12729Sdfr/* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */ 2139804Simp/*- 32729Sdfr * Copyright (c) 1994 Adam Glass and Charles Hannum. All rights reserved. 42729Sdfr * 52729Sdfr * Redistribution and use in source and binary forms, with or without 62729Sdfr * modification, are permitted provided that the following conditions 72729Sdfr * are met: 82729Sdfr * 1. Redistributions of source code must retain the above copyright 92729Sdfr * notice, this list of conditions and the following disclaimer. 102729Sdfr * 2. Redistributions in binary form must reproduce the above copyright 112729Sdfr * notice, this list of conditions and the following disclaimer in the 122729Sdfr * documentation and/or other materials provided with the distribution. 132729Sdfr * 3. All advertising materials mentioning features or use of this software 142729Sdfr * must display the following acknowledgement: 152729Sdfr * This product includes software developed by Adam Glass and Charles 162729Sdfr * Hannum. 172729Sdfr * 4. The names of the authors may not be used to endorse or promote products 182729Sdfr * derived from this software without specific prior written permission. 192729Sdfr * 202729Sdfr * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 212729Sdfr * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 222729Sdfr * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 232729Sdfr * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 242729Sdfr * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 252729Sdfr * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 262729Sdfr * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 272729Sdfr * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 282729Sdfr * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 292729Sdfr * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 302729Sdfr */ 31140617Srwatson/*- 32140617Srwatson * Copyright (c) 2003-2005 McAfee, Inc. 33140617Srwatson * All rights reserved. 34140617Srwatson * 35140617Srwatson * This software was developed for the FreeBSD Project in part by McAfee 36140617Srwatson * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR 37140617Srwatson * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research 38140617Srwatson * program. 39140617Srwatson * 40140617Srwatson * Redistribution and use in source and binary forms, with or without 41140617Srwatson * modification, are permitted provided that the following conditions 42140617Srwatson * are met: 43140617Srwatson * 1. Redistributions of source code must retain the above copyright 44140617Srwatson * notice, this list of conditions and the following disclaimer. 45140617Srwatson * 2. Redistributions in binary form must reproduce the above copyright 46140617Srwatson * notice, this list of conditions and the following disclaimer in the 47140617Srwatson * documentation and/or other materials provided with the distribution. 48140617Srwatson * 49140617Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 50140617Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51140617Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52140617Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 53140617Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54140617Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55140617Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56140617Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57140617Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58140617Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59140617Srwatson * SUCH DAMAGE. 60140617Srwatson */ 612729Sdfr 62116182Sobrien#include <sys/cdefs.h> 63116182Sobrien__FBSDID("$FreeBSD: releng/11.0/sys/kern/sysv_shm.c 298661 2016-04-26 19:57:35Z cem $"); 64116182Sobrien 6531778Seivind#include "opt_compat.h" 6658820Speter#include "opt_sysvipc.h" 6713255Swollman 682729Sdfr#include <sys/param.h> 6911626Sbde#include <sys/systm.h> 702729Sdfr#include <sys/kernel.h> 71194910Sjhb#include <sys/limits.h> 7276166Smarkm#include <sys/lock.h> 7358820Speter#include <sys/sysctl.h> 742729Sdfr#include <sys/shm.h> 752729Sdfr#include <sys/proc.h> 762729Sdfr#include <sys/malloc.h> 7776941Sjhb#include <sys/mman.h> 78129882Sphk#include <sys/module.h> 7976827Salfred#include <sys/mutex.h> 80220398Strasz#include <sys/racct.h> 81130730Stjr#include <sys/resourcevar.h> 82248084Sattilio#include <sys/rwlock.h> 832729Sdfr#include <sys/stat.h> 8469449Salfred#include <sys/syscall.h> 85114724Smbr#include <sys/syscallsubr.h> 8611626Sbde#include <sys/sysent.h> 8776166Smarkm#include <sys/sysproto.h> 8868024Srwatson#include <sys/jail.h> 892729Sdfr 90163606Srwatson#include <security/mac/mac_framework.h> 91163606Srwatson 922729Sdfr#include <vm/vm.h> 9312662Sdg#include <vm/vm_param.h> 9412662Sdg#include <vm/pmap.h> 9518098Sdyson#include <vm/vm_object.h> 962729Sdfr#include <vm/vm_map.h> 9742957Sdillon#include <vm/vm_page.h> 9818199Sdyson#include <vm/vm_pager.h> 992729Sdfr 100219028SnetchildFEATURE(sysv_shm, "System V shared memory segments support"); 101219028Snetchild 10230354Sphkstatic MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments"); 10330309Sphk 10492723Salfredstatic int shmget_allocate_segment(struct thread *td, 10592723Salfred struct shmget_args *uap, int mode); 10692723Salfredstatic int shmget_existing(struct thread *td, struct shmget_args *uap, 10792723Salfred int mode, int segnum); 1088876Srgrimes 1092729Sdfr#define SHMSEG_FREE 0x0200 1102729Sdfr#define SHMSEG_REMOVED 0x0400 1112729Sdfr#define SHMSEG_ALLOCATED 0x0800 1122729Sdfr 113189283Skibstatic int shm_last_free, shm_nused, shmalloced; 114189398Skibvm_size_t shm_committed; 115298585Sjamiestatic struct shmid_kernel *shmsegs; 116298585Sjamiestatic unsigned shm_prison_slot; 1172729Sdfr 1182729Sdfrstruct shmmap_state { 1192729Sdfr vm_offset_t va; 1202729Sdfr int shmid; 1212729Sdfr}; 1222729Sdfr 123137613Srwatsonstatic void shm_deallocate_segment(struct shmid_kernel *); 124298585Sjamiestatic int shm_find_segment_by_key(struct prison *, key_t); 125298585Sjamiestatic struct shmid_kernel *shm_find_segment(struct prison *, int, bool); 126109205Sdillonstatic int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *); 12792723Salfredstatic void shmrealloc(void); 128205323Skibstatic int shminit(void); 12992723Salfredstatic int sysvshm_modload(struct module *, int, void *); 13092723Salfredstatic int shmunload(void); 131109205Sdillonstatic void shmexit_myhook(struct vmspace *vm); 13292723Salfredstatic void shmfork_myhook(struct proc *p1, struct proc *p2); 13392723Salfredstatic int sysctl_shmsegs(SYSCTL_HANDLER_ARGS); 134298585Sjamiestatic void shm_remove(struct shmid_kernel *, int); 135298585Sjamiestatic struct prison *shm_find_prison(struct ucred *); 136298585Sjamiestatic int shm_prison_cansee(struct prison *, struct shmid_kernel *); 137298585Sjamiestatic int shm_prison_check(void *, void *); 138298585Sjamiestatic int shm_prison_set(void *, void *); 139298585Sjamiestatic int shm_prison_get(void *, void *); 140298585Sjamiestatic int shm_prison_remove(void *, void *); 141298585Sjamiestatic void shm_prison_cleanup(struct prison *); 1422729Sdfr 14358820Speter/* 14477104Sdd * Tuneable values. 