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kprobes: Lock kprobe_mutex while showing kprobe_blacklist 

Lock kprobe_mutex while showing kprobe_blacklist to prevent updating the
kprobe_blacklist.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134059.571125195@linutronix.de
This commit is contained in:
Masami Hiramatsu 2020-03-26 23:49:36 +09:00 committed by Thomas Gleixner
parent 2ef96a5bb1
commit 4fdd88877e
1 changed files with 7 additions and 1 deletions
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8
kernel/kprobes.c
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@ -2420,6 +2420,7 @@ static const struct file_operations debugfs_kprobes_operations = {
/* kprobes/blacklist -- shows which functions can not be probed */ /* kprobes/blacklist -- shows which functions can not be probed */
static void *kprobe_blacklist_seq_start(struct seq_file *m, loff_t *pos) static void *kprobe_blacklist_seq_start(struct seq_file *m, loff_t *pos)
{ {
mutex_lock(&kprobe_mutex);
return seq_list_start(&kprobe_blacklist, *pos); 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; 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 = { static const struct seq_operations kprobe_blacklist_seq_ops = {
.start = kprobe_blacklist_seq_start, .start = kprobe_blacklist_seq_start,
.next = kprobe_blacklist_seq_next, .next = kprobe_blacklist_seq_next,
.stop = kprobe_seq_stop, /* Reuse void function */ .stop = kprobe_blacklist_seq_stop,
.show = kprobe_blacklist_seq_show, .show = kprobe_blacklist_seq_show,
}; };