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authorBen Hutchings <ben@decadent.org.uk>2019-05-07 20:04:04 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-05-10 17:52:11 +0200
commitc9257238740ee492574cf686313037be7470e7ec (patch)
tree5f25d34d1f59d6ef80f2755bf50105b223fe542f
parentbab022db454a4c074054f30344416f12821ca11f (diff)
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>
-rw-r--r--kernel/time/timer_stats.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c
index 087204c733eb..c74920f318c5 100644
--- a/kernel/time/timer_stats.c
+++ b/kernel/time/timer_stats.c
@@ -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;