Index: head/lib/libc/sys/shmctl.2 =================================================================== --- head/lib/libc/sys/shmctl.2 (revision 289111) +++ head/lib/libc/sys/shmctl.2 (revision 289112) @@ -1,138 +1,141 @@ .\" .\" Copyright (c) 1995 David Hovemeyer .\" .\" 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. .\" .\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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. .\" .\" $FreeBSD$ .\" -.Dd July 17, 1995 +.Dd October 10, 2015 .Dt SHMCTL 2 .Os .Sh NAME .Nm shmctl .Nd shared memory control .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In sys/types.h .In sys/ipc.h .In sys/shm.h .Ft int .Fn shmctl "int shmid" "int cmd" "struct shmid_ds *buf" .Sh DESCRIPTION Performs the action specified by .Fa cmd on the shared memory segment identified by .Fa shmid : .Bl -tag -width SHM_UNLOCKX .It Dv IPC_STAT Fetch the segment's .Fa "struct shmid_ds" , storing it in the memory pointed to by .Fa buf . .\" .\" XXX need to make sure that this is correct for FreeBSD .\" .It Dv IPC_SET Changes the .Fa shm_perm.uid , .Fa shm_perm.gid , and .Fa shm_perm.mode members of the segment's .Fa "struct shmid_ds" to match those of the struct pointed to by .Fa buf . The calling process's effective uid must match either .Fa shm_perm.uid or .Fa shm_perm.cuid , or it must have superuser privileges. .It Dv IPC_RMID Removes the segment from the system. The removal will not take -effect until all processes having attached the segment have exited; -however, once the IPC_RMID operation has taken place, no further -processes will be allowed to attach the segment. +effect until all processes having attached the segment have exited. For the operation to succeed, the calling process's effective uid must match .Fa shm_perm.uid or .Fa shm_perm.cuid , or the process must have superuser privileges. +If the +.Va kern.ipc.shm_allow_removed +.Xr sysctl 3 +variable is set to 0, once the IPC_RMID operation has taken place, +no further processes will be allowed to attach the segment. .\" .It Dv SHM_LOCK .\" Locks the segment in memory. The calling process must have .\" superuser privileges. Not implemented in FreeBSD. .\" .It Dv SHM_UNLOCK .\" Unlocks the segment from memory. The calling process must .\" have superuser privileges. Not implemented in FreeBSD. .El .Pp The .Vt shmid_ds structure is defined as follows: .\" .\" I fiddled with the spaces a bit to make it fit well when viewed .\" with nroff, but otherwise it is straight from sys/shm.h .\" .Bd -literal struct shmid_ds { struct ipc_perm shm_perm; /* operation permission structure */ size_t shm_segsz; /* size of segment in bytes */ pid_t shm_lpid; /* process ID of last shared memory op */ pid_t shm_cpid; /* process ID of creator */ int shm_nattch; /* number of current attaches */ time_t shm_atime; /* time of last shmat() */ time_t shm_dtime; /* time of last shmdt() */ time_t shm_ctime; /* time of last change by shmctl() */ }; .Ed .Sh RETURN VALUES .Rv -std shmctl .Sh ERRORS The .Fn shmctl system call will fail if: .Bl -tag -width Er .It Bq Er EINVAL Invalid operation, or no shared memory segment was found corresponding to .Fa shmid . .\" .\" XXX I think the following is right: ipcperm() only returns EPERM .\" when an attempt is made to modify (IPC_M) by a non-creator .\" non-owner .It Bq Er EPERM The calling process's effective uid does not match the uid of the shared memory segment's owner or creator. .It Bq Er EACCES Permission denied due to mismatch between operation and mode of shared memory segment. .El .Sh "SEE ALSO" .Xr shmat 2 , .Xr shmdt 2 , .Xr shmget 2 , .Xr ftok 3 Index: head/sys/kern/sysv_shm.c =================================================================== --- head/sys/kern/sysv_shm.c (revision 289111) +++ head/sys/kern/sysv_shm.c (revision 289112) @@ -1,1364 +1,1364 @@ /* $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 __FBSDID("$FreeBSD$"); #include "opt_compat.h" #include "opt_sysvipc.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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 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(int, bool); 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 = SHMMAX, .shmmin = SHMMIN, .shmmni = SHMMNI, .shmseg = SHMSEG, .shmall = SHMALL }; static int shm_use_phys; -static int shm_allow_removed; +static int shm_allow_removed = 1; SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RWTUN, &shminfo.shmmax, 0, "Maximum shared memory segment size"); SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RWTUN, &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_RWTUN, &shminfo.shmall, 0, "Maximum number of pages available for shared memory"); SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RWTUN, &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core"); SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RWTUN, &shm_allow_removed, 0, "Enable/Disable attachment to attached segments marked for removal"); SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "", "Current number of shared memory segments allocated"); static struct sx sysvshmsx; #define SYSVSHM_LOCK() sx_xlock(&sysvshmsx) #define SYSVSHM_UNLOCK() sx_xunlock(&sysvshmsx) #define SYSVSHM_ASSERT_LOCKED() sx_assert(&sysvshmsx, SA_XLOCKED) static int shm_find_segment_by_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); } /* * Finds segment either by shmid