1 files changed, 11 insertions, 4 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index b373322ca497..c21bae8c93b9 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -181,6 +181,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
         /* One for us, one for whoever does the "release_task()" (usually parent) */
         atomic_set(&tsk->usage,2);
         atomic_set(&tsk->fs_excl, 0);
+        tsk->btrace_seq = 0;
         return tsk;
 }
 
@@ -607,12 +608,12 @@ static struct files_struct *alloc_files(void)
         atomic_set(&newf->count, 1);
 
         spin_lock_init(&newf->file_lock);
+        newf->next_fd = 0;
         fdt = &newf->fdtab;
-        fdt->next_fd = 0;
         fdt->max_fds = NR_OPEN_DEFAULT;
-        fdt->max_fdset = __FD_SETSIZE;
-        fdt->close_on_exec = &newf->close_on_exec_init;
-        fdt->open_fds = &newf->open_fds_init;
+        fdt->max_fdset = EMBEDDED_FD_SET_SIZE;
+        fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
+        fdt->open_fds = (fd_set *)&newf->open_fds_init;
         fdt->fd = &newf->fd_array[0];
         INIT_RCU_HEAD(&fdt->rcu);
         fdt->free_files = NULL;
@@ -1534,6 +1535,12 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
 
         check_unshare_flags(&unshare_flags);
 
+        /* Return -EINVAL for all unsupported flags */
+        err = -EINVAL;
+        if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
+                                CLONE_VM|CLONE_FILES|CLONE_SYSVSEM))
+                goto bad_unshare_out;
+
         if ((err = unshare_thread(unshare_flags)))
                 goto bad_unshare_out;
         if ((err = unshare_fs(unshare_flags, &new_fs)))