sysv_ipc.c revision 1.15.32.3
1 1.15.32.3 yamt /* $NetBSD: sysv_ipc.c,v 1.15.32.3 2007/02/26 09:11:18 yamt Exp $ */ 2 1.7 cgd 3 1.13 mycroft /*- 4 1.15.32.3 yamt * Copyright (c) 1998, 2007 The NetBSD Foundation, Inc. 5 1.13 mycroft * All rights reserved. 6 1.13 mycroft * 7 1.13 mycroft * This code is derived from software contributed to The NetBSD Foundation 8 1.13 mycroft * by Charles M. Hannum. 9 1.1 cgd * 10 1.1 cgd * Redistribution and use in source and binary forms, with or without 11 1.1 cgd * modification, are permitted provided that the following conditions 12 1.1 cgd * are met: 13 1.1 cgd * 1. Redistributions of source code must retain the above copyright 14 1.1 cgd * notice, this list of conditions and the following disclaimer. 15 1.6 hpeyerl * 2. Redistributions in binary form must reproduce the above copyright 16 1.6 hpeyerl * notice, this list of conditions and the following disclaimer in the 17 1.6 hpeyerl * documentation and/or other materials provided with the distribution. 18 1.6 hpeyerl * 3. All advertising materials mentioning features or use of this software 19 1.6 hpeyerl * must display the following acknowledgement: 20 1.14 christos * This product includes software developed by the NetBSD 21 1.14 christos * Foundation, Inc. and its contributors. 22 1.13 mycroft * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.13 mycroft * contributors may be used to endorse or promote products derived 24 1.13 mycroft * from this software without specific prior written permission. 25 1.1 cgd * 26 1.13 mycroft * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.13 mycroft * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.13 mycroft * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.13 mycroft * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.13 mycroft * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.13 mycroft * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.13 mycroft * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.13 mycroft * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.13 mycroft * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.13 mycroft * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.13 mycroft * POSSIBILITY OF SUCH DAMAGE. 37 1.1 cgd */ 38 1.15 lukem 39 1.15 lukem #include <sys/cdefs.h> 40 1.15.32.3 yamt __KERNEL_RCSID(0, "$NetBSD: sysv_ipc.c,v 1.15.32.3 2007/02/26 09:11:18 yamt Exp $"); 41 1.15.32.2 yamt 42 1.15.32.2 yamt #include "opt_sysv.h" 43 1.1 cgd 44 1.2 mycroft #include <sys/param.h> 45 1.2 mycroft #include <sys/kernel.h> 46 1.2 mycroft #include <sys/proc.h> 47 1.2 mycroft #include <sys/ipc.h> 48 1.15.32.2 yamt #ifdef SYSVMSG 49 1.15.32.2 yamt #include <sys/msg.h> 50 1.15.32.2 yamt #endif 51 