm_committed;
+static struct shmid_kernel *shmsegs;
+
+struct shmmap_state {
+ vm_offset_t va;
+ int shmid;
+};
+
+static void shm_deallocate_segment(struct shmid_kernel *);
+static int shm_find_segment_by_key(key_t);
+static struct shmid_kernel *shm_find_segment_by_shmid(int);
+static struct shmid_kernel *shm_find_segment_by_shmidx(int);
+static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
+static void shmrealloc(void);
+static int shminit(void);
+static int sysvshm_modload(struct module *, int, void *);
+static int shmunload(void);
+static void shmexit_myhook(struct vmspace *vm);
+static void shmfork_myhook(struct proc *p1, struct proc *p2);
+static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
+
+/*
+ * Tuneable values.
+ */
+#ifndef SHMMAXPGS
+#define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */
+#endif
+#ifndef SHMMAX
+#define SHMMAX (SHMMAXPGS*PAGE_SIZE)
+#endif
+#ifndef SHMMIN
+#define SHMMIN 1
+#endif
+#ifndef SHMMNI
+#define SHMMNI 192
+#endif
+#ifndef SHMSEG
+#define SHMSEG 128
+#endif
+#ifndef SHMALL
+#define SHMALL (SHMMAXPGS)
+#endif
+
+struct shminfo shminfo = {
+ SHMMAX,
+ SHMMIN,
+ SHMMNI,
+ SHMSEG,
+ SHMALL
+};
+
+static int shm_use_phys;
+static int shm_allow_removed;
+
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0,
+ "Maximum shared memory segment size");
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0,
+ "Minimum shared memory segment size");
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
+ "Number of shared memory identifiers");
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
+ "Number of segments per process");
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0,
+ "Maximum number of pages available for shared memory");
+SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW,
+ &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
+SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW,
+ &shm_allow_removed, 0,
+ "Enable/Disable attachment to attached segments marked for removal");
+SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD,
+ NULL, 0, sysctl_shmsegs, "",
+ "Current number of shared memory segments allocated");
+
+static int
+shm_find_segment_by_key(key)
+ key_t key;
+{
+ int i;
+
+ for (i = 0; i < shmalloced; i++)
+ if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
+ shmsegs[i].u.shm_perm.key == key)
+ return (i);
+ return (-1);
+}
+
+static struct shmid_kernel *
+shm_find_segment_by_shmid(int shmid)
+{
+ int segnum;
+ struct shmid_kernel *shmseg;
+
+ segnum = IPCID_TO_IX(shmid);
+ if (segnum < 0 || segnum >= shmalloced)
+ return (NULL);
+ shmseg = &shmsegs[segnum];
+ if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
+ (!shm_allow_removed &&
+ (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
+ shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid))
+ return (NULL);
+ return (shmseg);
+}
+
+static struct shmid_kernel *
+shm_find_segment_by_shmidx(int segnum)
+{
+ struct shmid_kernel *shmseg;
+
+ if (segnum < 0 || segnum >= shmalloced)
+ return (NULL);
+ shmseg = &shmsegs[segnum];
+ if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
+ (!shm_allow_removed &&
+ (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0))
+ return (NULL);
+ return (shmseg);
+}
+
+static void
+shm_deallocate_segment(shmseg)
+ struct shmid_kernel *shmseg;
+{
+ vm_size_t size;
+
+ GIANT_REQUIRED;
+
+ vm_object_deallocate(shmseg->object);
+ shmseg->object = NULL;
+ size = round_page(shmseg->u.shm_segsz);
+ shm_committed -= btoc(size);
+ shm_nused--;
+ shmseg->u.shm_perm.mode = SHMSEG_FREE;
+#ifdef MAC
+ mac_sysvshm_cleanup(shmseg);
+#endif