14558820Speter */ 14658820Speter#ifndef SHMMAXPGS 147209037Sivoras#define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */ 14858820Speter#endif 14958820Speter#ifndef SHMMAX 15058820Speter#define SHMMAX (SHMMAXPGS*PAGE_SIZE) 15158820Speter#endif 15258820Speter#ifndef SHMMIN 15358820Speter#define SHMMIN 1 15458820Speter#endif 15558820Speter#ifndef SHMMNI 15676275Sdillon#define SHMMNI 192 15758820Speter#endif 15858820Speter#ifndef SHMSEG 15976275Sdillon#define SHMSEG 128 16058820Speter#endif 16158820Speter#ifndef SHMALL 16258820Speter#define SHMALL (SHMMAXPGS) 16358820Speter#endif 16458820Speter 16558820Speterstruct shminfo shminfo = { 166267992Shselasky .shmmax = SHMMAX, 167267992Shselasky .shmmin = SHMMIN, 168267992Shselasky .shmmni = SHMMNI, 169267992Shselasky .shmseg = SHMSEG, 170267992Shselasky .shmall = SHMALL 17158820Speter}; 17258820Speter 17361081Sdillonstatic int shm_use_phys; 174289112Straszstatic int shm_allow_removed = 1; 17561081Sdillon 176267992ShselaskySYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RWTUN, &shminfo.shmmax, 0, 177141710Scsjp "Maximum shared memory segment size"); 178267992ShselaskySYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RWTUN, &shminfo.shmmin, 0, 179141710Scsjp "Minimum shared memory segment size"); 180148782ScsjpSYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0, 181141710Scsjp "Number of shared memory identifiers"); 182148782ScsjpSYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0, 183141710Scsjp "Number of segments per process"); 184267992ShselaskySYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RWTUN, &shminfo.shmall, 0, 185141710Scsjp "Maximum number of pages available for shared memory"); 186267992ShselaskySYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RWTUN, 187141710Scsjp &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core"); 188267992ShselaskySYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RWTUN, 189141710Scsjp &shm_allow_removed, 0, 190141710Scsjp "Enable/Disable attachment to attached segments marked for removal"); 191280323SkibSYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD | 192280323Skib CTLFLAG_MPSAFE, NULL, 0, sysctl_shmsegs, "", 193141710Scsjp "Current number of shared memory segments allocated"); 19458820Speter 195280323Skibstatic struct sx sysvshmsx; 196280323Skib#define SYSVSHM_LOCK() sx_xlock(&sysvshmsx) 197280323Skib#define SYSVSHM_UNLOCK() sx_xunlock(&sysvshmsx) 198280323Skib#define SYSVSHM_ASSERT_LOCKED() sx_assert(&sysvshmsx, SA_XLOCKED) 199280323Skib 2002729Sdfrstatic int 201298585Sjamieshm_find_segment_by_key(struct prison *pr, key_t key) 2022729Sdfr{ 2032729Sdfr int i; 2042729Sdfr 20558820Speter for (i = 0; i < shmalloced; i++) 206137613Srwatson if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && 207298585Sjamie shmsegs[i].cred != NULL && 208298585Sjamie shmsegs[i].cred->cr_prison == pr && 209137613Srwatson shmsegs[i].u.shm_perm.key == key) 210101891Salfred return (i); 211101891Salfred return (-1); 2122729Sdfr} 2132729Sdfr 214280323Skib/* 215280323Skib * Finds segment either by shmid if is_shmid is true, or by segnum if 216280323Skib * is_shmid is false. 217280323Skib */ 218137613Srwatsonstatic struct shmid_kernel * 219298585Sjamieshm_find_segment(struct prison *rpr, int arg, bool is_shmid) 2202729Sdfr{ 221280323Skib struct shmid_kernel *shmseg; 2222729Sdfr int segnum; 2232729Sdfr 224280323Skib segnum = is_shmid ? IPCID_TO_IX(arg) : arg; 22558820Speter if (segnum < 0 || segnum >= shmalloced) 226101891Salfred return (NULL); 2272729Sdfr shmseg = &shmsegs[segnum]; 228137613Srwatson if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 229122088Sfjoe (!shm_allow_removed && 230285057Smjg (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) || 231298585Sjamie (is_shmid && shmseg->u.shm_perm.seq != IPCID_TO_SEQ(arg)) || 232298597Sjamie shm_prison_cansee(rpr, shmseg) != 0) 233101891Salfred return (NULL); 234101891Salfred return (shmseg); 2352729Sdfr} 2362729Sdfr 2372729Sdfrstatic void 238280323Skibshm_deallocate_segment(struct shmid_kernel *shmseg) 2392729Sdfr{ 240189398Skib vm_size_t size; 2412729Sdfr 242280323Skib SYSVSHM_ASSERT_LOCKED(); 24379224Sdillon 244194910Sjhb vm_object_deallocate(shmseg->object); 245194910Sjhb shmseg->object = NULL; 246194910Sjhb size = round_page(shmseg->u.shm_segsz); 2472729Sdfr shm_committed -= btoc(size); 2482729Sdfr shm_nused--; 249137613Srwatson shmseg->u.shm_perm.mode = SHMSEG_FREE; 250140617Srwatson#ifdef MAC 251172930Srwatson mac_sysvshm_cleanup(shmseg); 252140617Srwatson#endif 253220398Strasz racct_sub_cred(shmseg->cred, RACCT_NSHM, 1); 254220398Strasz racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size); 255220388Strasz crfree(shmseg->cred); 256220388Strasz shmseg->cred = NULL; 2572729Sdfr} 2582729Sdfr 2592729Sdfrstatic int 260109205Sdillonshm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s) 2612729Sdfr{ 262137613Srwatson struct shmid_kernel *shmseg; 2632729Sdfr int segnum, result; 264189398Skib vm_size_t size; 2658876Srgrimes 266280323Skib SYSVSHM_ASSERT_LOCKED(); 267280323Skib segnum = IPCID_TO_IX(shmmap_s->shmid); 268280323Skib KASSERT(segnum >= 0 && segnum < shmalloced, 269280323Skib ("segnum %d shmalloced %d", segnum, shmalloced)); 27077104Sdd 2712729Sdfr shmseg = &shmsegs[segnum]; 272194910Sjhb size = round_page(shmseg->u.shm_segsz); 273109205Sdillon result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size); 2742729Sdfr if (result != KERN_SUCCESS) 275101891Salfred return (EINVAL); 2762729Sdfr shmmap_s->shmid = -1; 277137613Srwatson shmseg->u.shm_dtime = time_second; 278137613Srwatson if ((--shmseg->u.shm_nattch <= 0) && 279137613Srwatson (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) { 2802729Sdfr shm_deallocate_segment(shmseg); 2812729Sdfr shm_last_free = segnum; 2822729Sdfr } 283101891Salfred return (0); 2842729Sdfr} 2852729Sdfr 286298585Sjamiestatic void 287298585Sjamieshm_remove(struct shmid_kernel *shmseg, int segnum) 288298585Sjamie{ 289298585Sjamie 290298585Sjamie shmseg->u.shm_perm.key = IPC_PRIVATE; 291298585Sjamie shmseg->u.shm_perm.mode |= SHMSEG_REMOVED; 292298585Sjamie if (shmseg->u.shm_nattch <= 0) { 293298585Sjamie shm_deallocate_segment(shmseg); 294298585Sjamie shm_last_free = segnum; 295298585Sjamie } 296298585Sjamie} 297298585Sjamie 298298585Sjamiestatic struct prison * 299298585Sjamieshm_find_prison(struct ucred *cred) 300298585Sjamie{ 301298585Sjamie struct prison *pr, *rpr; 302298585Sjamie 303298585Sjamie pr = cred->cr_prison; 304298585Sjamie prison_lock(pr); 305298585Sjamie rpr = osd_jail_get(pr, shm_prison_slot); 306298585Sjamie prison_unlock(pr); 307298585Sjamie return rpr; 308298585Sjamie} 309298585Sjamie 310280323Skibstatic int 311298585Sjamieshm_prison_cansee(struct prison *rpr, struct shmid_kernel *shmseg) 312298585Sjamie{ 313298585Sjamie 314298585Sjamie if (shmseg->cred == NULL || 315298585Sjamie !(rpr == shmseg->cred->cr_prison || 316298585Sjamie prison_ischild(rpr, shmseg->cred->cr_prison))) 317298585Sjamie return (EINVAL); 318298585Sjamie return (0); 319298585Sjamie} 320298585Sjamie 321298585Sjamiestatic int 322280323Skibkern_shmdt_locked(struct thread *td, const void *shmaddr) 3232729Sdfr{ 32483366Sjulian struct proc *p = td->td_proc; 3252729Sdfr struct shmmap_state *shmmap_s; 326140617Srwatson#ifdef MAC 327140617Srwatson struct shmid_kernel *shmsegptr; 328285057Smjg int error; 329140617Srwatson#endif 330285057Smjg int i; 3312729Sdfr 332280323Skib SYSVSHM_ASSERT_LOCKED(); 333298585Sjamie if (shm_find_prison(td->td_ucred) == NULL) 33491703Sjhb return (ENOSYS); 335100512Salfred shmmap_s = p->p_vmspace->vm_shm; 336280323Skib if (shmmap_s == NULL) 337280323Skib return (EINVAL); 33882607Sdillon for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 3392729Sdfr if (shmmap_s->shmid != -1 && 340280323Skib shmmap_s->va == (vm_offset_t)shmaddr) { 3412729Sdfr break; 34282607Sdillon } 34382607Sdillon } 344280323Skib if (i == shminfo.shmseg) 345280323Skib return (EINVAL); 346140617Srwatson#ifdef MAC 347140617Srwatson shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; 348172930Srwatson error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr); 349162468Srwatson if (error != 0) 350280323Skib return (error); 351140617Srwatson#endif 352285057Smjg return (shm_delete_mapping(p->p_vmspace, shmmap_s)); 3532729Sdfr} 3542729Sdfr 35512866Speter#ifndef _SYS_SYSPROTO_H_ 356280323Skibstruct shmdt_args { 357109831Salfred const void *shmaddr; 3582729Sdfr}; 35912866Speter#endif 3602729Sdfrint 361280323Skibsys_shmdt(struct thread *td, struct shmdt_args *uap) 3622729Sdfr{ 363280323Skib int error; 364280323Skib 365280323Skib SYSVSHM_LOCK(); 366280323Skib error = kern_shmdt_locked(td, uap->shmaddr); 367280323Skib SYSVSHM_UNLOCK(); 368280323Skib return (error); 369280323Skib} 370280323Skib 371280323Skibstatic int 372280323Skibkern_shmat_locked(struct thread *td, int shmid, const void *shmaddr, 373280323Skib int shmflg) 374280323Skib{ 375298585Sjamie struct prison *rpr; 37683366Sjulian struct proc *p = td->td_proc; 377137613Srwatson struct shmid_kernel *shmseg; 378281071Skib struct shmmap_state *shmmap_s; 3792729Sdfr