3 files changed, 50 insertions, 13 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 3451577261..d2fa57d480 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -180,6 +180,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
         atomic_set(&tsk->usage,2);
         atomic_set(&tsk->fs_excl, 0);
         tsk->btrace_seq = 0;
+        tsk->splice_pipe = NULL;
         return tsk;
 }
 
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1156eb0977..1fbf466a29 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -585,6 +585,9 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
         int i;
 
         rp->kp.pre_handler = pre_handler_kretprobe;
+        rp->kp.post_handler = NULL;
+        rp->kp.fault_handler = NULL;
+        rp->kp.break_handler = NULL;
 
         /* Pre-allocate memory for max kretprobe instances */
         if (rp->maxactive <= 0) {
diff --git a/kernel/uid16.c b/kernel/uid16.c
index aa25605027..187e2a4238 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -20,43 +20,67 @@
 
 asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group)
 {
-        return sys_chown(filename, low2highuid(user), low2highgid(group));
+        long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group)
 {
-        return sys_lchown(filename, low2highuid(user), low2highgid(group));
+        long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
 {
-        return sys_fchown(fd, low2highuid(user), low2highgid(group));
+        long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
 {
-        return sys_setregid(low2highgid(rgid), low2highgid(egid));
+        long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_setgid16(old_gid_t gid)
 {
-        return sys_setgid(low2highgid(gid));
+        long ret = sys_setgid(low2highgid(gid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
 {
-        return sys_setreuid(low2highuid(ruid), low2highuid(euid));
+        long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_setuid16(old_uid_t uid)
 {
-        return sys_setuid(low2highuid(uid));
+        long ret = sys_setuid(low2highuid(uid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
 {
-        return sys_setresuid(low2highuid(ruid), low2highuid(euid),
-                low2highuid(suid));
+        long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
+                                 low2highuid(suid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
@@ -72,8 +96,11 @@ asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid,
 
 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
 {
-        return sys_setresgid(low2highgid(rgid), low2highgid(egid),
-                low2highgid(sgid));
+        long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
+                                 low2highgid(sgid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
@@ -89,12 +116,18 @@ asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid,
 
 asmlinkage long sys_setfsuid16(old_uid_t uid)
 {
-        return sys_setfsuid(low2highuid(uid));
+        long ret = sys_setfsuid(low2highuid(uid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 asmlinkage long sys_setfsgid16(old_gid_t gid)
 {
-        return sys_setfsgid(low2highgid(gid));
+        long ret = sys_setfsgid(low2highgid(gid));
+        /* avoid REGPARM breakage on x86: */
+        prevent_tail_call(ret);
+        return ret;
 }
 
 static int groups16_to_user(old_gid_t __user *grouplist,