[PATCH] proc: Make /proc/<pid>/io world readable

[Daniel Xu]

/proc/<pid>/io is currently only owner readable. This forces monitoring
programs (such as atop) to run with elevated permissions to collect disk
stats. Changing this file to world readable can add a measure of safety to
userspace.

Signed-off-by: Daniel Xu <dxu@xxxxxxxxx>
---
 fs/proc/base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index ebea9501afb8..1d1c1d680e16 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3076,7 +3076,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 	REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
 #endif
 #ifdef CONFIG_TASK_IO_ACCOUNTING
-	ONE("io",	S_IRUSR, proc_tgid_io_accounting),
+	ONE("io",	S_IRUGO, proc_tgid_io_accounting),
 #endif
 #ifdef CONFIG_USER_NS
 	REG("uid_map",    S_IRUGO|S_IWUSR, proc_uid_map_operations),
@@ -3473,7 +3473,7 @@ static const struct pid_entry tid_base_stuff[] = {
 	REG("fail-nth", 0644, proc_fail_nth_operations),
 #endif
 #ifdef CONFIG_TASK_IO_ACCOUNTING
-	ONE("io",	S_IRUSR, proc_tid_io_accounting),
+	ONE("io",	S_IRUGO, proc_tid_io_accounting),
 #endif
 #ifdef CONFIG_USER_NS
 	REG("uid_map",    S_IRUGO|S_IWUSR, proc_uid_map_operations),
-- 
2.21.0