^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This is really horribly ugly, and new architectures should just wire up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * the individual syscalls instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/ipc_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "util.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #ifdef __ARCH_WANT_SYS_IPC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/ipc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/shm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) int ksys_ipc(unsigned int call, int first, unsigned long second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) unsigned long third, void __user * ptr, long fifth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int version, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) version = call >> 16; /* hack for backward compatibility */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) call &= 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) switch (call) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) case SEMOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return ksys_semtimedop(first, (struct sembuf __user *)ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) second, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) case SEMTIMEDOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) if (IS_ENABLED(CONFIG_64BIT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return ksys_semtimedop(first, ptr, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) (const struct __kernel_timespec __user *)fifth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) else if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return compat_ksys_semtimedop(first, ptr, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) (const struct old_timespec32 __user *)fifth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) case SEMGET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return ksys_semget(first, second, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) case SEMCTL: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned long arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (!ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (get_user(arg, (unsigned long __user *) ptr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return ksys_old_semctl(first, second, third, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) case MSGSND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return ksys_msgsnd(first, (struct msgbuf __user *) ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) second, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) case MSGRCV:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) switch (version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) case 0: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct ipc_kludge tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (!ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (copy_from_user(&tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) (struct ipc_kludge __user *) ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) sizeof(tmp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return ksys_msgrcv(first, tmp.msgp, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) tmp.msgtyp, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return ksys_msgrcv(first,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) (struct msgbuf __user *) ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) second, fifth, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) case MSGGET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return ksys_msgget((key_t) first, second);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) case MSGCTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return ksys_old_msgctl(first, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) (struct msqid_ds __user *)ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) case SHMAT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) switch (version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) default: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned long raddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) ret = do_shmat(first, (char __user *)ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) second, &raddr, SHMLBA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return put_user(raddr, (unsigned long __user *) third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * This was the entry point for kernel-originating calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * from iBCS2 in 2.2 days.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) case SHMDT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return ksys_shmdt((char __user *)ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) case SHMGET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return ksys_shmget(first, second, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) case SHMCTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return ksys_old_shmctl(first, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) (struct shmid_ds __user *) ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned long, third, void __user *, ptr, long, fifth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return ksys_ipc(call, first, second, third, ptr, fifth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #ifndef COMPAT_SHMLBA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #define COMPAT_SHMLBA SHMLBA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct compat_ipc_kludge {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) compat_uptr_t msgp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) compat_long_t msgtyp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int compat_ksys_ipc(u32 call, int first, int second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) u32 third, compat_uptr_t ptr, u32 fifth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) int version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) u32 pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) version = call >> 16; /* hack for backward compatibility */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) call &= 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) switch (call) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) case SEMOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* struct sembuf is the same on 32 and 64bit :)) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) case SEMTIMEDOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) compat_ptr(fifth));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) case SEMGET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return ksys_semget(first, second, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) case SEMCTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return compat_ksys_old_semctl(first, second, third, pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) case MSGSND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return compat_ksys_msgsnd(first, ptr, second, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) case MSGRCV: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) void __user *uptr = compat_ptr(ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (first < 0 || second < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct compat_ipc_kludge ipck;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (!uptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (copy_from_user(&ipck, uptr, sizeof(ipck)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return compat_ksys_msgrcv(first, ipck.msgp, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ipck.msgtyp, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return compat_ksys_msgrcv(first, ptr, second, fifth, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) case MSGGET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return ksys_msgget(first, second);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) case MSGCTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return compat_ksys_old_msgctl(first, second, compat_ptr(ptr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) case SHMAT: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) unsigned long raddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (version == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) err = do_shmat(first, compat_ptr(ptr), second, &raddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) COMPAT_SHMLBA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) case SHMDT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return ksys_shmdt(compat_ptr(ptr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) case SHMGET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return ksys_shmget(first, (unsigned int)second, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) case SHMCTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return compat_ksys_old_shmctl(first, second, compat_ptr(ptr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) u32, third, compat_uptr_t, ptr, u32, fifth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return compat_ksys_ipc(call, first, second, third, ptr, fifth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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