+ racct_sub_cred(shmseg->cred, RACCT_NSHM, 1);
+ racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size);
+ crfree(shmseg->cred);
+ shmseg->cred = NULL;
+}
+
+static int
+shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
+{
+ struct shmid_kernel *shmseg;
+ int segnum, result;
+ vm_size_t size;
+
+ GIANT_REQUIRED;
+
+ segnum = IPCID_TO_IX(shmmap_s->shmid);
+ shmseg = &shmsegs[segnum];
+ size = round_page(shmseg->u.shm_segsz);
+ result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size);
+ if (result != KERN_SUCCESS)
+ return (EINVAL);
+ shmmap_s->shmid = -1;
+ shmseg->u.shm_dtime = time_second;
+ if ((--shmseg->u.shm_nattch <= 0) &&
+ (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
+ shm_deallocate_segment(shmseg);
+ shm_last_free = segnum;
+ }
+ return (0);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct shmdt_args {
+ const void *shmaddr;
+};
+#endif
+int
+sys_shmdt(td, uap)
+ struct thread *td;
+ struct shmdt_args *uap;
+{
+ struct proc *p = td->td_proc;
+ struct shmmap_state *shmmap_s;
+#ifdef MAC
+ struct shmid_kernel *shmsegptr;
+#endif
+ int i;
+ int error = 0;
+
+ if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
+ return (ENOSYS);
+ mtx_lock(&Giant);
+ shmmap_s = p->p_vmspace->vm_shm;
+ if (shmmap_s == NULL) {
+ error = EINVAL;
+ goto done2;
+ }
+ for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
+ if (shmmap_s->shmid != -1 &&
+ shmmap_s->va == (vm_offset_t)uap->shmaddr) {
+ break;
+ }
+ }
+ if (i == shminfo.shmseg) {
+ error = EINVAL;
+ goto done2;
+ }
+#ifdef MAC
+ shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
+ error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr);
+ if (error != 0)
+ goto done2;
+#endif
+ error = shm_delete_mapping(p->p_vmspace, shmmap_s);
+done2:
+ mtx_unlock(&Giant);
+ return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct shmat_args {
+ int shmid;
+ const void *shmaddr;
+ int shmflg;
+};
+#endif
+int
+kern_shmat(td, shmid, shmaddr, shmflg)
+ struct thread *td;
+ int shmid;
+ const void *shmaddr;
+ int shmflg;
+{
+ struct proc *p = td->td_proc;
+ int i, flags;
+ struct shmid_kernel *shmseg;
+ struct shmmap_state *shmmap_s = NULL;
+ vm_offset_t attach_va;
+ vm_prot_t prot;
+ vm_size_t size;
+ int rv;
+ int error = 0;
+
+ if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
+ return (ENOSYS);
+ mtx_lock(&Giant);
+ shmmap_s = p->p_vmspace->vm_shm;
+ if (shmmap_s == NULL) {
+ shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
+ M_SHM, M_WAITOK);
+ for (i = 0; i < shminfo.shmseg; i++)
+ shmmap_s[i].shmid = -1;
+ p->p_vmspace->vm_shm = shmmap_s;
+ }
+ shmseg = shm_find_segment_by_shmid(shmid);
+ if (shmseg == NULL) {
+ error = EINVAL;
+ goto done2;
+ }
+ error = ipcperm(td, &shmseg->u.shm_perm,
+ (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
+ if (error)
+ goto done2;
+#ifdef MAC
+ error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
+ if (error != 0)
+ goto done2;
+#endif
+ for (i = 0; i < shminfo.shmseg; i++) {
+ if (shmmap_s->shmid == -1)
+ break;
+ shmmap_s++;
+ }
+ if (i >= shminfo.shmseg) {
+ error = EMFILE;
+ goto done2;
+ }
+ size = round_page(shmseg->u.shm_segsz);
+ prot = VM_PROT_READ;
+ if ((shmflg & SHM_RDONLY) == 0)
+ prot |= VM_PROT_WRITE;
+ flags = MAP_ANON | MAP_SHARED;
+ if (shmaddr) {
+ flags |= MAP_FIXED;
+ if (shmflg & SHM_RND) {
+ attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1);
+ } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) {
+ attach_va = (vm_offset_t)shmaddr;
+ } else {
+ error = EINVAL;
+ goto done2;
+ }
+ } else {
+ /*
+ * This is just a hint to vm_map_find() about where to
+ * put it.
