linux-kernel - [patch v4 20/27] signal: Add task argument to flush_sigqueue

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Message-ID: <20240927084818.130965127@linutronix.de>
Date: Fri, 27 Sep 2024 10:49:03 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>,
 John Stultz <jstultz@...gle.com>,
 Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...nel.org>,
 Stephen Boyd <sboyd@...nel.org>,
 Eric Biederman <ebiederm@...ssion.com>,
 Oleg Nesterov <oleg@...hat.com>
Subject: [patch v4 20/27] signal: Add task argument to flush_sigqueue_mask()

From: Thomas Gleixner <tglx@...utronix.de>

To prepare for handling posix timer signals on sigaction(SIG_IGN) properly,
add a task argument to flush_sigqueue_mask() and fixup all call sites.

This argument will be used in a later step to enqueue posix timers on an
ignored list, so their signal can be requeued when SIG_IGN is lifted later
on.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

---
 kernel/signal.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)
---
diff --git a/kernel/signal.c b/kernel/signal.c
index 48bceca90a91..93c2d681309c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -724,11 +724,10 @@ void signal_wake_up_state(struct task_struct *t, unsigned int state)
 
 /*
  * Remove signals in mask from the pending set and queue.
- * Returns 1 if any signals were found.
  *
  * All callers must be holding the siglock.
  */
-static void flush_sigqueue_mask(sigset_t *mask, struct sigpending *s)
+static void flush_sigqueue_mask(sigset_t *mask, struct sigpending *s, struct task_struct *ptmr_tsk)
 {
 	struct sigqueue *q, *n;
 	sigset_t m;
@@ -866,18 +865,18 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force)
 		 * This is a stop signal.  Remove SIGCONT from all queues.
 		 */
 		siginitset(&flush, sigmask(SIGCONT));
-		flush_sigqueue_mask(&flush, &signal->shared_pending);
+		flush_sigqueue_mask(&flush, &signal->shared_pending, NULL);
 		for_each_thread(p, t)
-			flush_sigqueue_mask(&flush, &t->pending);
+			flush_sigqueue_mask(&flush, &t->pending, NULL);
 	} else if (sig == SIGCONT) {
 		unsigned int why;
 		/*
 		 * Remove all stop signals from all queues, wake all threads.
 		 */
 		siginitset(&flush, SIG_KERNEL_STOP_MASK);
-		flush_sigqueue_mask(&flush, &signal->shared_pending);
+		flush_sigqueue_mask(&flush, &signal->shared_pending, NULL);
 		for_each_thread(p, t) {
-			flush_sigqueue_mask(&flush, &t->pending);
+			flush_sigqueue_mask(&flush, &t->pending, NULL);
 			task_clear_jobctl_pending(t, JOBCTL_STOP_PENDING);
 			if (likely(!(t->ptrace & PT_SEIZED))) {
 				t->jobctl &= ~JOBCTL_STOPPED;
@@ -4169,8 +4168,8 @@ void kernel_sigaction(int sig, __sighandler_t action)
 		sigemptyset(&mask);
 		sigaddset(&mask, sig);
 
-		flush_sigqueue_mask(&mask, &current->signal->shared_pending);
-		flush_sigqueue_mask(&mask, &current->pending);
+		flush_sigqueue_mask(&mask, &current->signal->shared_pending, NULL);
+		flush_sigqueue_mask(&mask, &current->pending, NULL);
 		recalc_sigpending();
 	}
 	spin_unlock_irq(&current->sighand->siglock);
@@ -4237,9 +4236,9 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
 		if (sig_handler_ignored(sig_handler(p, sig), sig)) {
 			sigemptyset(&mask);
 			sigaddset(&mask, sig);
-			flush_sigqueue_mask(&mask, &p->signal->shared_pending);
+			flush_sigqueue_mask(&mask, &p->signal->shared_pending, NULL);
 			for_each_thread(p, t)
-				flush_sigqueue_mask(&mask, &t->pending);
+				flush_sigqueue_mask(&mask, &t->pending, NULL);
 		}
 	}