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signal: Provide posixtimer_sigqueue_init()

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To cure the SIG_IGN handling for posix interval timers, the preallocated
sigqueue needs to be embedded into struct k_itimer to prevent life time
races of all sorts.

Provide a new function to initialize the embedded sigqueue to prepare for
that.

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/20241105064213.450427515@linutronix.de
This commit is contained in:
Thomas Gleixner
2024-11-05 09:14:39 +01:00
parent 5cac427f79
commit 54f1dd642f
2 changed files with 13 additions and 0 deletions
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2
include/linux/posix-timers.h
View File

@@ -12,6 +12,7 @@
struct kernel_siginfo;
struct task_struct;
struct sigqueue;
struct k_itimer;
static inline clockid_t make_process_cpuclock(const unsigned int pid,
@@ -106,6 +107,7 @@ static inline void posix_cputimers_rt_watchdog(struct posix_cputimers *pct,
}
void posixtimer_rearm_itimer(struct task_struct *p);
bool posixtimer_init_sigqueue(struct sigqueue *q);
bool posixtimer_deliver_signal(struct kernel_siginfo *info);
void posixtimer_free_timer(struct k_itimer *timer);

11
kernel/signal.c
View File

@@ -1905,6 +1905,17 @@ void flush_itimer_signals(void)
__flush_itimer_signals(&tsk->signal->shared_pending);
}
bool posixtimer_init_sigqueue(struct sigqueue *q)
{
struct ucounts *ucounts = sig_get_ucounts(current, -1, 0);
if (!ucounts)
return false;
clear_siginfo(&q->info);
__sigqueue_init(q, ucounts, SIGQUEUE_PREALLOC);
return true;
}
struct sigqueue *sigqueue_alloc(void)
{
return __sigqueue_alloc(-1, current, GFP_KERNEL, 0, SIGQUEUE_PREALLOC);