X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/9bccf70c0258c7cac2dcb80011b2a964d884c552..a991bd8d3e7fe02dbca0644054bab73c5b75324a:/bsd/kern/sysv_shm.c diff --git a/bsd/kern/sysv_shm.c b/bsd/kern/sysv_shm.c index c86c5d590..7e778e60d 100644 --- a/bsd/kern/sysv_shm.c +++ b/bsd/kern/sysv_shm.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2019 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. - * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ + * + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. - * - * @APPLE_LICENSE_HEADER_END@ + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */ @@ -50,401 +56,650 @@ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ +/* + * NOTICE: This file was modified by McAfee Research in 2004 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. + * Copyright (c) 2005-2006 SPARTA, Inc. + */ #include #include #include #include -#include -#include +#include +#include +#include #include #include #include #include +#include +#include +#include +#if CONFIG_MACF +#include +#endif + +#include #include #include +#include + +#include + #include +#include +#include -struct shmat_args; -extern int shmat __P((struct proc *p, struct shmat_args *uap, int *retval)); -struct shmctl_args; -extern int shmctl __P((struct proc *p, struct shmctl_args *uap, int *retval)); -struct shmdt_args; -extern int shmdt __P((struct proc *p, struct shmdt_args *uap, int *retval)); -struct shmget_args; -extern int shmget __P((struct proc *p, struct shmget_args *uap, int *retval)); +#include +#include -#if 0 -static void shminit __P((void *)); -SYSINIT(sysv_shm, SI_SUB_SYSV_SHM, SI_ORDER_FIRST, shminit, NULL) -#endif 0 +/* Uncomment this line to see MAC debugging output. */ +/* #define MAC_DEBUG */ +#if CONFIG_MACF_DEBUG +#define MPRINTF(a) printf a +#else +#define MPRINTF(a) +#endif + +#if SYSV_SHM +static int shminit(void); -struct oshmctl_args; -static int oshmctl __P((struct proc *p, struct oshmctl_args *uap, int * retval)); -static int shmget_allocate_segment __P((struct proc *p, struct shmget_args *uap, int mode, int * retval)); -static int shmget_existing __P((struct proc *p, struct shmget_args *uap, int mode, int segnum, int * retval)); +static lck_grp_t *sysv_shm_subsys_lck_grp; +static lck_grp_attr_t *sysv_shm_subsys_lck_grp_attr; +static lck_attr_t *sysv_shm_subsys_lck_attr; +static lck_mtx_t sysv_shm_subsys_mutex; -typedef int sy_call_t __P((struct proc *, void *, int *)); +#define SYSV_SHM_SUBSYS_LOCK() lck_mtx_lock(&sysv_shm_subsys_mutex) +#define SYSV_SHM_SUBSYS_UNLOCK() lck_mtx_unlock(&sysv_shm_subsys_mutex) + +static int oshmctl(void *p, void *uap, void *retval); +static int shmget_allocate_segment(struct proc *p, struct shmget_args *uap, int mode, int * retval); +static int shmget_existing(struct shmget_args *uap, int mode, int segnum, int * retval); +static void shmid_ds_64to32(struct user_shmid_ds *in, struct user32_shmid_ds *out); +static void shmid_ds_32to64(struct user32_shmid_ds *in, struct user_shmid_ds *out); /* XXX casting to (sy_call_t *) is bogus, as usual. */ -static sy_call_t *shmcalls[] = { +static sy_call_t* const shmcalls[] = { (sy_call_t *)shmat, (sy_call_t *)oshmctl, (sy_call_t *)shmdt, (sy_call_t *)shmget, (sy_call_t *)shmctl }; -#define SHMSEG_FREE 0x0200 -#define SHMSEG_REMOVED 0x0400 -#define SHMSEG_ALLOCATED 0x0800 -#define SHMSEG_WANTED 0x1000 +#define SHMSEG_FREE 0x0200 +#define SHMSEG_REMOVED 0x0400 +#define SHMSEG_ALLOCATED 0x0800 +#define SHMSEG_WANTED 0x1000 static int shm_last_free, shm_nused, shm_committed; -struct shmid_ds *shmsegs; +struct shmid_kernel *shmsegs; /* 64 bit version */ static int shm_inited = 0; +/* + * Since anonymous memory chunks are limited to ANON_MAX_SIZE bytes, + * we have to keep a list of chunks when we want to handle a shared memory + * segment bigger than ANON_MAX_SIZE. + * Each chunk points to a VM named entry of up to ANON_MAX_SIZE bytes + * of anonymous memory. + */ struct shm_handle { - /* vm_offset_t kva; */ - void * shm_object; + void * shm_object; /* named entry for this chunk*/ + memory_object_size_t shm_handle_size; /* size of this chunk */ + struct shm_handle *shm_handle_next; /* next chunk */ }; struct shmmap_state { - vm_offset_t va; - int shmid; + mach_vm_address_t va; /* user address */ + int shmid; /* segment id */ }; -static void shm_deallocate_segment __P((struct shmid_ds *)); -static int shm_find_segment_by_key __P((key_t)); -static struct shmid_ds *shm_find_segment_by_shmid __P((int)); -static int shm_delete_mapping __P((struct proc *, struct shmmap_state *)); +static void shm_deallocate_segment(struct shmid_kernel *); +static int shm_find_segment_by_key(key_t); +static struct shmid_kernel *shm_find_segment_by_shmid(int); +static int shm_delete_mapping(struct proc *, struct shmmap_state *, int); #ifdef __APPLE_API_PRIVATE -struct shminfo shminfo = { - -1, /* SHMMAX 4096 *1024 */ - -1, /* SHMMIN = 1 */ - -1, /* SHMMNI = 1 */ - -1, /* SHMSEG = 8 */ - -1 /* SHMALL = 1024 */ +#define DEFAULT_SHMMAX (4 * 1024 * 1024) +#define DEFAULT_SHMMIN 1 +#define DEFAULT_SHMMNI 32 +#define DEFAULT_SHMSEG 8 +#define DEFAULT_SHMALL 1024 + +struct shminfo shminfo = { + .shmmax = DEFAULT_SHMMAX, + .shmmin = DEFAULT_SHMMIN, + .shmmni = DEFAULT_SHMMNI, + .shmseg = DEFAULT_SHMSEG, + .shmall = DEFAULT_SHMALL }; + +#define SHMID_IS_VALID(x) ((x) >= 0) +#define SHMID_UNALLOCATED (-1) +#define SHMID_SENTINEL (-2) + #endif /* __APPLE_API_PRIVATE */ +void sysv_shm_lock_init(void); + +static __inline__ time_t +sysv_shmtime(void) +{ + struct timeval tv; + microtime(&tv); + return tv.tv_sec; +} + +/* + * This conversion is safe, since if we are converting for a 32 bit