Merge branch 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux

Pull removal of in-kernel calls to syscalls from Dominik Brodowski:
 "System calls are interaction points between userspace and the kernel.
  Therefore, system call functions such as sys_xyzzy() or
  compat_sys_xyzzy() should only be called from userspace via the
  syscall table, but not from elsewhere in the kernel.

  At least on 64-bit x86, it will likely be a hard requirement from
  v4.17 onwards to not call system call functions in the kernel: It is
  better to use use a different calling convention for system calls
  there, where struct pt_regs is decoded on-the-fly in a syscall wrapper
  which then hands processing over to the actual syscall function. This
  means that only those parameters which are actually needed for a
  specific syscall are passed on during syscall entry, instead of
  filling in six CPU registers with random user space content all the
  time (which may cause serious trouble down the call chain). Those
  x86-specific patches will be pushed through the x86 tree in the near
  future.

  Moreover, rules on how data may be accessed may differ between kernel
  data and user data. This is another reason why calling sys_xyzzy() is
  generally a bad idea, and -- at most -- acceptable in arch-specific
  code.

  This patchset removes all in-kernel calls to syscall functions in the
  kernel with the exception of arch/. On top of this, it cleans up the
  three places where many syscalls are referenced or prototyped, namely
  kernel/sys_ni.c, include/linux/syscalls.h and include/linux/compat.h"

* 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux: (109 commits)
  bpf: whitelist all syscalls for error injection
  kernel/sys_ni: remove {sys_,sys_compat} from cond_syscall definitions
  kernel/sys_ni: sort cond_syscall() entries
  syscalls/x86: auto-create compat_sys_*() prototypes
  syscalls: sort syscall prototypes in include/linux/compat.h
  net: remove compat_sys_*() prototypes from net/compat.h
  syscalls: sort syscall prototypes in include/linux/syscalls.h
  kexec: move sys_kexec_load() prototype to syscalls.h
  x86/sigreturn: use SYSCALL_DEFINE0
  x86: fix sys_sigreturn() return type to be long, not unsigned long
  x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm()
  mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead()
  mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff()
  mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64()
  fs: add ksys_fallocate() wrapper; remove in-kernel calls to sys_fallocate()
  fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to syscalls
  fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate()
  fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscall
  kernel: add ksys_setsid() helper; remove in-kernel call to sys_setsid()
  kernel: add ksys_unshare() helper; remove in-kernel calls to sys_unshare()
  ...

15 files changed, 563 insertions, 340 deletions

diff --git a/kernel/compat.c b/kernel/compat.c
index 3f5fa8902e7d..6d21894806b4 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -488,61 +488,6 @@ get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
 }
 EXPORT_SYMBOL_GPL(get_compat_sigset);
 
-#ifdef CONFIG_NUMA
-COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
-                       compat_uptr_t __user *, pages32,
-                       const int __user *, nodes,
-                       int __user *, status,
-                       int, flags)
-{
-        const void __user * __user *pages;
-        int i;
-
-        pages = compat_alloc_user_space(nr_pages * sizeof(void *));
-        for (i = 0; i < nr_pages; i++) {
-                compat_uptr_t p;
-
-                if (get_user(p, pages32 + i) ||
-                        put_user(compat_ptr(p), pages + i))
-                        return -EFAULT;
-        }
-        return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
-}
-
-COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
-                       compat_ulong_t, maxnode,
-                       const compat_ulong_t __user *, old_nodes,
-                       const compat_ulong_t __user *, new_nodes)
-{
-        unsigned long __user *old = NULL;
-        unsigned long __user *new = NULL;
-        nodemask_t tmp_mask;
-        unsigned long nr_bits;
-        unsigned long size;
-
-        nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
-        size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
-        if (old_nodes) {
-                if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
-                        return -EFAULT;
-                old = compat_alloc_user_space(new_nodes ? size * 2 : size);
-                if (new_nodes)
-                        new = old + size / sizeof(unsigned long);
-                if (copy_to_user(old, nodes_addr(tmp_mask), size))
-                        return -EFAULT;
-        }
-        if (new_nodes) {
-                if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
-                        return -EFAULT;
-                if (new == NULL)
-                        new = compat_alloc_user_space(size);
-                if (copy_to_user(new, nodes_addr(tmp_mask), size))
-                        return -EFAULT;
-        }
-        return sys_migrate_pages(pid, nr_bits + 1, old, new);
-}
-#endif
-
 /*
  * Allocate user-space memory for the duration of a single system call,
  * in order to marshall parameters inside a compat thunk.
diff --git a/kernel/exit.c b/kernel/exit.c
index 995453d9fb55..c3c7ac560114 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1691,7 +1691,7 @@ SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
  */
 SYSCALL_DEFINE3(waitpid, pid_t, pid, int __user *, stat_addr, int, options)
 {
-        return sys_wait4(pid, stat_addr, options, NULL);
+        return kernel_wait4(pid, stat_addr, options, NULL);
 }
 
 #endif
diff --git a/kernel/fork.c b/kernel/fork.c
index e5d9d405ae4e..f71b67dc156d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1198,8 +1198,8 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
                          * not set up a proper pointer then tough luck.
                          */
                         put_user(0, tsk->clear_child_tid);
-                        sys_futex(tsk->clear_child_tid, FUTEX_WAKE,
-                                        1, NULL, NULL, 0);
+                        do_futex(tsk->clear_child_tid, FUTEX_WAKE,
+                                        1, NULL, NULL, 0, 0);
                 }
                 tsk->clear_child_tid = NULL;
         }
@@ -2354,7 +2354,7 @@ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp
  * constructed. Here we are modifying the current, active,
  * task_struct.
  */
-SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
+int ksys_unshare(unsigned long unshare_flags)
 {
         struct fs_struct *fs, *new_fs = NULL;
         struct files_struct *fd, *new_fd = NULL;
@@ -2470,6 +2470,11 @@ bad_unshare_out:
         return err;
 }
 
+SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
+{
+        return ksys_unshare(unshare_flags);
+}
+
 /*
  *      Helper to unshare the files of the current task.
  *      We don't want to expose copy_files internals to
diff --git a/kernel/kexec.c b/kernel/kexec.c
index e62ec4dc6620..aed8fb2564b3 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -192,11 +192,9 @@ out:
  * that to happen you need to do that yourself.
  */
 
-SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
-                struct kexec_segment __user *, segments, unsigned long, flags)
+static inline int kexec_load_check(unsigned long nr_segments,
+                                   unsigned long flags)
 {
-        int result;
-
         /* We only trust the superuser with rebooting the system. */
         if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
                 return -EPERM;
@@ -208,17 +206,29 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
         if ((flags & KEXEC_FLAGS) != (flags & ~KEXEC_ARCH_MASK))
                 return -EINVAL;
 
-        /* Verify we are on the appropriate architecture */
-        if (((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH) &&
-                ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
-                return -EINVAL;
-
         /* Put an artificial cap on the number
          * of segments passed to kexec_load.
          */
         if (nr_segments > KEXEC_SEGMENT_MAX)
                 return -EINVAL;
 
+        return 0;
+}
+
+SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
+                struct kexec_segment __user *, segments, unsigned long, flags)
+{
+        int result;
+
+        result = kexec_load_check(nr_segments, flags);
+        if (result)
+                return result;
+
+        /* Verify we are on the appropriate architecture */
+        if (((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH) &&
+                ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
+                return -EINVAL;
+
         /* Because we write directly to the reserved memory
          * region when loading crash kernels we need a mutex here to
          * prevent multiple crash  kernels from attempting to load
@@ -247,15 +257,16 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
         struct kexec_segment out, __user *ksegments;
         unsigned long i, result;
 
+        result = kexec_load_check(nr_segments, flags);
+        if (result)
+                return result;
+
         /* Don't allow clients that don't understand the native
          * architecture to do anything.
          */
         if ((flags & KEXEC_ARCH_MASK) == KEXEC_ARCH_DEFAULT)
                 return -EINVAL;
 
-        if (nr_segments > KEXEC_SEGMENT_MAX)
-                return -EINVAL;
-
         ksegments = compat_alloc_user_space(nr_segments * sizeof(out));
         for (i = 0; i < nr_segments; i++) {
                 result = copy_from_user(&in, &segments[i], sizeof(in));
@@ -272,6 +283,21 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
                         return -EFAULT;
         }
 
-        return sys_kexec_load(entry, nr_segments, ksegments, flags);
+        /* Because we write directly to the reserved memory
+         * region when loading crash kernels we need a mutex here to
+         * prevent multiple crash  kernels from attempting to load
+         * simultaneously, and to prevent a crash kernel from loading
+         * over the top of a in use crash kernel.
+         *
+         * KISS: always take the mutex.
+         */
+        if (!mutex_trylock(&kexec_mutex))
+                return -EBUSY;
+
+        result = do_kexec_load(entry, nr_segments, ksegments, flags);
+
+        mutex_unlock(&kexec_mutex);
+
+        return result;
 }
 #endif
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 0b53eef7d34b..93b57f026688 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -242,16 +242,16 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 
         /*
          * Reap the EXIT_ZOMBIE children we had before we ignored SIGCHLD.
-         * sys_wait4() will also block until our children traced from the
+         * kernel_wait4() will also block until our children traced from the
          * parent namespace are detached and become EXIT_DEAD.
          */
         do {
                 clear_thread_flag(TIF_SIGPENDING);
-                rc = sys_wait4(-1, NULL, __WALL, NULL);
+                rc = kernel_wait4(-1, NULL, __WALL, NULL);
         } while (rc != -ECHILD);
 
         /*
-         * sys_wait4() above can't reap the EXIT_DEAD children but we do not
+         * kernel_wait4() above can't reap the EXIT_DEAD children but we do not
          * really care, we could reparent them to the global init. We could
          * exit and reap ->child_reaper even if it is not the last thread in
          * this pid_ns, free_pid(pid_allocated == 0) calls proc_cleanup_work(),
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index a5c36e9c56a6..4710f1b142fc 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -701,7 +701,7 @@ int hibernate(void)
         }
 
         pr_info("Syncing filesystems ... \n");
-        sys_sync();
+        ksys_sync();
         pr_info("done.\n");
 
         error = freeze_processes();
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 0685c4499431..4c10be0f4843 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -560,7 +560,7 @@ static int enter_state(suspend_state_t state)
 #ifndef CONFIG_SUSPEND_SKIP_SYNC
         trace_suspend_resume(TPS("sync_filesystems"), 0, true);
         pr_info("Syncing filesystems ... ");
-        sys_sync();
+        ksys_sync();
         pr_cont("done.\n");
         trace_suspend_resume(TPS("sync_filesystems"), 0, false);
 #endif
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 22df9f7ff672..75c959de4b29 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -224,7 +224,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
                         break;
 
                 printk("Syncing filesystems ... ");
-                sys_sync();
+                ksys_sync();
                 printk("done.\n");
 
                 error = freeze_processes();
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index de440456f15c..28b68995a417 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4942,7 +4942,7 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
  *
  * Return: 0.
  */
-SYSCALL_DEFINE0(sched_yield)
+static void do_sched_yield(void)
 {
         struct rq_flags rf;
         struct rq *rq;
@@ -4963,7 +4963,11 @@ SYSCALL_DEFINE0(sched_yield)
         sched_preempt_enable_no_resched();
 
         schedule();
+}
 
+SYSCALL_DEFINE0(sched_yield)
+{
+        do_sched_yield();
         return 0;
 }
 
@@ -5047,7 +5051,7 @@ EXPORT_SYMBOL(__cond_resched_softirq);
 void __sched yield(void)
 {
         set_current_state(TASK_RUNNING);
-        sys_sched_yield();
+        do_sched_yield();
 }
 EXPORT_SYMBOL(yield);
 
diff --git a/kernel/signal.c b/kernel/signal.c
index c6e4c83dc090..f04466655238 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3573,9 +3573,8 @@ int __save_altstack(stack_t __user *uss, unsigned long sp)
 }
 
