linux-kernel - [tip: timers/core] signal: Provide ignored_posix

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <173094309361.32228.16885228457351234466.tip-bot2@tip-bot2>
Date: Thu, 07 Nov 2024 01:31:33 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: timers/core] signal: Provide ignored_posix_timers list

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     69f032c92cf883ea74a4b69ba3d91317aa6f174e
Gitweb:        https://git.kernel.org/tip/69f032c92cf883ea74a4b69ba3d91317aa6f174e
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Tue, 05 Nov 2024 09:14:49 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 07 Nov 2024 02:14:45 +01:00

signal: Provide ignored_posix_timers list

To prepare for handling posix timer signals on sigaction(SIG_IGN) properly,
add a list to task::signal.

This list will be used to queue posix timers so their signal can be
requeued when SIG_IGN is lifted later.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/all/20241105064213.920101900@linutronix.de


---
 include/linux/sched/signal.h | 1 +
 init/init_task.c             | 5 +++--
 kernel/fork.c                | 1 +
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index 02972fd..d5d03d9 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -138,6 +138,7 @@ struct signal_struct {
 	/* POSIX.1b Interval Timers */
 	unsigned int		next_posix_timer_id;
 	struct hlist_head	posix_timers;
+	struct hlist_head	ignored_posix_timers;
 
 	/* ITIMER_REAL timer for the process */
 	struct hrtimer real_timer;
diff --git a/init/init_task.c b/init/init_task.c
index 136a823..e557f62 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -30,8 +30,9 @@ static struct signal_struct init_signals = {
 	.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
 	.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
 #ifdef CONFIG_POSIX_TIMERS
-	.posix_timers	= HLIST_HEAD_INIT,
-	.cputimer	= {
+	.posix_timers		= HLIST_HEAD_INIT,
+	.ignored_posix_timers	= HLIST_HEAD_INIT,
+	.cputimer		= {
 		.cputime_atomic	= INIT_CPUTIME_ATOMIC,
 	},
 #endif
diff --git a/kernel/fork.c b/kernel/fork.c
index 60c0b48..c2bd836 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1864,6 +1864,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 
 #ifdef CONFIG_POSIX_TIMERS
 	INIT_HLIST_HEAD(&sig->posix_timers);
+	INIT_HLIST_HEAD(&sig->ignored_posix_timers);
 	hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	sig->real_timer.function = it_real_fn;
 #endif