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/types.h> 34 #include <sys/sysctl.h> 35 #define _WANT_SYSVMSG_INTERNALS 36 #include <sys/msg.h> 37 #define _WANT_SYSVSEM_INTERNALS 38 #include <sys/sem.h> 39 #define _WANT_SYSVSHM_INTERNALS 40 #include <sys/shm.h> 41 42 #include <assert.h> 43 #include <err.h> 44 #include <kvm.h> 45 #include <nlist.h> 46 #include <stddef.h> 47 48 #include "ipc.h" 49 50 int use_sysctl = 1; 51 struct semid_kernel *sema; 52 struct seminfo seminfo; 53 struct msginfo msginfo; 54 struct msqid_kernel *msqids; 55 struct shminfo shminfo; 56 struct shmid_kernel *shmsegs; 57 58 struct nlist symbols[] = { 59 { .n_name = "sema" }, 60 { .n_name = "seminfo" }, 61 { .n_name = "msginfo" }, 62 { .n_name = "msqids" }, 63 { .n_name = "shminfo" }, 64 { .n_name = "shmsegs" }, 65 { .n_name = NULL } 66 }; 67 68 #define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \ 69 X(shmmin, sizeof(u_long)) \ 70 X(shmmni, sizeof(u_long)) \ 71 X(shmseg, sizeof(u_long)) \ 72 X(shmall, sizeof(u_long)) 73 74 #define SEMINFO_XVEC X(semmni, sizeof(int)) \ 75 X(semmns, sizeof(int)) \ 76 X(semmnu, sizeof(int)) \ 77 X(semmsl, sizeof(int)) \ 78 X(semopm, sizeof(int)) \ 79 X(semume, sizeof(int)) \ 80 X(semusz, sizeof(int)) \ 81 X(semvmx, sizeof(int)) \ 82 X(semaem, sizeof(int)) 83 84 #define MSGINFO_XVEC X(msgmax, sizeof(int)) \ 85 X(msgmni, sizeof(int)) \ 86 X(msgmnb, sizeof(int)) \ 87 X(msgtql, sizeof(int)) \ 88 X(msgssz, sizeof(int)) \ 89 X(msgseg, sizeof(int)) 90 91 #define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) }, 92 #define TYPEC struct shminfo 93 static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } }; 94 #undef TYPEC 95 #define TYPEC struct seminfo 96 static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } }; 97 #undef TYPEC 98 #define TYPEC struct msginfo 99 static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } }; 100 #undef TYPEC 101 #undef X 102 103 kvm_t *kd; 104 105 void 106 sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr) 107 { 108 struct scgs_vector *xp; 109 size_t tsiz; 110 int rv; 111 112 for (xp = vecarr; xp->sysctl != NULL; xp++) { 113 assert(xp->offset <= size); 114 tsiz = xp->size; 115 rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset, 116 &tsiz, NULL, 0); 117 if (rv == -1) 118 err(1, "sysctlbyname: %s", xp->sysctl); 119 if (tsiz != xp->size) 120 errx(1, "%s size mismatch (expected %zu, got %zu)", 121 xp->sysctl, xp->size, tsiz); 122 } 123 } 124 125 void 126 kget(int idx, void *addr, size_t size) 127 { 128 const char *symn; /* symbol name */ 129 size_t tsiz; 130 int rv; 131 unsigned long kaddr; 132 const char *sym2sysctl[] = { /* symbol to sysctl name table */ 133 "kern.ipc.sema", 134 "kern.ipc.seminfo", 135 "kern.ipc.msginfo", 136 "kern.ipc.msqids", 137 "kern.ipc.shminfo", 138 "kern.ipc.shmsegs" }; 139 140 assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl)); 141 if (!use_sysctl) { 142 symn = symbols[idx].n_name; 143 if (*symn == '_') 144 symn++; 145 if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0) 146 errx(1, "symbol %s undefined", symn); 147 /* 148 * For some symbols, the value we retrieve is 149 * actually a pointer; since we want the actual value, 150 * we have to manually dereference it. 151 */ 152 switch (idx) { 153 case X_MSQIDS: 154 tsiz = sizeof(msqids); 155 rv = kvm_read(kd, symbols[idx].n_value, 156 &msqids, tsiz); 157 kaddr = (u_long)msqids; 158 break; 159 case X_SHMSEGS: 160 tsiz = sizeof(shmsegs); 161 rv = kvm_read(kd, symbols[idx].n_value, 162 &shmsegs, tsiz); 163 kaddr = (u_long)shmsegs; 164 break; 165 case X_SEMA: 166 tsiz = sizeof(sema); 167 rv = kvm_read(kd, symbols[idx].n_value, 168 &sema, tsiz); 169 kaddr = (u_long)sema; 170 break; 171 default: 172 rv = tsiz = 0; 173 kaddr = symbols[idx].n_value; 174 break; 175 } 176 if ((unsigned)rv != tsiz) 177 errx(1, "%s: %s", symn, kvm_geterr(kd)); 178 if ((unsigned)kvm_read(kd, kaddr, addr, size) != size) 179 errx(1, "%s: %s", symn, kvm_geterr(kd)); 180 } else { 181 switch (idx) { 182 case X_SHMINFO: 183 sysctlgatherstruct(addr, size, shminfo_scgsv); 184 break; 185 case X_SEMINFO: 186 sysctlgatherstruct(addr, size, seminfo_scgsv); 187 break; 188 case X_MSGINFO: 189 sysctlgatherstruct(addr, size, msginfo_scgsv); 190 break; 191 default: 192 tsiz = size; 193 rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz, 194 NULL, 0); 195 if (rv == -1) 196 err(1, "sysctlbyname: %s", sym2sysctl[idx]); 197 if (tsiz != size) 198 errx(1, "%s size mismatch " 199 "(expected %zu, got %zu)", 200 sym2sysctl[idx], size, tsiz); 201 break; 202 } 203 } 204 } 205