 #ifdef CONFIG_COMPAT
-COMPAT_SYSCALL_DEFINE2(sigaltstack,
-                        const compat_stack_t __user *, uss_ptr,
-                        compat_stack_t __user *, uoss_ptr)
+static int do_compat_sigaltstack(const compat_stack_t __user *uss_ptr,
+                                 compat_stack_t __user *uoss_ptr)
 {
         stack_t uss, uoss;
         int ret;
@@ -3602,9 +3601,16 @@ COMPAT_SYSCALL_DEFINE2(sigaltstack,
         return ret;
 }
 
+COMPAT_SYSCALL_DEFINE2(sigaltstack,
+                        const compat_stack_t __user *, uss_ptr,
+                        compat_stack_t __user *, uoss_ptr)
+{
+        return do_compat_sigaltstack(uss_ptr, uoss_ptr);
+}
+
 int compat_restore_altstack(const compat_stack_t __user *uss)
 {
-        int err = compat_sys_sigaltstack(uss, NULL);
+        int err = do_compat_sigaltstack(uss, NULL);
         /* squash all but -EFAULT for now */
         return err == -EFAULT ? err : 0;
 }
@@ -3629,11 +3635,20 @@ int __compat_save_altstack(compat_stack_t __user *uss, unsigned long sp)
 
 /**
  *  sys_sigpending - examine pending signals
- *  @set: where mask of pending signal is returned
+ *  @uset: where mask of pending signal is returned
  */
-SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, set)
+SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, uset)
 {
-        return sys_rt_sigpending((sigset_t __user *)set, sizeof(old_sigset_t)); 
+        sigset_t set;
+        int err;
+
+        if (sizeof(old_sigset_t) > sizeof(*uset))
+                return -EINVAL;
+
+        err = do_sigpending(&set);
+        if (!err && copy_to_user(uset, &set, sizeof(old_sigset_t)))
+                err = -EFAULT;
+        return err;
 }
 
 #ifdef CONFIG_COMPAT
diff --git a/kernel/sys.c b/kernel/sys.c
index f2289de20e19..ad692183dfe9 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -69,6 +69,8 @@
 #include <asm/io.h>
 #include <asm/unistd.h>
 
+#include "uid16.h"
+
 #ifndef SET_UNALIGN_CTL
 # define SET_UNALIGN_CTL(a, b)  (-EINVAL)
 #endif
@@ -340,7 +342,7 @@ out_unlock:
  *      operations (as far as semantic preservation is concerned).
  */
 #ifdef CONFIG_MULTIUSER
-SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
+long __sys_setregid(gid_t rgid, gid_t egid)
 {
         struct user_namespace *ns = current_user_ns();
         const struct cred *old;
@@ -392,12 +394,17 @@ error:
         return retval;
 }
 
+SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
+{
+        return __sys_setregid(rgid, egid);
+}
+
 /*
  * setgid() is implemented like SysV w/ SAVED_IDS
  *
  * SMP: Same implicit races as above.
  */
-SYSCALL_DEFINE1(setgid, gid_t, gid)
+long __sys_setgid(gid_t gid)
 {
         struct user_namespace *ns = current_user_ns();
         const struct cred *old;
@@ -429,6 +436,11 @@ error:
         return retval;
 }
 
+SYSCALL_DEFINE1(setgid, gid_t, gid)
+{
+        return __sys_setgid(gid);
+}
+
 /*
  * change the user struct in a credentials set to match the new UID
  */
@@ -473,7 +485,7 @@ static int set_user(struct cred *new)
  * 100% compatible with BSD.  A program which uses just setuid() will be
  * 100% compatible with POSIX with saved IDs.
  */
-SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
+long __sys_setreuid(uid_t ruid, uid_t euid)
 {
         struct user_namespace *ns = current_user_ns();
         const struct cred *old;
@@ -533,6 +545,11 @@ error:
         return retval;
 }
 
+SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
+{
+        return __sys_setreuid(ruid, euid);
+}
+
 /*
  * setuid() is implemented like SysV with SAVED_IDS
  *
@@ -544,7 +561,7 @@ error:
  * will allow a root program to temporarily drop privileges and be able to
  * regain them by swapping the real and effective uid.
  */
-SYSCALL_DEFINE1(setuid, uid_t, uid)
+long __sys_setuid(uid_t uid)
 {
         struct user_namespace *ns = current_user_ns();
         const struct cred *old;
@@ -586,12 +603,17 @@ error:
         return retval;
 }
 
+SYSCALL_DEFINE1(setuid, uid_t, uid)
+{
+        return __sys_setuid(uid);
+}
+
 
 /*
  * This function implements a generic ability to update ruid, euid,
  * and suid.  This allows you to implement the 4.4 compatible seteuid().
  */
-SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
+long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 {
         struct user_namespace *ns = current_user_ns();
         const struct cred *old;
@@ -656,6 +678,11 @@ error:
         return retval;
 }
 
+SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
+{
+        return __sys_setresuid(ruid, euid, suid);
+}
+
 SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp)
 {
         const struct cred *cred = current_cred();
@@ -678,7 +705,7 @@ SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t _
 /*
  * Same as above, but for rgid, egid, sgid.
  */
-SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
+long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 {
         struct user_namespace *ns = current_user_ns();
         const struct cred *old;
@@ -730,6 +757,11 @@ error:
         return retval;
 }
 
+SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
+{
+        return __sys_setresgid(rgid, egid, sgid);
+}
+
 SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp)
 {
         const struct cred *cred = current_cred();
@@ -757,7 +789,7 @@ SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t _
  * whatever uid it wants to). It normally shadows "euid", except when
  * explicitly set by setfsuid() or for access..
  */
-SYSCALL_DEFINE1(setfsuid, uid_t, uid)
+long __sys_setfsuid(uid_t uid)
 {
         const struct cred *old;
         struct cred *new;
@@ -793,10 +825,15 @@ change_okay:
         return old_fsuid;
 }
 