+ */
+ PROC_LOCK(p);
+ attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
+ lim_max(p, RLIMIT_DATA));
+ PROC_UNLOCK(p);
+ }
+
+ vm_object_reference(shmseg->object);
+ rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
+ 0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE :
+ VMFS_ANY_SPACE, prot, prot, MAP_INHERIT_SHARE);
+ if (rv != KERN_SUCCESS) {
+ vm_object_deallocate(shmseg->object);
+ error = ENOMEM;
+ goto done2;
+ }
+
+ 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;
+done2:
+ mtx_unlock(&Giant);
+ return (error);
+}
+
+int
+sys_shmat(td, uap)
+ struct thread *td;
+ struct shmat_args *uap;
+{
+ return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg);
+}
+
+int
+kern_shmctl(td, shmid, cmd, buf, bufsz)
+ struct thread *td;
+ int shmid;
+ int cmd;
+ void *buf;
+ size_t *bufsz;
+{
+ int error = 0;
+ struct shmid_kernel *shmseg;
+
+ if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
+ return (ENOSYS);
+
+ mtx_lock(&Giant);
+ 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;
+ goto done2;
+ case SHM_INFO: {
+ struct shm_info 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)
+ *bufsz = sizeof(shm_info);
+ td->td_retval[0] = shmalloced;
+ goto done2;
+ }
+ }
+ if (cmd == SHM_STAT)
+ shmseg = shm_find_segment_by_shmidx(shmid);
+ else
+ shmseg = shm_find_segment_by_shmid(shmid);
+ if (shmseg == NULL) {
+ error = EINVAL;
+ goto done2;
+ }
+#ifdef MAC
+ error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
+ if (error != 0)
+ goto done2;
+#endif
+ switch (cmd) {
+ case SHM_STAT:
+ case IPC_STAT:
+ error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
+ if (error)
+ goto done2;
+ memcpy(buf, &shmseg->u, sizeof(struct shmid_ds));
+ if (bufsz)
+ *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: {
+ struct shmid_ds *shmid;
+
+ shmid = (struct shmid_ds *)buf;
+ error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
+ if (error)
+ goto done2;
+ shmseg->u.shm_perm.uid = shmid->shm_perm.uid;
+ shmseg->u.shm_perm.gid = shmid->shm_perm.gid;
+ shmseg->u.shm_perm.mode =
+ (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
+ (shmid->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)
+ goto done2;
+ shmseg->u.shm_perm.key = IPC_PRIVATE;
+ shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
+ if (shmseg->u.shm_nattch <= 0) {
+ shm_deallocate_segment(shmseg);
+ shm_last_free = IPCID_TO_IX(shmid);
+ }
+ break;
+#if 0
+ case SHM_LOCK:
+ case SHM_UNLOCK:
+#endif
+ default:
+ error = EINVAL;
+ break;
+ }
+done2:
+ mtx_unlock(&Giant);
+ return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct shmctl_args {
+ int shmid;
+ int cmd;
+ struct shmid_ds *buf;
+};
+#endif
+int
+sys_shmctl(td, uap)
+ struct thread *td;
+ struct shmctl_args *uap;
+{
+ int error = 0;
+ 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(td, uap, mode, segnum)
+ struct thread *td;
+ struct shmget_args *uap;
+ int mode;
+ int segnum;
+{
+ struct shmid_kernel *shmseg;
+ int error;
+
+ shmseg = &shmsegs[segnum];
+ if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) {
+ /*
+ * This segment is in the process of being allocated. Wait
+ * until it's done, and look the key up again (in case the
+ * allocation failed or it was freed).
+ */
+ shmseg->u.shm_perm.mode |= SHMSEG_WANTED;
+ error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0);
+ if (error)
+ return (error);
+ return (EAGAIN);
+ }
+ 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(td, uap, mode)
+ struct thread *td;
+ struct shmget_args *uap;
+ int mode;
+{
+ int i, segnum, shmid;
+ size_t size;
+ struct ucred *cred = td->td_ucred;
+ struct shmid_kernel *shmseg;
+ vm_object_t shm_object;
+
+ GIANT_REQUIRED;
+
+ 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;
+ }
+ shmseg = &shmsegs[segnum];
+#ifdef RACCT
+ 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
+ /*
+ * In case we sleep in malloc(), mark the segment present but deleted
+ * so that noone else tries to create the same key.
+ */
+ shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
+ shmseg->u.shm_perm.key = uap->key;
+ shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
+ shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
+
+ /*
+ * 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
+ 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);
+ }
+ VM_OBJECT_LOCK(shm_object);
+ vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
+ vm_object_set_flag(shm_object, OBJ_NOSPLIT);
+ VM_OBJECT_UNLOCK(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 = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) |
+ (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
+ 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++;
+ if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) {
+ /*
+ * Somebody else wanted this key while we were asleep. Wake
+ * them up now.