process, + * then it's value of (struct shmid_ds)->shm_segsz will never exceed 4G. + * + * NOTE: Source and target may *NOT* overlap! (target is smaller) + */ +static void +shmid_ds_64to32(struct user_shmid_ds *in, struct user32_shmid_ds *out) +{ + out->shm_perm = in->shm_perm; + out->shm_segsz = in->shm_segsz; + out->shm_lpid = in->shm_lpid; + out->shm_cpid = in->shm_cpid; + out->shm_nattch = in->shm_nattch; + out->shm_atime = in->shm_atime; + out->shm_dtime = in->shm_dtime; + out->shm_ctime = in->shm_ctime; + out->shm_internal = CAST_DOWN_EXPLICIT(int, in->shm_internal); +} + +/* + * NOTE: Source and target may are permitted to overlap! (source is smaller); + * this works because we copy fields in order from the end of the struct to + * the beginning. + */ +static void +shmid_ds_32to64(struct user32_shmid_ds *in, struct user_shmid_ds *out) +{ + out->shm_internal = in->shm_internal; + out->shm_ctime = in->shm_ctime; + out->shm_dtime = in->shm_dtime; + out->shm_atime = in->shm_atime; + out->shm_nattch = in->shm_nattch; + out->shm_cpid = in->shm_cpid; + out->shm_lpid = in->shm_lpid; + out->shm_segsz = in->shm_segsz; + out->shm_perm = in->shm_perm; +} + + static int -shm_find_segment_by_key(key) - key_t key; +shm_find_segment_by_key(key_t key) { int i; - for (i = 0; i < shminfo.shmmni; i++) - if ((shmsegs[i].shm_perm.mode & SHMSEG_ALLOCATED) && - shmsegs[i].shm_perm.key == key) + for (i = 0; i < shminfo.shmmni; i++) { + if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && + shmsegs[i].u.shm_perm._key == key) { return i; + } + } return -1; } -static struct shmid_ds * -shm_find_segment_by_shmid(shmid) - int shmid; +static struct shmid_kernel * +shm_find_segment_by_shmid(int shmid) { int segnum; - struct shmid_ds *shmseg; + struct shmid_kernel *shmseg; segnum = IPCID_TO_IX(shmid); - if (segnum < 0 || segnum >= shminfo.shmmni) + if (segnum < 0 || segnum >= shminfo.shmmni) { return NULL; + } shmseg = &shmsegs[segnum]; - if ((shmseg->shm_perm.mode & (SHMSEG_ALLOCATED | SHMSEG_REMOVED)) + if ((shmseg->u.shm_perm.mode & (SHMSEG_ALLOCATED | SHMSEG_REMOVED)) != SHMSEG_ALLOCATED || - shmseg->shm_perm.seq != IPCID_TO_SEQ(shmid)) + shmseg->u.shm_perm._seq != IPCID_TO_SEQ(shmid)) { return NULL; + } return shmseg; } static void -shm_deallocate_segment(shmseg) - struct shmid_ds *shmseg; +shm_deallocate_segment(struct shmid_kernel *shmseg) { - struct shm_handle *shm_handle; - struct shmmap_state *shmmap_s=NULL; - size_t size; - char * ptr; - - shm_handle = shmseg->shm_internal; - size = round_page(shmseg->shm_segsz); - mach_destroy_memory_entry(shm_handle->shm_object); - FREE((caddr_t)shm_handle, M_SHM); - shmseg->shm_internal = NULL; + struct shm_handle *shm_handle, *shm_handle_next; + mach_vm_size_t size; + + for (shm_handle = CAST_DOWN(void *, shmseg->u.shm_internal); /* tunnel */ + shm_handle != NULL; + shm_handle = shm_handle_next) { + shm_handle_next = shm_handle->shm_handle_next; + mach_memory_entry_port_release(shm_handle->shm_object); + FREE(shm_handle, M_SHM); + } + shmseg->u.shm_internal = USER_ADDR_NULL; /* tunnel */ + size = vm_map_round_page(shmseg->u.shm_segsz, + vm_map_page_mask(current_map())); shm_committed -= btoc(size); shm_nused--; - shmseg->shm_perm.mode = SHMSEG_FREE; + shmseg->u.shm_perm.mode = SHMSEG_FREE; +#if CONFIG_MACF + /* Reset the MAC label */ + mac_sysvshm_label_recycle(shmseg); +#endif } static int -shm_delete_mapping(p, shmmap_s) - struct proc *p; - struct shmmap_state *shmmap_s; +shm_delete_mapping(__unused struct proc *p, struct shmmap_state *shmmap_s, + int deallocate) { - struct shmid_ds *shmseg; + struct shmid_kernel *shmseg; int segnum, result; - size_t size; + mach_vm_size_t size; segnum = IPCID_TO_IX(shmmap_s->shmid); shmseg = &shmsegs[segnum]; - size = round_page(shmseg->shm_segsz); - result = vm_deallocate(current_map(), shmmap_s->va, size); - if (result != KERN_SUCCESS) - return EINVAL; - shmmap_s->shmid = -1; - shmseg->shm_dtime = time_second; - if ((--shmseg->shm_nattch <= 0) && - (shmseg->shm_perm.mode & SHMSEG_REMOVED)) { + size = vm_map_round_page(shmseg->u.shm_segsz, + vm_map_page_mask(current_map())); /* XXX done for us? */ + if (deallocate) { + result = mach_vm_deallocate(current_map(), shmmap_s->va, size); + if (result != KERN_SUCCESS) { + return EINVAL; + } + } + shmmap_s->shmid = SHMID_UNALLOCATED; + shmseg->u.shm_dtime = sysv_shmtime(); + if ((--shmseg->u.shm_nattch <= 0) && + (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) { shm_deallocate_segment(shmseg); shm_last_free = segnum; } return 0; } -struct shmdt_args { - void *shmaddr; -}; - int -shmdt(p, uap, retval) - struct proc *p; - struct shmdt_args *uap; - register_t *retval; +shmdt(struct proc *p, struct shmdt_args *uap, int32_t *retval) { +#if CONFIG_MACF + struct shmid_kernel *shmsegptr; +#endif struct shmmap_state *shmmap_s; int i; + int shmdtret = 0; + + AUDIT_ARG(svipc_addr, uap->shmaddr); + + SYSV_SHM_SUBSYS_LOCK(); + + if ((shmdtret = shminit())) { + goto shmdt_out; + } - if (!shm_inited) - return(EINVAL); shmmap_s = (struct shmmap_state *)p->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)uap->shmaddr) + if (shmmap_s == NULL) { + shmdtret = EINVAL; + goto shmdt_out; + } + + for (; shmmap_s->shmid != SHMID_SENTINEL; shmmap_s++) { + if (SHMID_IS_VALID(shmmap_s->shmid) && + shmmap_s->va == (mach_vm_offset_t)uap->shmaddr) { break; - if (i == shminfo.shmseg) - return EINVAL; - return shm_delete_mapping(p, shmmap_s); -} + } + } -#ifndef _SYS_SYSPROTO_H_ -struct shmat_args { - int shmid; - void *shmaddr; - int shmflg; -}; + if (!SHMID_IS_VALID(shmmap_s->shmid)) { + shmdtret = EINVAL; + goto shmdt_out; + } + +#if CONFIG_MACF + /* + * XXX: It might be