kprobes: Lock kprobe_mutex while showing kprobe_blacklist (4fdd8887) · Commits · 戴 / test

Lock kprobe_mutex while showing kprobe_blacklist to prevent updating the kprobe_blacklist. Signed-off-by:

kernel/kprobes.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -2420,6 +2420,7 @@ static const struct file_operations debugfs_kprobes_operations = {
		/* kprobes/blacklist -- shows which functions can not be probed */
		static void kprobe_blacklist_seq_start(struct seq_file m, loff_t *pos)
		{
		mutex_lock(&kprobe_mutex);
		return seq_list_start(&kprobe_blacklist, *pos);
		}

		@@ -2446,10 +2447,15 @@ static int kprobe_blacklist_seq_show(struct seq_file m, void v)
		return 0;
		}

		static void kprobe_blacklist_seq_stop(struct seq_file f, void v)
		{
		mutex_unlock(&kprobe_mutex);
		}

		static const struct seq_operations kprobe_blacklist_seq_ops = {
		.start = kprobe_blacklist_seq_start,
		.next = kprobe_blacklist_seq_next,
		.stop = kprobe_seq_stop, /* Reuse void function */
		.stop = kprobe_blacklist_seq_stop,
		.show = kprobe_blacklist_seq_show,
		};