// SPDX-License-Identifier: GPL-2.0 /* * sys_ipc() is the old de-multiplexer for the SysV IPC calls. * * This is really horribly ugly, and new architectures should just wire up * the individual syscalls instead. */ #include <linux/unistd.h> #include <linux/syscalls.h> #include <linux/security.h> #include <linux/ipc_namespace.h> #include "util.h" #ifdef __ARCH_WANT_SYS_IPC #include <linux/errno.h> #include <linux/ipc.h> #include <linux/shm.h> #include <linux/uaccess.h> SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second, unsigned long, third, void __user *, ptr, long, fifth) { int version, ret; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: return ksys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME)) return ksys_semtimedop(first, ptr, second, (const struct __kernel_timespec __user *)fifth); else if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)) return compat_ksys_semtimedop(first, ptr, second, (const struct old_timespec32 __user *)fifth); else return -ENOSYS; case SEMGET: return ksys_semget(first, second, third); case SEMCTL: { unsigned long arg; if (!ptr) return -EINVAL; if (get_user(arg, (unsigned long __user *) ptr)) return -EFAULT; return ksys_semctl(first, second, third, arg); } case MSGSND: return ksys_msgsnd(first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL; if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof(tmp))) return -EFAULT; return ksys_msgrcv(first, tmp.msgp, second, tmp.msgtyp, third); } default: return ksys_msgrcv(first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return ksys_msgget((key_t) first, second); case MSGCTL: return ksys_msgctl(first, second, (struct msqid_ds __user *)ptr); case SHMAT: switch (version) { default: { unsigned long raddr; ret = do_shmat(first, (char __user *)ptr, second, &raddr, SHMLBA); if (ret) return ret; return put_user(raddr, (unsigned long __user *) third); } case 1: /* * This was the entry point for kernel-originating calls * from iBCS2 in 2.2 days. */ return -EINVAL; } case SHMDT: return ksys_shmdt((char __user *)ptr); case SHMGET: return ksys_shmget(first, second, third); case SHMCTL: return ksys_shmctl(first, second, (struct shmid_ds __user *) ptr); default: return -ENOSYS; } } #endif #ifdef CONFIG_COMPAT #include <linux/compat.h> #ifndef COMPAT_SHMLBA #define COMPAT_SHMLBA SHMLBA #endif struct compat_ipc_kludge { compat_uptr_t msgp; compat_long_t msgtyp; }; #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, u32, third, compat_uptr_t, ptr, u32, fifth) { int version; u32 pad; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: /* struct sembuf is the same on 32 and 64bit :)) */ return ksys_semtimedop(first, compat_ptr(ptr), second, NULL); case SEMTIMEDOP: if (!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)) return -ENOSYS; return compat_ksys_semtimedop(first, compat_ptr(ptr), second, compat_ptr(fifth)); case SEMGET: return ksys_semget(first, second, third); case SEMCTL: if (!ptr) return -EINVAL; if (get_user(pad, (u32 __user *) compat_ptr(ptr))) return -EFAULT; return compat_ksys_semctl(first, second, third, pad); case MSGSND: return compat_ksys_msgsnd(first, ptr, second, third); case MSGRCV: { void __user *uptr = compat_ptr(ptr); if (first < 0 || second < 0) return -EINVAL; if (!version) { struct compat_ipc_kludge ipck; if (!uptr) return -EINVAL; if (copy_from_user(&ipck, uptr, sizeof(ipck))) return -EFAULT; return compat_ksys_msgrcv(first, ipck.msgp, second, ipck.msgtyp, third); } return compat_ksys_msgrcv(first, ptr, second, fifth, third); } case MSGGET: return ksys_msgget(first, second); case MSGCTL: return compat_ksys_msgctl(first, second, compat_ptr(ptr)); case SHMAT: { int err; unsigned long raddr; if (version == 1) return -EINVAL; err = do_shmat(first, compat_ptr(ptr), second, &raddr, COMPAT_SHMLBA); if (err < 0) return err; return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third)); } case SHMDT: return ksys_shmdt(compat_ptr(ptr)); case SHMGET: return ksys_shmget(first, (unsigned int)second, third); case SHMCTL: return compat_ksys_shmctl(first, second, compat_ptr(ptr)); } return -ENOSYS; } #endif #endif