+SYSCALL_DEFINE1(setfsuid, uid_t, uid)
+{
+        return __sys_setfsuid(uid);
+}
+
 /*
  * Samma på svenska..
  */
-SYSCALL_DEFINE1(setfsgid, gid_t, gid)
+long __sys_setfsgid(gid_t gid)
 {
         const struct cred *old;
         struct cred *new;
@@ -830,6 +867,11 @@ change_okay:
         commit_creds(new);
         return old_fsgid;
 }
+
+SYSCALL_DEFINE1(setfsgid, gid_t, gid)
+{
+        return __sys_setfsgid(gid);
+}
 #endif /* CONFIG_MULTIUSER */
 
 /**
@@ -1027,7 +1069,7 @@ out:
         return err;
 }
 
-SYSCALL_DEFINE1(getpgid, pid_t, pid)
+static int do_getpgid(pid_t pid)
 {
         struct task_struct *p;
         struct pid *grp;
@@ -1055,11 +1097,16 @@ out:
         return retval;
 }
 
+SYSCALL_DEFINE1(getpgid, pid_t, pid)
+{
+        return do_getpgid(pid);
+}
+
 #ifdef __ARCH_WANT_SYS_GETPGRP
 
 SYSCALL_DEFINE0(getpgrp)
 {
-        return sys_getpgid(0);
+        return do_getpgid(0);
 }
 
 #endif
@@ -1103,7 +1150,7 @@ static void set_special_pids(struct pid *pid)
                 change_pid(curr, PIDTYPE_PGID, pid);
 }
 
-SYSCALL_DEFINE0(setsid)
+int ksys_setsid(void)
 {
         struct task_struct *group_leader = current->group_leader;
         struct pid *sid = task_pid(group_leader);
@@ -1136,6 +1183,11 @@ out:
         return err;
 }
 
+SYSCALL_DEFINE0(setsid)
+{
+        return ksys_setsid();
+}
+
 DECLARE_RWSEM(uts_sem);
 
 #ifdef COMPAT_UTS_MACHINE
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index b5189762d275..6cafc008f6db 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -17,245 +17,406 @@ asmlinkage long sys_ni_syscall(void)
         return -ENOSYS;
 }
 
