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 #include <sys/types.h> 35 #include <sys/sysctl.h> 36 #define _WANT_SYSVMSG_INTERNALS 37 #include <sys/msg.h> 38 #define _WANT_SYSVSEM_INTERNALS 39 #include <sys/sem.h> 40 #define _WANT_SYSVSHM_INTERNALS 41 #include <sys/shm.h> 42 43 #include <assert.h> 44 #include <err.h> 45 #include <kvm.h> 46 #include <nlist.h> 47 #include <stddef.h> 48 49 #include "ipc.h" 50 51 int use_sysctl = 1; 52 struct semid_kernel *sema; 53 struct seminfo seminfo; 54 struct msginfo msginfo; 55 struct msqid_kernel *msqids; 56 struct shminfo shminfo; 57 struct shmid_kernel *shmsegs; 58 59 struct nlist symbols[] = { 60 { .n_name = "sema" }, 61 { .n_name = "seminfo" }, 62 { .n_name = "msginfo" }, 63 { .n_name = "msqids" }, 64 { .n_name = "shminfo" }, 65 { .n_name = "shmsegs" }, 66 { .n_name = NULL } 67 }; 68 69 #define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \ 70 X(shmmin, sizeof(u_long)) \ 71 X(shmmni, sizeof(u_long)) \ 72 X(shmseg, sizeof(u_long)) \ 73 X(shmall, sizeof(u_long)) 74 75 #define SEMINFO_XVEC X(semmni, sizeof(int)) \ 76 X(semmns, sizeof(int)) \ 77 X(semmnu, sizeof(int)) \ 78 X(semmsl, sizeof(int)) \ 79 X(semopm, sizeof(int)) \ 80 X(semume, sizeof(int)) \ 81 X(semusz, sizeof(int)) \ 82 X(semvmx, sizeof(int)) \ 83 X(semaem, sizeof(int)) 84 85 #define MSGINFO_XVEC X(msgmax, sizeof(int)) \ 86 X(msgmni, sizeof(int)) \ 87 X(msgmnb, sizeof(int)) \ 88 X(msgtql, sizeof(int)) \ 89 X(msgssz, sizeof(int)) \ 90 X(msgseg, sizeof(int)) 91 92 #define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) }, 93 #define TYPEC struct shminfo 94 static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } }; 95 #undef TYPEC 96 #define TYPEC struct seminfo 97 static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } }; 98 #undef TYPEC 99 #define TYPEC struct msginfo 100 static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } }; 101 #undef TYPEC 102 #undef X 103 104 kvm_t *kd; 105 106 void 107 sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr) 108 { 109 struct scgs_vector *xp; 110 size_t tsiz; 111 int rv; 112 113 for (xp = vecarr; xp->sysctl != NULL; xp++) { 114 assert(xp->offset <= size); 115 tsiz = xp->size; 116 rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset, 117 &tsiz, NULL, 0); 118 if (rv == -1) 119 err(1, "sysctlbyname: %s", xp->sysctl); 120 if (tsiz != xp->size) 121 errx(1, "%s size mismatch (expected %zu, got %zu)", 122 xp->sysctl, xp->size, tsiz); 123 } 124 } 125 126 void 127 kget(int idx, void *addr, size_t size) 128 { 129 const char *symn; /* symbol name */ 130 size_t tsiz; 131 int rv; 132 unsigned long kaddr; 133 const char *sym2sysctl[] = { /* symbol to sysctl name table */ 134 "kern.ipc.sema", 135 "kern.ipc.seminfo", 136 "kern.ipc.msginfo", 137 "kern.ipc.msqids", 138 "kern.ipc.shminfo", 139 "kern.ipc.shmsegs" }; 140 141 assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl)); 142 if (!use_sysctl) { 143 symn = symbols[idx].n_name; 144 if (*symn == '_') 145 symn++; 146 if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0) 147 errx(1, "symbol %s undefined", symn); 148 /* 149 * For some symbols, the value we retrieve is 150 * actually a pointer; since we want the actual value, 151 * we have to manually dereference it. 152 */ 153 switch (idx) { 154 case X_MSQIDS: 155 tsiz = sizeof(msqids); 156 rv = kvm_read(kd, symbols[idx].n_value, 157 &msqids, tsiz); 158 kaddr = (u_long)msqids; 159 break; 160 case X_SHMSEGS: 161 tsiz = sizeof(shmsegs); 162 rv = kvm_read(kd, symbols[idx].n_value, 163 &shmsegs, tsiz); 164 kaddr = (u_long)shmsegs; 165 break; 166 case X_SEMA: 167 tsiz = sizeof(sema); 168 rv = kvm_read(kd, symbols[idx].n_value, 169 &sema, tsiz); 170 kaddr = (u_long)sema; 171 break; 172 default: 173 rv = tsiz = 0; 174 kaddr = symbols[idx].n_value; 175 break; 176 } 177 if ((unsigned)rv != tsiz) 178 errx(1, "%s: %s", symn, kvm_geterr(kd)); 179 if ((unsigned)kvm_read(kd, kaddr, addr, size) != size) 180 errx(1, "%s: %s", symn, kvm_geterr(kd)); 181 } else { 182 switch (idx) { 183 case X_SHMINFO: 184 sysctlgatherstruct(addr, size, shminfo_scgsv); 185 break; 186 case X_SEMINFO: 187 sysctlgatherstruct(addr, size, seminfo_scgsv); 188 break; 189 case X_MSGINFO: 190 sysctlgatherstruct(addr, size, msginfo_scgsv); 191 break; 192 default: 193 tsiz = size; 194 rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz, 195 NULL, 0); 196 if (rv == -1) 197 err(1, "sysctlbyname: %s", sym2sysctl[idx]); 198 if (tsiz != size) 199 errx(1, "%s size mismatch " 200 "(expected %zu, got %zu)", 201 sym2sysctl[idx], size, tsiz); 202 break; 203 } 204 } 205 } 206