Commit c9257238 authored May 07, 2019 by Ben Hutchings Committed by Greg Kroah-Hartman May 10, 2019

timer/debug: Change /proc/timer_stats from 0644 to 0600



The timer_stats facility should filter and translate PIDs if opened
from a non-initial PID namespace, to avoid leaking information about
the wider system.  It should also not show kernel virtual addresses.
Unfortunately it has now been removed upstream (as redundant)
instead of being fixed.

For stable, fix the leak by restricting access to root only.  A
similar change was already made for the /proc/timer_list file.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent bab022db

kernel/time/timer_stats.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -417,7 +417,7 @@ static int __init init_tstats_procfs(void)
		{
		struct proc_dir_entry *pe;

		pe = proc_create("timer_stats", 0644, NULL, &tstats_fops);
		pe = proc_create("timer_stats", 0600, NULL, &tstats_fops);
		if (!pe)
		return -ENOMEM;
		return 0;