-cond_syscall(sys_quotactl);
-cond_syscall(sys32_quotactl);
-cond_syscall(sys_acct);
-cond_syscall(sys_lookup_dcookie);
-cond_syscall(compat_sys_lookup_dcookie);
-cond_syscall(sys_swapon);
-cond_syscall(sys_swapoff);
-cond_syscall(sys_kexec_load);
-cond_syscall(compat_sys_kexec_load);
-cond_syscall(sys_kexec_file_load);
-cond_syscall(sys_init_module);
-cond_syscall(sys_finit_module);
-cond_syscall(sys_delete_module);
-cond_syscall(sys_socketpair);
-cond_syscall(sys_bind);
-cond_syscall(sys_listen);
-cond_syscall(sys_accept);
-cond_syscall(sys_accept4);
-cond_syscall(sys_connect);
-cond_syscall(sys_getsockname);
-cond_syscall(sys_getpeername);
-cond_syscall(sys_sendto);
-cond_syscall(sys_send);
-cond_syscall(sys_recvfrom);
-cond_syscall(sys_recv);
-cond_syscall(sys_socket);
-cond_syscall(sys_setsockopt);
-cond_syscall(compat_sys_setsockopt);
-cond_syscall(sys_getsockopt);
-cond_syscall(compat_sys_getsockopt);
-cond_syscall(sys_shutdown);
-cond_syscall(sys_sendmsg);
-cond_syscall(sys_sendmmsg);
-cond_syscall(compat_sys_sendmsg);
-cond_syscall(compat_sys_sendmmsg);
-cond_syscall(sys_recvmsg);
-cond_syscall(sys_recvmmsg);
-cond_syscall(compat_sys_recvmsg);
-cond_syscall(compat_sys_recv);
-cond_syscall(compat_sys_recvfrom);
-cond_syscall(compat_sys_recvmmsg);
-cond_syscall(sys_socketcall);
-cond_syscall(sys_futex);
-cond_syscall(compat_sys_futex);
-cond_syscall(sys_set_robust_list);
-cond_syscall(compat_sys_set_robust_list);
-cond_syscall(sys_get_robust_list);
-cond_syscall(compat_sys_get_robust_list);
-cond_syscall(sys_epoll_create);
-cond_syscall(sys_epoll_create1);
-cond_syscall(sys_epoll_ctl);
-cond_syscall(sys_epoll_wait);
-cond_syscall(sys_epoll_pwait);
-cond_syscall(compat_sys_epoll_pwait);
-cond_syscall(sys_semget);
-cond_syscall(sys_semop);
-cond_syscall(sys_semtimedop);
-cond_syscall(compat_sys_semtimedop);
-cond_syscall(sys_semctl);
-cond_syscall(compat_sys_semctl);
-cond_syscall(sys_msgget);
-cond_syscall(sys_msgsnd);
-cond_syscall(compat_sys_msgsnd);
-cond_syscall(sys_msgrcv);
-cond_syscall(compat_sys_msgrcv);
-cond_syscall(sys_msgctl);
-cond_syscall(compat_sys_msgctl);
-cond_syscall(sys_shmget);
-cond_syscall(sys_shmat);
-cond_syscall(compat_sys_shmat);
-cond_syscall(sys_shmdt);
-cond_syscall(sys_shmctl);
-cond_syscall(compat_sys_shmctl);
-cond_syscall(sys_mq_open);
-cond_syscall(sys_mq_unlink);
-cond_syscall(sys_mq_timedsend);
-cond_syscall(sys_mq_timedreceive);
-cond_syscall(sys_mq_notify);
-cond_syscall(sys_mq_getsetattr);
-cond_syscall(compat_sys_mq_open);
-cond_syscall(compat_sys_mq_timedsend);
-cond_syscall(compat_sys_mq_timedreceive);
-cond_syscall(compat_sys_mq_notify);
-cond_syscall(compat_sys_mq_getsetattr);
-cond_syscall(sys_mbind);
-cond_syscall(sys_get_mempolicy);
-cond_syscall(sys_set_mempolicy);
-cond_syscall(compat_sys_mbind);
-cond_syscall(compat_sys_get_mempolicy);
-cond_syscall(compat_sys_set_mempolicy);
-cond_syscall(sys_add_key);
-cond_syscall(sys_request_key);
-cond_syscall(sys_keyctl);
-cond_syscall(compat_sys_keyctl);
-cond_syscall(compat_sys_socketcall);
-cond_syscall(sys_inotify_init);
-cond_syscall(sys_inotify_init1);
-cond_syscall(sys_inotify_add_watch);
-cond_syscall(sys_inotify_rm_watch);
-cond_syscall(sys_migrate_pages);
-cond_syscall(sys_move_pages);
-cond_syscall(sys_chown16);
-cond_syscall(sys_fchown16);
-cond_syscall(sys_getegid16);
-cond_syscall(sys_geteuid16);
-cond_syscall(sys_getgid16);
-cond_syscall(sys_getgroups16);
-cond_syscall(sys_getresgid16);
-cond_syscall(sys_getresuid16);
-cond_syscall(sys_getuid16);
-cond_syscall(sys_lchown16);
-cond_syscall(sys_setfsgid16);
-cond_syscall(sys_setfsuid16);
-cond_syscall(sys_setgid16);
-cond_syscall(sys_setgroups16);
-cond_syscall(sys_setregid16);
-cond_syscall(sys_setresgid16);
-cond_syscall(sys_setresuid16);
-cond_syscall(sys_setreuid16);
-cond_syscall(sys_setuid16);
-cond_syscall(sys_sgetmask);
-cond_syscall(sys_ssetmask);
-cond_syscall(sys_vm86old);
-cond_syscall(sys_vm86);
-cond_syscall(sys_modify_ldt);
-cond_syscall(sys_ipc);
-cond_syscall(compat_sys_ipc);
-cond_syscall(compat_sys_sysctl);
-cond_syscall(sys_flock);
-cond_syscall(sys_io_setup);
-cond_syscall(sys_io_destroy);
-cond_syscall(sys_io_submit);
-cond_syscall(sys_io_cancel);
-cond_syscall(sys_io_getevents);
-cond_syscall(compat_sys_io_setup);
-cond_syscall(compat_sys_io_submit);
-cond_syscall(compat_sys_io_getevents);
-cond_syscall(sys_sysfs);
-cond_syscall(sys_syslog);
-cond_syscall(sys_process_vm_readv);
-cond_syscall(sys_process_vm_writev);
-cond_syscall(compat_sys_process_vm_readv);
-cond_syscall(compat_sys_process_vm_writev);
-cond_syscall(sys_uselib);
-cond_syscall(sys_fadvise64);
-cond_syscall(sys_fadvise64_64);
-cond_syscall(sys_madvise);
-cond_syscall(sys_setuid);
-cond_syscall(sys_setregid);
-cond_syscall(sys_setgid);
-cond_syscall(sys_setreuid);
-cond_syscall(sys_setresuid);
-cond_syscall(sys_getresuid);
-cond_syscall(sys_setresgid);
-cond_syscall(sys_getresgid);
-cond_syscall(sys_setgroups);
-cond_syscall(sys_getgroups);
-cond_syscall(sys_setfsuid);
-cond_syscall(sys_setfsgid);
-cond_syscall(sys_capget);
-cond_syscall(sys_capset);
-cond_syscall(sys_copy_file_range);
-
-/* arch-specific weak syscall entries */
-cond_syscall(sys_pciconfig_read);
-cond_syscall(sys_pciconfig_write);
-cond_syscall(sys_pciconfig_iobase);
-cond_syscall(compat_sys_s390_ipc);
-cond_syscall(ppc_rtas);
-cond_syscall(sys_spu_run);
-cond_syscall(sys_spu_create);
-cond_syscall(sys_subpage_prot);
-cond_syscall(sys_s390_pci_mmio_read);
-cond_syscall(sys_s390_pci_mmio_write);
-
-/* mmu depending weak syscall entries */
-cond_syscall(sys_mprotect);
-cond_syscall(sys_msync);
-cond_syscall(sys_mlock);
-cond_syscall(sys_munlock);
-cond_syscall(sys_mlockall);
-cond_syscall(sys_munlockall);
-cond_syscall(sys_mlock2);
-cond_syscall(sys_mincore);
-cond_syscall(sys_madvise);
-cond_syscall(sys_mremap);
-cond_syscall(sys_remap_file_pages);
-cond_syscall(compat_sys_move_pages);
-cond_syscall(compat_sys_migrate_pages);
-
-/* block-layer dependent */
-cond_syscall(sys_bdflush);
-cond_syscall(sys_ioprio_set);
-cond_syscall(sys_ioprio_get);
-
-/* New file descriptors */
-cond_syscall(sys_signalfd);
-cond_syscall(sys_signalfd4);
