Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <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
+13
+2
include/linux/posix-timers.h
+2
include/linux/posix-timers.h
···
12
12
13
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struct kernel_siginfo;
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struct task_struct;
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+
struct sigqueue;
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struct k_itimer;
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static inline clockid_t make_process_cpuclock(const unsigned int pid,
···
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}
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void posixtimer_rearm_itimer(struct task_struct *p);
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+
bool posixtimer_init_sigqueue(struct sigqueue *q);
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bool posixtimer_deliver_signal(struct kernel_siginfo *info);
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void posixtimer_free_timer(struct k_itimer *timer);
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+11
kernel/signal.c
+11
kernel/signal.c
···
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__flush_itimer_signals(&tsk->signal->shared_pending);
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}
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+
bool posixtimer_init_sigqueue(struct sigqueue *q)
1909
+
{
1910
+
struct ucounts *ucounts = sig_get_ucounts(current, -1, 0);
1911
+
1912
+
if (!ucounts)
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+
return false;
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+
clear_siginfo(&q->info);
1915
+
__sigqueue_init(q, ucounts, SIGQUEUE_PREALLOC);
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+
return true;
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+
}
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+
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struct sigqueue *sigqueue_alloc(void)
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{
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return __sigqueue_alloc(-1, current, GFP_KERNEL, 0, SIGQUEUE_PREALLOC);