From: Ben Hutchings Date: Tue, 7 May 2019 19:04:04 +0000 (+0100) Subject: timer/debug: Change /proc/timer_stats from 0644 to 0600 X-Git-Tag: v3.18.140~25 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b784e7a613d1df6f80ff229ec5d8ce45fb7222df;p=thirdparty%2Fkernel%2Fstable.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c index 1fb08f21302ec..0334899f1d3e8 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;