-cond_syscall(compat_sys_signalfd);
-cond_syscall(compat_sys_signalfd4);
-cond_syscall(sys_timerfd_create);
-cond_syscall(sys_timerfd_settime);
-cond_syscall(sys_timerfd_gettime);
-cond_syscall(compat_sys_timerfd_settime);
-cond_syscall(compat_sys_timerfd_gettime);
-cond_syscall(sys_eventfd);
-cond_syscall(sys_eventfd2);
-cond_syscall(sys_memfd_create);
-cond_syscall(sys_userfaultfd);
-
-/* performance counters: */
-cond_syscall(sys_perf_event_open);
-
-/* fanotify! */
-cond_syscall(sys_fanotify_init);
-cond_syscall(sys_fanotify_mark);
-cond_syscall(compat_sys_fanotify_mark);
+#define COND_SYSCALL(name) cond_syscall(sys_##name)
+#define COND_SYSCALL_COMPAT(name) cond_syscall(compat_sys_##name)
+
+/*
+ * This list is kept in the same order as include/uapi/asm-generic/unistd.h.
+ * Architecture specific entries go below, followed by deprecated or obsolete
+ * system calls.
+ */
+
+COND_SYSCALL(io_setup);
+COND_SYSCALL_COMPAT(io_setup);
+COND_SYSCALL(io_destroy);
+COND_SYSCALL(io_submit);
+COND_SYSCALL_COMPAT(io_submit);
+COND_SYSCALL(io_cancel);
+COND_SYSCALL(io_getevents);
+COND_SYSCALL_COMPAT(io_getevents);
+
+/* fs/xattr.c */
+
+/* fs/dcache.c */
+
+/* fs/cookies.c */
+COND_SYSCALL(lookup_dcookie);
+COND_SYSCALL_COMPAT(lookup_dcookie);
+
+/* fs/eventfd.c */
+COND_SYSCALL(eventfd2);
+
+/* fs/eventfd.c */
+COND_SYSCALL(epoll_create1);
+COND_SYSCALL(epoll_ctl);
+COND_SYSCALL(epoll_pwait);
+COND_SYSCALL_COMPAT(epoll_pwait);
+
+/* fs/fcntl.c */
+
+/* fs/inotify_user.c */
+COND_SYSCALL(inotify_init1);
+COND_SYSCALL(inotify_add_watch);
+COND_SYSCALL(inotify_rm_watch);
+
+/* fs/ioctl.c */
+
+/* fs/ioprio.c */
+COND_SYSCALL(ioprio_set);
+COND_SYSCALL(ioprio_get);
+
+/* fs/locks.c */
+COND_SYSCALL(flock);
+
+/* fs/namei.c */
+
+/* fs/namespace.c */
+
+/* fs/nfsctl.c */
+
+/* fs/open.c */
+
+/* fs/pipe.c */
+
+/* fs/quota.c */
+COND_SYSCALL(quotactl);
+
+/* fs/readdir.c */
+
+/* fs/read_write.c */
+
+/* fs/sendfile.c */
+
+/* fs/select.c */
+
+/* fs/signalfd.c */
+COND_SYSCALL(signalfd4);
+COND_SYSCALL_COMPAT(signalfd4);
+
+/* fs/splice.c */
+
+/* fs/stat.c */
+
+/* fs/sync.c */
+
+/* fs/timerfd.c */
+COND_SYSCALL(timerfd_create);
+COND_SYSCALL(timerfd_settime);
+COND_SYSCALL_COMPAT(timerfd_settime);
+COND_SYSCALL(timerfd_gettime);
+COND_SYSCALL_COMPAT(timerfd_gettime);
+
+/* fs/utimes.c */
+
+/* kernel/acct.c */
+COND_SYSCALL(acct);
+
+/* kernel/capability.c */
+COND_SYSCALL(capget);
+COND_SYSCALL(capset);
+
+/* kernel/exec_domain.c */
+
+/* kernel/exit.c */
+
+/* kernel/fork.c */
+
+/* kernel/futex.c */
+COND_SYSCALL(futex);
+COND_SYSCALL_COMPAT(futex);
+COND_SYSCALL(set_robust_list);
+COND_SYSCALL_COMPAT(set_robust_list);
+COND_SYSCALL(get_robust_list);
+COND_SYSCALL_COMPAT(get_robust_list);
+
+/* kernel/hrtimer.c */
+
+/* kernel/itimer.c */
+
+/* kernel/kexec.c */
+COND_SYSCALL(kexec_load);
+COND_SYSCALL_COMPAT(kexec_load);
+
+/* kernel/module.c */
+COND_SYSCALL(init_module);
+COND_SYSCALL(delete_module);
+
+/* kernel/posix-timers.c */
+
+/* kernel/printk.c */
+COND_SYSCALL(syslog);
+
+/* kernel/ptrace.c */
+
+/* kernel/sched/core.c */
+
+/* kernel/signal.c */
+
+/* kernel/sys.c */
+COND_SYSCALL(setregid);
+COND_SYSCALL(setgid);
+COND_SYSCALL(setreuid);
+COND_SYSCALL(setuid);
+COND_SYSCALL(setresuid);
+COND_SYSCALL(getresuid);
+COND_SYSCALL(setresgid);
+COND_SYSCALL(getresgid);
+COND_SYSCALL(setfsuid);
+COND_SYSCALL(setfsgid);
+COND_SYSCALL(setgroups);
+COND_SYSCALL(getgroups);
+
+/* kernel/time.c */
+
+/* kernel/timer.c */
+
+/* ipc/mqueue.c */
+COND_SYSCALL(mq_open);
+COND_SYSCALL_COMPAT(mq_open);
+COND_SYSCALL(mq_unlink);
+COND_SYSCALL(mq_timedsend);
+COND_SYSCALL_COMPAT(mq_timedsend);
+COND_SYSCALL(mq_timedreceive);
+COND_SYSCALL_COMPAT(mq_timedreceive);
+COND_SYSCALL(mq_notify);
+COND_SYSCALL_COMPAT(mq_notify);
+COND_SYSCALL(mq_getsetattr);
+COND_SYSCALL_COMPAT(mq_getsetattr);
+
+/* ipc/msg.c */
+COND_SYSCALL(msgget);
+COND_SYSCALL(msgctl);
+COND_SYSCALL_COMPAT(msgctl);
+COND_SYSCALL(msgrcv);
+COND_SYSCALL_COMPAT(msgrcv);
+COND_SYSCALL(msgsnd);
+COND_SYSCALL_COMPAT(msgsnd);
+
+/* ipc/sem.c */
+COND_SYSCALL(semget);
+COND_SYSCALL(semctl);
+COND_SYSCALL_COMPAT(semctl);
+COND_SYSCALL(semtimedop);
+COND_SYSCALL_COMPAT(semtimedop);
+COND_SYSCALL(semop);
+
+/* ipc/shm.c */
+COND_SYSCALL(shmget);
+COND_SYSCALL(shmctl);
+COND_SYSCALL_COMPAT(shmctl);
+COND_SYSCALL(shmat);
+COND_SYSCALL_COMPAT(shmat);
+COND_SYSCALL(shmdt);
+
+/* net/socket.c */
+COND_SYSCALL(socket);
+COND_SYSCALL(socketpair);
+COND_SYSCALL(bind);
+COND_SYSCALL(listen);
+COND_SYSCALL(accept);
+COND_SYSCALL(connect);
+COND_SYSCALL(getsockname);
+COND_SYSCALL(getpeername);
+COND_SYSCALL(setsockopt);
+COND_SYSCALL_COMPAT(setsockopt);
+COND_SYSCALL(getsockopt);
+COND_SYSCALL_COMPAT(getsockopt);
+COND_SYSCALL(sendto);
+COND_SYSCALL(shutdown);
+COND_SYSCALL(recvfrom);
+COND_SYSCALL_COMPAT(recvfrom);
+COND_SYSCALL(sendmsg);
+COND_SYSCALL_COMPAT(sendmsg);
+COND_SYSCALL(recvmsg);
+COND_SYSCALL_COMPAT(recvmsg);
+
+/* mm/filemap.c */
+
+/* mm/nommu.c, also with MMU */
+COND_SYSCALL(mremap);
+
+/* security/keys/keyctl.c */
+COND_SYSCALL(add_key);
+COND_SYSCALL(request_key);
+COND_SYSCALL(keyctl);
+COND_SYSCALL_COMPAT(keyctl);
+
+/* arch/example/kernel/sys_example.c */
+
+/* mm/fadvise.c */
+COND_SYSCALL(fadvise64_64);
+
+/* mm/, CONFIG_MMU only */
+COND_SYSCALL(swapon);
+COND_SYSCALL(swapoff);
+COND_SYSCALL(mprotect);
+COND_SYSCALL(msync);
+COND_SYSCALL(mlock);
+COND_SYSCALL(munlock);
+COND_SYSCALL(mlockall);
+COND_SYSCALL(munlockall);
+COND_SYSCALL(mincore);
+COND_SYSCALL(madvise);
+COND_SYSCALL(remap_file_pages);
+COND_SYSCALL(mbind);
+COND_SYSCALL_COMPAT(mbind);
+COND_SYSCALL(get_mempolicy);
+COND_SYSCALL_COMPAT(get_mempolicy);
+COND_SYSCALL(set_mempolicy);
+COND_SYSCALL_COMPAT(set_mempolicy);
+COND_SYSCALL(migrate_pages);
+COND_SYSCALL_COMPAT(migrate_pages);
+COND_SYSCALL(move_pages);
+COND_SYSCALL_COMPAT(move_pages);
+
+COND_SYSCALL(perf_event_open);
+COND_SYSCALL(accept4);
+COND_SYSCALL(recvmmsg);
+COND_SYSCALL_COMPAT(recvmmsg);
+
+/*
+ * Architecture specific syscalls: see further below
+ */
+
+/* fanotify */
+COND_SYSCALL(fanotify_init);
+COND_SYSCALL(fanotify_mark);
 
