From: Thomas Gleixner Date: Tue, 5 Nov 2024 08:14:39 +0000 (+0100) Subject: signal: Provide posixtimer_sigqueue_init() X-Git-Tag: v6.13-rc1~171^2~34 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=54f1dd642fd088ba969206f09e7afffad7d9db2c;p=thirdparty%2Fkernel%2Flinux.git signal: Provide posixtimer_sigqueue_init() 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 Reviewed-by: Frederic Weisbecker Acked-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/all/20241105064213.450427515@linutronix.de --- diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index 9740fd0c2933f..200098d27cc04 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -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); diff --git a/kernel/signal.c b/kernel/signal.c index dbd42471cf030..911ed3ab479e7 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -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);