| 1 | /* $NetBSD: sysv_ipc_50.c,v 1.4 2015/12/03 00:28:55 pgoyette Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1998, 2007 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Charles M. Hannum. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/cdefs.h> |
| 33 | __KERNEL_RCSID(0, "$NetBSD: sysv_ipc_50.c,v 1.4 2015/12/03 00:28:55 pgoyette Exp $" ); |
| 34 | |
| 35 | #ifdef _KERNEL_OPT |
| 36 | #include "opt_sysv.h" |
| 37 | #include "opt_compat_netbsd.h" |
| 38 | #endif |
| 39 | |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/kernel.h> |
| 42 | #include <sys/proc.h> |
| 43 | #include <sys/ipc.h> |
| 44 | #ifdef SYSVMSG |
| 45 | #include <sys/msg.h> |
| 46 | #endif |
| 47 | #ifdef SYSVSEM |
| 48 | #include <sys/sem.h> |
| 49 | #endif |
| 50 | #ifdef SYSVSHM |
| 51 | #include <sys/shm.h> |
| 52 | #endif |
| 53 | #include <sys/systm.h> |
| 54 | #include <sys/malloc.h> |
| 55 | #include <sys/mount.h> |
| 56 | #include <sys/vnode.h> |
| 57 | #include <sys/stat.h> |
| 58 | #include <sys/sysctl.h> |
| 59 | #include <sys/kauth.h> |
| 60 | |
| 61 | #ifdef COMPAT_50 |
| 62 | #include <compat/sys/ipc.h> |
| 63 | #ifdef SYSVMSG |
| 64 | #include <compat/sys/msg.h> |
| 65 | #endif |
| 66 | #ifdef SYSVSEM |
| 67 | #include <compat/sys/sem.h> |
| 68 | #endif |
| 69 | #ifdef SYSVSHM |
| 70 | #include <compat/sys/shm.h> |
| 71 | #endif |
| 72 | |
| 73 | /* |
| 74 | * Check for ipc permission |
| 75 | */ |
| 76 | |
| 77 | int sysctl_kern_sysvipc50(SYSCTLFN_PROTO); |
| 78 | |
| 79 | int |
| 80 | sysctl_kern_sysvipc50(SYSCTLFN_ARGS) |
| 81 | { |
| 82 | void *where = oldp; |
| 83 | size_t *sizep = oldlenp; |
| 84 | #ifdef SYSVMSG |
| 85 | struct msg_sysctl_info50 *msgsi = NULL; |
| 86 | #endif |
| 87 | #ifdef SYSVSEM |
| 88 | struct sem_sysctl_info50 *semsi = NULL; |
| 89 | #endif |
| 90 | #ifdef SYSVSHM |
| 91 | struct shm_sysctl_info50 *shmsi = NULL; |
| 92 | #endif |
| 93 | size_t infosize, dssize, tsize, buflen; |
| 94 | void *bf = NULL; |
| 95 | char *start; |
| 96 | int32_t nds; |
| 97 | int i, error, ret; |
| 98 | |
| 99 | if (namelen != 1) |
| 100 | return EINVAL; |
| 101 | |
| 102 | start = where; |
| 103 | buflen = *sizep; |
| 104 | |
| 105 | switch (*name) { |
| 106 | case KERN_SYSVIPC_OMSG_INFO: |
| 107 | #ifdef SYSVMSG |
| 108 | infosize = sizeof(msgsi->msginfo); |
| 109 | nds = msginfo.msgmni; |
| 110 | dssize = sizeof(msgsi->msgids[0]); |
| 111 | break; |
| 112 | #else |
| 113 | return EINVAL; |
| 114 | #endif |
| 115 | case KERN_SYSVIPC_OSEM_INFO: |
| 116 | #ifdef SYSVSEM |
| 117 | infosize = sizeof(semsi->seminfo); |
| 118 | nds = seminfo.semmni; |
| 119 | dssize = sizeof(semsi->semids[0]); |
| 120 | break; |
| 121 | #else |
| 122 | return EINVAL; |
| 123 | #endif |
| 124 | case KERN_SYSVIPC_OSHM_INFO: |
| 125 | #ifdef SYSVSHM |