 /* open by handle */
-cond_syscall(sys_name_to_handle_at);
-cond_syscall(sys_open_by_handle_at);
-cond_syscall(compat_sys_open_by_handle_at);
+COND_SYSCALL(name_to_handle_at);
+COND_SYSCALL(open_by_handle_at);
+COND_SYSCALL_COMPAT(open_by_handle_at);
+
+COND_SYSCALL(sendmmsg);
+COND_SYSCALL_COMPAT(sendmmsg);
+COND_SYSCALL(process_vm_readv);
+COND_SYSCALL_COMPAT(process_vm_readv);
+COND_SYSCALL(process_vm_writev);
+COND_SYSCALL_COMPAT(process_vm_writev);
 
 /* compare kernel pointers */
-cond_syscall(sys_kcmp);
+COND_SYSCALL(kcmp);
+
+COND_SYSCALL(finit_module);
 
 /* operate on Secure Computing state */
-cond_syscall(sys_seccomp);
+COND_SYSCALL(seccomp);
+
+COND_SYSCALL(memfd_create);
 
 /* access BPF programs and maps */
-cond_syscall(sys_bpf);
+COND_SYSCALL(bpf);
 
 /* execveat */
-cond_syscall(sys_execveat);
+COND_SYSCALL(execveat);
+
+COND_SYSCALL(userfaultfd);
 
 /* membarrier */
-cond_syscall(sys_membarrier);
+COND_SYSCALL(membarrier);
+
+COND_SYSCALL(mlock2);
+
+COND_SYSCALL(copy_file_range);
 