+ */
+ shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED;
+ wakeup(shmseg);
+ }
+ td->td_retval[0] = shmid;
+ return (0);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct shmget_args {
+ key_t key;
+ size_t size;
+ int shmflg;
+};
+#endif
+int
+sys_shmget(td, uap)
+ struct thread *td;
+ struct shmget_args *uap;
+{
+ int segnum, mode;
+ int error;
+
+ if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
+ return (ENOSYS);
+ mtx_lock(&Giant);
+ mode = uap->shmflg & ACCESSPERMS;
+ if (uap->key != IPC_PRIVATE) {
+ again:
+ segnum = shm_find_segment_by_key(uap->key);
+ if (segnum >= 0) {
+ error = shmget_existing(td, uap, mode, segnum);
+ if (error == EAGAIN)
+ goto again;
+ goto done2;
+ }
+ if ((uap->shmflg & IPC_CREAT) == 0) {
+ error = ENOENT;
+ goto done2;
+ }
+ }
+ error = shmget_allocate_segment(td, uap, mode);
+done2:
+ mtx_unlock(&Giant);
+ return (error);
+}
+
+static void
+shmfork_myhook(p1, p2)
+ struct proc *p1, *p2;
+{
+ struct shmmap_state *shmmap_s;
+ size_t size;
+ int i;
+
+ mtx_lock(&Giant);
+ 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)
+ shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
+ mtx_unlock(&Giant);
+}
+
+static void
+shmexit_myhook(struct vmspace *vm)
+{
+ struct shmmap_state *base, *shm;
+ int i;
+
+ if ((base = vm->vm_shm) != NULL) {
+ vm->vm_shm = NULL;
+ mtx_lock(&Giant);
+ for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
+ if (shm->shmid != -1)
+ shm_delete_mapping(vm, shm);
+ }
+ mtx_unlock(&Giant);
+ free(base, M_SHM);
+ }
+}
+
+static void
+shmrealloc(void)
+{
+ int i;
+ struct shmid_kernel *newsegs;
+
+ if (shmalloced >= shminfo.shmmni)
+ return;
+
+ newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);
+ if (newsegs == NULL)
+ return;
+ for (i = 0; i < shmalloced; i++)
+ bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
+ for (; i < shminfo.shmmni; i++) {
+ shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
+ shmsegs[i].u.shm_perm.seq = 0;
+#ifdef MAC
+ mac_sysvshm_init(&shmsegs[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()
+{
+ int i, error;
+
+#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
+ TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall);
+ if (!TUNABLE_ULONG_FETCH("kern.ipc.shmmax", &shminfo.shmmax)) {
+ /* Initialize shmmax dealing with possible overflow. */
+ for (i = PAGE_SIZE; i > 0; i--) {
+ shminfo.shmmax = shminfo.shmall * i;
+ if (shminfo.shmmax >= shminfo.shmall)
+ break;
+ }
+ }
+ TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin);
+ TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni);
+ TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg);
+ TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys);
+
+ shmalloced = shminfo.shmmni;
+ shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);
+ 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;
+ shmexit_hook = &shmexit_myhook;
+ shmfork_hook = &shmfork_myhook;
+
+ error = syscall_helper_register(shm_syscalls);
+ if (error != 0)
+ return (error);
+#ifdef COMPAT_FREEBSD32
+ error = syscall32_helper_register(shm32_syscalls);
+ if (error != 0)
+ return (error);
+#endif
+ return (0);
+}
+
+static int
+shmunload()
+{
+ int i;
+
+ if (shm_nused > 0)
+ return (EBUSY);
+
+#ifdef COMPAT_FREEBSD32
+ syscall32_helper_unregister(shm32_syscalls);
+#endif
+ syscall_helper_unregister(shm_syscalls);
+
+ 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;
+ return (0);
+}
+
+static int
+sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
+{
+
+ return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])));
+}
+
+#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 shmid_kernel *shmseg;
+ struct oshmid_ds outbuf;
+
+ if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
+ return (ENOSYS);
+ mtx_lock(&Giant);
+ shmseg = shm_find_segment_by_shmid(uap->shmid);
+ if (shmseg == NULL) {
+ error = EINVAL;
+ goto done2;
+ }
+ switch (uap->cmd) {
+ case IPC_STAT:
+ error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
+ if (error)
+ goto done2;
+#ifdef MAC
+ error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
+ if (error != 0)
+ goto done2;
+#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;
+ error = copyout(&outbuf, uap->ubuf, sizeof(outbuf));
+ if (error)
+ goto done2;
+ break;
+ default:
+ error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap);
+ break;
+ }
+done2:
+ mtx_unlock(&Giant);
+ return (error);
+#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
+};
+
+int
+sys_shmsys(td, uap)
+ struct thread *td;
+ /* XXX actually varargs. */
+ struct shmsys_args /* {
+ int which;
+ int a2;
+ int a3;
+ int a4;
+ } */ *uap;
+{
+ int error;
+
+ if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
+ return (ENOSYS);
+ if (uap->which < 0 ||
+ uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0]))
+ return (EINVAL);
+ mtx_lock(&Giant);
+ error = (*shmcalls[uap->which])(td, &uap->a2);
+ mtx_unlock(&Giant);
+ return (error);
+}
+
+#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)
+ 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 = 0;
+ 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:
+ 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 = 0;
+ 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(td, uap)
+ struct thread *td;
+ struct freebsd7_shmctl_args *uap;
+{
+ int error = 0;
+ 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:
+ 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);
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