if is_shmid is true, or by segnum if * is_shmid is false. */ static struct shmid_kernel * shm_find_segment(int arg, bool is_shmid) { struct shmid_kernel *shmseg; int segnum; segnum = is_shmid ? IPCID_TO_IX(arg) : arg; 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) || (is_shmid && shmseg->u.shm_perm.seq != IPCID_TO_SEQ(arg))) return (NULL); return (shmseg); } static void shm_deallocate_segment(struct shmid_kernel *shmseg) { vm_size_t size; SYSVSHM_ASSERT_LOCKED(); 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; SYSVSHM_ASSERT_LOCKED(); segnum = IPCID_TO_IX(shmmap_s->shmid); KASSERT(segnum >= 0 && segnum < shmalloced, ("segnum %d shmalloced %d", segnum, shmalloced)); 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); } static int kern_shmdt_locked(struct thread *td, const void *shmaddr) { struct proc *p = td->td_proc; struct shmmap_state *shmmap_s; #ifdef MAC struct shmid_kernel *shmsegptr; int error; #endif int i; SYSVSHM_ASSERT_LOCKED(); if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) return (ENOSYS); shmmap_s = p->p_vmspace->vm_shm; if (shmmap_s == NULL) return (EINVAL); for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { if (shmmap_s->shmid != -1 && shmmap_s->va == (vm_offset_t)shmaddr) { break; } } if (i == shminfo.shmseg) return (EINVAL); #ifdef MAC shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr); if (error != 0) return (error); #endif return (shm_delete_mapping(p->p_vmspace, shmmap_s)); } #ifndef _SYS_SYSPROTO_H_ struct shmdt_args { const void *shmaddr; }; #endif int sys_shmdt(struct thread *td, struct shmdt_args *uap) { int error; SYSVSHM_LOCK(); error = kern_shmdt_locked(td, uap->shmaddr); SYSVSHM_UNLOCK(); return (error); } static int kern_shmat_locked(struct thread *td, int shmid, const void *shmaddr, int shmflg) { struct proc *p = td->td_proc; struct shmid_kernel *shmseg; struct shmmap_state *shmmap_s; vm_offset_t attach_va; vm_prot_t prot; vm_size_t size; int error, i, rv; SYSVSHM_ASSERT_LOCKED(); if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) return (ENOSYS); 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; KASSERT(p->p_vmspace->vm_shm == NULL, ("raced")); p->p_vmspace->vm_shm = shmmap_s; } shmseg = shm_find_segment(shmid, true); if (shmseg == NULL) return (EINVAL); error = ipcperm(td, &shmseg->u.shm_perm, (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); if (error != 0) return (error); #ifdef MAC error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); if (error != 0) return (error); #endif for (i = 0; i < shminfo.shmseg; i++) { if (shmmap_s->shmid == -1) break; shmmap_s++; } if (i >= shminfo.shmseg) return (EMFILE); size = round_page(shmseg->u.shm_segsz); prot = VM_PROT_READ; if ((shmflg & SHM_RDONLY) == 0) prot |= VM_PROT_WRITE; if (shmaddr != NULL) { if ((shmflg & SHM_RND) != 0) attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1); else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) attach_va = (vm_offset_t)shmaddr; else return (EINVAL); } else { /* * This is just a hint to vm_map_find() about where to * put it. */ attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + lim_max(td, RLIMIT_DATA)); } vm_object_reference(shmseg->object); rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 0, &attach_va, size, 0, shmaddr != NULL ? VMFS_NO_SPACE : VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE | MAP_PREFAULT_PARTIAL); 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 shmid_kernel *shmseg; struct shmid_ds *shmidp; struct shm_info shm_info; int error; SYSVSHM_ASSERT_LOCKED(); if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) return (ENOSYS); 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(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: error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); if (error != 0) return (error); memcpy(buf, &shmseg->u, sizeof(struct shmid_ds)); 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; 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); 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; } 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 (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) 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(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); 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 #include #include #include #include #include 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) { 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 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); 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; 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); 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) { int error; SYSVSHM_LOCK(); error = SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])); SYSVSHM_UNLOCK(); return (error); } #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); if (uap->cmd != IPC_STAT) { return (freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap)); } SYSVSHM_LOCK(); shmseg = shm_find_segment(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) { if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC)) return (ENOSYS); 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) 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: 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: 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);