vm_offset_t attach_va; 3802729Sdfr vm_prot_t prot; 3812729Sdfr vm_size_t size; 382280323Skib int error, i, rv; 3832729Sdfr 384280323Skib SYSVSHM_ASSERT_LOCKED(); 385298585Sjamie rpr = shm_find_prison(td->td_ucred); 386298585Sjamie if (rpr == NULL) 38791703Sjhb return (ENOSYS); 388100512Salfred shmmap_s = p->p_vmspace->vm_shm; 3892729Sdfr if (shmmap_s == NULL) { 390189398Skib shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state), 391189398Skib M_SHM, M_WAITOK); 392280323Skib for (i = 0; i < shminfo.shmseg; i++) 393280323Skib shmmap_s[i].shmid = -1; 394280323Skib KASSERT(p->p_vmspace->vm_shm == NULL, ("raced")); 395280323Skib p->p_vmspace->vm_shm = shmmap_s; 3962729Sdfr } 397298585Sjamie shmseg = shm_find_segment(rpr, shmid, true); 398280323Skib if (shmseg == NULL) 399280323Skib return (EINVAL); 400137613Srwatson error = ipcperm(td, &shmseg->u.shm_perm, 401114724Smbr (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); 402280323Skib if (error != 0) 403280323Skib return (error); 404140617Srwatson#ifdef MAC 405172930Srwatson error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg); 406162468Srwatson if (error != 0) 407280323Skib return (error); 408140617Srwatson#endif 4092729Sdfr for (i = 0; i < shminfo.shmseg; i++) { 4102729Sdfr if (shmmap_s->shmid == -1) 4112729Sdfr break; 4122729Sdfr shmmap_s++; 4132729Sdfr } 414280323Skib if (i >= shminfo.shmseg) 415280323Skib return (EMFILE); 416194910Sjhb size = round_page(shmseg->u.shm_segsz); 4172729Sdfr prot = VM_PROT_READ; 418114724Smbr if ((shmflg & SHM_RDONLY) == 0) 4192729Sdfr prot |= VM_PROT_WRITE; 420280323Skib if (shmaddr != NULL) { 421280323Skib if ((shmflg & SHM_RND) != 0) 422298433Spfg attach_va = rounddown2((vm_offset_t)shmaddr, SHMLBA); 423280323Skib else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) 424114724Smbr attach_va = (vm_offset_t)shmaddr; 425280323Skib else 426280323Skib return (EINVAL); 4272729Sdfr } else { 42877104Sdd /* 42977104Sdd * This is just a hint to vm_map_find() about where to 43077104Sdd * put it. 43177104Sdd */ 432130730Stjr attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr + 433285056Smjg lim_max(td, RLIMIT_DATA)); 4342729Sdfr } 43518098Sdyson 436194910Sjhb vm_object_reference(shmseg->object); 437270883Salc rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 0, &attach_va, 438270883Salc size, 0, shmaddr != NULL ? VMFS_NO_SPACE : VMFS_OPTIMAL_SPACE, 439270883Salc prot, prot, MAP_INHERIT_SHARE | MAP_PREFAULT_PARTIAL); 44018098Sdyson if (rv != KERN_SUCCESS) { 441194910Sjhb vm_object_deallocate(shmseg->object); 442280323Skib return (ENOMEM); 44318098Sdyson } 44418231Sdyson 4452729Sdfr shmmap_s->va = attach_va; 446114724Smbr shmmap_s->shmid = shmid; 447137613Srwatson shmseg->u.shm_lpid = p->p_pid; 448137613Srwatson shmseg->u.shm_atime = time_second; 449137613Srwatson shmseg->u.shm_nattch++; 45083366Sjulian td->td_retval[0] = attach_va; 45182607Sdillon return (error); 4522729Sdfr} 4532729Sdfr 454122201Srwatsonint 455280323Skibkern_shmat(struct thread *td, int shmid, const void *shmaddr, int shmflg) 456114724Smbr{ 457280323Skib int error; 458280323Skib 459280323Skib SYSVSHM_LOCK(); 460280323Skib error = kern_shmat_locked(td, shmid, shmaddr, shmflg); 461280323Skib SYSVSHM_UNLOCK(); 462280323Skib return (error); 463114724Smbr} 464114724Smbr 465280323Skib#ifndef _SYS_SYSPROTO_H_ 466280323Skibstruct shmat_args { 467280323Skib int shmid; 468280323Skib const void *shmaddr; 469280323Skib int shmflg; 470280323Skib}; 471280323Skib#endif 4722729Sdfrint 473280323Skibsys_shmat(struct thread *td, struct shmat_args *uap) 4742729Sdfr{ 475280323Skib 476280323Skib return (kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg)); 477280323Skib} 478280323Skib 479280323Skibstatic int 480280323Skibkern_shmctl_locked(struct thread *td, int shmid, int cmd, void *buf, 481280323Skib size_t *bufsz) 482280323Skib{ 483298585Sjamie struct prison *rpr; 484137613Srwatson struct shmid_kernel *shmseg; 485280323Skib struct shmid_ds *shmidp; 486280323Skib struct shm_info shm_info; 487280323Skib int error; 4882729Sdfr 489280323Skib SYSVSHM_ASSERT_LOCKED(); 490280323Skib 491298585Sjamie rpr = shm_find_prison(td->td_ucred); 492298585Sjamie if (rpr == NULL) 49391703Sjhb return (ENOSYS); 494114724Smbr 495114724Smbr switch (cmd) { 496176221Scsjp /* 497176221Scsjp * It is possible that kern_shmctl is being called from the Linux ABI 498176221Scsjp * layer, in which case, we will need to implement IPC_INFO. It should 499176221Scsjp * be noted that other shmctl calls will be funneled through here for 500176221Scsjp * Linix binaries as well. 501176221Scsjp * 502176221Scsjp * NB: The Linux ABI layer will convert this data to structure(s) more 503176221Scsjp * consistent with the Linux ABI. 504176221Scsjp */ 50585623Smr case IPC_INFO: 506114724Smbr memcpy(buf, &shminfo, sizeof(shminfo)); 507114724Smbr if (bufsz) 508114724Smbr *bufsz = sizeof(shminfo); 50985623Smr td->td_retval[0] = shmalloced; 510280323Skib return (0); 51185623Smr case SHM_INFO: { 51285623Smr shm_info.used_ids = shm_nused; 51385623Smr shm_info.shm_rss = 0; /*XXX where to get from ? */ 51485623Smr shm_info.shm_tot = 0; /*XXX where to get from ? */ 51585623Smr shm_info.shm_swp = 0; /*XXX where to get from ? */ 51685623Smr shm_info.swap_attempts = 0; /*XXX where to get from ? */ 51785623Smr shm_info.swap_successes = 0; /*XXX where to get from ? */ 518114724Smbr memcpy(buf, &shm_info, sizeof(shm_info)); 519280323Skib if (bufsz != NULL) 520114724Smbr *bufsz = sizeof(shm_info); 52185623Smr td->td_retval[0] = shmalloced; 522280323Skib return (0); 52385623Smr } 52485623Smr } 525298585Sjamie shmseg = shm_find_segment(rpr, shmid, cmd != SHM_STAT); 526280323Skib if (shmseg == NULL) 527280323Skib return (EINVAL); 528140617Srwatson#ifdef MAC 529172930Srwatson error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd); 530162468Srwatson if (error != 0) 531280323Skib return (error); 532140617Srwatson#endif 533114724Smbr switch (cmd) { 53485623Smr case SHM_STAT: 5352729Sdfr case IPC_STAT: 536298585Sjamie shmidp = (struct shmid_ds *)buf; 537137613Srwatson error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 538280323Skib if (error != 0) 539280323Skib return (error); 540298585Sjamie memcpy(shmidp, &shmseg->u, sizeof(struct shmid_ds)); 541298585Sjamie if (td->td_ucred->cr_prison != shmseg->cred->cr_prison) 542298585Sjamie shmidp->shm_perm.key = IPC_PRIVATE; 543280323Skib if (bufsz != NULL) 544114724Smbr *bufsz = sizeof(struct shmid_ds); 545280323Skib if (cmd == SHM_STAT) { 546280323Skib td->td_retval[0] = IXSEQ_TO_IPCID(shmid, 547280323Skib shmseg->u.shm_perm); 548280323Skib } 5492729Sdfr break; 550280323Skib case IPC_SET: 551280323Skib shmidp = (struct shmid_ds *)buf; 552137613Srwatson error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 553280323Skib if (error != 0) 554280323Skib return (error); 555280323Skib shmseg->u.shm_perm.uid = shmidp->shm_perm.uid; 556280323Skib shmseg->u.shm_perm.gid = shmidp->shm_perm.gid; 557137613Srwatson shmseg->u.shm_perm.mode = 558137613Srwatson (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | 559280323Skib (shmidp->shm_perm.mode & ACCESSPERMS); 560137613Srwatson shmseg->u.shm_ctime = time_second; 5612729Sdfr break; 5622729Sdfr case IPC_RMID: 563137613Srwatson error = ipcperm(td, &shmseg->u.shm_perm, IPC_M); 564280323Skib if (error != 0) 565280323Skib return (error); 566298585Sjamie shm_remove(shmseg, IPCID_TO_IX(shmid)); 5672729Sdfr break; 5682729Sdfr#if 0 5692729Sdfr case SHM_LOCK: 5702729Sdfr case SHM_UNLOCK: 5712729Sdfr#endif 5722729Sdfr default: 57382607Sdillon error = EINVAL; 57482607Sdillon break; 5752729Sdfr } 57682607Sdillon return (error); 5772729Sdfr} 5782729Sdfr 579280323Skibint 580280323Skibkern_shmctl(struct thread *td, int shmid, int cmd, void *buf, size_t *bufsz) 581280323Skib{ 582280323Skib int error; 583280323Skib 584280323Skib SYSVSHM_LOCK(); 585280323Skib error = kern_shmctl_locked(td, shmid, cmd, buf, bufsz); 586280323Skib SYSVSHM_UNLOCK(); 587280323Skib return (error); 588280323Skib} 589280323Skib 590280323Skib 591194832Sjhb#ifndef _SYS_SYSPROTO_H_ 592194832Sjhbstruct shmctl_args { 593194832Sjhb int shmid; 