drm/nouveau: Implement mmap as GEM object function

[linux-2.6-microblaze.git] / kernel / ptrace.c

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 76f0945..2997ca6 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -170,6 +170,21 @@ void __ptrace_unlink(struct task_struct *child)
        spin_unlock(&child->sighand->siglock);
 }
 
+static bool looks_like_a_spurious_pid(struct task_struct *task)
+{
+       if (task->exit_code != ((PTRACE_EVENT_EXEC << 8) | SIGTRAP))
+               return false;
+
+       if (task_pid_vnr(task) == task->ptrace_message)
+               return false;
+       /*
+        * The tracee changed its pid but the PTRACE_EVENT_EXEC event
+        * was not wait()'ed, most probably debugger targets the old
+        * leader which was destroyed in de_thread().
+        */
+       return true;
+}
+
 /* Ensure that nothing can wake it up, even SIGKILL */
 static bool ptrace_freeze_traced(struct task_struct *task)
 {
@@ -180,7 +195,8 @@ static bool ptrace_freeze_traced(struct task_struct *task)
                return ret;
 
        spin_lock_irq(&task->sighand->siglock);
-       if (task_is_traced(task) && !__fatal_signal_pending(task)) {
+       if (task_is_traced(task) && !looks_like_a_spurious_pid(task) &&
+           !__fatal_signal_pending(task)) {
                task->state = __TASK_TRACED;
                ret = true;
        }