 /* memory protection keys */
-cond_syscall(sys_pkey_mprotect);
-cond_syscall(sys_pkey_alloc);
-cond_syscall(sys_pkey_free);
+COND_SYSCALL(pkey_mprotect);
+COND_SYSCALL(pkey_alloc);
+COND_SYSCALL(pkey_free);
+
+
+/*
+ * Architecture specific weak syscall entries.
+ */
+
+/* pciconfig: alpha, arm, arm64, ia64, sparc */
+COND_SYSCALL(pciconfig_read);
+COND_SYSCALL(pciconfig_write);
+COND_SYSCALL(pciconfig_iobase);
+
+/* sys_socketcall: arm, mips, x86, ... */
+COND_SYSCALL(socketcall);
+COND_SYSCALL_COMPAT(socketcall);
+
+/* compat syscalls for arm64, x86, ... */
+COND_SYSCALL_COMPAT(sysctl);
+COND_SYSCALL_COMPAT(fanotify_mark);
+
+/* x86 */
+COND_SYSCALL(vm86old);
+COND_SYSCALL(modify_ldt);
+COND_SYSCALL_COMPAT(quotactl32);
+COND_SYSCALL(vm86);
+COND_SYSCALL(kexec_file_load);
+
+/* s390 */
+COND_SYSCALL(s390_pci_mmio_read);
+COND_SYSCALL(s390_pci_mmio_write);
+COND_SYSCALL_COMPAT(s390_ipc);
+
+/* powerpc */
+cond_syscall(ppc_rtas);
+COND_SYSCALL(spu_run);
+COND_SYSCALL(spu_create);
+COND_SYSCALL(subpage_prot);
+
+
+/*
+ * Deprecated system calls which are still defined in
+ * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
+ */
+
+/* __ARCH_WANT_SYSCALL_NO_FLAGS */
+COND_SYSCALL(epoll_create);
+COND_SYSCALL(inotify_init);
+COND_SYSCALL(eventfd);
+COND_SYSCALL(signalfd);
+COND_SYSCALL_COMPAT(signalfd);
+
+/* __ARCH_WANT_SYSCALL_OFF_T */
+COND_SYSCALL(fadvise64);
+
+/* __ARCH_WANT_SYSCALL_DEPRECATED */
+COND_SYSCALL(epoll_wait);
+COND_SYSCALL(recv);
+COND_SYSCALL_COMPAT(recv);
+COND_SYSCALL(send);
+COND_SYSCALL(bdflush);
+COND_SYSCALL(uselib);
+
+
+/*
+ * The syscalls below are not found in include/uapi/asm-generic/unistd.h
+ */
+
+/* obsolete: SGETMASK_SYSCALL */
+COND_SYSCALL(sgetmask);
+COND_SYSCALL(ssetmask);
+
+/* obsolete: SYSFS_SYSCALL */
+COND_SYSCALL(sysfs);
+
+/* obsolete: __ARCH_WANT_SYS_IPC */
+COND_SYSCALL(ipc);
+COND_SYSCALL_COMPAT(ipc);
+
+/* obsolete: UID16 */
+COND_SYSCALL(chown16);
+COND_SYSCALL(fchown16);
+COND_SYSCALL(getegid16);
+COND_SYSCALL(geteuid16);
+COND_SYSCALL(getgid16);
+COND_SYSCALL(getgroups16);
+COND_SYSCALL(getresgid16);
+COND_SYSCALL(getresuid16);
+COND_SYSCALL(getuid16);
+COND_SYSCALL(lchown16);
+COND_SYSCALL(setfsgid16);
+COND_SYSCALL(setfsuid16);
+COND_SYSCALL(setgid16);
+COND_SYSCALL(setgroups16);
+COND_SYSCALL(setregid16);
+COND_SYSCALL(setresgid16);
+COND_SYSCALL(setresuid16);
+COND_SYSCALL(setreuid16);
+COND_SYSCALL(setuid16);
diff --git a/kernel/uid16.c b/kernel/uid16.c
index ef1da2a5f9bd..af6925d8599b 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -18,44 +18,46 @@
 
 #include <linux/uaccess.h>
 
+#include "uid16.h"
+
 SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
 {
-        return sys_chown(filename, low2highuid(user), low2highgid(group));
+        return ksys_chown(filename, low2highuid(user), low2highgid(group));
 }
 
 SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
 {
-        return sys_lchown(filename, low2highuid(user), low2highgid(group));
+        return ksys_lchown(filename, low2highuid(user), low2highgid(group));
 }
 
 SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
 {
-        return sys_fchown(fd, low2highuid(user), low2highgid(group));
+        return ksys_fchown(fd, low2highuid(user), low2highgid(group));
 }
 
 SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
 {
-        return sys_setregid(low2highgid(rgid), low2highgid(egid));
+        return __sys_setregid(low2highgid(rgid), low2highgid(egid));
 }
 
 SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
 {
-        return sys_setgid(low2highgid(gid));
+        return __sys_setgid(low2highgid(gid));
 }
 
 SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
 {
-        return sys_setreuid(low2highuid(ruid), low2highuid(euid));
+        return __sys_setreuid(low2highuid(ruid), low2highuid(euid));
 }
 
 SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
 {
-        return sys_setuid(low2highuid(uid));
+        return __sys_setuid(low2highuid(uid));
 }
 
 SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
 {
-        return sys_setresuid(low2highuid(ruid), low2highuid(euid),
+        return __sys_setresuid(low2highuid(ruid), low2highuid(euid),
                                  low2highuid(suid));
 }
 
@@ -78,11 +80,10 @@ SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euid
 
 SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
 {
-        return sys_setresgid(low2highgid(rgid), low2highgid(egid),
+        return __sys_setresgid(low2highgid(rgid), low2highgid(egid),
                                  low2highgid(sgid));
 }
 
-
 SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
 {
         const struct cred *cred = current_cred();
@@ -102,12 +103,12 @@ SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egid
 
 SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
 {
-        return sys_setfsuid(low2highuid(uid));
+        return __sys_setfsuid(low2highuid(uid));
 }
 
 SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
 {
-        return sys_setfsgid(low2highgid(gid));
+        return __sys_setfsgid(low2highgid(gid));
 }
 
 static int groups16_to_user(old_gid_t __user *grouplist,
diff --git a/kernel/uid16.h b/kernel/uid16.h
new file mode 100644
index 000000000000..cdca040f7602
--- /dev/null
+++ b/kernel/uid16.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LINUX_UID16_H
+#define LINUX_UID16_H
+
+long __sys_setuid(uid_t uid);
+long __sys_setgid(gid_t gid);
+long __sys_setreuid(uid_t ruid, uid_t euid);
+long __sys_setregid(gid_t rgid, gid_t egid);
+long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid);
+long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid);
+long __sys_setfsuid(uid_t uid);
+long __sys_setfsgid(gid_t gid);
+
+#endif /* LINUX_UID16_H */
diff --git a/kernel/umh.c b/kernel/umh.c
index 18e5fa4b0e71..f76b3ff876cf 100644
--- a/kernel/umh.c
+++ b/kernel/umh.c
@@ -118,7 +118,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
 {
         pid_t pid;
 
-        /* If SIGCLD is ignored sys_wait4 won't populate the status. */
+        /* If SIGCLD is ignored kernel_wait4 won't populate the status. */
         kernel_sigaction(SIGCHLD, SIG_DFL);
         pid = kernel_thread(call_usermodehelper_exec_async, sub_info, SIGCHLD);
         if (pid < 0) {
@@ -135,7 +135,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
                  *
                  * Thus the __user pointer cast is valid here.
                  */
-                sys_wait4(pid, (int __user *)&ret, 0, NULL);
+                kernel_wait4(pid, (int __user *)&ret, 0, NULL);
 
                 /*
                  * If ret is 0, either call_usermodehelper_exec_async failed and