Merge tag 'ipc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pull ipc regression fixes from Arnd Bergmann:
 "Fix ipc regressions from y2038 patches

  These are two regression fixes for bugs that got introduced during the
  system call rework that went into linux-5.1 but only bisected and
  fixed now:

   - One patch affects semtimedop() on many of the less common 32-bit
     architectures, this just needs a single-line bugfix.

   - The other affects only sparc64 and has a slightly more invasive
     workaround to apply the same change to sparc64 that was done to the
     generic code used everywhere else"

* tag 'ipc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  ipc: fix sparc64 ipc() wrapper
  ipc: fix semtimedop for generic 32-bit architectures

Author: torvalds

arch/sparc/kernel/sys_sparc_64.c

@@ -336,25 +336,28 @@ SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second
 {
 	long err;
 
+	if (!IS_ENABLED(CONFIG_SYSVIPC))
+		return -ENOSYS;
+
 	/* No need for backward compatibility. We can start fresh... */
 	if (call <= SEMTIMEDOP) {
 		switch (call) {
 		case SEMOP:
-			err = sys_semtimedop(first, ptr,
-					     (unsigned int)second, NULL);
+			err = ksys_semtimedop(first, ptr,
+					      (unsigned int)second, NULL);
 			goto out;
 		case SEMTIMEDOP:
-			err = sys_semtimedop(first, ptr, (unsigned int)second,
+			err = ksys_semtimedop(first, ptr, (unsigned int)second,
 				(const struct __kernel_timespec __user *)
-					     (unsigned long) fifth);
+					      (unsigned long) fifth);
 			goto out;
 		case SEMGET:
-			err = sys_semget(first, (int)second, (int)third);
+			err = ksys_semget(first, (int)second, (int)third);
 			goto out;
 		case SEMCTL: {
-			err = sys_semctl(first, second,
-					 (int)third | IPC_64,
-					 (unsigned long) ptr);
+			err = ksys_old_semctl(first, second,
+					      (int)third | IPC_64,
+					      (unsigned long) ptr);
 			goto out;
 		}
 		default:
@@ -365,18 +368,18 @@ SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second
 	if (call <= MSGCTL) {
 		switch (call) {
 		case MSGSND:
-			err = sys_msgsnd(first, ptr, (size_t)second,
+			err = ksys_msgsnd(first, ptr, (size_t)second,
 					 (int)third);
 			goto out;
 		case MSGRCV:
-			err = sys_msgrcv(first, ptr, (size_t)second, fifth,
+			err = ksys_msgrcv(first, ptr, (size_t)second, fifth,
 					 (int)third);
 			goto out;
 		case MSGGET:
-			err = sys_msgget((key_t)first, (int)second);
+			err = ksys_msgget((key_t)first, (int)second);
 			goto out;
 		case MSGCTL:
-			err = sys_msgctl(first, (int)second | IPC_64, ptr);
+			err = ksys_old_msgctl(first, (int)second | IPC_64, ptr);
 			goto out;
 		default:
 			err = -ENOSYS;
@@ -396,13 +399,13 @@ SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second
 			goto out;
 		}
 		case SHMDT:
-			err = sys_shmdt(ptr);
+			err = ksys_shmdt(ptr);
 			goto out;
 		case SHMGET:
-			err = sys_shmget(first, (size_t)second, (int)third);
+			err = ksys_shmget(first, (size_t)second, (int)third);
 			goto out;
 		case SHMCTL:
-			err = sys_shmctl(first, (int)second | IPC_64, ptr);
+			err = ksys_old_shmctl(first, (int)second | IPC_64, ptr);
 			goto out;
 		default:
 			err = -ENOSYS;

include/linux/syscalls.h

@@ -1402,4 +1402,23 @@ static inline unsigned int ksys_personality(unsigned int personality)
 	return old;
 }
 
+/* for __ARCH_WANT_SYS_IPC */
+long ksys_semtimedop(int semid, struct sembuf __user *tsops,
+		     unsigned int nsops,
+		     const struct __kernel_timespec __user *timeout);
+long ksys_semget(key_t key, int nsems, int semflg);
+long ksys_old_semctl(int semid, int semnum, int cmd, unsigned long arg);
+long ksys_msgget(key_t key, int msgflg);
+long ksys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
+long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz,
+		 long msgtyp, int msgflg);
+long ksys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz,
+		 int msgflg);
+long ksys_shmget(key_t key, size_t size, int shmflg);
+long ksys_shmdt(char __user *shmaddr);
+long ksys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
+long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems,
+			    unsigned int nsops,
+			    const struct old_timespec32 __user *timeout);
+
 #endif

include/uapi/asm-generic/unistd.h

@@ -569,7 +569,7 @@ __SYSCALL(__NR_semget, sys_semget)
 __SC_COMP(__NR_semctl, sys_semctl, compat_sys_semctl)
 #if defined(__ARCH_WANT_TIME32_SYSCALLS) || __BITS_PER_LONG != 32
 #define __NR_semtimedop 192
-__SC_COMP(__NR_semtimedop, sys_semtimedop, sys_semtimedop_time32)
+__SC_3264(__NR_semtimedop, sys_semtimedop_time32, sys_semtimedop)
 #endif
 #define __NR_semop 193
 __SYSCALL(__NR_semop, sys_semop)

ipc/util.h

@@ -276,36 +276,15 @@ static inline int compat_ipc_parse_version(int *cmd)
 	*cmd &= ~IPC_64;
 	return version;
 }
-#endif
 
-/* for __ARCH_WANT_SYS_IPC */
-long ksys_semtimedop(int semid, struct sembuf __user *tsops,
-		     unsigned int nsops,
-		     const struct __kernel_timespec __user *timeout);
-long ksys_semget(key_t key, int nsems, int semflg);
-long ksys_old_semctl(int semid, int semnum, int cmd, unsigned long arg);
-long ksys_msgget(key_t key, int msgflg);
-long ksys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
-long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz,
-		 long msgtyp, int msgflg);
-long ksys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz,
-		 int msgflg);
-long ksys_shmget(key_t key, size_t size, int shmflg);
-long ksys_shmdt(char __user *shmaddr);
-long ksys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
-
-/* for CONFIG_ARCH_WANT_OLD_COMPAT_IPC */
-long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems,
-			    unsigned int nsops,
-			    const struct old_timespec32 __user *timeout);
-#ifdef CONFIG_COMPAT
 long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg);
 long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr);
 long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
 			compat_long_t msgtyp, int msgflg);
 long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
 		       compat_ssize_t msgsz, int msgflg);
 long compat_ksys_old_shmctl(int shmid, int cmd, void __user *uptr);
-#endif /* CONFIG_COMPAT */
+
+#endif
 
 #endif