1/* $NetBSD: linux_ipccall.c,v 1.34 2021/09/23 06:56:27 ryo Exp $ */ 2 3/*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33__KERNEL_RCSID(0, "$NetBSD: linux_ipccall.c,v 1.34 2021/09/23 06:56:27 ryo Exp $"); 34 35#if defined(_KERNEL_OPT) 36#include "opt_sysv.h" 37#endif 38 39#include <sys/param.h> 40#include <sys/shm.h> 41#include <sys/sem.h> 42#include <sys/msg.h> 43#include <sys/proc.h> 44#include <sys/systm.h> 45 46/* real syscalls */ 47#include <sys/mount.h> 48#include <sys/syscallargs.h> 49 50/* sys_ipc + args prototype */ 51#include <compat/linux/common/linux_types.h> 52#include <compat/linux/common/linux_signal.h> 53 54#include <compat/linux/linux_syscallargs.h> 55#include <compat/linux/linux_syscall.h> 56 57/* general ipc defines */ 58#include <compat/linux/common/linux_ipc.h> 59 60/* prototypes for real/normal linux-emul syscalls */ 61#include <compat/linux/common/linux_msg.h> 62#include <compat/linux/common/linux_shm.h> 63#include <compat/linux/common/linux_sem.h> 64 65/* prototypes for sys_ipc stuff */ 66#include <compat/linux/common/linux_ipccall.h> 67 68/* Used on: arm, i386, m68k, mips, ppc, sparc, sparc64 */ 69/* Not used on: aarch64, alpha */ 70 71/* 72 * Stuff to deal with the SysV ipc/shm/semaphore interface in Linux. 73 * The main difference is, that Linux handles it all via one 74 * system call, which has the usual maximum amount of 5 arguments. 75 * This results in a kludge for calls that take 6 of them. 76 * 77 * The SYSV??? options have to be enabled to get the appropriate 78 * functions to work. 79 */ 80 81int 82linux_sys_ipc(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 83{ 84 /* { 85 syscallarg(int) what; 86 syscallarg(int) a1; 87 syscallarg(int) a2; 88 syscallarg(int) a3; 89 syscallarg(void *) ptr; 90 } */ 91 92 switch (SCARG(uap, what)) { 93#ifdef SYSVSEM 94 case LINUX_SYS_SEMOP: 95 return linux_semop(l, uap, retval); 96 case LINUX_SYS_SEMGET: 97 return linux_semget(l, uap, retval); 98 case LINUX_SYS_SEMCTL: { 99 struct linux_sys_semctl_args bsa; 100 union linux_semun arg; 101 int error; 102 103 SCARG(&bsa, semid) = SCARG(uap, a1); 104 SCARG(&bsa, semnum) = SCARG(uap, a2); 105 SCARG(&bsa, cmd) = SCARG(uap, a3); 106 /* Convert from (union linux_semun *) to (union linux_semun) */ 107 if ((error = copyin(SCARG(uap, ptr), &arg, sizeof arg))) 108 return error; 109 SCARG(&bsa, arg) = arg; 110 111 return linux_sys_semctl(l, &bsa, retval); 112 } 113#endif 114#ifdef SYSVMSG 115 case LINUX_SYS_MSGSND: 116 return linux_msgsnd(l, uap, retval); 117 case LINUX_SYS_MSGRCV: 118 return linux_msgrcv(l, uap, retval); 119 case LINUX_SYS_MSGGET: 120 return linux_msgget(l, uap, retval); 121 case LINUX_SYS_MSGCTL: { 122 struct linux_sys_msgctl_args bsa; 123 124 SCARG(&bsa, msqid) = SCARG(uap, a1); 125 SCARG(&bsa, cmd) = SCARG(uap, a2); 126 SCARG(&bsa, buf) = (struct linux_msqid_ds *)SCARG(uap, ptr); 127 128 return linux_sys_msgctl(l, &bsa, retval); 129 } 130#endif 131#ifdef SYSVSHM 132 case LINUX_SYS_SHMAT: { 133 struct linux_sys_shmat_args bsa; 134 135 SCARG(&bsa, shmid) = SCARG(uap, a1); 136 SCARG(&bsa, shmaddr) = (void *)SCARG(uap, ptr); 137 SCARG(&bsa, shmflg) = SCARG(uap, a2); 138 /* XXX passing pointer inside int here */ 139 SCARG(&bsa, raddr) = (u_long *)SCARG(uap, a3); 140 141 return linux_sys_shmat(l, &bsa, retval); 142 } 143 