1.15.32.2 yamt #ifdef SYSVSEM 52 1.15.32.2 yamt #include <sys/sem.h> 53 1.15.32.2 yamt #endif 54 1.15.32.2 yamt #ifdef SYSVSHM 55 1.15.32.2 yamt #include <sys/shm.h> 56 1.15.32.2 yamt #endif 57 1.4 hpeyerl #include <sys/systm.h> 58 1.15.32.2 yamt #include <sys/malloc.h> 59 1.10 mycroft #include <sys/mount.h> 60 1.10 mycroft #include <sys/vnode.h> 61 1.12 mycroft #include <sys/stat.h> 62 1.15.32.2 yamt #include <sys/sysctl.h> 63 1.15.32.1 yamt #include <sys/kauth.h> 64 1.1 cgd 65 1.1 cgd /* 66 1.4 hpeyerl * Check for ipc permission 67 1.1 cgd */ 68 1.1 cgd 69 1.4 hpeyerl int 70 1.15.32.1 yamt ipcperm(kauth_cred_t cred, struct ipc_perm *perm, int mode) 71 1.1 cgd { 72 1.12 mycroft mode_t mask; 73 1.15.32.1 yamt int ismember = 0; 74 1.12 mycroft 75 1.15.32.3 yamt if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) == 0) 76 1.12 mycroft return (0); 77 1.1 cgd 78 1.9 mycroft if (mode == IPC_M) { 79 1.15.32.1 yamt if (kauth_cred_geteuid(cred) == perm->uid || 80 1.15.32.1 yamt kauth_cred_geteuid(cred) == perm->cuid) 81 1.9 mycroft return (0); 82 1.9 mycroft return (EPERM); 83 1.1 cgd } 84 1.4 hpeyerl 85 1.12 mycroft mask = 0; 86 1.12 mycroft 87 1.15.32.1 yamt if (kauth_cred_geteuid(cred) == perm->uid || 88 1.15.32.1 yamt kauth_cred_geteuid(cred) == perm->cuid) { 89 1.12 mycroft if (mode & IPC_R) 90 1.12 mycroft mask |= S_IRUSR; 91 1.12 mycroft if (mode & IPC_W) 92 1.12 mycroft mask |= S_IWUSR; 93 1.12 mycroft return ((perm->mode & mask) == mask ? 0 : EACCES); 94 1.12 mycroft } 95 1.12 mycroft 96 1.15.32.1 yamt if (kauth_cred_getegid(cred) == perm->gid || 97 1.15.32.1 yamt (kauth_cred_ismember_gid(cred, perm->gid, &ismember) == 0 && ismember) || 98 1.15.32.1 yamt kauth_cred_getegid(cred) == perm->cgid || 99 1.15.32.1 yamt (kauth_cred_ismember_gid(cred, perm->cgid, &ismember) == 0 && ismember)) { 100 1.12 mycroft if (mode & IPC_R) 101 1.12 mycroft mask |= S_IRGRP; 102 1.12 mycroft if (mode & IPC_W) 103 1.12 mycroft mask |= S_IWGRP; 104 1.12 mycroft return ((perm->mode & mask) == mask ? 0 : EACCES); 105 1.12 mycroft } 106 1.12 mycroft 107 1.12 mycroft if (mode & IPC_R) 108 1.12 mycroft mask |= S_IROTH; 109 1.12 mycroft if (mode & IPC_W) 110 1.12 mycroft mask |= S_IWOTH; 111 1.12 mycroft return ((perm->mode & mask) == mask ? 0 : EACCES); 112 1.1 cgd } 113 1.15.32.2 yamt 114 1.15.32.2 yamt /* 115 1.15.32.2 yamt * sysctl helper routine for kern.ipc.sysvipc_info subtree. 