Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-block.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index f1228d9f0b11747ca1b030cb831ecb0863e7af9c..53e780748fe3367973182edd594c3e27fc9108fd 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -726,7 +726,7 @@ void __put_task_struct(struct task_struct *tsk)
        WARN_ON(tsk == current);
 
        cgroup_free(tsk);
-       task_numa_free(tsk);
+       task_numa_free(tsk, true);
        security_task_free(tsk);
        exit_creds(tsk);
        delayacct_tsk_free(tsk);
@@ -768,6 +768,7 @@ static void set_max_threads(unsigned int max_threads_suggested)
 int arch_task_struct_size __read_mostly;
 #endif
 
+#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
 static void task_struct_whitelist(unsigned long *offset, unsigned long *size)
 {
        /* Fetch thread_struct whitelist for the architecture. */
@@ -782,6 +783,7 @@ static void task_struct_whitelist(unsigned long *offset, unsigned long *size)
        else
                *offset += offsetof(struct task_struct, thread);
 }
+#endif /* CONFIG_ARCH_TASK_STRUCT_ALLOCATOR */
 
 void __init fork_init(void)
 {
@@ -1662,6 +1664,14 @@ static inline void rcu_copy_process(struct task_struct *p)
 #endif /* #ifdef CONFIG_TASKS_RCU */
 }
 
+struct pid *pidfd_pid(const struct file *file)
+{
+       if (file->f_op == &pidfd_fops)
+               return file->private_data;
+
+       return ERR_PTR(-EBADF);
+}
+
 static int pidfd_release(struct inode *inode, struct file *file)
 {
        struct pid *pid = file->private_data;
@@ -2310,6 +2320,8 @@ struct mm_struct *copy_init_mm(void)
  *
  * It copies the process, and if successful kick-starts
  * it and waits for it to finish using the VM if required.
+ *
+ * args->exit_signal is expected to be checked for sanity by the caller.
  */
 long _do_fork(struct kernel_clone_args *args)
 {
@@ -2534,6 +2546,14 @@ noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs,
        if (copy_from_user(&args, uargs, size))
                return -EFAULT;
 
+       /*
+        * Verify that higher 32bits of exit_signal are unset and that
+        * it is a valid signal
+        */
+       if (unlikely((args.exit_signal & ~((u64)CSIGNAL)) ||
+                    !valid_signal(args.exit_signal)))
+               return -EINVAL;
+
        *kargs = (struct kernel_clone_args){
                .flags          = args.flags,
                .pidfd          = u64_to_user_ptr(args.pidfd),