1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * The split of ipcs.c into ipcs.c and ipc.c to accommodate the 30 * changes in ipcrm.c was done by Edwin Groothuis <edwin@FreeBSD.org> 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/types.h> 37 #include <sys/sysctl.h> 38 #define _WANT_SYSVMSG_INTERNALS 39 #include <sys/msg.h> 40 #define _WANT_SYSVSEM_INTERNALS 41 #include <sys/sem.h> 42 #define _WANT_SYSVSHM_INTERNALS 43 #include <sys/shm.h> 44 45 #include <assert.h> 46 #include <err.h> 47 #include <kvm.h> 48 #include <nlist.h> 49 #include <stddef.h> 50 51 #include "ipc.h" 52 53 int use_sysctl = 1; 54 struct semid_kernel *sema; 55 struct seminfo seminfo; 56 struct msginfo msginfo; 57 struct msqid_kernel *msqids; 58 struct shminfo shminfo; 59 struct shmid_kernel *shmsegs; 60 61 struct nlist symbols[] = { 62 { .n_name = "sema" }, 63 { .n_name = "seminfo" }, 64 { .n_name = "msginfo" }, 65 { .n_name = "msqids" }, 66 { .n_name = "shminfo" }, 67 { .n_name = "shmsegs" }, 68 { .n_name = NULL } 69 }; 70 71 #define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \ 72 X(shmmin, sizeof(u_long)) \ 73 X(shmmni, sizeof(u_long)) \ 74 X(shmseg, sizeof(u_long)) \ 75 X(shmall, sizeof(u_long)) 76 77 #define SEMINFO_XVEC X(semmni, sizeof(int)) \ 78 X(semmns, sizeof(int)) \ 79 X(semmnu, sizeof(int)) \ 80 X(semmsl, sizeof(int)) \ 81 X(semopm, sizeof(int)) \ 82 X(semume, sizeof(int)) \ 83 X(semusz, sizeof(int)) \ 84 X(semvmx, sizeof(int)) \ 85 X(semaem, sizeof(int)) 86 87 #define MSGINFO_XVEC X(msgmax, sizeof(int)) \ 88 X(msgmni, sizeof(int)) \ 89 X(msgmnb, sizeof(int)) \ 90 X(msgtql, sizeof(int)) \ 91 X(msgssz, sizeof(int)) \ 92 X(msgseg, sizeof(int)) 93 94 #define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) }, 95 #define TYPEC struct shminfo 96 static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } }; 97 #undef TYPEC 98 #define TYPEC struct seminfo 99 static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } }; 100 #undef TYPEC 101 #define TYPEC struct msginfo 102 static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } }; 103 #undef TYPEC 104 #undef X 105 106 kvm_t *kd; 107 108 void 109 sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr) 110 { 111 struct scgs_vector *xp; 112 size_t tsiz; 113 int rv; 114 115 for (xp = vecarr; xp->sysctl != NULL; xp++) { 116 assert(xp->offset <= size); 117 tsiz = xp->size; 118 rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset, 119 &tsiz, NULL, 0); 120 if (rv == -1) 121 err(1, "sysctlbyname: %s", xp->sysctl); 122 if (tsiz != xp->size) 123 errx(1, "%s size mismatch (expected %zu, got %zu)", 124 xp->sysctl, xp->size, tsiz); 125 } 126 } 127 128 void 129 kget(int idx, void *addr, size_t size) 130 { 131 const char *symn; /* symbol name */ 132 size_t tsiz; 133 int rv; 134 unsigned long kaddr; 135 const char *sym2sysctl[] = { /* symbol to sysctl name table */ 136 "kern.ipc.sema", 137 "kern.ipc.seminfo", 138 "kern.ipc.msginfo", 139 "kern.ipc.msqids", 140 "kern.ipc.shminfo", 141 "kern.ipc.shmsegs" }; 142 143 assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl)); 144 if (!use_sysctl) { 145 symn = symbols[idx].n_name; 146 if (*symn == '_') 147 symn++; 148 if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0) 149 errx(1, "symbol %s undefined", symn); 150 /* 151 * For some symbols, the value we retrieve is 152 * actually a pointer; since we want the actual value, 153 * we have to manually dereference it. 154 */ 155 switch (idx) { 156 case X_MSQIDS: 157 tsiz = sizeof(msqids); 158 rv = kvm_read(kd, symbols[idx].n_value, 159 &msqids, tsiz); 160 kaddr = (u_long)msqids; 161 break; 162 case X_SHMSEGS: 163 tsiz = sizeof(shmsegs); 164 rv = kvm_read(kd, symbols[idx].n_value, 165 &shmsegs, tsiz); 166 kaddr = (u_long)shmsegs; 167 break; 168 case X_SEMA: 169 tsiz = sizeof(sema); 170 rv = kvm_read(kd, symbols[idx].n_value, 171 &sema, tsiz); 172 kaddr = (u_long)sema; 173 break; 174 default: 175 rv = tsiz = 0; 176 kaddr = symbols[idx].n_value; 177 break; 178 } 179 if ((unsigned)rv != tsiz) 180 errx(1, "%s: %s", symn, kvm_geterr(kd)); 181 if ((unsigned)kvm_read(kd, kaddr, addr, size) != size) 182 errx(1, "%s: %s", symn, kvm_geterr(kd)); 183 } else { 184 switch (idx) { 185 case X_SHMINFO: 186 sysctlgatherstruct(addr, size, shminfo_scgsv); 187 break; 188 case X_SEMINFO: 189 sysctlgatherstruct(addr, size, seminfo_scgsv); 190 break; 191 case X_MSGINFO: 192 sysctlgatherstruct(addr, size, msginfo_scgsv); 193 break; 194 default: 195 tsiz = size; 196 rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz, 197 NULL, 0); 198 if (rv == -1) 199 err(1, "sysctlbyname: %s", sym2sysctl[idx]); 200 if (tsiz != size) 201 errx(1, "%s size mismatch " 202 "(expected %zu, got %zu)", 203 sym2sysctl[idx], size, tsiz); 204 break; 205 } 206 } 207 } 208