594194832Sjhb int cmd; 595194832Sjhb struct shmid_ds *buf; 596194832Sjhb}; 597194832Sjhb#endif 598114724Smbrint 599280323Skibsys_shmctl(struct thread *td, struct shmctl_args *uap) 600114724Smbr{ 601285057Smjg int error; 602114724Smbr struct shmid_ds buf; 603114724Smbr size_t bufsz; 604285057Smjg 605176221Scsjp /* 606176221Scsjp * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 607176221Scsjp * Linux binaries. If we see the call come through the FreeBSD ABI, 608176221Scsjp * return an error back to the user since we do not to support this. 609176221Scsjp */ 610176221Scsjp if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 611176221Scsjp uap->cmd == SHM_STAT) 612176221Scsjp return (EINVAL); 613176221Scsjp 614114724Smbr /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 615114724Smbr if (uap->cmd == IPC_SET) { 616114724Smbr if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds)))) 617114724Smbr goto done; 618114724Smbr } 619285057Smjg 620122088Sfjoe error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 621114724Smbr if (error) 622114724Smbr goto done; 623285057Smjg 624114724Smbr /* Cases in which we need to copyout */ 625114724Smbr switch (uap->cmd) { 626114724Smbr case IPC_STAT: 627114724Smbr error = copyout(&buf, uap->buf, bufsz); 628114724Smbr break; 629114724Smbr } 630114724Smbr 631114724Smbrdone: 632114724Smbr if (error) { 633114724Smbr /* Invalidate the return value */ 634114724Smbr td->td_retval[0] = -1; 635114724Smbr } 636114724Smbr return (error); 637114724Smbr} 638114724Smbr 639114724Smbr 6402729Sdfrstatic int 641280323Skibshmget_existing(struct thread *td, struct shmget_args *uap, int mode, 642280323Skib int segnum) 6432729Sdfr{ 644137613Srwatson struct shmid_kernel *shmseg; 645280325Scognet#ifdef MAC 6462729Sdfr int error; 647280325Scognet#endif 6482729Sdfr 649280323Skib SYSVSHM_ASSERT_LOCKED(); 650280323Skib KASSERT(segnum >= 0 && segnum < shmalloced, 651280323Skib ("segnum %d shmalloced %d", segnum, shmalloced)); 6522729Sdfr shmseg = &shmsegs[segnum]; 65348039Salc if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) 654101891Salfred return (EEXIST); 655140617Srwatson#ifdef MAC 656172930Srwatson error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg); 657162468Srwatson if (error != 0) 658150937Srwatson return (error); 659140617Srwatson#endif 660194910Sjhb if (uap->size != 0 && uap->size > shmseg->u.shm_segsz) 661101891Salfred return (EINVAL); 662137613Srwatson td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 663101891Salfred return (0); 6642729Sdfr} 6652729Sdfr 6662729Sdfrstatic int 667280323Skibshmget_allocate_segment(struct thread *td, struct shmget_args *uap, int mode) 6682729Sdfr{ 66991406Sjhb struct ucred *cred = td->td_ucred; 670137613Srwatson struct shmid_kernel *shmseg; 671131857Salc vm_object_t shm_object; 672280323Skib int i, segnum; 673280323Skib size_t size; 6748876Srgrimes 675280323Skib SYSVSHM_ASSERT_LOCKED(); 67679224Sdillon 6772729Sdfr if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) 678101891Salfred return (EINVAL); 67977104Sdd if (shm_nused >= shminfo.shmmni) /* Any shmids left? */ 680101891Salfred return (ENOSPC); 68115636Sjoerg size = round_page(uap->size); 6822729Sdfr if (shm_committed + btoc(size) > shminfo.shmall) 683101891Salfred return (ENOMEM); 6842729Sdfr if (shm_last_free < 0) { 68577104Sdd shmrealloc(); /* Maybe expand the shmsegs[] array. */ 68658820Speter for (i = 0; i < shmalloced; i++) 687137613Srwatson if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) 6882729Sdfr break; 68958820Speter if (i == shmalloced) 690101891Salfred return (ENOSPC); 6912729Sdfr segnum = i; 6922729Sdfr } else { 6932729Sdfr segnum = shm_last_free; 6942729Sdfr shm_last_free = -1; 6952729Sdfr } 696280323Skib KASSERT(segnum >= 0 && segnum < shmalloced, 697280323Skib ("segnum %d shmalloced %d", segnum, shmalloced)); 6982729Sdfr shmseg = &shmsegs[segnum]; 699223825Strasz#ifdef RACCT 700282213Strasz if (racct_enable) { 701282213Strasz PROC_LOCK(td->td_proc); 702282213Strasz if (racct_add(td->td_proc, RACCT_NSHM, 1)) { 703282213Strasz PROC_UNLOCK(td->td_proc); 704282213Strasz return (ENOSPC); 705282213Strasz } 706282213Strasz if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) { 707282213Strasz racct_sub(td->td_proc, RACCT_NSHM, 1); 708282213Strasz PROC_UNLOCK(td->td_proc); 709282213Strasz return (ENOMEM); 710282213Strasz } 711220398Strasz PROC_UNLOCK(td->td_proc); 712220398Strasz } 713223825Strasz#endif 714280323Skib 7152729Sdfr /* 71618199Sdyson * We make sure that we have allocated a pager before we need 71718199Sdyson * to. 71818199Sdyson */ 719194766Skib shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP, 720194766Skib 0, size, VM_PROT_DEFAULT, 0, cred); 721220398Strasz if (shm_object == NULL) { 722223825Strasz#ifdef RACCT 723282213Strasz if (racct_enable) { 724282213Strasz PROC_LOCK(td->td_proc); 725282213Strasz racct_sub(td->td_proc, RACCT_NSHM, 1); 726282213Strasz racct_sub(td->td_proc, RACCT_SHMSIZE, size); 727282213Strasz PROC_UNLOCK(td->td_proc); 728282213Strasz } 729223825Strasz#endif 730194766Skib return (ENOMEM); 731220398Strasz } 732278697Salc shm_object->pg_color = 0; 733248084Sattilio VM_OBJECT_WLOCK(shm_object); 734131857Salc vm_object_clear_flag(shm_object, OBJ_ONEMAPPING); 735278697Salc vm_object_set_flag(shm_object, OBJ_COLORED | OBJ_NOSPLIT); 736248084Sattilio VM_OBJECT_WUNLOCK(shm_object); 73735669Sdyson 738194910Sjhb shmseg->object = shm_object; 739137613Srwatson shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid; 740137613Srwatson shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid; 741280323Skib shmseg->u.shm_perm.mode = (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; 742280323Skib shmseg->u.shm_perm.key = uap->key; 743280323Skib shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff; 744220399Strasz shmseg->cred = crhold(cred); 745137613Srwatson shmseg->u.shm_segsz = uap->size; 746137613Srwatson shmseg->u.shm_cpid = td->td_proc->p_pid; 747137613Srwatson shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; 748137613Srwatson shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; 749140617Srwatson#ifdef MAC 750172930Srwatson mac_sysvshm_create(cred, shmseg); 751140617Srwatson#endif 752137613Srwatson shmseg->u.shm_ctime = time_second; 7532729Sdfr shm_committed += btoc(size); 7542729Sdfr shm_nused++; 755280323Skib td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); 756280323Skib 757101891Salfred return (0); 7582729Sdfr} 7592729Sdfr 760194832Sjhb#ifndef _SYS_SYSPROTO_H_ 761194832Sjhbstruct shmget_args { 762194832Sjhb key_t key; 763194832Sjhb size_t size; 764194832Sjhb int shmflg; 765194832Sjhb}; 766194832Sjhb#endif 7672729Sdfrint 768280323Skibsys_shmget(struct thread *td, struct shmget_args *uap) 7692729Sdfr{ 77082607Sdillon int segnum, mode; 77182607Sdillon int error; 7722729Sdfr 773298585Sjamie if (shm_find_prison(td->td_ucred) == NULL) 77491703Sjhb return (ENOSYS); 7752729Sdfr mode = uap->shmflg & ACCESSPERMS; 776280323Skib SYSVSHM_LOCK(); 777280323Skib if (uap->key == IPC_PRIVATE) { 778280323Skib error = shmget_allocate_segment(td, uap, mode); 779280323Skib } else { 780298585Sjamie segnum = shm_find_segment_by_key(td->td_ucred->cr_prison, 781298585Sjamie uap->key); 782280323Skib if (segnum >= 0) 78383366Sjulian error = shmget_existing(td, uap, mode, segnum); 784280323Skib else if ((uap->shmflg & IPC_CREAT) == 0) 78582607Sdillon error = ENOENT; 786280323Skib else 787280323Skib error = shmget_allocate_segment(td, uap, mode); 7882729Sdfr } 789280323Skib SYSVSHM_UNLOCK(); 79082607Sdillon return (error); 7912729Sdfr} 7922729Sdfr 79369449Salfredstatic void 794280323Skibshmfork_myhook(struct proc *p1, struct proc *p2) 7952729Sdfr{ 7962729Sdfr struct shmmap_state *shmmap_s; 7972729Sdfr size_t size; 7982729Sdfr int i; 7992729Sdfr 800280323Skib SYSVSHM_LOCK(); 8012729Sdfr size = shminfo.shmseg * sizeof(struct shmmap_state); 802111119Simp shmmap_s = malloc(size, M_SHM, M_WAITOK); 803100511Salfred bcopy(p1->p_vmspace->vm_shm, shmmap_s, size); 804100511Salfred p2->p_vmspace->vm_shm = shmmap_s; 805280323Skib for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) { 