From bb3696da89743d580f869142d0a6e6ba9b7fe89a Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Fri, 24 Jun 2011 17:34:23 +0200
Subject: [PATCH] ptrace: kill real_parent_is_ptracer() in in favor of
ptrace_reparented()
Kill real_parent_is_ptracer() and update the callers to use
ptrace_reparented(), after the previous patch they do the same.
Remove the unnecessary ->ptrace != 0 check in get_signal_to_deliver(),
if ptrace_reparented() == T then the task must be ptraced.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
---
kernel/signal.c | 20 ++++----------------
1 file changed, 4 insertions(+), 16 deletions(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index 4c4ad34caf77..0a1bf2c8bdcd 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1759,15 +1759,6 @@ static int sigkill_pending(struct task_struct *tsk)
sigismember(&tsk->signal->shared_pending.signal, SIGKILL);
}
-/*
- * Test whether the target task of the usual cldstop notification - the
- * real_parent of @child - is in the same group as the ptracer.
- */
-static bool real_parent_is_ptracer(struct task_struct *child)
-{
- return same_thread_group(child->parent, child->real_parent);
-}
-
/*
* This must be called with current->sighand->siglock held.
*
@@ -1848,7 +1839,7 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
* separately unless they're gonna be duplicates.
*/
do_notify_parent_cldstop(current, true, why);
- if (gstop_done && !real_parent_is_ptracer(current))
+ if (gstop_done && ptrace_reparented(current))
do_notify_parent_cldstop(current, false, why);
/*
@@ -2154,7 +2145,6 @@ relock:
* the CLD_ si_code into SIGNAL_CLD_MASK bits.
*/
if (unlikely(signal->flags & SIGNAL_CLD_MASK)) {
- struct task_struct *leader;
int why;
if (signal->flags & SIGNAL_CLD_CONTINUED)
@@ -2175,13 +2165,11 @@ relock:
* a duplicate.
*/
read_lock(&tasklist_lock);
-
do_notify_parent_cldstop(current, false, why);
- leader = current->group_leader;
- if (leader->ptrace && !real_parent_is_ptracer(leader))
- do_notify_parent_cldstop(leader, true, why);
-
+ if (ptrace_reparented(current->group_leader))
+ do_notify_parent_cldstop(current->group_leader,
+ true, why);
read_unlock(&tasklist_lock);
goto relock;
--
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