From 6634ae1033ceaeca5877dd75723210f8c2648c17 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Fri, 8 Jul 2011 19:13:39 +0200 Subject: [PATCH] ptrace_init_task: initialize child->jobctl explicitly new_child->jobctl is not initialized during the fork, it is copied from parent->jobctl. Currently this is harmless, the forking task is running and copy_process() can't succeed if signal_pending() is true, so only JOBCTL_STOP_DEQUEUED can be copied. Still this is a bit fragile, it would be more clean to set ->jobctl = 0 explicitly. Also, check ->ptrace != 0 instead of PT_PTRACED, move the CONFIG_HAVE_HW_BREAKPOINT code up. Signed-off-by: Oleg Nesterov Acked-by: Tejun Heo --- include/linux/ptrace.h | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index eae381d584f9..fd8669fc339f 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -217,16 +217,17 @@ static inline void ptrace_init_task(struct task_struct *child, bool ptrace) { INIT_LIST_HEAD(&child->ptrace_entry); INIT_LIST_HEAD(&child->ptraced); - child->parent = child->real_parent; +#ifdef CONFIG_HAVE_HW_BREAKPOINT + atomic_set(&child->ptrace_bp_refcnt, 1); +#endif + child->jobctl = 0; child->ptrace = 0; - if (unlikely(ptrace) && (current->ptrace & PT_PTRACED)) { + child->parent = child->real_parent; + + if (unlikely(ptrace) && current->ptrace) { child->ptrace = current->ptrace; __ptrace_link(child, current->parent); } - -#ifdef CONFIG_HAVE_HW_BREAKPOINT - atomic_set(&child->ptrace_bp_refcnt, 1); -#endif } /** -- 2.20.1