806280323Skib if (shmmap_s->shmid != -1) { 807280323Skib KASSERT(IPCID_TO_IX(shmmap_s->shmid) >= 0 && 808280323Skib IPCID_TO_IX(shmmap_s->shmid) < shmalloced, 809280323Skib ("segnum %d shmalloced %d", 810280323Skib IPCID_TO_IX(shmmap_s->shmid), shmalloced)); 811137613Srwatson shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; 812280323Skib } 813280323Skib } 814280323Skib SYSVSHM_UNLOCK(); 8152729Sdfr} 8162729Sdfr 81769449Salfredstatic void 818109205Sdillonshmexit_myhook(struct vmspace *vm) 8192729Sdfr{ 820109205Sdillon struct shmmap_state *base, *shm; 8212729Sdfr int i; 8222729Sdfr 823280323Skib base = vm->vm_shm; 824280323Skib if (base != NULL) { 825109205Sdillon vm->vm_shm = NULL; 826280323Skib SYSVSHM_LOCK(); 827109205Sdillon for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) { 828109205Sdillon if (shm->shmid != -1) 829109205Sdillon shm_delete_mapping(vm, shm); 830109205Sdillon } 831280323Skib SYSVSHM_UNLOCK(); 832109205Sdillon free(base, M_SHM); 833109205Sdillon } 8342729Sdfr} 8352729Sdfr 83658820Speterstatic void 83758820Spetershmrealloc(void) 83858820Speter{ 839280323Skib struct shmid_kernel *newsegs; 84058820Speter int i; 84158820Speter 842280323Skib SYSVSHM_ASSERT_LOCKED(); 843280323Skib 84458820Speter if (shmalloced >= shminfo.shmmni) 84558820Speter return; 84658820Speter 847111119Simp newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK); 84858820Speter for (i = 0; i < shmalloced; i++) 84958820Speter bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0])); 85058820Speter for (; i < shminfo.shmmni; i++) { 851285055Smjg newsegs[i].u.shm_perm.mode = SHMSEG_FREE; 852285055Smjg newsegs[i].u.shm_perm.seq = 0; 853140617Srwatson#ifdef MAC 854285055Smjg mac_sysvshm_init(&newsegs[i]); 855140617Srwatson#endif 85658820Speter } 85758820Speter free(shmsegs, M_SHM); 85858820Speter shmsegs = newsegs; 85958820Speter shmalloced = shminfo.shmmni; 86058820Speter} 86158820Speter 862205323Skibstatic struct syscall_helper_data shm_syscalls[] = { 863205323Skib SYSCALL_INIT_HELPER(shmat), 864205323Skib SYSCALL_INIT_HELPER(shmctl), 865205323Skib SYSCALL_INIT_HELPER(shmdt), 866205323Skib SYSCALL_INIT_HELPER(shmget), 867205323Skib#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 868205323Skib defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 869225617Skmacy SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl), 870205323Skib#endif 871205323Skib#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 872205323Skib SYSCALL_INIT_HELPER(shmsys), 873205323Skib#endif 874205323Skib SYSCALL_INIT_LAST 875205323Skib}; 876205323Skib 877205323Skib#ifdef COMPAT_FREEBSD32 878205323Skib#include <compat/freebsd32/freebsd32.h> 879205323Skib#include <compat/freebsd32/freebsd32_ipc.h> 880205323Skib#include <compat/freebsd32/freebsd32_proto.h> 881205323Skib#include <compat/freebsd32/freebsd32_signal.h> 882205323Skib#include <compat/freebsd32/freebsd32_syscall.h> 883205323Skib#include <compat/freebsd32/freebsd32_util.h> 884205323Skib 885205323Skibstatic struct syscall_helper_data shm32_syscalls[] = { 886225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(shmat), 887225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(shmdt), 888225617Skmacy SYSCALL32_INIT_HELPER_COMPAT(shmget), 889205323Skib SYSCALL32_INIT_HELPER(freebsd32_shmsys), 890205323Skib SYSCALL32_INIT_HELPER(freebsd32_shmctl), 891205323Skib#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 892205323Skib defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 893205323Skib SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl), 894205323Skib#endif 895205323Skib SYSCALL_INIT_LAST 896205323Skib}; 897205323Skib#endif 898205323Skib 899205323Skibstatic int 900280323Skibshminit(void) 9012729Sdfr{ 902298585Sjamie struct prison *pr; 903298661Scem void **rsv; 904205323Skib int i, error; 905298585Sjamie osd_method_t methods[PR_MAXMETHOD] = { 906298585Sjamie [PR_METHOD_CHECK] = shm_prison_check, 907298585Sjamie [PR_METHOD_SET] = shm_prison_set, 908298585Sjamie [PR_METHOD_GET] = shm_prison_get, 909298585Sjamie [PR_METHOD_REMOVE] = shm_prison_remove, 910298585Sjamie }; 91158820Speter 912198449Sru#ifndef BURN_BRIDGES 913198449Sru if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0) 914198449Sru printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n"); 915198449Sru#endif 916267992Shselasky if (shminfo.shmmax == SHMMAX) { 917231195Spjd /* Initialize shmmax dealing with possible overflow. */ 918267992Shselasky for (i = PAGE_SIZE; i != 0; i--) { 919231195Spjd shminfo.shmmax = shminfo.shmall * i; 920267992Shselasky if ((shminfo.shmmax / shminfo.shmall) == (u_long)i) 921231195Spjd break; 922231195Spjd } 923110982Salfred } 92458820Speter shmalloced = shminfo.shmmni; 925111119Simp shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK); 92658820Speter for (i = 0; i < shmalloced; i++) { 927137613Srwatson shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; 928137613Srwatson shmsegs[i].u.shm_perm.seq = 0; 929140617Srwatson#ifdef MAC 930172930Srwatson mac_sysvshm_init(&shmsegs[i]); 931140617Srwatson#endif 9322729Sdfr } 9332729Sdfr shm_last_free = 0; 9342729Sdfr shm_nused = 0; 9352729Sdfr shm_committed = 0; 936280323Skib sx_init(&sysvshmsx, "sysvshmsx"); 93769449Salfred shmexit_hook = &shmexit_myhook; 93869449Salfred shmfork_hook = &shmfork_myhook; 939205323Skib 940298585Sjamie /* Set current prisons according to their allow.sysvipc. */ 941298585Sjamie shm_prison_slot = osd_jail_register(NULL, methods); 942298585Sjamie rsv = osd_reserve(shm_prison_slot); 943298585Sjamie prison_lock(&prison0); 944298585Sjamie (void)osd_jail_set_reserved(&prison0, shm_prison_slot, rsv, &prison0); 945298585Sjamie prison_unlock(&prison0); 946298585Sjamie rsv = NULL; 947298585Sjamie sx_slock(&allprison_lock); 948298585Sjamie TAILQ_FOREACH(pr, &allprison, pr_list) { 949298585Sjamie if (rsv == NULL) 950298585Sjamie rsv = osd_reserve(shm_prison_slot); 951298585Sjamie prison_lock(pr); 952298585Sjamie if ((pr->pr_allow & PR_ALLOW_SYSVIPC) && pr->pr_ref > 0) { 953298585Sjamie (void)osd_jail_set_reserved(pr, shm_prison_slot, rsv, 954298585Sjamie &prison0); 955298585Sjamie rsv = NULL; 956298585Sjamie } 957298585Sjamie prison_unlock(pr); 958298585Sjamie } 959298585Sjamie if (rsv != NULL) 960298585Sjamie osd_free_reserved(rsv); 961298585Sjamie sx_sunlock(&allprison_lock); 962298585Sjamie 963273707Smjg error = syscall_helper_register(shm_syscalls, SY_THR_STATIC_KLD); 964205323Skib if (error != 0) 965205323Skib return (error); 966205323Skib#ifdef COMPAT_FREEBSD32 967273707Smjg error = syscall32_helper_register(shm32_syscalls, SY_THR_STATIC_KLD); 968205323Skib if (error != 0) 969205323Skib return (error); 970205323Skib#endif 971205323Skib return (0); 9722729Sdfr} 97369449Salfred 97469449Salfredstatic int 975280323Skibshmunload(void) 97669449Salfred{ 977285057Smjg int i; 97869449Salfred 97969449Salfred if (shm_nused > 0) 98069449Salfred return (EBUSY); 98169449Salfred 982205323Skib#ifdef COMPAT_FREEBSD32 983205323Skib syscall32_helper_unregister(shm32_syscalls); 984205323Skib#endif 985205323Skib syscall_helper_unregister(shm_syscalls); 986298585Sjamie if (shm_prison_slot != 0) 987298585Sjamie osd_jail_deregister(shm_prison_slot); 988205323Skib 989209580Skib for (i = 0; i < shmalloced; i++) { 990140617Srwatson#ifdef MAC 991172930Srwatson mac_sysvshm_destroy(&shmsegs[i]); 992140617Srwatson#endif 993209580Skib /* 994209580Skib * Objects might be still mapped into the processes 995209580Skib * address spaces. Actual free would happen on the 996209580Skib * last mapping destruction. 