useful to move this into the shm_delete_mapping + * function + */ + shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)]; + shmdtret = mac_sysvshm_check_shmdt(kauth_cred_get(), shmsegptr); + if (shmdtret) { + goto shmdt_out; + } #endif + i = shm_delete_mapping(p, shmmap_s, 1); + + if (i == 0) { + *retval = 0; + } + shmdtret = i; +shmdt_out: + SYSV_SHM_SUBSYS_UNLOCK(); + return shmdtret; +} int -shmat(p, uap, retval) - struct proc *p; - struct shmat_args *uap; - register_t *retval; +shmat(struct proc *p, struct shmat_args *uap, user_addr_t *retval) { int error, i, flags; - struct ucred *cred = p->p_ucred; - struct shmid_ds *shmseg; - struct shmmap_state *shmmap_s = NULL; - struct shm_handle *shm_handle; - vm_offset_t attach_va; - vm_prot_t prot; - vm_size_t size; - kern_return_t rv; + struct shmid_kernel *shmseg; + struct shmmap_state *shmmap_s = NULL; + struct shm_handle *shm_handle; + mach_vm_address_t attach_va; /* attach address in/out */ + mach_vm_address_t shmlba; + mach_vm_size_t map_size; /* size of map entry */ + mach_vm_size_t mapped_size; + vm_prot_t prot; + size_t size; + kern_return_t rv; + int shmat_ret; + int vm_flags; + + shmat_ret = 0; + + AUDIT_ARG(svipc_id, uap->shmid); + AUDIT_ARG(svipc_addr, uap->shmaddr); + + SYSV_SHM_SUBSYS_LOCK(); + + if ((shmat_ret = shminit())) { + goto shmat_out; + } - if (!shm_inited) - return(EINVAL); shmmap_s = (struct shmmap_state *)p->vm_shm; if (shmmap_s == NULL) { - size = shminfo.shmseg * sizeof(struct shmmap_state); - shmmap_s = (struct shmmap_state *)_MALLOC(size, M_SHM, M_WAITOK); - for (i = 0; i < shminfo.shmseg; i++) - shmmap_s[i].shmid = -1; + /* lazily allocate the shm map */ + + int nsegs = shminfo.shmseg; + if (nsegs <= 0) { + shmat_ret = EMFILE; + goto shmat_out; + } + + /* +1 for the sentinel */ + if (os_add_and_mul_overflow(nsegs, 1, sizeof(struct shmmap_state), &size)) { + shmat_ret = ENOMEM; + goto shmat_out; + } + + MALLOC(shmmap_s, struct shmmap_state *, size, M_SHM, M_WAITOK | M_NULL); + if (shmmap_s == NULL) { + shmat_ret = ENOMEM; + goto shmat_out; + } + + /* initialize the entries */ + for (i = 0; i < nsegs; i++) { + shmmap_s[i].shmid = SHMID_UNALLOCATED; + } + shmmap_s[i].shmid = SHMID_SENTINEL; + p->vm_shm = (caddr_t)shmmap_s; } + shmseg = shm_find_segment_by_shmid(uap->shmid); - if (shmseg == NULL) - return EINVAL; - error = ipcperm(cred, &shmseg->shm_perm, - (uap->shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W); - if (error) - return error; - for (i = 0; i < shminfo.shmseg; i++) { - if (shmmap_s->shmid == -1) - break; + if (shmseg == NULL) { + shmat_ret = EINVAL; + goto shmat_out; + } + + AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm); + error = ipcperm(kauth_cred_get(), &shmseg->u.shm_perm, + (uap->shmflg & SHM_RDONLY) ? IPC_R : IPC_R | IPC_W); + if (error) { + shmat_ret = error; + goto shmat_out; + } + +#if CONFIG_MACF + error = mac_sysvshm_check_shmat(kauth_cred_get(), shmseg, uap->shmflg); + if (error) { + shmat_ret = error; + goto shmat_out; + } +#endif + + /* find a free shmid */ + while (SHMID_IS_VALID(shmmap_s->shmid)) { shmmap_s++; } - if (i >= shminfo.shmseg) - return EMFILE; - size = round_page(shmseg->shm_segsz); + if (shmmap_s->shmid != SHMID_UNALLOCATED) { + /* no free shmids */ + shmat_ret = EMFILE; + goto shmat_out; + } + + map_size = vm_map_round_page(shmseg->u.shm_segsz, + vm_map_page_mask(current_map())); prot = VM_PROT_READ; - if ((uap->shmflg & SHM_RDONLY) == 0) + if ((uap->shmflg & SHM_RDONLY) == 0) { prot |= VM_PROT_WRITE; + } flags = MAP_ANON | MAP_SHARED; if (uap->shmaddr) { flags |= MAP_FIXED; - if (uap->shmflg & SHM_RND) - attach_va = (vm_offset_t)uap->shmaddr & ~(SHMLBA-1); - else if (((vm_offset_t)uap->shmaddr & (SHMLBA-1)) == 0) - attach_va = (vm_offset_t)uap->shmaddr; - else - return EINVAL; + } + + attach_va = (mach_vm_address_t)uap->shmaddr; + shmlba = vm_map_page_size(current_map()); /* XXX instead of SHMLBA */ + if (uap->shmflg & SHM_RND) { + attach_va &= ~(shmlba - 1); + } else if ((attach_va & (shmlba - 1)) != 0) { + shmat_ret = EINVAL; + goto shmat_out; + } + + if (flags & MAP_FIXED) { + vm_flags = VM_FLAGS_FIXED; } else { - attach_va = round_page(uap->shmaddr); + vm_flags = VM_FLAGS_ANYWHERE; } - shm_handle = shmseg->shm_internal; - rv = vm_map(current_map(), &attach_va, size, 0, (flags & MAP_FIXED)? FALSE: TRUE, - shm_handle->shm_object, 0, FALSE, prot, prot, VM_INHERIT_DEFAULT); - if (rv != KERN_SUCCESS) - goto out; - rv = vm_inherit(current_map(), attach_va, size, - VM_INHERIT_SHARE); + mapped_size = 0; + + /* first reserve enough space... */ + rv = mach_vm_map_kernel(current_map(), + &attach_va, + map_size, + 0, + vm_flags, + VM_MAP_KERNEL_FLAGS_NONE, + VM_KERN_MEMORY_NONE, + IPC_PORT_NULL, + 0, + FALSE, + VM_PROT_NONE, + VM_PROT_NONE, + VM_INHERIT_NONE); if (rv != KERN_SUCCESS) { - (void) vm_deallocate(current_map(), attach_va, size); goto out; } shmmap_s->va = attach_va; + + /* ... then map the shared memory over the reserved space */ + for (shm_handle = CAST_DOWN(void *, shmseg->u.shm_internal);/* tunnel */ + shm_handle != NULL; + shm_handle = shm_handle->shm_handle_next) { + vm_map_size_t chunk_size; + + assert(mapped_size < map_size); + chunk_size = shm_handle->shm_handle_size; + if (chunk_size > map_size - mapped_size) { + /* + * Partial mapping of last chunk due to + * page size mismatch. + */ + assert(vm_map_page_shift(current_map()) < PAGE_SHIFT); + assert(shm_handle->shm_handle_next == NULL); + chunk_size = map_size - mapped_size; + } + rv = vm_map_enter_mem_object( + current_map(), /* process map */ + &attach_va, /* attach address */ + chunk_size, /* size to map */ + (mach_vm_offset_t)0, /* alignment mask */ + VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE, + VM_MAP_KERNEL_FLAGS_NONE, + VM_KERN_MEMORY_NONE, + shm_handle->shm_object, + (mach_vm_offset_t)0, + FALSE, + prot, + prot, + VM_INHERIT_SHARE); + if (rv != KERN_SUCCESS) { + goto out; + } + + mapped_size += chunk_size; + attach_va = attach_va + chunk_size; + } + shmmap_s->shmid = uap->shmid; - shmseg->shm_lpid = p->p_pid; - shmseg->shm_atime = time_second; - shmseg->shm_nattch++; - *retval = attach_va; - return( 0); + shmseg->u.shm_lpid = p->p_pid; + shmseg->u.shm_atime = sysv_shmtime(); + shmseg->u.shm_nattch++; + *retval = shmmap_s->va; /* XXX return -1 on error */ + shmat_ret = 0; + goto shmat_out; out: + if (mapped_size > 0) { + (void) mach_vm_deallocate(current_map(), + shmmap_s->va, + mapped_size); + } switch (rv) { case KERN_INVALID_ADDRESS: case KERN_NO_SPACE: - return (ENOMEM); + shmat_ret = ENOMEM; + break; case KERN_PROTECTION_FAILURE: - return (EACCES); + shmat_ret = EACCES; + break; default: - return (EINVAL); + shmat_ret = EINVAL; + break; } - +shmat_out: + SYSV_SHM_SUBSYS_UNLOCK(); + return shmat_ret; } -struct oshmid_ds { - struct ipc_perm shm_perm; /* operation perms */ - int shm_segsz; /* size of segment (bytes) */ - ushort shm_cpid; /* pid, creator */ - ushort 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(p, uap, retval) - struct proc *p; - struct oshmctl_args *uap; - register_t *retval; +oshmctl(__unused void *p, __unused void *uap, __unused void *retval) { -#ifdef COMPAT_43 - int error; - struct ucred *cred = p->p_ucred; - struct shmid_ds *shmseg; - struct oshmid_ds outbuf; - - if (!shm_inited) - return(EINVAL); - shmseg = shm_find_segment_by_shmid(uap->shmid); - if (shmseg == NULL) - return EINVAL; - switch (uap->cmd) { - case IPC_STAT: - error = ipcperm(cred, &shmseg->shm_perm, IPC_R); - if (error) - return error; - outbuf.shm_perm = shmseg->shm_perm; - outbuf.shm_segsz = shmseg->shm_segsz; - outbuf.shm_cpid = shmseg->shm_cpid; - outbuf.shm_lpid = shmseg->shm_lpid; - outbuf.shm_nattch = shmseg->shm_nattch; - outbuf.shm_atime = shmseg->shm_atime; - outbuf.shm_dtime = shmseg->shm_dtime; - outbuf.shm_ctime = shmseg->shm_ctime; - outbuf.shm_handle = shmseg->shm_internal; - error = copyout((caddr_t)&outbuf, uap->ubuf, sizeof(outbuf)); - if (error) - return error; - break; - default: - /* XXX casting to (sy_call_t *) is bogus, as usual. */ - return ((sy_call_t *)shmctl)(p, uap, retval); - } - return 0; -#else return EINVAL; -#endif } -#ifndef _SYS_SYSPROTO_H_ -struct shmctl_args { - int shmid; - int cmd; - struct shmid_ds *buf; -}; -#endif - +/* + * Returns: 0 Success + * EINVAL + * copyout:EFAULT + * copyin:EFAULT + * ipcperm:EPERM + * ipcperm:EACCES + */ int -shmctl(p, uap, retval) - struct proc *p; - struct shmctl_args *uap; - register_t *retval; +shmctl(__unused struct proc *p, struct shmctl_args *uap, int32_t *retval) { int error; - struct ucred *cred = p->p_ucred; - struct shmid_ds inbuf; - struct shmid_ds *shmseg; + kauth_cred_t cred = kauth_cred_get(); + struct user_shmid_ds inbuf; + struct shmid_kernel *shmseg; + + int shmctl_ret = 0; + + AUDIT_ARG(svipc_cmd, uap->cmd); + AUDIT_ARG(svipc_id, uap->shmid); + + SYSV_SHM_SUBSYS_LOCK(); + + if ((shmctl_ret = shminit())) { + goto shmctl_out; + } - if (!shm_inited) - return(EINVAL); shmseg = shm_find_segment_by_shmid(uap->shmid); - if (shmseg == NULL) - return EINVAL; + if (shmseg == NULL) { + shmctl_ret = EINVAL; + goto shmctl_out; + } + + /* XXAUDIT: This is the perms BEFORE any change by this call. This + * may not be what is desired. + */ + AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm); + +#if CONFIG_MACF + error = mac_sysvshm_check_shmctl(cred, shmseg, uap->cmd); + if (error) { + shmctl_ret = error; + goto shmctl_out; + } +#endif switch (uap->cmd) { case IPC_STAT: - error = ipcperm(cred, &shmseg->shm_perm, IPC_R); - if (error) - return error; - error = copyout((caddr_t)shmseg, uap->buf, sizeof(inbuf)); - if (error) - return error; + error = ipcperm(cred, &shmseg->u.shm_perm, IPC_R); + if (error) { + shmctl_ret = error; + goto shmctl_out; + } + + if (IS_64BIT_PROCESS(p)) { + struct user_shmid_ds shmid_ds = {}; + memcpy(&shmid_ds, &shmseg->u, sizeof(struct user_shmid_ds)); + + /* Clear kernel reserved pointer before copying to user space */ + shmid_ds.shm_internal = USER_ADDR_NULL; + + error = copyout(&shmid_ds, uap->buf, sizeof(shmid_ds)); + } else { + struct user32_shmid_ds shmid_ds32 = {}; + shmid_ds_64to32(&shmseg->u, &shmid_ds32); + + /* Clear kernel reserved pointer before copying to user space */ + shmid_ds32.shm_internal = (user32_addr_t)0; + + error = copyout(&shmid_ds32, uap->buf, sizeof(shmid_ds32)); + } + if (error) { + shmctl_ret = error; + goto shmctl_out; + } break; case IPC_SET: - error = ipcperm(cred, &shmseg->shm_perm, IPC_M); - if (error) - return error; - error = copyin(uap->buf, (caddr_t)&inbuf, sizeof(inbuf)); - if (error) - return error; - shmseg->shm_perm.uid = inbuf.shm_perm.uid; - shmseg->shm_perm.gid = inbuf.shm_perm.gid; - shmseg->shm_perm.mode = - (shmseg->shm_perm.mode & ~ACCESSPERMS) | + error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M); + if (error) { + shmctl_ret = error; + goto shmctl_out; + } + if (IS_64BIT_PROCESS(p)) { + error = copyin(uap->buf, &inbuf, sizeof(struct user_shmid_ds)); + } else { + struct user32_shmid_ds shmid_ds32; + error = copyin(uap->buf, &shmid_ds32, sizeof(shmid_ds32)); + /* convert in place; ugly, but safe */ + shmid_ds_32to64(&shmid_ds32, &inbuf); + } + if (error) { + shmctl_ret = error; + goto shmctl_out; + } + shmseg->u.shm_perm.uid = inbuf.shm_perm.uid; + shmseg->u.shm_perm.gid = inbuf.shm_perm.gid; + shmseg->u.shm_perm.mode = + (shmseg->u.shm_perm.mode & ~ACCESSPERMS) | (inbuf.shm_perm.mode & ACCESSPERMS); - shmseg->shm_ctime = time_second; + shmseg->u.shm_ctime = sysv_shmtime(); break; case IPC_RMID: - error = ipcperm(cred, &shmseg->shm_perm, IPC_M); - if (error) - return error; - shmseg->shm_perm.key = IPC_PRIVATE; - shmseg->shm_perm.mode |= SHMSEG_REMOVED; - if (shmseg->shm_nattch <= 0) { + error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M); + if (error) { + shmctl_ret = error; + goto shmctl_out; + } + 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(uap->shmid); } @@ -454,302 +709,634 @@ shmctl(p, uap, retval) case SHM_UNLOCK: #endif default: - return EINVAL; + shmctl_ret = EINVAL; + goto shmctl_out; } - return 0; + *retval = 0; + shmctl_ret = 0; +shmctl_out: + SYSV_SHM_SUBSYS_UNLOCK(); + return shmctl_ret; } -#ifndef _SYS_SYSPROTO_H_ -struct shmget_args { - key_t key; - size_t size; - int shmflg; -}; -#endif - static int -shmget_existing(p, uap, mode, segnum, retval) - struct proc *p; - struct shmget_args *uap; - int mode; - int segnum; - int *retval; +shmget_existing(struct shmget_args *uap, int mode, int segnum, int *retval) { - struct shmid_ds *shmseg; - struct ucred *cred = p->p_ucred; - int error; + struct shmid_kernel *shmseg; + int error = 0; shmseg = &shmsegs[segnum]; - if (shmseg->shm_perm.mode & SHMSEG_REMOVED) { + if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) { /* * This segment is in the process of being allocated. Wait * until it's done, and look the key up again (in case the * allocation failed or it was freed). */ - shmseg->shm_perm.mode |= SHMSEG_WANTED; + shmseg->u.shm_perm.mode |= SHMSEG_WANTED; error = tsleep((caddr_t)shmseg, PLOCK | PCATCH, "shmget", 0); - if (error) + if (error) { return error; + } return EAGAIN; } - error = ipcperm(cred, &shmseg->shm_perm, mode); - if (error) + + /* + * The low 9 bits of shmflag are the mode bits being requested, which + * are the actual mode bits desired on the segment, and not in IPC_R + * form; therefore it would be incorrect to call ipcperm() to validate + * them; instead, we AND the existing mode with the requested mode, and + * verify that it matches the requested mode; otherwise, we fail with + * EACCES (access denied). + */ + if ((shmseg->u.shm_perm.mode & mode) != mode) { + return EACCES; + } + +#if CONFIG_MACF + error = mac_sysvshm_check_shmget(kauth_cred_get(), shmseg, uap->shmflg); + if (error) { return error; - if (uap->size && uap->size > shmseg->shm_segsz) + } +#endif + + if (uap->size && uap->size > shmseg->u.shm_segsz) { return EINVAL; - if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) + } + + if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL)) { return EEXIST; - *retval = IXSEQ_TO_IPCID(segnum, shmseg->shm_perm); + } + + *retval = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); return 0; } static int -shmget_allocate_segment(p, uap, mode, retval) - struct proc *p; - struct shmget_args *uap; - int mode; - int * retval; +shmget_allocate_segment(struct proc *p, struct shmget_args *uap, int mode, + int *retval) { - int i, segnum, shmid, size; - struct ucred *cred = p->p_ucred; - struct shmid_ds *shmseg; + int i, segnum, shmid; + kauth_cred_t cred = kauth_cred_get(); + struct shmid_kernel *shmseg; struct shm_handle *shm_handle; kern_return_t kret; - vm_offset_t user_addr; + mach_vm_size_t total_size, size, alloc_size; void * mem_object; + struct shm_handle *shm_handle_next, **shm_handle_next_p; - if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax) + if (uap->size <= 0 || + uap->size < (user_size_t)shminfo.shmmin || + uap->size > (user_size_t)shminfo.shmmax) { return EINVAL; - if (shm_nused >= shminfo.shmmni) /* any shmids left? */ + } + if (shm_nused >= shminfo.shmmni) { /* any shmids left? */ return ENOSPC; - size = round_page(uap->size); - if (shm_committed + btoc(size) > shminfo.shmall) + } + if (mach_vm_round_page_overflow(uap->size, &total_size)) { + return EINVAL; + } + if ((user_ssize_t)(shm_committed + btoc(total_size)) > shminfo.shmall) { return ENOMEM; + } if (shm_last_free < 0) { - for (i = 0; i < shminfo.shmmni; i++) - if (shmsegs[i].shm_perm.mode & SHMSEG_FREE) + for (i = 0; i < shminfo.shmmni; i++) { + if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) { break; - if (i == shminfo.shmmni) + } + } + if (i == shminfo.shmmni) { panic("shmseg free count inconsistent"); + } segnum = i; - } else { + } else { segnum = shm_last_free; shm_last_free = -1; } shmseg = &shmsegs[segnum]; + /* * In case we sleep in malloc(), mark the segment present but deleted * so that noone else tries to create the same key. + * XXX but we don't release the global lock !? */ - kret = vm_allocate(current_map(), &user_addr, size, TRUE); - if (kret != KERN_SUCCESS) - goto out; + shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED; + shmseg->u.shm_perm._key = uap->key; + shmseg->u.shm_perm._seq = (shmseg->u.shm_perm._seq + 1) & 0x7fff; + + shm_handle_next_p = NULL; + for (alloc_size = 0; + alloc_size < total_size; + alloc_size += size) { + size = MIN(total_size - alloc_size, ANON_MAX_SIZE); + kret = mach_make_memory_entry_64( + VM_MAP_NULL, + (memory_object_size_t *) &size, + (memory_object_offset_t) 0, + MAP_MEM_NAMED_CREATE | VM_PROT_DEFAULT, + (ipc_port_t *) &mem_object, 0); + if (kret != KERN_SUCCESS) { + goto out; + } + + MALLOC(shm_handle, struct shm_handle *, sizeof(struct shm_handle), M_SHM, M_WAITOK); + if (shm_handle == NULL) { + kret = KERN_NO_SPACE; + mach_memory_entry_port_release(mem_object); + mem_object = NULL; + goto out; + } + shm_handle->shm_object = mem_object; + shm_handle->shm_handle_size = size; + shm_handle->shm_handle_next = NULL; + if (shm_handle_next_p == NULL) { + shmseg->u.shm_internal = CAST_USER_ADDR_T(shm_handle);/* tunnel */ + } else { + *shm_handle_next_p = shm_handle; + } + shm_handle_next_p = &shm_handle->shm_handle_next; + } - kret = mach_make_memory_entry (current_map(), &size, - user_addr, VM_PROT_DEFAULT, &mem_object, 0); + shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); - if (kret != KERN_SUCCESS) - goto out; - shmseg->shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED; - shmseg->shm_perm.key = uap->key; - shmseg->shm_perm.seq = (shmseg->shm_perm.seq + 1) & 0x7fff; - shm_handle = (struct shm_handle *) - _MALLOC(sizeof(struct shm_handle), M_SHM, M_WAITOK); - shm_handle->shm_object = mem_object; - shmid = IXSEQ_TO_IPCID(segnum, shmseg->shm_perm); - - shmseg->shm_internal = shm_handle; - shmseg->shm_perm.cuid = shmseg->shm_perm.uid = cred->cr_uid; - shmseg->shm_perm.cgid = shmseg->shm_perm.gid = cred->cr_gid; - shmseg->shm_perm.mode = (shmseg->shm_perm.mode & SHMSEG_WANTED) | + shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = kauth_cred_getuid(cred); + shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = kauth_cred_getgid(cred); + shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) | (mode & ACCESSPERMS) | SHMSEG_ALLOCATED; - shmseg->shm_segsz = uap->size; - shmseg->shm_cpid = p->p_pid; - shmseg->shm_lpid = shmseg->shm_nattch = 0; - shmseg->shm_atime = shmseg->shm_dtime = 0; - shmseg->shm_ctime = time_second; + shmseg->u.shm_segsz = uap->size; + shmseg->u.shm_cpid = p->p_pid; + shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0; + shmseg->u.shm_atime = shmseg->u.shm_dtime = 0; +#if CONFIG_MACF + mac_sysvshm_label_associate(cred, shmseg); +#endif + shmseg->u.shm_ctime = sysv_shmtime(); shm_committed += btoc(size); shm_nused++; - if (shmseg->shm_perm.mode & SHMSEG_WANTED) { + AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm); + if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) { /* * Somebody else wanted this key while we were asleep. Wake * them up now. */ - shmseg->shm_perm.mode &= ~SHMSEG_WANTED; + shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED; wakeup((caddr_t)shmseg); } *retval = shmid; + AUDIT_ARG(svipc_id, shmid); return 0; -out: +out: + if (kret != KERN_SUCCESS) { + for (shm_handle = CAST_DOWN(void *, shmseg->u.shm_internal); /* tunnel */ + shm_handle != NULL; + shm_handle = shm_handle_next) { + shm_handle_next = shm_handle->shm_handle_next; + mach_memory_entry_port_release(shm_handle->shm_object); + FREE(shm_handle, M_SHM); + } + shmseg->u.shm_internal = USER_ADDR_NULL; /* tunnel */ + } + switch (kret) { case KERN_INVALID_ADDRESS: case KERN_NO_SPACE: - return (ENOMEM); + return ENOMEM; case KERN_PROTECTION_FAILURE: - return (EACCES); + return EACCES; default: - return (EINVAL); + return EINVAL; } - } int -shmget(p, uap, retval) - struct proc *p; - struct shmget_args *uap; - register_t *retval; +shmget(struct proc *p, struct shmget_args *uap, int32_t *retval) { int segnum, mode, error; + int shmget_ret = 0; + + /* Auditing is actually done in shmget_allocate_segment() */ - if (!shm_inited) - return(EINVAL); + SYSV_SHM_SUBSYS_LOCK(); + + if ((shmget_ret = shminit())) { + goto shmget_out; + } mode = uap->shmflg & ACCESSPERMS; if (uap->key != IPC_PRIVATE) { - again: +again: segnum = shm_find_segment_by_key(uap->key); if (segnum >= 0) { - error = shmget_existing(p, uap, mode, segnum, retval); - if (error == EAGAIN) + error = shmget_existing(uap, mode, segnum, retval); + if (error == EAGAIN) { goto again; - return(error); + } + shmget_ret = error; + goto shmget_out; + } + if ((uap->shmflg & IPC_CREAT) == 0) { + shmget_ret = ENOENT; + goto shmget_out; } - if ((uap->shmflg & IPC_CREAT) == 0) - return ENOENT; } - return( shmget_allocate_segment(p, uap, mode, retval));; - /*NOTREACHED*/ - + shmget_ret = shmget_allocate_segment(p, uap, mode, retval); +shmget_out: + SYSV_SHM_SUBSYS_UNLOCK(); + return shmget_ret; } -struct shmsys_args { - u_int which; - int a2; - int a3; - int a4; -}; +/* + * shmsys + * + * Entry point for all SHM calls: shmat, oshmctl, shmdt, shmget, shmctl + * + * Parameters: p Process requesting the call + * uap User argument descriptor (see below) + * retval Return value of the selected shm call + * + * Indirect parameters: uap->which msg call to invoke (index in array of shm calls) + * uap->a2 User argument descriptor + * + * Returns: 0 Success + * !0 Not success + * + * Implicit returns: retval Return value of the selected shm call + * + * DEPRECATED: This interface should not be used to call the other SHM + * functions (shmat, oshmctl, shmdt, shmget, shmctl). The correct + * usage is to call the other SHM functions directly. + */ int -shmsys(p, uap, retval) - struct proc *p; - /* XXX actually varargs. */ - struct shmsys_args *uap; - register_t *retval; +shmsys(struct proc *p, struct shmsys_args *uap, int32_t *retval) { + /* The routine that we are dispatching already does this */ - if (!shm_inited) - return(EINVAL); - - if (uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0])) + if (uap->which >= sizeof(shmcalls) / sizeof(shmcalls[0])) { return EINVAL; - return ((*shmcalls[uap->which])(p, &uap->a2, retval)); + } + return (*shmcalls[uap->which])(p, &uap->a2, retval); } -void -shmfork(p1, p2) - struct proc *p1, *p2; +/* + * Return 0 on success, 1 on failure. + */ +int +shmfork(struct proc *p1, struct proc *p2) { struct shmmap_state *shmmap_s; size_t size; - int i; + int nsegs = 0; + int ret = 0; - if (!shm_inited) - return; - size = shminfo.shmseg * sizeof(struct shmmap_state); - shmmap_s = (struct shmmap_state *)_MALLOC(size, M_SHM, M_WAITOK); - bcopy((caddr_t)p1->vm_shm, (caddr_t)shmmap_s, size); + SYSV_SHM_SUBSYS_LOCK(); + + if (shminit()) { + ret = 1; + goto shmfork_out; + } + + struct shmmap_state *src = (struct shmmap_state *)p1->vm_shm; + assert(src); + + /* count number of shmid entries in src */ + for (struct shmmap_state *s = src; s->shmid != SHMID_SENTINEL; s++) { + nsegs++; + } + + if (os_add_and_mul_overflow(nsegs, 1, sizeof(struct shmmap_state), &size)) { + ret = 1; + goto shmfork_out; + } + MALLOC(shmmap_s, struct shmmap_state *, size, M_SHM, M_WAITOK); + if (shmmap_s == NULL) { + ret = 1; + goto shmfork_out; + } + + bcopy(src, (caddr_t)shmmap_s, size); p2->vm_shm = (caddr_t)shmmap_s; - for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) - if (shmmap_s->shmid != -1) - shmsegs[IPCID_TO_IX(shmmap_s->shmid)].shm_nattch++; + for (; shmmap_s->shmid != SHMID_SENTINEL; shmmap_s++) { + if (SHMID_IS_VALID(shmmap_s->shmid)) { + shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; + } + } + +shmfork_out: + SYSV_SHM_SUBSYS_UNLOCK(); + return ret; } -void -shmexit(p) - struct proc *p; +static void +shmcleanup(struct proc *p, int deallocate) { struct shmmap_state *shmmap_s; - int i; + + SYSV_SHM_SUBSYS_LOCK(); shmmap_s = (struct shmmap_state *)p->vm_shm; - for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) - if (shmmap_s->shmid != -1) - shm_delete_mapping(p, shmmap_s); - FREE((caddr_t)p->vm_shm, M_SHM); + for (; shmmap_s->shmid != SHMID_SENTINEL; shmmap_s++) { + if (SHMID_IS_VALID(shmmap_s->shmid)) { + /* + * XXX: Should the MAC framework enforce + * check here as well. + */ + shm_delete_mapping(p, shmmap_s, deallocate); + } + } + + FREE(p->vm_shm, M_SHM); p->vm_shm = NULL; + SYSV_SHM_SUBSYS_UNLOCK(); } void -shminit(dummy) - void *dummy; +shmexit(struct proc *p) +{ + shmcleanup(p, 1); +} + +/* + * shmexec() is like shmexit(), only it doesn't delete the mappings, + * since the old address space has already been destroyed and the new + * one instantiated. Instead, it just does the housekeeping work we + * need to do to keep the System V shared memory subsystem sane. + */ +__private_extern__ void +shmexec(struct proc *p) +{ + shmcleanup(p, 0); +} + +int +shminit(void) { + size_t sz; int i; - int s; if (!shm_inited) { - s = sizeof(struct shmid_ds) * shminfo.shmmni; + /* + * we store internally 64 bit, since if we didn't, we would + * be unable to represent a segment size in excess of 32 bits + * with the (struct shmid_ds)->shm_segsz field; also, POSIX + * dictates this filed be a size_t, which is 64 bits when + * running 64 bit binaries. + */ + if (os_mul_overflow(shminfo.shmmni, sizeof(struct shmid_kernel), &sz)) { + return ENOMEM; + } - MALLOC(shmsegs, struct shmid_ds *, s, - M_SHM, M_WAITOK); + MALLOC(shmsegs, struct shmid_kernel *, sz, M_SHM, M_WAITOK | M_ZERO); + if (shmsegs == NULL) { + return ENOMEM; + } for (i = 0; i < shminfo.shmmni; i++) { - shmsegs[i].shm_perm.mode = SHMSEG_FREE; - shmsegs[i].shm_perm.seq = 0; + shmsegs[i].u.shm_perm.mode = SHMSEG_FREE; + shmsegs[i].u.shm_perm._seq = 0; +#if CONFIG_MACF + mac_sysvshm_label_init(&shmsegs[i]); +#endif } shm_last_free = 0; shm_nused = 0; shm_committed = 0; shm_inited = 1; } + + return 0; +} + +/* Initialize the mutex governing access to the SysV shm subsystem */ +__private_extern__ void +sysv_shm_lock_init( void ) +{ + sysv_shm_subsys_lck_grp_attr = lck_grp_attr_alloc_init(); + + sysv_shm_subsys_lck_grp = lck_grp_alloc_init("sysv_shm_subsys_lock", sysv_shm_subsys_lck_grp_attr); + + sysv_shm_subsys_lck_attr = lck_attr_alloc_init(); + lck_mtx_init(&sysv_shm_subsys_mutex, sysv_shm_subsys_lck_grp, sysv_shm_subsys_lck_attr); } /* (struct sysctl_oid *oidp, void *arg1, int arg2, \ - struct sysctl_req *req) */ + * struct sysctl_req *req) */ static int -sysctl_shminfo SYSCTL_HANDLER_ARGS +sysctl_shminfo(__unused struct sysctl_oid *oidp, void *arg1, + __unused int arg2, struct sysctl_req *req) { int error = 0; + int sysctl_shminfo_ret = 0; + int64_t saved_shmmax; + int64_t saved_shmmin; + int64_t saved_shmseg; + int64_t saved_shmmni; + int64_t saved_shmall; + + error = SYSCTL_OUT(req, arg1, sizeof(int64_t)); + if (error || req->newptr == USER_ADDR_NULL) { + return error; + } - error = SYSCTL_OUT(req, arg1, sizeof(int)); - if (error || !req->newptr) - return(error); + SYSV_SHM_SUBSYS_LOCK(); - /* Set the values only if shared memory is not initialised */ - if (!shm_inited) { - if (error = SYSCTL_IN(req, arg1, sizeof(int))) - return(error); - if (arg1 == &shminfo.shmmax) { - if (shminfo.shmmax & PAGE_MASK) { - shminfo.shmmax = -1; - return(EINVAL); + /* shmmni can not be changed after SysV SHM has been initialized */ + if (shm_inited && arg1 == &shminfo.shmmni) { + sysctl_shminfo_ret = EPERM; + goto sysctl_shminfo_out; + } + saved_shmmax = shminfo.shmmax; + saved_shmmin = shminfo.shmmin; + saved_shmseg = shminfo.shmseg; + saved_shmmni = shminfo.shmmni; + saved_shmall = shminfo.shmall; + + if ((error = SYSCTL_IN(req, arg1, sizeof(int64_t))) != 0) { + sysctl_shminfo_ret = error; + goto sysctl_shminfo_out; + } + + if (arg1 == &shminfo.shmmax) { + /* shmmax needs to be page-aligned */ + if (shminfo.shmmax & PAGE_MASK_64 || shminfo.shmmax < 0) { + shminfo.shmmax = saved_shmmax; + sysctl_shminfo_ret = EINVAL; + goto sysctl_shminfo_out; + } + } else if (arg1 == &shminfo.shmmin) { + if (shminfo.shmmin < 0) { + shminfo.shmmin = saved_shmmin; + sysctl_shminfo_ret = EINVAL; + goto sysctl_shminfo_out; + } + } else if (arg1 == &shminfo.shmseg) { + /* add a sanity check - 20847256 */ + if (shminfo.shmseg > INT32_MAX || shminfo.shmseg < 0) { + shminfo.shmseg = saved_shmseg; + sysctl_shminfo_ret = EINVAL; + goto sysctl_shminfo_out; + } + } else if (arg1 == &shminfo.shmmni) { + /* add a sanity check - 20847256 */ + if (shminfo.shmmni > INT32_MAX || shminfo.shmmni < 0) { + shminfo.shmmni = saved_shmmni; + sysctl_shminfo_ret = EINVAL; + goto sysctl_shminfo_out; + } + } else if (arg1 == &shminfo.shmall) { + /* add a sanity check - 20847256 */ + if (shminfo.shmall > INT32_MAX || shminfo.shmall < 0) { + shminfo.shmall = saved_shmall; + sysctl_shminfo_ret = EINVAL; + goto sysctl_shminfo_out; + } + } + sysctl_shminfo_ret = 0; +sysctl_shminfo_out: + SYSV_SHM_SUBSYS_UNLOCK(); + return sysctl_shminfo_ret; +} + +static int +IPCS_shm_sysctl(__unused struct sysctl_oid *oidp, __unused void *arg1, + __unused int arg2, struct sysctl_req *req) +{ + int error; + int cursor; + union { + struct user32_IPCS_command u32; + struct user_IPCS_command u64; + } ipcs = { }; + struct user32_shmid_ds shmid_ds32 = { }; /* post conversion, 32 bit version */ + struct user_shmid_ds shmid_ds = { }; /* 64 bit version */ + void *shmid_dsp; + size_t ipcs_sz = sizeof(struct user_IPCS_command); + size_t shmid_ds_sz = sizeof(struct user_shmid_ds); + struct proc *p = current_proc(); + + SYSV_SHM_SUBSYS_LOCK(); + + if ((error = shminit())) { + goto ipcs_shm_sysctl_out; + } + + if (!IS_64BIT_PROCESS(p)) { + ipcs_sz = sizeof(struct user32_IPCS_command); + shmid_ds_sz = sizeof(struct user32_shmid_ds); + } + + /* Copy in the command structure */ + if ((error = SYSCTL_IN(req, &ipcs, ipcs_sz)) != 0) { + goto ipcs_shm_sysctl_out; + } + + if (!IS_64BIT_PROCESS(p)) { /* convert in place */ + ipcs.u64.ipcs_data = CAST_USER_ADDR_T(ipcs.u32.ipcs_data); + } + + /* Let us version this interface... */ + if (ipcs.u64.ipcs_magic != IPCS_MAGIC) { + error = EINVAL; + goto ipcs_shm_sysctl_out; + } + + switch (ipcs.u64.ipcs_op) { + case IPCS_SHM_CONF: /* Obtain global configuration data */ + if (ipcs.u64.ipcs_datalen != sizeof(struct shminfo)) { + if (ipcs.u64.ipcs_cursor != 0) { /* fwd. compat. */ + error = ENOMEM; + break; + } + error = ERANGE; + break; + } + error = copyout(&shminfo, ipcs.u64.ipcs_data, ipcs.u64.ipcs_datalen); + break; + + case IPCS_SHM_ITER: /* Iterate over existing segments */ + cursor = ipcs.u64.ipcs_cursor; + if (cursor < 0 || cursor >= shminfo.shmmni) { + error = ERANGE; + break; + } + if (ipcs.u64.ipcs_datalen != (int)shmid_ds_sz) { + error = EINVAL; + break; + } + for (; cursor < shminfo.shmmni; cursor++) { + if (shmsegs[cursor].u.shm_perm.mode & SHMSEG_ALLOCATED) { + break; } + continue; } + if (cursor == shminfo.shmmni) { + error = ENOENT; + break; + } + + shmid_dsp = &shmsegs[cursor]; /* default: 64 bit */ + + /* + * If necessary, convert the 64 bit kernel segment + * descriptor to a 32 bit user one. + */ + if (!IS_64BIT_PROCESS(p)) { + shmid_ds_64to32(shmid_dsp, &shmid_ds32); + + /* Clear kernel reserved pointer before copying to user space */ + shmid_ds32.shm_internal = (user32_addr_t)0; + + shmid_dsp = &shmid_ds32; + } else { + memcpy(&shmid_ds, shmid_dsp, sizeof(shmid_ds)); - /* Initialize only when all values are set */ - if ((shminfo.shmmax != -1) && - (shminfo.shmmin != -1) && - (shminfo.shmmni != -1) && - (shminfo.shmseg != -1) && - (shminfo.shmall != -1)) { - shminit(); + /* Clear kernel reserved pointer before copying to user space */ + shmid_ds.shm_internal = USER_ADDR_NULL; + + shmid_dsp = &shmid_ds; + } + error = copyout(shmid_dsp, ipcs.u64.ipcs_data, ipcs.u64.ipcs_datalen); + if (!error) { + /* update cursor */ + ipcs.u64.ipcs_cursor = cursor + 1; + + if (!IS_64BIT_PROCESS(p)) { /* convert in place */ + ipcs.u32.ipcs_data = CAST_DOWN_EXPLICIT(user32_addr_t, ipcs.u64.ipcs_data); + } + + error = SYSCTL_OUT(req, &ipcs, ipcs_sz); } + break; + + default: + error = EINVAL; + break; } - return(0); +ipcs_shm_sysctl_out: + SYSV_SHM_SUBSYS_UNLOCK(); + return error; } -SYSCTL_NODE(_kern, KERN_SYSV, sysv, CTLFLAG_RW, 0, "SYSV"); +SYSCTL_NODE(_kern, KERN_SYSV, sysv, CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_ANYBODY, 0, "SYSV"); + +SYSCTL_PROC(_kern_sysv, OID_AUTO, shmmax, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, + &shminfo.shmmax, 0, &sysctl_shminfo, "Q", "shmmax"); -SYSCTL_PROC(_kern_sysv, KSYSV_SHMMAX, shmmax, CTLTYPE_INT | CTLFLAG_RW, - &shminfo.shmmax, 0, &sysctl_shminfo ,"I","shmmax"); +SYSCTL_PROC(_kern_sysv, OID_AUTO, shmmin, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, + &shminfo.shmmin, 0, &sysctl_shminfo, "Q", "shmmin"); -SYSCTL_PROC(_kern_sysv, KSYSV_SHMMIN, shmmin, CTLTYPE_INT | CTLFLAG_RW, - &shminfo.shmmin, 0, &sysctl_shminfo ,"I","shmmin"); +SYSCTL_PROC(_kern_sysv, OID_AUTO, shmmni, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, + &shminfo.shmmni, 0, &sysctl_shminfo, "Q", "shmmni"); -SYSCTL_PROC(_kern_sysv, KSYSV_SHMMNI, shmmni, CTLTYPE_INT | CTLFLAG_RW, - &shminfo.shmmni, 0, &sysctl_shminfo ,"I","shmmni"); +SYSCTL_PROC(_kern_sysv, OID_AUTO, shmseg, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, + &shminfo.shmseg, 0, &sysctl_shminfo, "Q", "shmseg"); -SYSCTL_PROC(_kern_sysv, KSYSV_SHMSEG, shmseg, CTLTYPE_INT | CTLFLAG_RW, - &shminfo.shmseg, 0, &sysctl_shminfo ,"I","shmseg"); +SYSCTL_PROC(_kern_sysv, OID_AUTO, shmall, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, + &shminfo.shmall, 0, &sysctl_shminfo, "Q", "shmall"); -SYSCTL_PROC(_kern_sysv, KSYSV_SHMALL, shmall, CTLTYPE_INT | CTLFLAG_RW, - &shminfo.shmall, 0, &sysctl_shminfo ,"I","shmall"); +SYSCTL_NODE(_kern_sysv, OID_AUTO, ipcs, CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_ANYBODY, 0, "SYSVIPCS"); +SYSCTL_PROC(_kern_sysv_ipcs, OID_AUTO, shm, CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_LOCKED, + 0, 0, IPCS_shm_sysctl, + "S,IPCS_shm_command", + "ipcs shm command interface"); +#endif /* SYSV_SHM */ +/* DSEP Review Done pl-20051108-v02 @2743,@2908,@2913,@3009 */