X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/c0fea4742e91338fffdcf79f86a7c1d5e2b97eb1..bb59bff194111743b33cc36712410b5656329d3c:/bsd/kern/sysv_shm.c diff --git a/bsd/kern/sysv_shm.c b/bsd/kern/sysv_shm.c index 09f12c6d5..caed4c433 100644 --- a/bsd/kern/sysv_shm.c +++ b/bsd/kern/sysv_shm.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_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 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. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * 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. + * 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_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */ @@ -50,6 +56,13 @@ * (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 @@ -66,8 +79,11 @@ #include #include #include +#if CONFIG_MACF +#include +#endif -#include +#include #include #include @@ -76,15 +92,23 @@ #include #include -#include #include #include +/* 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 void shminit(void *); #if 0 SYSINIT(sysv_shm, SI_SUB_SYSV_SHM, SI_ORDER_FIRST, shminit, NULL) -#endif 0 +#endif static lck_grp_t *sysv_shm_subsys_lck_grp; static lck_grp_attr_t *sysv_shm_subsys_lck_grp_attr; @@ -97,8 +121,8 @@ static lck_mtx_t 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 shmid_ds *out); -static void shmid_ds_32to64(struct shmid_ds *in, struct user_shmid_ds *out); +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[] = { @@ -113,11 +137,20 @@ static sy_call_t *shmcalls[] = { #define SHMSEG_WANTED 0x1000 static int shm_last_free, shm_nused, shm_committed; -struct user_shmid_ds *shmsegs; /* 64 bit version */ +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 { - void * shm_object; /* vm_offset_t kva; */ + 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 { @@ -125,18 +158,23 @@ struct shmmap_state { int shmid; /* segment id */ }; -static void shm_deallocate_segment(struct user_shmid_ds *); +static void shm_deallocate_segment(struct shmid_kernel *); static int shm_find_segment_by_key(key_t); -static struct user_shmid_ds *shm_find_segment_by_shmid(int); +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 +#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 = { - -1, /* SHMMAX 4096 *1024 */ - -1, /* SHMMIN = 1 */ - -1, /* SHMMNI = 1 */ - -1, /* SHMSEG = 8 */ - -1 /* SHMALL = 1024 */ + DEFAULT_SHMMAX, + DEFAULT_SHMMIN, + DEFAULT_SHMMNI, + DEFAULT_SHMSEG, + DEFAULT_SHMALL }; #endif /* __APPLE_API_PRIVATE */ @@ -157,17 +195,17 @@ sysv_shmtime(void) * NOTE: Source and target may *NOT* overlap! (target is smaller) */ static void -shmid_ds_64to32(struct user_shmid_ds *in, struct shmid_ds *out) +shmid_ds_64to32(struct user_shmid_ds *in, struct user32_shmid_ds *out) { out->shm_perm = in->shm_perm; - out->shm_segsz = (size_t)in->shm_segsz; + 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(void *,in->shm_internal); + out->shm_internal = CAST_DOWN_EXPLICIT(int,in->shm_internal); } /* @@ -176,16 +214,16 @@ shmid_ds_64to32(struct user_shmid_ds *in, struct shmid_ds *out) * the beginning. */ static void -shmid_ds_32to64(struct shmid_ds *in, struct user_shmid_ds *out) +shmid_ds_32to64(struct user32_shmid_ds *in, struct user_shmid_ds *out) { - out->shm_internal = CAST_USER_ADDR_T(in->shm_internal); + 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 = (user_size_t)in->shm_segsz; + out->shm_segsz = in->shm_segsz; out->shm_perm = in->shm_perm; } @@ -196,66 +234,73 @@ 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) + if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) && + shmsegs[i].u.shm_perm._key == key) return i; return -1; } -static struct user_shmid_ds * +static struct shmid_kernel * shm_find_segment_by_shmid(int shmid) { int segnum; - struct user_shmid_ds *shmseg; + struct shmid_kernel *shmseg; segnum = IPCID_TO_IX(shmid); 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(struct user_shmid_ds *shmseg) +shm_deallocate_segment(struct shmid_kernel *shmseg) { - struct shm_handle *shm_handle; + struct shm_handle *shm_handle, *shm_handle_next; mach_vm_size_t size; - shm_handle = CAST_DOWN(void *,shmseg->shm_internal); /* tunnel */ - size = mach_vm_round_page(shmseg->shm_segsz); - mach_memory_entry_port_release(shm_handle->shm_object); - shm_handle->shm_object = NULL; - FREE((caddr_t)shm_handle, M_SHM); - shmseg->shm_internal = USER_ADDR_NULL; /* tunnel */ + 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((caddr_t) shm_handle, M_SHM); + } + shmseg->u.shm_internal = USER_ADDR_NULL; /* tunnel */ + size = mach_vm_round_page(shmseg->u.shm_segsz); 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(__unused struct proc *p, struct shmmap_state *shmmap_s, int deallocate) { - struct user_shmid_ds *shmseg; + struct shmid_kernel *shmseg; int segnum, result; mach_vm_size_t size; segnum = IPCID_TO_IX(shmmap_s->shmid); shmseg = &shmsegs[segnum]; - size = mach_vm_round_page(shmseg->shm_segsz); /* XXX done for us? */ + size = mach_vm_round_page(shmseg->u.shm_segsz); /* 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 = -1; - shmseg->shm_dtime = sysv_shmtime(); - if ((--shmseg->shm_nattch <= 0) && - (shmseg->shm_perm.mode & SHMSEG_REMOVED)) { + 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; } @@ -263,20 +308,21 @@ shm_delete_mapping(__unused struct proc *p, struct shmmap_state *shmmap_s, } int -shmdt(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; - // LP64todo - fix this - AUDIT_ARG(svipc_addr, CAST_DOWN(void *,uap->shmaddr)); + AUDIT_ARG(svipc_addr, uap->shmaddr); SYSV_SHM_SUBSYS_LOCK(); if (!shm_inited) { - shmdtret = EINVAL; - goto shmdt_out; + shminit(NULL); } shmmap_s = (struct shmmap_state *)p->vm_shm; if (shmmap_s == NULL) { @@ -292,6 +338,16 @@ shmdt(struct proc *p, struct shmdt_args *uap, register_t *retval) 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) @@ -303,28 +359,30 @@ shmdt_out: } int -shmat(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 user_shmid_ds *shmseg; + 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_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 = 0; + int shmat_ret; + int vm_flags; + + shmat_ret = 0; AUDIT_ARG(svipc_id, uap->shmid); - // LP64todo - fix this - AUDIT_ARG(svipc_addr, CAST_DOWN(void *,uap->shmaddr)); + AUDIT_ARG(svipc_addr, uap->shmaddr); SYSV_SHM_SUBSYS_LOCK(); if (!shm_inited) { - shmat_ret = EINVAL; - goto shmat_out; + shminit(NULL); } shmmap_s = (struct shmmap_state *)p->vm_shm; @@ -346,14 +404,21 @@ shmat(struct proc *p, struct shmat_args *uap, register_t *retval) goto shmat_out; } - AUDIT_ARG(svipc_perm, &shmseg->shm_perm); - error = ipcperm(kauth_cred_get(), &shmseg->shm_perm, + 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 for (i = 0; i < shminfo.shmseg; i++) { if (shmmap_s->shmid == -1) break; @@ -364,7 +429,7 @@ shmat(struct proc *p, struct shmat_args *uap, register_t *retval) goto shmat_out; } - map_size = mach_vm_round_page(shmseg->shm_segsz); + map_size = mach_vm_round_page(shmseg->u.shm_segsz); prot = VM_PROT_READ; if ((uap->shmflg & SHM_RDONLY) == 0) prot |= VM_PROT_WRITE; @@ -380,45 +445,80 @@ shmat(struct proc *p, struct shmat_args *uap, register_t *retval) goto shmat_out; } - shm_handle = CAST_DOWN(void *, shmseg->shm_internal); /* tunnel */ + if (flags & MAP_FIXED) { + vm_flags = VM_FLAGS_FIXED; + } else { + vm_flags = VM_FLAGS_ANYWHERE; + } + + mapped_size = 0; + + /* first reserve enough space... */ + rv = mach_vm_map(current_map(), + &attach_va, + map_size, + 0, + vm_flags, + IPC_PORT_NULL, + 0, + FALSE, + VM_PROT_NONE, + VM_PROT_NONE, + VM_INHERIT_NONE); + if (rv != KERN_SUCCESS) { + goto out; + } + + shmmap_s->va = attach_va; - rv = mach_vm_map(current_map(), /* process map */ - &attach_va, /* attach address */ - map_size, /* segment size */ - (mach_vm_offset_t)0, /* alignment mask */ - (flags & MAP_FIXED)? VM_FLAGS_FIXED: VM_FLAGS_ANYWHERE, + /* ... 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) { + + rv = vm_map_enter_mem_object( + current_map(), /* process map */ + &attach_va, /* attach address */ + shm_handle->shm_handle_size, /* segment size */ + (mach_vm_offset_t)0, /* alignment mask */ + VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE, shm_handle->shm_object, (mach_vm_offset_t)0, FALSE, prot, prot, - VM_INHERIT_DEFAULT); - if (rv != KERN_SUCCESS) + VM_INHERIT_SHARE); + if (rv != KERN_SUCCESS) goto out; - rv = mach_vm_inherit(current_map(), attach_va, map_size, VM_INHERIT_SHARE); - if (rv != KERN_SUCCESS) { - (void)mach_vm_deallocate(current_map(), attach_va, map_size); - goto out; + mapped_size += shm_handle->shm_handle_size; + attach_va = attach_va + shm_handle->shm_handle_size; } - shmmap_s->va = attach_va; shmmap_s->shmid = uap->shmid; - shmseg->shm_lpid = p->p_pid; - shmseg->shm_atime = sysv_shmtime(); - shmseg->shm_nattch++; - *retval = attach_va; /* XXX return -1 on error */ + 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: shmat_ret = ENOMEM; + break; case KERN_PROTECTION_FAILURE: shmat_ret = EACCES; + break; default: shmat_ret = EINVAL; + break; } shmat_out: SYSV_SHM_SUBSYS_UNLOCK(); @@ -431,14 +531,21 @@ oshmctl(__unused void *p, __unused void *uap, __unused void *retval) return EINVAL; } +/* + * Returns: 0 Success + * EINVAL + * copyout:EFAULT + * copyin:EFAULT + * ipcperm:EPERM + * ipcperm:EACCES + */ int -shmctl(__unused struct proc *p, struct shmctl_args *uap, register_t *retval) +shmctl(__unused struct proc *p, struct shmctl_args *uap, int32_t *retval) { int error; kauth_cred_t cred = kauth_cred_get(); struct user_shmid_ds inbuf; - struct user_shmid_ds *shmseg; - size_t shmid_ds_sz = sizeof(struct user_shmid_ds); + struct shmid_kernel *shmseg; int shmctl_ret = 0; @@ -448,13 +555,9 @@ shmctl(__unused struct proc *p, struct shmctl_args *uap, register_t *retval) SYSV_SHM_SUBSYS_LOCK(); if (!shm_inited) { - shmctl_ret = EINVAL; - goto shmctl_out; + shminit(NULL); } - if (!IS_64BIT_PROCESS(p)) - shmid_ds_sz = sizeof(struct shmid_ds); - shmseg = shm_find_segment_by_shmid(uap->shmid); if (shmseg == NULL) { shmctl_ret = EINVAL; @@ -464,22 +567,39 @@ shmctl(__unused struct proc *p, struct shmctl_args *uap, register_t *retval) /* XXAUDIT: This is the perms BEFORE any change by this call. This * may not be what is desired. */ - AUDIT_ARG(svipc_perm, &shmseg->shm_perm); + 