997209580Skib */ 998209580Skib if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE) 999209580Skib vm_object_deallocate(shmsegs[i].object); 1000209580Skib } 100169449Salfred free(shmsegs, M_SHM); 100269449Salfred shmexit_hook = NULL; 100369449Salfred shmfork_hook = NULL; 1004280323Skib sx_destroy(&sysvshmsx); 100569449Salfred return (0); 100669449Salfred} 100769449Salfred 100869449Salfredstatic int 100977461Sddsysctl_shmsegs(SYSCTL_HANDLER_ARGS) 101077461Sdd{ 1011298656Sjamie struct shmid_kernel tshmseg; 1012298656Sjamie struct prison *pr, *rpr; 1013298585Sjamie int error, i; 101477461Sdd 1015280323Skib SYSVSHM_LOCK(); 1016298656Sjamie pr = req->td->td_ucred->cr_prison; 1017298585Sjamie rpr = shm_find_prison(req->td->td_ucred); 1018298656Sjamie error = 0; 1019298585Sjamie for (i = 0; i < shmalloced; i++) { 1020298656Sjamie if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 || 1021298585Sjamie rpr == NULL || shm_prison_cansee(rpr, &shmsegs[i]) != 0) { 1022298656Sjamie bzero(&tshmseg, sizeof(tshmseg)); 1023298656Sjamie tshmseg.u.shm_perm.mode = SHMSEG_FREE; 1024298656Sjamie } else { 1025298656Sjamie tshmseg = shmsegs[i]; 1026298656Sjamie if (tshmseg.cred->cr_prison != pr) 1027298656Sjamie tshmseg.u.shm_perm.key = IPC_PRIVATE; 1028298585Sjamie } 1029298656Sjamie error = SYSCTL_OUT(req, &tshmseg, sizeof(tshmseg)); 1030298656Sjamie if (error != 0) 1031298656Sjamie break; 1032298585Sjamie } 1033280323Skib SYSVSHM_UNLOCK(); 1034280323Skib return (error); 103577461Sdd} 103677461Sdd 1037298585Sjamiestatic int 1038298585Sjamieshm_prison_check(void *obj, void *data) 1039298585Sjamie{ 1040298585Sjamie struct prison *pr = obj; 1041298585Sjamie struct prison *prpr; 1042298585Sjamie struct vfsoptlist *opts = data; 1043298585Sjamie int error, jsys; 1044298585Sjamie 1045298585Sjamie /* 1046298585Sjamie * sysvshm is a jailsys integer. 1047298585Sjamie * It must be "disable" if the parent jail is disabled. 1048298585Sjamie */ 1049298585Sjamie error = vfs_copyopt(opts, "sysvshm", &jsys, sizeof(jsys)); 1050298585Sjamie if (error != ENOENT) { 1051298585Sjamie if (error != 0) 1052298585Sjamie return (error); 1053298585Sjamie switch (jsys) { 1054298585Sjamie case JAIL_SYS_DISABLE: 1055298585Sjamie break; 1056298585Sjamie case JAIL_SYS_NEW: 1057298585Sjamie case JAIL_SYS_INHERIT: 1058298585Sjamie prison_lock(pr->pr_parent); 1059298585Sjamie prpr = osd_jail_get(pr->pr_parent, shm_prison_slot); 1060298585Sjamie prison_unlock(pr->pr_parent); 1061298585Sjamie if (prpr == NULL) 1062298585Sjamie return (EPERM); 1063298585Sjamie break; 1064298585Sjamie default: 1065298585Sjamie return (EINVAL); 1066298585Sjamie } 1067298585Sjamie } 1068298585Sjamie 1069298585Sjamie return (0); 1070298585Sjamie} 1071298585Sjamie 1072298585Sjamiestatic int 1073298585Sjamieshm_prison_set(void *obj, void *data) 1074298585Sjamie{ 1075298585Sjamie struct prison *pr = obj; 1076298585Sjamie struct prison *tpr, *orpr, *nrpr, *trpr; 1077298585Sjamie struct vfsoptlist *opts = data; 1078298585Sjamie void *rsv; 1079298585Sjamie int jsys, descend; 1080298585Sjamie 1081298585Sjamie /* 1082298585Sjamie * sysvshm controls which jail is the root of the associated segments 1083298585Sjamie * (this jail or same as the parent), or if the feature is available 1084298585Sjamie * at all. 1085298585Sjamie */ 1086298585Sjamie if (vfs_copyopt(opts, "sysvshm", &jsys, sizeof(jsys)) == ENOENT) 1087298585Sjamie jsys = vfs_flagopt(opts, "allow.sysvipc", NULL, 0) 1088298585Sjamie ? JAIL_SYS_INHERIT 1089298585Sjamie : vfs_flagopt(opts, "allow.nosysvipc", NULL, 0) 1090298585Sjamie ? JAIL_SYS_DISABLE 1091298585Sjamie : -1; 1092298585Sjamie if (jsys == JAIL_SYS_DISABLE) { 1093298585Sjamie prison_lock(pr); 1094298585Sjamie orpr = osd_jail_get(pr, shm_prison_slot); 1095298585Sjamie if (orpr != NULL) 1096298585Sjamie osd_jail_del(pr, shm_prison_slot); 1097298585Sjamie prison_unlock(pr); 1098298585Sjamie if (orpr != NULL) { 1099298585Sjamie if (orpr == pr) 1100298585Sjamie shm_prison_cleanup(pr); 1101298585Sjamie /* Disable all child jails as well. */ 1102298585Sjamie FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1103298585Sjamie prison_lock(tpr); 1104298585Sjamie trpr = osd_jail_get(tpr, shm_prison_slot); 1105298585Sjamie if (trpr != NULL) { 1106298585Sjamie osd_jail_del(tpr, shm_prison_slot); 1107298585Sjamie prison_unlock(tpr); 1108298585Sjamie if (trpr == tpr) 1109298585Sjamie shm_prison_cleanup(tpr); 1110298585Sjamie } else { 1111298585Sjamie prison_unlock(tpr); 1112298585Sjamie descend = 0; 1113298585Sjamie } 1114298585Sjamie } 1115298585Sjamie } 1116298585Sjamie } else if (jsys != -1) { 1117298585Sjamie if (jsys == JAIL_SYS_NEW) 1118298585Sjamie nrpr = pr; 1119298585Sjamie else { 1120298585Sjamie prison_lock(pr->pr_parent); 1121298585Sjamie nrpr = osd_jail_get(pr->pr_parent, shm_prison_slot); 1122298585Sjamie prison_unlock(pr->pr_parent); 1123298585Sjamie } 1124298585Sjamie rsv = osd_reserve(shm_prison_slot); 1125298585Sjamie prison_lock(pr); 1126298585Sjamie orpr = osd_jail_get(pr, shm_prison_slot); 1127298585Sjamie if (orpr != nrpr) 1128298585Sjamie (void)osd_jail_set_reserved(pr, shm_prison_slot, rsv, 1129298585Sjamie nrpr); 1130298585Sjamie else 1131298585Sjamie osd_free_reserved(rsv); 1132298585Sjamie prison_unlock(pr); 1133298585Sjamie if (orpr != nrpr) { 1134298585Sjamie if (orpr == pr) 1135298585Sjamie shm_prison_cleanup(pr); 1136298585Sjamie if (orpr != NULL) { 1137298585Sjamie /* Change child jails matching the old root, */ 1138298585Sjamie FOREACH_PRISON_DESCENDANT(pr, tpr, descend) { 1139298585Sjamie prison_lock(tpr); 1140298585Sjamie trpr = osd_jail_get(tpr, 1141298585Sjamie shm_prison_slot); 1142298585Sjamie if (trpr == orpr) { 1143298585Sjamie (void)osd_jail_set(tpr, 1144298585Sjamie shm_prison_slot, nrpr); 1145298585Sjamie prison_unlock(tpr); 1146298585Sjamie if (trpr == tpr) 1147298585Sjamie shm_prison_cleanup(tpr); 1148298585Sjamie } else { 1149298585Sjamie prison_unlock(tpr); 1150298585Sjamie descend = 0; 1151298585Sjamie } 1152298585Sjamie } 1153298585Sjamie } 1154298585Sjamie } 1155298585Sjamie } 1156298585Sjamie 1157298585Sjamie return (0); 1158298585Sjamie} 1159298585Sjamie 1160298585Sjamiestatic int 1161298585Sjamieshm_prison_get(void *obj, void *data) 1162298585Sjamie{ 1163298585Sjamie struct prison *pr = obj; 1164298585Sjamie struct prison *rpr; 1165298585Sjamie struct vfsoptlist *opts = data; 1166298585Sjamie int error, jsys; 1167298585Sjamie 1168298585Sjamie /* Set sysvshm based on the jail's root prison. */ 1169298585Sjamie prison_lock(pr); 1170298585Sjamie rpr = osd_jail_get(pr, shm_prison_slot); 1171298585Sjamie prison_unlock(pr); 1172298585Sjamie jsys = rpr == NULL ? JAIL_SYS_DISABLE 1173298585Sjamie : rpr == pr ? JAIL_SYS_NEW : JAIL_SYS_INHERIT; 1174298585Sjamie error = vfs_setopt(opts, "sysvshm", &jsys, sizeof(jsys)); 1175298585Sjamie if (error == ENOENT) 1176298585Sjamie error = 0; 1177298585Sjamie return (error); 1178298585Sjamie} 1179298585Sjamie 1180298585Sjamiestatic int 1181298585Sjamieshm_prison_remove(void *obj, void *data __unused) 1182298585Sjamie{ 1183298585Sjamie struct prison *pr = obj; 1184298585Sjamie struct prison *rpr; 1185298585Sjamie 1186298585Sjamie SYSVSHM_LOCK(); 1187298585Sjamie prison_lock(pr); 1188298585Sjamie rpr = osd_jail_get(pr, shm_prison_slot); 1189298585Sjamie prison_unlock(pr); 1190298585Sjamie if (rpr == pr) 1191298585Sjamie shm_prison_cleanup(pr); 1192298585Sjamie SYSVSHM_UNLOCK(); 1193298585Sjamie return (0); 1194298585Sjamie} 1195298585Sjamie 1196298585Sjamiestatic void 1197298585Sjamieshm_prison_cleanup(struct prison *pr) 1198298585Sjamie{ 1199298585Sjamie struct shmid_kernel *shmseg; 1200298585Sjamie int i; 1201298585Sjamie 1202298585Sjamie /* Remove any segments that belong to this jail. */ 1203298585Sjamie for (i = 0; i < shmalloced; i++) { 1204298585Sjamie shmseg = &shmsegs[i]; 1205298585Sjamie if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) && 1206298585Sjamie shmseg->cred != NULL && shmseg->cred->cr_prison == pr) { 1207298585Sjamie shm_remove(shmseg, i); 1208298585Sjamie } 1209298585Sjamie } 1210298585Sjamie} 1211298585Sjamie 1212298585SjamieSYSCTL_JAIL_PARAM_SYS_NODE(sysvshm, CTLFLAG_RW, "SYSV shared memory"); 1213298585Sjamie 1214194894Sjhb#if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43)) 1215194894Sjhbstruct oshmid_ds { 1216194894Sjhb struct ipc_perm_old shm_perm; /* operation perms */ 1217194894Sjhb int shm_segsz; /* size of segment (bytes) */ 1218194894Sjhb u_short shm_cpid; /* pid, creator */ 1219194894Sjhb u_short shm_lpid; /* pid, last operation */ 1220194894Sjhb short shm_nattch; /* no. of current attaches */ 1221194894Sjhb time_t shm_atime; /* last attach time */ 1222194894Sjhb time_t shm_dtime; /* last detach time */ 