| 126 | infosize = sizeof(shmsi->shminfo); |
| 127 | nds = shminfo.shmmni; |
| 128 | dssize = sizeof(shmsi->shmids[0]); |
| 129 | break; |
| 130 | #else |
| 131 | return EINVAL; |
| 132 | #endif |
| 133 | default: |
| 134 | return EPASSTHROUGH; |
| 135 | } |
| 136 | /* |
| 137 | * Round infosize to 64 bit boundary if requesting more than just |
| 138 | * the info structure or getting the total data size. |
| 139 | */ |
| 140 | if (where == NULL || *sizep > infosize) |
| 141 | infosize = roundup(infosize, sizeof(quad_t)); |
| 142 | tsize = infosize + nds * dssize; |
| 143 | |
| 144 | /* Return just the total size required. */ |
| 145 | if (where == NULL) { |
| 146 | *sizep = tsize; |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | /* Not enough room for even the info struct. */ |
| 151 | if (buflen < infosize) { |
| 152 | *sizep = 0; |
| 153 | return ENOMEM; |
| 154 | } |
| 155 | bf = malloc(min(tsize, buflen), M_TEMP, M_WAITOK | M_ZERO); |
| 156 | |
| 157 | switch (*name) { |
| 158 | #ifdef SYSVMSG |
| 159 | case KERN_SYSVIPC_OMSG_INFO: |
| 160 | msgsi = (struct msg_sysctl_info50 *)bf; |
| 161 | msgsi->msginfo = msginfo; |
| 162 | break; |
| 163 | #endif |
| 164 | #ifdef SYSVSEM |
| 165 | case KERN_SYSVIPC_OSEM_INFO: |
| 166 | semsi = (struct sem_sysctl_info50 *)bf; |
| 167 | semsi->seminfo = seminfo; |
| 168 | break; |
| 169 | #endif |
| 170 | #ifdef SYSVSHM |
| 171 | case KERN_SYSVIPC_OSHM_INFO: |
| 172 | shmsi = (struct shm_sysctl_info50 *)bf; |
| 173 | shmsi->shminfo = shminfo; |
| 174 | break; |
| 175 | #endif |
| 176 | } |
| 177 | buflen -= infosize; |
| 178 | |
| 179 | ret = 0; |
| 180 | if (buflen > 0) { |
| 181 | /* Fill in the IPC data structures. */ |
| 182 | for (i = 0; i < nds; i++) { |
| 183 | if (buflen < dssize) { |
| 184 | ret = ENOMEM; |
| 185 | break; |
| 186 | } |
| 187 | switch (*name) { |
| 188 | #ifdef SYSVMSG |
| 189 | case KERN_SYSVIPC_OMSG_INFO: |
| 190 | mutex_enter(&msgmutex); |
| 191 | SYSCTL_FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]); |
| 192 | mutex_exit(&msgmutex); |
| 193 | break; |
| 194 | #endif |
| 195 | #ifdef SYSVSEM |
| 196 | case KERN_SYSVIPC_OSEM_INFO: |
| 197 | SYSCTL_FILL_SEM(sema[i], semsi->semids[i]); |
| 198 | break; |
| 199 | #endif |
| 200 | #ifdef SYSVSHM |
| 201 | case KERN_SYSVIPC_OSHM_INFO: |
| 202 | SYSCTL_FILL_SHM(shmsegs[i], shmsi->shmids[i]); |
| 203 | break; |
| 204 | #endif |
| 205 | } |
| 206 | buflen -= dssize; |
| 207 | } |
| 208 | } |
| 209 | *sizep -= buflen; |
| 210 | error = copyout(bf, start, *sizep); |
| 211 | /* If copyout succeeded, use return code set earlier. */ |
| 212 | if (error == 0) |
| 213 | error = ret; |
| 214 | if (bf) |
| 215 | free(bf, M_TEMP); |
| 216 | return error; |
| 217 | } |
| 218 | #endif /* COMPAT_50 */ |
| 219 | |