posix-cpu-timers: Use common permission check in posix_cpu_timer_create() (e5a8b65b) · Commits · 戴 / test

kernel/time/posix-cpu-timers.c

+3 −32

Original line number	Diff line number	Diff line
		@@ -316,44 +316,15 @@ static int posix_cpu_clock_get(const clockid_t clock, struct timespec64 *tp)
		*/
		static int posix_cpu_timer_create(struct k_itimer *new_timer)
		{
		int ret = 0;
		const pid_t pid = CPUCLOCK_PID(new_timer->it_clock);
		struct task_struct *p;
		struct task_struct *p = get_task_for_clock(new_timer->it_clock);

		if (CPUCLOCK_WHICH(new_timer->it_clock) >= CPUCLOCK_MAX)
		if (!p)
		return -EINVAL;

		new_timer->kclock = &clock_posix_cpu;

		INIT_LIST_HEAD(&new_timer->it.cpu.entry);

		rcu_read_lock();
		if (CPUCLOCK_PERTHREAD(new_timer->it_clock)) {
		if (pid == 0) {
		p = current;
		} else {
		p = find_task_by_vpid(pid);
		if (p && !same_thread_group(p, current))
		p = NULL;
		}
		} else {
		if (pid == 0) {
		p = current->group_leader;
		} else {
		p = find_task_by_vpid(pid);
		if (p && !has_group_leader_pid(p))
		p = NULL;
		}
		}
		new_timer->it.cpu.task = p;
		if (p) {
		get_task_struct(p);
		} else {
		ret = -EINVAL;
		}
		rcu_read_unlock();

		return ret;
		return 0;
		}

		/*