116 1.15.32.2 yamt */ 117 1.15.32.2 yamt 118 1.15.32.2 yamt #define FILL_PERM(src, dst) do { \ 119 1.15.32.2 yamt (dst)._key = (src)._key; \ 120 1.15.32.2 yamt (dst).uid = (src).uid; \ 121 1.15.32.2 yamt (dst).gid = (src).gid; \ 122 1.15.32.2 yamt (dst).cuid = (src).cuid; \ 123 1.15.32.2 yamt (dst).cgid = (src).cgid; \ 124 1.15.32.2 yamt (dst).mode = (src).mode; \ 125 1.15.32.2 yamt (dst)._seq = (src)._seq; \ 126 1.15.32.2 yamt } while (/*CONSTCOND*/ 0); 127 1.15.32.2 yamt 128 1.15.32.2 yamt #define FILL_MSG(src, dst) do { \ 129 1.15.32.2 yamt FILL_PERM((src).msg_perm, (dst).msg_perm); \ 130 1.15.32.2 yamt (dst).msg_qnum = (src).msg_qnum; \ 131 1.15.32.2 yamt (dst).msg_qbytes = (src).msg_qbytes; \ 132 1.15.32.2 yamt (dst)._msg_cbytes = (src)._msg_cbytes; \ 133 1.15.32.2 yamt (dst).msg_lspid = (src).msg_lspid; \ 134 1.15.32.2 yamt (dst).msg_lrpid = (src).msg_lrpid; \ 135 1.15.32.2 yamt (dst).msg_stime = (src).msg_stime; \ 136 1.15.32.2 yamt (dst).msg_rtime = (src).msg_rtime; \ 137 1.15.32.2 yamt (dst).msg_ctime = (src).msg_ctime; \ 138 1.15.32.2 yamt } while (/*CONSTCOND*/ 0) 139 1.15.32.2 yamt 140 1.15.32.2 yamt #define FILL_SEM(src, dst) do { \ 141 1.15.32.2 yamt FILL_PERM((src).sem_perm, (dst).sem_perm); \ 142 1.15.32.2 yamt (dst).sem_nsems = (src).sem_nsems; \ 143 1.15.32.2 yamt (dst).sem_otime = (src).sem_otime; \ 144 1.15.32.2 yamt (dst).sem_ctime = (src).sem_ctime; \ 145 1.15.32.2 yamt } while (/*CONSTCOND*/ 0) 146 1.15.32.2 yamt 147 1.15.32.2 yamt #define FILL_SHM(src, dst) do { \ 148 1.15.32.2 yamt FILL_PERM((src).shm_perm, (dst).shm_perm); \ 149 1.15.32.2 yamt (dst).shm_segsz = (src).shm_segsz; \ 150 1.15.32.2 yamt (dst).shm_lpid = (src).shm_lpid; \ 151 1.15.32.2 yamt (dst).shm_cpid = (src).shm_cpid; \ 152 1.15.32.2 yamt (dst).shm_atime = (src).shm_atime; \ 153 1.15.32.2 yamt (dst).shm_dtime = (src).shm_dtime; \ 154 1.15.32.2 yamt (dst).shm_ctime = (src).shm_ctime; \ 155 1.15.32.2 yamt (dst).shm_nattch = (src).shm_nattch; \ 156 1.15.32.2 yamt } while (/*CONSTCOND*/ 0) 157 1.15.32.2 yamt 158 1.15.32.2 yamt static int 159 1.15.32.2 yamt sysctl_kern_sysvipc(SYSCTLFN_ARGS) 160 1.15.32.2 yamt { 161 1.15.32.2 yamt void *where = oldp; 162 1.15.32.2 yamt size_t *sizep = oldlenp; 163 1.15.32.2 yamt #ifdef SYSVMSG 164 1.15.32.2 yamt struct msg_sysctl_info *msgsi = NULL; 165 1.15.32.2 yamt #endif 166 1.15.32.2 yamt #ifdef SYSVSEM 167 1.15.32.2 yamt struct sem_sysctl_info *semsi = NULL; 168 1.15.32.2 yamt #endif 169 1.15.32.2 yamt #ifdef SYSVSHM 170 1.15.32.2 yamt struct shm_sysctl_info *shmsi = NULL; 171 1.15.32.2 yamt #endif 172 1.15.32.2 yamt size_t infosize, dssize, tsize, buflen; 173 1.15.32.2 yamt void *bf = NULL; 174 1.15.32.2 yamt char *start; 175 1.15.32.2 yamt int32_t nds; 176 1.15.32.2 yamt int i, error, ret; 177 1.15.32.2 yamt 178 1.15.32.2 yamt if (namelen != 1) 179 1.15.32.2 yamt return EINVAL; 180 1.15.32.2 yamt 181 1.15.32.2 yamt start = where; 182 1.15.32.2 yamt buflen = *sizep; 183 1.15.32.2 yamt 184 1.15.32.2 yamt switch (*name) { 185 1.15.32.2 yamt case KERN_SYSVIPC_MSG_INFO: 