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signal: Provide ignored_posix_timers list

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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@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20241105064213.920101900@linutronix.de
This commit is contained in:
Thomas Gleixner 2024-11-05 09:14:49 +01:00
parent 647da5f709
commit 69f032c92c
3 changed files with 5 additions and 2 deletions
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1
include/linux/sched/signal.h
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@ -138,6 +138,7 @@ struct signal_struct {
/* POSIX.1b Interval Timers */ /* POSIX.1b Interval Timers */
unsigned int next_posix_timer_id; unsigned int next_posix_timer_id;
struct hlist_head posix_timers; struct hlist_head posix_timers;
struct hlist_head ignored_posix_timers;
/* ITIMER_REAL timer for the process */ /* ITIMER_REAL timer for the process */
struct hrtimer real_timer; struct hrtimer real_timer;

5
init/init_task.c
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@ -30,8 +30,9 @@ static struct signal_struct init_signals = {
.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex), .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock), .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
#ifdef CONFIG_POSIX_TIMERS #ifdef CONFIG_POSIX_TIMERS
.posix_timers = HLIST_HEAD_INIT, .posix_timers = HLIST_HEAD_INIT,
.cputimer = { .ignored_posix_timers = HLIST_HEAD_INIT,
.cputimer = {
.cputime_atomic = INIT_CPUTIME_ATOMIC, .cputime_atomic = INIT_CPUTIME_ATOMIC,
}, },
#endif #endif

1
kernel/fork.c
View File

@ -1864,6 +1864,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
#ifdef CONFIG_POSIX_TIMERS #ifdef CONFIG_POSIX_TIMERS
INIT_HLIST_HEAD(&sig->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); hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
sig->real_timer.function = it_real_fn; sig->real_timer.function = it_real_fn;
#endif #endif