1223194894Sjhb time_t shm_ctime; /* last change time */ 1224194894Sjhb void *shm_handle; /* internal handle for shm segment */ 1225194894Sjhb}; 1226194894Sjhb 1227194894Sjhbstruct oshmctl_args { 1228194894Sjhb int shmid; 1229194894Sjhb int cmd; 1230194894Sjhb struct oshmid_ds *ubuf; 1231194894Sjhb}; 1232194894Sjhb 123377461Sddstatic int 1234194959Sjhboshmctl(struct thread *td, struct oshmctl_args *uap) 1235194894Sjhb{ 1236194894Sjhb#ifdef COMPAT_43 1237194894Sjhb int error = 0; 1238298585Sjamie struct prison *rpr; 1239194894Sjhb struct shmid_kernel *shmseg; 1240194894Sjhb struct oshmid_ds outbuf; 1241194894Sjhb 1242298585Sjamie rpr = shm_find_prison(td->td_ucred); 1243298585Sjamie if (rpr == NULL) 1244194894Sjhb return (ENOSYS); 1245282084Skib if (uap->cmd != IPC_STAT) { 1246282084Skib return (freebsd7_shmctl(td, 1247282084Skib (struct freebsd7_shmctl_args *)uap)); 1248282084Skib } 1249280323Skib SYSVSHM_LOCK(); 1250298585Sjamie shmseg = shm_find_segment(rpr, uap->shmid, true); 1251194894Sjhb if (shmseg == NULL) { 1252280323Skib SYSVSHM_UNLOCK(); 1253281094Skib return (EINVAL); 1254194894Sjhb } 1255282084Skib error = ipcperm(td, &shmseg->u.shm_perm, IPC_R); 1256282084Skib if (error != 0) { 1257282084Skib SYSVSHM_UNLOCK(); 1258282084Skib return (error); 1259282084Skib } 1260194894Sjhb#ifdef MAC 1261282084Skib error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd); 1262282084Skib if (error != 0) { 1263282084Skib SYSVSHM_UNLOCK(); 1264282084Skib return (error); 1265282084Skib } 1266194894Sjhb#endif 1267282084Skib ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm); 1268282084Skib outbuf.shm_segsz = shmseg->u.shm_segsz; 1269282084Skib outbuf.shm_cpid = shmseg->u.shm_cpid; 1270282084Skib outbuf.shm_lpid = shmseg->u.shm_lpid; 1271282084Skib outbuf.shm_nattch = shmseg->u.shm_nattch; 1272282084Skib outbuf.shm_atime = shmseg->u.shm_atime; 1273282084Skib outbuf.shm_dtime = shmseg->u.shm_dtime; 1274282084Skib outbuf.shm_ctime = shmseg->u.shm_ctime; 1275282084Skib outbuf.shm_handle = shmseg->object; 1276280323Skib SYSVSHM_UNLOCK(); 1277285057Smjg return (copyout(&outbuf, uap->ubuf, sizeof(outbuf))); 1278194894Sjhb#else 1279194894Sjhb return (EINVAL); 1280194894Sjhb#endif 1281194894Sjhb} 1282194894Sjhb 1283194894Sjhb/* XXX casting to (sy_call_t *) is bogus, as usual. */ 1284194894Sjhbstatic sy_call_t *shmcalls[] = { 1285225617Skmacy (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl, 1286225617Skmacy (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget, 1287194910Sjhb (sy_call_t *)freebsd7_shmctl 1288194894Sjhb}; 1289194894Sjhb 1290280323Skib#ifndef _SYS_SYSPROTO_H_ 1291280323Skib/* XXX actually varargs. */ 1292280323Skibstruct shmsys_args { 1293280323Skib int which; 1294280323Skib int a2; 1295280323Skib int a3; 1296280323Skib int a4; 1297280323Skib}; 1298280323Skib#endif 1299194894Sjhbint 1300280323Skibsys_shmsys(struct thread *td, struct shmsys_args *uap) 1301194894Sjhb{ 1302194894Sjhb 1303280323Skib if (uap->which < 0 || uap->which >= nitems(shmcalls)) 1304194894Sjhb return (EINVAL); 1305285057Smjg return ((*shmcalls[uap->which])(td, &uap->a2)); 1306194894Sjhb} 1307194894Sjhb 1308194894Sjhb#endif /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */ 1309194894Sjhb 1310205323Skib#ifdef COMPAT_FREEBSD32 1311205323Skib 1312205323Skibint 1313205323Skibfreebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap) 1314205323Skib{ 1315205323Skib 1316194910Sjhb#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1317194910Sjhb defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1318205323Skib switch (uap->which) { 1319205323Skib case 0: { /* shmat */ 1320205323Skib struct shmat_args ap; 1321194910Sjhb 1322205323Skib ap.shmid = uap->a2; 1323205323Skib ap.shmaddr = PTRIN(uap->a3); 1324205323Skib ap.shmflg = uap->a4; 1325205323Skib return (sysent[SYS_shmat].sy_call(td, &ap)); 1326205323Skib } 1327205323Skib case 2: { /* shmdt */ 1328205323Skib struct shmdt_args ap; 1329205323Skib 1330205323Skib ap.shmaddr = PTRIN(uap->a2); 1331205323Skib return (sysent[SYS_shmdt].sy_call(td, &ap)); 1332205323Skib } 1333205323Skib case 3: { /* shmget */ 1334205323Skib struct shmget_args ap; 1335205323Skib 1336205323Skib ap.key = uap->a2; 1337205323Skib ap.size = uap->a3; 1338205323Skib ap.shmflg = uap->a4; 1339205323Skib return (sysent[SYS_shmget].sy_call(td, &ap)); 1340205323Skib } 1341205323Skib case 4: { /* shmctl */ 1342205323Skib struct freebsd7_freebsd32_shmctl_args ap; 1343205323Skib 1344205323Skib ap.shmid = uap->a2; 1345205323Skib ap.cmd = uap->a3; 1346205323Skib ap.buf = PTRIN(uap->a4); 1347205323Skib return (freebsd7_freebsd32_shmctl(td, &ap)); 1348205323Skib } 1349205323Skib case 1: /* oshmctl */ 1350205323Skib default: 1351205323Skib return (EINVAL); 1352205323Skib } 1353205323Skib#else 1354205323Skib return (nosys(td, NULL)); 1355205323Skib#endif 1356205323Skib} 1357205323Skib 1358205323Skib#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1359205323Skib defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1360205323Skibint 1361205323Skibfreebsd7_freebsd32_shmctl(struct thread *td, 1362205323Skib struct freebsd7_freebsd32_shmctl_args *uap) 1363205323Skib{ 1364285057Smjg int error; 1365205323Skib union { 1366205323Skib struct shmid_ds shmid_ds; 1367205323Skib struct shm_info shm_info; 1368205323Skib struct shminfo shminfo; 1369205323Skib } u; 1370205323Skib union { 1371205323Skib struct shmid_ds32_old shmid_ds32; 1372205323Skib struct shm_info32 shm_info32; 1373205323Skib struct shminfo32 shminfo32; 1374205323Skib } u32; 1375205323Skib size_t sz; 1376205323Skib 1377205323Skib if (uap->cmd == IPC_SET) { 1378205323Skib if ((error = copyin(uap->buf, &u32.shmid_ds32, 1379205323Skib sizeof(u32.shmid_ds32)))) 1380205323Skib goto done; 1381205323Skib freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm, 1382205323Skib &u.shmid_ds.shm_perm); 1383205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1384205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1385205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1386205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1387205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1388205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1389205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1390205323Skib } 1391285057Smjg 1392205323Skib error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1393205323Skib if (error) 1394205323Skib goto done; 1395285057Smjg 1396205323Skib /* Cases in which we need to copyout */ 1397205323Skib switch (uap->cmd) { 1398205323Skib case IPC_INFO: 1399205323Skib CP(u.shminfo, u32.shminfo32, shmmax); 1400205323Skib CP(u.shminfo, u32.shminfo32, shmmin); 1401205323Skib CP(u.shminfo, u32.shminfo32, shmmni); 1402205323Skib CP(u.shminfo, u32.shminfo32, shmseg); 1403205323Skib CP(u.shminfo, u32.shminfo32, shmall); 1404205323Skib error = copyout(&u32.shminfo32, uap->buf, 1405205323Skib sizeof(u32.shminfo32)); 1406205323Skib break; 1407205323Skib case SHM_INFO: 1408205323Skib CP(u.shm_info, u32.shm_info32, used_ids); 1409205323Skib CP(u.shm_info, u32.shm_info32, shm_rss); 1410205323Skib CP(u.shm_info, u32.shm_info32, shm_tot); 1411205323Skib CP(u.shm_info, u32.shm_info32, shm_swp); 1412205323Skib CP(u.shm_info, u32.shm_info32, swap_attempts); 1413205323Skib CP(u.shm_info, u32.shm_info32, swap_successes); 1414205323Skib error = copyout(&u32.shm_info32, uap->buf, 1415205323Skib sizeof(u32.shm_info32)); 1416205323Skib break; 1417205323Skib case SHM_STAT: 1418205323Skib case IPC_STAT: 1419205323Skib freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm, 1420205323Skib &u32.shmid_ds32.shm_perm); 1421205323Skib if (u.shmid_ds.shm_segsz > INT32_MAX) 1422205323Skib u32.shmid_ds32.shm_segsz = INT32_MAX; 1423205323Skib else 1424205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1425205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1426205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1427205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1428205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1429205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1430205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1431205323Skib