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); + error = ipcperm(cred, &shmseg->u.shm_perm, IPC_R); if (error) { shmctl_ret = error; goto shmctl_out; } if (IS_64BIT_PROCESS(p)) { - error = copyout(shmseg, uap->buf, sizeof(struct user_shmid_ds)); + 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 shmid_ds shmid_ds32; - shmid_ds_64to32(shmseg, &shmid_ds32); - error = copyout(&shmid_ds32, uap->buf, sizeof(struct shmid_ds)); + 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; @@ -487,7 +607,7 @@ shmctl(__unused struct proc *p, struct shmctl_args *uap, register_t *retval) } break; case IPC_SET: - error = ipcperm(cred, &shmseg->shm_perm, IPC_M); + error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M); if (error) { shmctl_ret = error; goto shmctl_out; @@ -495,30 +615,31 @@ shmctl(__unused struct proc *p, struct shmctl_args *uap, register_t *retval) if (IS_64BIT_PROCESS(p)) { error = copyin(uap->buf, &inbuf, sizeof(struct user_shmid_ds)); } else { - error = copyin(uap->buf, &inbuf, sizeof(struct shmid_ds)); + struct user32_shmid_ds shmid_ds32; + error = copyin(uap->buf, &shmid_ds32, sizeof(shmid_ds32)); /* convert in place; ugly, but safe */ - shmid_ds_32to64((struct shmid_ds *)&inbuf, &inbuf); + shmid_ds_32to64(&shmid_ds32, &inbuf); } if (error) { shmctl_ret = error; goto shmctl_out; } - 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) | + 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 = sysv_shmtime(); + shmseg->u.shm_ctime = sysv_shmtime(); break; case IPC_RMID: - error = ipcperm(cred, &shmseg->shm_perm, IPC_M); + error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M); if (error) { shmctl_ret = error; goto shmctl_out; } - shmseg->shm_perm.key = IPC_PRIVATE; - shmseg->shm_perm.mode |= SHMSEG_REMOVED; - if (shmseg->shm_nattch <= 0) { + 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); } @@ -541,30 +662,47 @@ shmctl_out: static int shmget_existing(struct shmget_args *uap, int mode, int segnum, int *retval) { - struct user_shmid_ds *shmseg; - 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) return error; return EAGAIN; } - error = ipcperm(kauth_cred_get(), &shmseg->shm_perm, mode); - if (error) - return error; - if (uap->size && uap->size > shmseg->shm_segsz) + + /* + * 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); +#endif + + if (uap->size && uap->size > shmseg->u.shm_segsz) return EINVAL; + 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; } @@ -572,25 +710,26 @@ static int shmget_allocate_segment(struct proc *p, struct shmget_args *uap, int mode, int *retval) { - int i, segnum, shmid, size; + int i, segnum, shmid; kauth_cred_t cred = kauth_cred_get(); - struct user_shmid_ds *shmseg; + 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 < (user_size_t)shminfo.shmmin || uap->size > (user_size_t)shminfo.shmmax) return EINVAL; if (shm_nused >= shminfo.shmmni) /* any shmids left? */ return ENOSPC; - size = mach_vm_round_page(uap->size); - if (shm_committed + btoc(size) > shminfo.shmall) + total_size = mach_vm_round_page(uap->size); + 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) + if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE) break; if (i == shminfo.shmmni) panic("shmseg free count inconsistent"); @@ -600,60 +739,88 @@ shmget_allocate_segment(struct proc *p, struct shmget_args *uap, int mode, 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, VM_FLAGS_ANYWHERE); - if (kret != KERN_SUCCESS) - goto out; - - kret = mach_make_memory_entry (current_map(), &size, user_addr, - VM_PROT_DEFAULT, (mem_entry_name_port_t *)&mem_object, 0); - - if (kret != KERN_SUCCESS) - goto out; - - vm_deallocate(current_map(), user_addr, size); - - shmseg->shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED; - shmseg->shm_perm.key = uap->key; - shmseg->shm_perm.seq = (shmseg->shm_perm.seq + 1) & 0x7fff; - 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; + 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; } - shm_handle->shm_object = mem_object; - shmid = IXSEQ_TO_IPCID(segnum, shmseg->shm_perm); - shmseg->shm_internal = CAST_USER_ADDR_T(shm_handle); /* tunnel */ - shmseg->shm_perm.cuid = shmseg->shm_perm.uid = kauth_cred_getuid(cred); - shmseg->shm_perm.cgid = shmseg->shm_perm.gid = cred->cr_gid; - shmseg->shm_perm.mode = (shmseg->shm_perm.mode & SHMSEG_WANTED) | + shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm); + + 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 = sysv_shmtime(); + 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++; - AUDIT_ARG(svipc_perm, &shmseg->shm_perm); - 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: + 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((caddr_t) shm_handle, M_SHM); + } + shmseg->u.shm_internal = USER_ADDR_NULL; /* tunnel */ + } + switch (kret) { case KERN_INVALID_ADDRESS: case KERN_NO_SPACE: @@ -667,7 +834,7 @@ out: } int -shmget(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; @@ -677,8 +844,7 @@ shmget(struct proc *p, struct shmget_args *uap, register_t *retval) SYSV_SHM_SUBSYS_LOCK(); if (!shm_inited) { - shmget_ret = EINVAL; - goto shmget_out; + shminit(NULL); } mode = uap->shmflg & ACCESSPERMS; @@ -705,9 +871,29 @@ shmget_out: } -/* XXX actually varargs. */ +/* + * 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(struct proc *p, 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 */ @@ -731,8 +917,7 @@ shmfork(struct proc *p1, struct proc *p2) SYSV_SHM_SUBSYS_LOCK(); if (!shm_inited) { - shmfork_ret = 0; - goto shmfork_out; + shminit(NULL); } size = shminfo.shmseg * sizeof(struct shmmap_state); @@ -742,7 +927,7 @@ shmfork(struct proc *p1, struct proc *p2) 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++; + shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++; shmfork_ret = 0; goto shmfork_out; } @@ -764,6 +949,10 @@ shmexit(struct proc *p) SYSV_SHM_SUBSYS_LOCK(); for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) if (shmmap_s->shmid != -1) + /* + * XXX: Should the MAC framework enforce + * check here as well. + */ shm_delete_mapping(p, shmmap_s, 1); FREE((caddr_t)p->vm_shm, M_SHM); p->vm_shm = NULL; @@ -806,16 +995,19 @@ shminit(__unused void *dummy) * dictates this filed be a size_t, which is 64 bits when * running 64 bit binaries. */ - s = sizeof(struct user_shmid_ds) * shminfo.shmmni; + s = sizeof(struct shmid_kernel) * shminfo.shmmni; - MALLOC(shmsegs, struct user_shmid_ds *, s, M_SHM, M_WAITOK); + MALLOC(shmsegs, struct shmid_kernel *, s, M_SHM, M_WAITOK); if (shmsegs == NULL) { /* XXX fail safely: leave shared memory uninited */ return; } 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; @@ -844,35 +1036,32 @@ sysctl_shminfo(__unused struct sysctl_oid *oidp, void *arg1, { int error = 0; int sysctl_shminfo_ret = 0; + uint64_t saved_shmmax; error = SYSCTL_OUT(req, arg1, sizeof(int64_t)); if (error || req->newptr == USER_ADDR_NULL) 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(int64_t))) - != 0) { - sysctl_shminfo_ret = error; - goto sysctl_shminfo_out; - } - if (arg1 == &shminfo.shmmax) { - if (shminfo.shmmax & PAGE_MASK_64) { - shminfo.shmmax = (int64_t)-1; - sysctl_shminfo_ret = EINVAL; - goto sysctl_shminfo_out; - } - } + /* 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; - /* Initialize only when all values are set */ - if ((shminfo.shmmax != (int64_t)-1) && - (shminfo.shmmin != (int64_t)-1) && - (shminfo.shmmni != (int64_t)-1) && - (shminfo.shmseg != (int64_t)-1) && - (shminfo.shmall != (int64_t)-1)) { - shminit(NULL); + 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 = saved_shmmax; + sysctl_shminfo_ret = EINVAL; + goto sysctl_shminfo_out; } } sysctl_shminfo_ret = 0; @@ -888,27 +1077,25 @@ IPCS_shm_sysctl(__unused struct sysctl_oid *oidp, __unused void *arg1, int error; int cursor; union { - struct IPCS_command u32; + struct user32_IPCS_command u32; struct user_IPCS_command u64; } ipcs; - struct shmid_ds shmid_ds32; /* post conversion, 32 bit version */ + 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(); - int ipcs__shminfo_ret = 0; - SYSV_SHM_SUBSYS_LOCK(); if (!shm_inited) { - error = EINVAL; - goto ipcs_shm_sysctl_out; + shminit(NULL); } if (!IS_64BIT_PROCESS(p)) { - ipcs_sz = sizeof(struct IPCS_command); - shmid_ds_sz = sizeof(struct shmid_ds); + ipcs_sz = sizeof(struct user32_IPCS_command); + shmid_ds_sz = sizeof(struct user32_shmid_ds); } /* Copy in the command structure */ @@ -945,11 +1132,11 @@ IPCS_shm_sysctl(__unused struct sysctl_oid *oidp, __unused void *arg1, break; } if (ipcs.u64.ipcs_datalen != (int)shmid_ds_sz) { - error = ENOMEM; + error = EINVAL; break; } for( ; cursor < shminfo.shmmni; cursor++) { - if (shmsegs[cursor].shm_perm.mode & SHMSEG_ALLOCATED) + if (shmsegs[cursor].u.shm_perm.mode & SHMSEG_ALLOCATED) break; continue; } @@ -966,7 +1153,18 @@ IPCS_shm_sysctl(__unused struct sysctl_oid *oidp, __unused void *arg1, */ 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)); + + /* 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) { @@ -974,8 +1172,9 @@ IPCS_shm_sysctl(__unused struct sysctl_oid *oidp, __unused void *arg1, ipcs.u64.ipcs_cursor = cursor + 1; if (!IS_64BIT_PROCESS(p)) /* convert in place */ - ipcs.u32.ipcs_data = CAST_DOWN(void *,ipcs.u64.ipcs_data); - error = SYSCTL_OUT(req, &ipcs, ipcs_sz); + ipcs.u32.ipcs_data = CAST_DOWN_EXPLICIT(user32_addr_t,ipcs.u64.ipcs_data); + + error = SYSCTL_OUT(req, &ipcs, ipcs_sz); } break; @@ -988,26 +1187,29 @@ ipcs_shm_sysctl_out: 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, KSYSV_SHMMAX, shmmax, CTLTYPE_QUAD | CTLFLAG_RW, +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_SHMMIN, shmmin, CTLTYPE_QUAD | CTLFLAG_RW, +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_SHMMNI, shmmni, CTLTYPE_QUAD | CTLFLAG_RW, +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_SHMSEG, shmseg, CTLTYPE_QUAD | CTLFLAG_RW, +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_SHMALL, shmall, CTLTYPE_QUAD | CTLFLAG_RW, +SYSCTL_PROC(_kern_sysv, OID_AUTO, shmall, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &shminfo.shmall, 0, &sysctl_shminfo ,"Q","shmall"); -SYSCTL_NODE(_kern_sysv, OID_AUTO, ipcs, CTLFLAG_RW, 0, "SYSVIPCS"); +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, +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 */