commit 079b22dc9be985c591589fcb94769b8e13518aa0
author Eric W. Biederman <ebiederm@xmission.com> Mon Sep 03 10:32:52 2018 +0200
committer Eric W. Biederman <ebiederm@xmission.com> Tue Sep 11 21:19:35 2018 +0200
tree 13212013fd3981735b99e3da4f15e7d89cea283e
parent f149b31557446aff9ca96d4be7e39cc266f6e7cc

signal: Use SEND_SIG_PRIV not SEND_SIG_FORCED with SIGKILL and SIGSTOP

Now that siginfo is never allocated for SIGKILL and SIGSTOP there is
no difference between SEND_SIG_PRIV and SEND_SIG_FORCED for SIGKILL
and SIGSTOP.  This makes SEND_SIG_FORCED unnecessary and redundant in
the presence of SIGKILL and SIGSTOP.  Therefore change users of
SEND_SIG_FORCED that are sending SIGKILL or SIGSTOP to use
SEND_SIG_PRIV instead.

This removes the last users of SEND_SIG_FORCED.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

kernel/ptrace.c

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 21fec73..45f77a1 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -396,7 +396,7 @@ static int ptrace_attach(struct task_struct *task, long request,
 
 	/* SEIZE doesn't trap tracee on attach */
 	if (!seize)
-		send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
+		send_sig_info(SIGSTOP, SEND_SIG_PRIV, task);
 
 	spin_lock(&task->sighand->siglock);
 
@@ -563,7 +563,7 @@ void exit_ptrace(struct task_struct *tracer, struct list_head *dead)
 
 	list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
 		if (unlikely(p->ptrace & PT_EXITKILL))
-			send_sig_info(SIGKILL, SEND_SIG_FORCED, p);
+			send_sig_info(SIGKILL, SEND_SIG_PRIV, p);
 
 		if (__ptrace_detach(tracer, p))
 			list_add(&p->ptrace_entry, dead);