186 1.15.32.2 yamt #ifdef SYSVMSG 187 1.15.32.2 yamt infosize = sizeof(msgsi->msginfo); 188 1.15.32.2 yamt nds = msginfo.msgmni; 189 1.15.32.2 yamt dssize = sizeof(msgsi->msgids[0]); 190 1.15.32.2 yamt break; 191 1.15.32.2 yamt #else 192 1.15.32.2 yamt return EINVAL; 193 1.15.32.2 yamt #endif 194 1.15.32.2 yamt case KERN_SYSVIPC_SEM_INFO: 195 1.15.32.2 yamt #ifdef SYSVSEM 196 1.15.32.2 yamt infosize = sizeof(semsi->seminfo); 197 1.15.32.2 yamt nds = seminfo.semmni; 198 1.15.32.2 yamt dssize = sizeof(semsi->semids[0]); 199 1.15.32.2 yamt break; 200 1.15.32.2 yamt #else 201 1.15.32.2 yamt return EINVAL; 202 1.15.32.2 yamt #endif 203 1.15.32.2 yamt case KERN_SYSVIPC_SHM_INFO: 204 1.15.32.2 yamt #ifdef SYSVSHM 205 1.15.32.2 yamt infosize = sizeof(shmsi->shminfo); 206 1.15.32.2 yamt nds = shminfo.shmmni; 207 1.15.32.2 yamt dssize = sizeof(shmsi->shmids[0]); 208 1.15.32.2 yamt break; 209 1.15.32.2 yamt #else 210 1.15.32.2 yamt return EINVAL; 211 1.15.32.2 yamt #endif 212 1.15.32.2 yamt default: 213 1.15.32.2 yamt return EINVAL; 214 1.15.32.2 yamt } 215 1.15.32.2 yamt /* 216 1.15.32.2 yamt * Round infosize to 64 bit boundary if requesting more than just 217 1.15.32.2 yamt * the info structure or getting the total data size. 218 1.15.32.2 yamt */ 219 1.15.32.2 yamt if (where == NULL || *sizep > infosize) 220 1.15.32.2 yamt infosize = roundup(infosize, sizeof(quad_t)); 221 1.15.32.2 yamt tsize = infosize + nds * dssize; 222 1.15.32.2 yamt 223 1.15.32.2 yamt /* Return just the total size required. */ 224 1.15.32.2 yamt if (where == NULL) { 225 1.15.32.2 yamt *sizep = tsize; 226 1.15.32.2 yamt return 0; 227 1.15.32.2 yamt } 228 1.15.32.2 yamt 229 1.15.32.2 yamt /* Not enough room for even the info struct. */ 230 1.15.32.2 yamt if (buflen < infosize) { 231 1.15.32.2 yamt *sizep = 0; 232 1.15.32.2 yamt return ENOMEM; 233 1.15.32.2 yamt } 234 1.15.32.2 yamt bf = malloc(min(tsize, buflen), M_TEMP, M_WAITOK | M_ZERO); 235 1.15.32.2 yamt 236 1.15.32.2 yamt switch (*name) { 237 1.15.32.2 yamt #ifdef SYSVMSG 238 1.15.32.2 yamt case KERN_SYSVIPC_MSG_INFO: 239 1.15.32.2 yamt msgsi = (struct msg_sysctl_info *)bf; 240 1.15.32.2 yamt msgsi->msginfo = msginfo; 241 1.15.32.2 yamt break; 242 1.15.32.2 yamt #endif 243 1.15.32.2 yamt #ifdef SYSVSEM 244 1.15.32.2 yamt case KERN_SYSVIPC_SEM_INFO: 245 1.15.32.2 yamt semsi = (struct sem_sysctl_info *)bf; 246 1.15.32.2 yamt semsi->seminfo = seminfo; 247 1.15.32.2 yamt break; 248 1.15.32.2 yamt #endif 249 1.15.32.2 yamt #ifdef SYSVSHM 250 1.15.32.2 yamt case KERN_SYSVIPC_SHM_INFO: 251 1.15.32.2 yamt shmsi = (struct shm_sysctl_info *)bf; 252 1.15.32.2 yamt shmsi->shminfo = shminfo; 253 1.15.32.2 yamt break; 254 1.15.32.2 yamt #endif 255 1.15.32.2 yamt } 256 