case LINUX_SYS_SHMDT: 144 return linux_shmdt(l, uap, retval); 145 case LINUX_SYS_SHMGET: 146 return linux_shmget(l, uap, retval); 147 case LINUX_SYS_SHMCTL: { 148 struct linux_sys_shmctl_args bsa; 149 150 SCARG(&bsa, shmid) = SCARG(uap, a1); 151 SCARG(&bsa, cmd) = SCARG(uap, a2); 152 SCARG(&bsa, buf) = (struct linux_shmid_ds *)SCARG(uap, ptr); 153 154 return linux_sys_shmctl(l, &bsa, retval); 155 } 156#endif 157 default: 158 return ENOSYS; 159 } 160} 161 162#ifdef SYSVSEM 163int 164linux_semop(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 165{ 166 /* { 167 syscallarg(int) what; 168 syscallarg(int) a1; 169 syscallarg(int) a2; 170 syscallarg(int) a3; 171 syscallarg(void *) ptr; 172 } */ 173 struct sys_semop_args bsa; 174 175 SCARG(&bsa, semid) = SCARG(uap, a1); 176 SCARG(&bsa, sops) = (struct sembuf *)SCARG(uap, ptr); 177 SCARG(&bsa, nsops) = SCARG(uap, a2); 178 179 return sys_semop(l, &bsa, retval); 180} 181 182int 183linux_semget(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 184{ 185 /* { 186 syscallarg(int) what; 187 syscallarg(int) a1; 188 syscallarg(int) a2; 189 syscallarg(int) a3; 190 syscallarg(void *) ptr; 191 } */ 192 struct sys_semget_args bsa; 193 194 SCARG(&bsa, key) = (key_t)SCARG(uap, a1); 195 SCARG(&bsa, nsems) = SCARG(uap, a2); 196 SCARG(&bsa, semflg) = SCARG(uap, a3); 197 198 return sys_semget(l, &bsa, retval); 199} 200 201#endif /* SYSVSEM */ 202 203#ifdef SYSVMSG 204 205int 206linux_msgsnd(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 207{ 208 struct sys_msgsnd_args bma; 209 210 SCARG(&bma, msqid) = SCARG(uap, a1); 211 SCARG(&bma, msgp) = SCARG(uap, ptr); 212 SCARG(&bma, msgsz) = SCARG(uap, a2); 213 SCARG(&bma, msgflg) = SCARG(uap, a3); 214 215 return sys_msgsnd(l, &bma, retval); 216} 217 218int 219linux_msgrcv(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 220{ 221 struct sys_msgrcv_args bma; 222 struct linux_msgrcv_msgarg kluge; 223 int error; 224 225 if ((error = copyin(SCARG(uap, ptr), &kluge, sizeof kluge))) 226 return error; 227 228 SCARG(&bma, msqid) = SCARG(uap, a1); 229 SCARG(&bma, msgp) = kluge.msg; 230 SCARG(&bma, msgsz) = SCARG(uap, a2); 231 SCARG(&bma, msgtyp) = kluge.type; 232 SCARG(&bma, msgflg) = SCARG(uap, a3); 233 234 return sys_msgrcv(l, &bma, retval); 235} 236 237int 238linux_msgget(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 239{ 240 struct sys_msgget_args bma; 241 242 SCARG(&bma, key) = (key_t)SCARG(uap, a1); 243 SCARG(&bma, msgflg) = SCARG(uap, a2); 244 245 return sys_msgget(l, &bma, retval); 246} 247 248#endif /* SYSVMSG */ 249 250#ifdef SYSVSHM 251/* 252 * shmdt(): this could have been mapped directly, if it wasn't for 253 * the extra indirection by the linux_ipc system call. 254 */ 255int 256linux_shmdt(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 257{ 258 struct sys_shmdt_args bsa; 259 260 SCARG(&bsa, shmaddr) = SCARG(uap, ptr); 261 262 return sys_shmdt(l, &bsa, retval); 263} 264 265/* 266 * Same story as shmdt. 267 */ 268int 269linux_shmget(struct lwp *l, const struct linux_sys_ipc_args *uap, register_t *retval) 270{ 271 struct linux_sys_shmget_args bsa; 272 273 SCARG(&bsa, key) = SCARG(uap, a1); 274 SCARG(&bsa, size) = SCARG(uap, a2); 275 SCARG(&bsa, shmflg) = SCARG(uap, a3); 276 277 return linux_sys_shmget(l, &bsa, retval); 278} 279 280#endif /* SYSVSHM */ 281