ipc: fix sparc64 ipc() wrapper

Matt bisected a sparc64 specific issue with semctl, shmctl and msgctl
to a commit from my y2038 series in linux-5.1, as I missed the custom
sys_ipc() wrapper that sparc64 uses in place of the generic version that
I patched.

The problem is that the sys_{sem,shm,msg}ctl() functions in the kernel
now do not allow being called with the IPC_64 flag any more, resulting
in a -EINVAL error when they don't recognize the command.

Instead, the correct way to do this now is to call the internal
ksys_old_{sem,shm,msg}ctl() functions to select the API version.

As we generally move towards these functions anyway, change all of
sparc_ipc() to consistently use those in place of the sys_*() versions,
and move the required ksys_*() declarations into linux/syscalls.h

The IS_ENABLED(CONFIG_SYSVIPC) check is required to avoid link
errors when ipc is disabled.

Reported-by: Matt Turner <mattst88@gmail.com>
Fixes: 275f22148e87 ("ipc: rename old-style shmctl/semctl/msgctl syscalls")
Cc: stable@vger.kernel.org
Tested-by: Matt Turner <mattst88@gmail.com>
Tested-by: Anatoly Pugachev <matorola@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 39 insertions, 38 deletions

diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index ccc88926bc00..9f41a6f5a032 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/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;
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 88145da7d140..f7c561c4dcdd 100644
--- a/include/linux/syscalls.h
+++ b/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
diff --git a/ipc/util.h b/ipc/util.h
index 0fcf8e719b76..5766c61aed0e 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -276,29 +276,7 @@ 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,
@@ -306,6 +284,7 @@ long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
 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