1.15.32.2 yamt buflen -= infosize; 257 1.15.32.2 yamt 258 1.15.32.2 yamt ret = 0; 259 1.15.32.2 yamt if (buflen > 0) { 260 1.15.32.2 yamt /* Fill in the IPC data structures. */ 261 1.15.32.2 yamt for (i = 0; i < nds; i++) { 262 1.15.32.2 yamt if (buflen < dssize) { 263 1.15.32.2 yamt ret = ENOMEM; 264 1.15.32.2 yamt break; 265 1.15.32.2 yamt } 266 1.15.32.2 yamt switch (*name) { 267 1.15.32.2 yamt #ifdef SYSVMSG 268 1.15.32.2 yamt case KERN_SYSVIPC_MSG_INFO: 269 1.15.32.3 yamt mutex_enter(&msgmutex); 270 1.15.32.3 yamt FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]); 271 1.15.32.3 yamt mutex_exit(&msgmutex); 272 1.15.32.2 yamt break; 273 1.15.32.2 yamt #endif 274 1.15.32.2 yamt #ifdef SYSVSEM 275 1.15.32.2 yamt case KERN_SYSVIPC_SEM_INFO: 276 1.15.32.2 yamt FILL_SEM(sema[i], semsi->semids[i]); 277 1.15.32.2 yamt break; 278 1.15.32.2 yamt #endif 279 1.15.32.2 yamt #ifdef SYSVSHM 280 1.15.32.2 yamt case KERN_SYSVIPC_SHM_INFO: 281 1.15.32.2 yamt FILL_SHM(shmsegs[i], shmsi->shmids[i]); 282 1.15.32.2 yamt break; 283 1.15.32.2 yamt #endif 284 1.15.32.2 yamt } 285 1.15.32.2 yamt buflen -= dssize; 286 1.15.32.2 yamt } 287 1.15.32.2 yamt } 288 1.15.32.2 yamt *sizep -= buflen; 289 1.15.32.2 yamt error = copyout(bf, start, *sizep); 290 1.15.32.2 yamt /* If copyout succeeded, use return code set earlier. */ 291 1.15.32.2 yamt if (error == 0) 292 1.15.32.2 yamt error = ret; 293 1.15.32.2 yamt if (bf) 294 1.15.32.2 yamt free(bf, M_TEMP); 295 1.15.32.2 yamt return error; 296 1.15.32.2 yamt } 297 1.15.32.2 yamt 298 1.15.32.2 yamt #undef FILL_PERM 299 1.15.32.2 yamt #undef FILL_MSG 300 1.15.32.2 yamt #undef FILL_SEM 301 1.15.32.2 yamt #undef FILL_SHM 302 1.15.32.2 yamt 303 1.15.32.2 yamt SYSCTL_SETUP(sysctl_ipc_setup, "sysctl kern.ipc subtree setup") 304 1.15.32.2 yamt { 305 1.15.32.2 yamt sysctl_createv(clog, 0, NULL, NULL, 306 1.15.32.2 yamt CTLFLAG_PERMANENT, 307 1.15.32.2 yamt CTLTYPE_NODE, "kern", NULL, 308 1.15.32.2 yamt NULL, 0, NULL, 0, 309 1.15.32.2 yamt CTL_KERN, CTL_EOL); 310 1.15.32.2 yamt 311 1.15.32.2 yamt sysctl_createv(clog, 0, NULL, NULL, 312 1.15.32.2 yamt CTLFLAG_PERMANENT, 313 1.15.32.2 yamt CTLTYPE_NODE, "ipc", 314 1.15.32.2 yamt SYSCTL_DESCR("SysV IPC options"), 315 1.15.32.2 yamt NULL, 0, NULL, 0, 316 1.15.32.2 yamt CTL_KERN, KERN_SYSVIPC, CTL_EOL); 317 1.15.32.2 yamt 318 1.15.32.2 yamt sysctl_createv(clog, 0, NULL, NULL, 319 1.15.32.2 yamt CTLFLAG_PERMANENT, 320 1.15.32.2 yamt CTLTYPE_STRUCT, "sysvipc_info", 321 1.15.32.2 yamt SYSCTL_DESCR("System V style IPC information"), 322 1.15.32.2 yamt sysctl_kern_sysvipc, 0, NULL, 0, 323 1.15.32.2 yamt CTL_KERN, KERN_SYSVIPC, KERN_SYSVIPC_INFO, CTL_EOL); 324 1.15.32.2 yamt } 325
Indexes created Wed Sep 24 15:09:51 GMT 2025