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 _KERNEL 39 #include <sys/sem.h> 40 #include <sys/shm.h> 41 #include <sys/msg.h> 42 #undef _KERNEL 43 44 #include <assert.h> 45 #include <err.h> 46 #include <kvm.h> 47 #include <nlist.h> 48 #include <stddef.h> 49 50 #include "ipc.h" 51 52 int use_sysctl = 1; 53 struct semid_kernel *sema; 54 struct seminfo seminfo; 55 struct msginfo msginfo; 56 struct msqid_kernel *msqids; 57 struct shminfo shminfo; 58 struct shmid_kernel *shmsegs; 59 60 struct nlist symbols[] = { 61 { .n_name = "sema" }, 62 { .n_name = "seminfo" }, 63 { .n_name = "msginfo" }, 64 { .n_name = "msqids" }, 65 { .n_name = "shminfo" }, 66 { .n_name = "shmsegs" }, 67 { .n_name = NULL } 68 }; 69 70 #define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \ 71 X(shmmin, sizeof(u_long)) \ 72 X(shmmni, sizeof(u_long)) \ 73 X(shmseg, sizeof(u_long)) \ 74 X(shmall, sizeof(u_long)) 75 76 #define SEMINFO_XVEC X(semmni, sizeof(int)) \ 77 X(semmns, sizeof(int)) \ 78 X(semmnu, sizeof(int)) \ 79 X(semmsl, sizeof(int)) \ 80 X(semopm, sizeof(int)) \ 81 X(semume, sizeof(int)) \ 82 X(semusz, sizeof(int)) \ 83 X(semvmx, sizeof(int)) \ 84 X(semaem, sizeof(int)) 85 86 #define MSGINFO_XVEC X(msgmax, sizeof(int)) \ 87 X(msgmni, sizeof(int)) \ 88 X(msgmnb, sizeof(int)) \ 89 X(msgtql, sizeof(int)) \ 90 X(msgssz, sizeof(int)) \ 91 X(msgseg, sizeof(int)) 92 93 #define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) }, 94 #define TYPEC struct shminfo 95 static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } }; 96 #undef TYPEC 97 #define TYPEC struct seminfo 98 static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } }; 99 #undef TYPEC 100 #define TYPEC struct msginfo 101 static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } }; 102 #undef TYPEC 103 #undef X 104 105 kvm_t *kd; 106 107 void 108 sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr) 109 { 110 struct scgs_vector *xp; 111 size_t tsiz; 112 int rv; 113 114 for (xp = vecarr; xp->sysctl != NULL; xp++) { 115 assert(xp->offset <= size); 116 tsiz = xp->size; 117 rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset, 118 &tsiz, NULL, 0); 119 if (rv == -1) 120 err(1, "sysctlbyname: %s", xp->sysctl); 121 if (tsiz != xp->size) 122 errx(1, "%s size mismatch (expected %zu, got %zu)", 123 xp->sysctl, xp->size, tsiz); 124 } 125 } 126 127 void 128 kget(int idx, void *addr, size_t size) 129 { 130 const char *symn; /* symbol name */ 131 size_t tsiz; 132 int rv; 133 unsigned long kaddr; 134 const char *sym2sysctl[] = { /* symbol to sysctl name table */ 135 "kern.ipc.sema", 136 "kern.ipc.seminfo", 137 "kern.ipc.msginfo", 138 "kern.ipc.msqids", 139 "kern.ipc.shminfo", 140 "kern.ipc.shmsegs" }; 141 142 assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl)); 143 if (!use_sysctl) { 144 symn = symbols[idx].n_name; 145 if (*symn == '_') 146 symn++; 147 if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0) 148 errx(1, "symbol %s undefined", symn); 149 /* 150 * For some symbols, the value we retrieve is 151 * actually a pointer; since we want the actual value, 152 * we have to manually dereference it. 153 */ 154 switch (idx) { 155 case X_MSQIDS: 156 tsiz = sizeof(msqids); 157 rv = kvm_read(kd, symbols[idx].n_value, 158 &msqids, tsiz); 159 kaddr = (u_long)msqids; 160 break; 161 case X_SHMSEGS: 162 tsiz = sizeof(shmsegs); 163 rv = kvm_read(kd, symbols[idx].n_value, 164 &shmsegs, tsiz); 165 kaddr = (u_long)shmsegs; 166 break; 167 case X_SEMA: 168 tsiz = sizeof(sema); 169 rv = kvm_read(kd, symbols[idx].n_value, 170 &sema, tsiz); 171 kaddr = (u_long)sema; 172 break; 173 default: 174 rv = tsiz = 0; 175 kaddr = symbols[idx].n_value; 176 break; 177 } 178 if ((unsigned)rv != tsiz) 179 errx(1, "%s: %s", symn, kvm_geterr(kd)); 180 if ((unsigned)kvm_read(kd, kaddr, addr, size) != size) 181 errx(1, "%s: %s", symn, kvm_geterr(kd)); 182 } else { 183 switch (idx) { 184 case X_SHMINFO: 185 sysctlgatherstruct(addr, size, shminfo_scgsv); 186 break; 187 case X_SEMINFO: 188 sysctlgatherstruct(addr, size, seminfo_scgsv); 189 break; 190 case X_MSGINFO: 191 sysctlgatherstruct(addr, size, msginfo_scgsv); 192 break; 193 default: 194 tsiz = size; 195 rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz, 196 NULL, 0); 197 if (rv == -1) 198 err(1, "sysctlbyname: %s", sym2sysctl[idx]); 199 if (tsiz != size) 200 errx(1, "%s size mismatch " 201 "(expected %zu, got %zu)", 202 sym2sysctl[idx], size, tsiz); 203 break; 204 } 205 } 206 } 207