ptrace: cleanup ptrace_init_task()->ptrace_link() path

No functional changes.

ptrace_init_task() looks confusing, as if we always auto-attach when "bool
ptrace" argument is true, while in fact we attach only if current is
traced.

Make the code more explicit and kill now unused ptrace_link().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 8 deletions

diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 7456d7d87a19..1951805df63a 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -105,12 +105,7 @@ static inline int ptrace_reparented(struct task_struct *child)
 {
         return child->real_parent != child->parent;
 }
-static inline void ptrace_link(struct task_struct *child,
-                               struct task_struct *new_parent)
-{
-        if (unlikely(child->ptrace))
-                __ptrace_link(child, new_parent);
-}
+
 static inline void ptrace_unlink(struct task_struct *child)
 {
         if (unlikely(child->ptrace))
@@ -169,9 +164,9 @@ static inline void ptrace_init_task(struct task_struct *child, bool ptrace)
         INIT_LIST_HEAD(&child->ptraced);
         child->parent = child->real_parent;
         child->ptrace = 0;
-        if (unlikely(ptrace)) {
+        if (unlikely(ptrace) && (current->ptrace & PT_PTRACED)) {
                 child->ptrace = current->ptrace;
-                ptrace_link(child, current->parent);
+                __ptrace_link(child, current->parent);
         }
 }