linux-kernel - [PATCH 09/10] signal: Use SEND_SIG_PRIV not SEND_SIG

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Date:   Mon,  3 Sep 2018 22:44:29 +0200
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-api@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 09/10] 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.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 kernel/pid_namespace.c | 2 +-
 kernel/ptrace.c        | 4 ++--
 mm/oom_kill.c          | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 2a2ac53d8b8b..c8d53397bbdd 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -216,7 +216,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 	idr_for_each_entry_continue(&pid_ns->idr, pid, nr) {
 		task = pid_task(pid, PIDTYPE_PID);
 		if (task && !__fatal_signal_pending(task))
-			send_sig_info(SIGKILL, SEND_SIG_FORCED, task);
+			send_sig_info(SIGKILL, SEND_SIG_PRIV, task);
 	}
 	read_unlock(&tasklist_lock);
 	rcu_read_unlock();
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 21fec73d45d4..45f77a1b9c97 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);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index b5b25e4dcbbb..3bcfeaaeed87 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -858,7 +858,7 @@ static void __oom_kill_process(struct task_struct *victim)
 	 * in order to prevent the OOM victim from depleting the memory
 	 * reserves from the user space under its control.
 	 */
-	do_send_sig_info(SIGKILL, SEND_SIG_FORCED, victim, PIDTYPE_TGID);
+	do_send_sig_info(SIGKILL, SEND_SIG_PRIV, victim, PIDTYPE_TGID);
 	mark_oom_victim(victim);
 	pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n",
 		task_pid_nr(victim), victim->comm, K(victim->mm->total_vm),
@@ -896,7 +896,7 @@ static void __oom_kill_process(struct task_struct *victim)
 		 */
 		if (unlikely(p->flags & PF_KTHREAD))
 			continue;
-		do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, PIDTYPE_TGID);
+		do_send_sig_info(SIGKILL, SEND_SIG_PRIV, p, PIDTYPE_TGID);
 	}
 	rcu_read_unlock();
 
-- 
2.17.1