u32.shmid_ds32.shm_internal = 0; 1432205323Skib error = copyout(&u32.shmid_ds32, uap->buf, 1433205323Skib sizeof(u32.shmid_ds32)); 1434205323Skib break; 1435205323Skib } 1436205323Skib 1437205323Skibdone: 1438205323Skib if (error) { 1439205323Skib /* Invalidate the return value */ 1440205323Skib td->td_retval[0] = -1; 1441205323Skib } 1442205323Skib return (error); 1443205323Skib} 1444205323Skib#endif 1445205323Skib 1446205323Skibint 1447205323Skibfreebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap) 1448205323Skib{ 1449285057Smjg int error; 1450205323Skib union { 1451205323Skib struct shmid_ds shmid_ds; 1452205323Skib struct shm_info shm_info; 1453205323Skib struct shminfo shminfo; 1454205323Skib } u; 1455205323Skib union { 1456205323Skib struct shmid_ds32 shmid_ds32; 1457205323Skib struct shm_info32 shm_info32; 1458205323Skib struct shminfo32 shminfo32; 1459205323Skib } u32; 1460205323Skib size_t sz; 1461285057Smjg 1462205323Skib if (uap->cmd == IPC_SET) { 1463205323Skib if ((error = copyin(uap->buf, &u32.shmid_ds32, 1464205323Skib sizeof(u32.shmid_ds32)))) 1465205323Skib goto done; 1466205323Skib freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm, 1467205323Skib &u.shmid_ds.shm_perm); 1468205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_segsz); 1469205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_lpid); 1470205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_cpid); 1471205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_nattch); 1472205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_atime); 1473205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_dtime); 1474205323Skib CP(u32.shmid_ds32, u.shmid_ds, shm_ctime); 1475205323Skib } 1476285057Smjg 1477205323Skib error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz); 1478205323Skib if (error) 1479205323Skib goto done; 1480285057Smjg 1481205323Skib /* Cases in which we need to copyout */ 1482205323Skib switch (uap->cmd) { 1483205323Skib case IPC_INFO: 1484205323Skib CP(u.shminfo, u32.shminfo32, shmmax); 1485205323Skib CP(u.shminfo, u32.shminfo32, shmmin); 1486205323Skib CP(u.shminfo, u32.shminfo32, shmmni); 1487205323Skib CP(u.shminfo, u32.shminfo32, shmseg); 1488205323Skib CP(u.shminfo, u32.shminfo32, shmall); 1489205323Skib error = copyout(&u32.shminfo32, uap->buf, 1490205323Skib sizeof(u32.shminfo32)); 1491205323Skib break; 1492205323Skib case SHM_INFO: 1493205323Skib CP(u.shm_info, u32.shm_info32, used_ids); 1494205323Skib CP(u.shm_info, u32.shm_info32, shm_rss); 1495205323Skib CP(u.shm_info, u32.shm_info32, shm_tot); 1496205323Skib CP(u.shm_info, u32.shm_info32, shm_swp); 1497205323Skib CP(u.shm_info, u32.shm_info32, swap_attempts); 1498205323Skib CP(u.shm_info, u32.shm_info32, swap_successes); 1499205323Skib error = copyout(&u32.shm_info32, uap->buf, 1500205323Skib sizeof(u32.shm_info32)); 1501205323Skib break; 1502205323Skib case SHM_STAT: 1503205323Skib case IPC_STAT: 1504205323Skib freebsd32_ipcperm_out(&u.shmid_ds.shm_perm, 1505205323Skib &u32.shmid_ds32.shm_perm); 1506205323Skib if (u.shmid_ds.shm_segsz > INT32_MAX) 1507205323Skib u32.shmid_ds32.shm_segsz = INT32_MAX; 1508205323Skib else 1509205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_segsz); 1510205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_lpid); 1511205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_cpid); 1512205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_nattch); 1513205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_atime); 1514205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_dtime); 1515205323Skib CP(u.shmid_ds, u32.shmid_ds32, shm_ctime); 1516205323Skib error = copyout(&u32.shmid_ds32, uap->buf, 1517205323Skib sizeof(u32.shmid_ds32)); 1518205323Skib break; 1519205323Skib } 1520205323Skib 1521205323Skibdone: 1522205323Skib if (error) { 1523205323Skib /* Invalidate the return value */ 1524205323Skib td->td_retval[0] = -1; 1525205323Skib } 1526205323Skib return (error); 1527205323Skib} 1528205323Skib#endif 1529205323Skib 1530205323Skib#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 1531205323Skib defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 1532205323Skib 1533205323Skib#ifndef CP 1534194910Sjhb#define CP(src, dst, fld) do { (dst).fld = (src).fld; } while (0) 1535205323Skib#endif 1536194910Sjhb 1537194910Sjhb#ifndef _SYS_SYSPROTO_H_ 1538194910Sjhbstruct freebsd7_shmctl_args { 1539194910Sjhb int shmid; 1540194910Sjhb int cmd; 1541194910Sjhb struct shmid_ds_old *buf; 1542194910Sjhb}; 1543194910Sjhb#endif 1544194910Sjhbint 1545280323Skibfreebsd7_shmctl(struct thread *td, struct freebsd7_shmctl_args *uap) 1546194910Sjhb{ 1547285057Smjg int error; 1548194910Sjhb struct shmid_ds_old old; 1549194910Sjhb struct shmid_ds buf; 1550194910Sjhb size_t bufsz; 1551285057Smjg 1552194910Sjhb /* 1553194910Sjhb * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support 1554194910Sjhb * Linux binaries. If we see the call come through the FreeBSD ABI, 1555194910Sjhb * return an error back to the user since we do not to support this. 1556194910Sjhb */ 1557194910Sjhb if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO || 1558194910Sjhb uap->cmd == SHM_STAT) 1559194910Sjhb return (EINVAL); 1560194910Sjhb 1561194910Sjhb /* IPC_SET needs to copyin the buffer before calling kern_shmctl */ 1562194910Sjhb if (uap->cmd == IPC_SET) { 1563194910Sjhb if ((error = copyin(uap->buf, &old, sizeof(old)))) 1564194910Sjhb goto done; 1565194910Sjhb ipcperm_old2new(&old.shm_perm, &buf.shm_perm); 1566194910Sjhb CP(old, buf, shm_segsz); 1567194910Sjhb CP(old, buf, shm_lpid); 1568194910Sjhb CP(old, buf, shm_cpid); 1569194910Sjhb CP(old, buf, shm_nattch); 1570194910Sjhb CP(old, buf, shm_atime); 1571194910Sjhb CP(old, buf, shm_dtime); 1572194910Sjhb CP(old, buf, shm_ctime); 1573194910Sjhb } 1574285057Smjg 1575194910Sjhb error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz); 1576194910Sjhb if (error) 1577194910Sjhb goto done; 1578194910Sjhb 1579194910Sjhb /* Cases in which we need to copyout */ 1580194910Sjhb switch (uap->cmd) { 1581194910Sjhb case IPC_STAT: 1582194910Sjhb ipcperm_new2old(&buf.shm_perm, &old.shm_perm); 1583194910Sjhb if (buf.shm_segsz > INT_MAX) 1584194910Sjhb old.shm_segsz = INT_MAX; 1585194910Sjhb else 1586194910Sjhb CP(buf, old, shm_segsz); 1587194910Sjhb CP(buf, old, shm_lpid); 1588194910Sjhb CP(buf, old, shm_cpid); 1589194910Sjhb if (buf.shm_nattch > SHRT_MAX) 1590194910Sjhb old.shm_nattch = SHRT_MAX; 1591194910Sjhb else 1592194910Sjhb CP(buf, old, shm_nattch); 1593194910Sjhb CP(buf, old, shm_atime); 1594194910Sjhb CP(buf, old, shm_dtime); 1595194910Sjhb CP(buf, old, shm_ctime); 1596194910Sjhb old.shm_internal = NULL; 1597194910Sjhb error = copyout(&old, uap->buf, sizeof(old)); 1598194910Sjhb break; 1599194910Sjhb } 1600194910Sjhb 1601194910Sjhbdone: 1602194910Sjhb if (error) { 1603194910Sjhb /* Invalidate the return value */ 1604194910Sjhb td->td_retval[0] = -1; 1605194910Sjhb } 1606194910Sjhb return (error); 1607194910Sjhb} 1608194910Sjhb 1609194910Sjhb#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 || 1610194910Sjhb COMPAT_FREEBSD7 */ 1611194910Sjhb 1612194894Sjhbstatic int 161369449Salfredsysvshm_modload(struct module *module, int cmd, void *arg) 161469449Salfred{ 161569449Salfred int error = 0; 161669449Salfred 161769449Salfred switch (cmd) { 161869449Salfred case MOD_LOAD: 1619205323Skib error = shminit(); 1620205323Skib if (error != 0) 1621205323Skib shmunload(); 162269449Salfred break; 162369449Salfred case MOD_UNLOAD: 162469449Salfred error = shmunload(); 162569449Salfred break; 162669449Salfred case MOD_SHUTDOWN: 162769449Salfred break; 162869449Salfred default: 162969449Salfred error = EINVAL; 163069449Salfred break; 163169449Salfred } 163269449Salfred return (error); 163369449Salfred} 163469449Salfred 163571038Sdesstatic moduledata_t sysvshm_mod = { 163671038Sdes "sysvshm", 163769449Salfred &sysvshm_modload, 163869449Salfred NULL 163969449Salfred}; 164069449Salfred 1641194832SjhbDECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST); 164271038SdesMODULE_VERSION(sysvshm, 1); 1643