linux-kernel - [PATCH v2 2/2] rcu: Make rcu update module parameters world-readable

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Date:   Tue, 10 Aug 2021 10:48:16 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     paulmck@...nel.org, josh@...htriplett.org
Cc:     linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        peterz@...radead.org, bigeasy@...utronix.de, tglx@...utronix.de,
        rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com, joel@...lfernandes.org,
        rcu@...r.kernel.org, Juri Lelli <juri.lelli@...hat.com>
Subject: [PATCH v2 2/2] rcu: Make rcu update module parameters world-readable

rcu update module parameters currently don't appear in sysfs and this is
a serviceability issue as it might be needed to access their default
values at runtime.

Fix this issue by changing rcu update module parameters permissions to
world-readable.

Suggested-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Juri Lelli <juri.lelli@...hat.com>
---
 kernel/rcu/update.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index bd551134e2f4..94282dc12bab 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -54,11 +54,11 @@
 #define MODULE_PARAM_PREFIX "rcupdate."
 
 #ifndef CONFIG_TINY_RCU
-module_param(rcu_expedited, int, 0);
-module_param(rcu_normal, int, 0);
+module_param(rcu_expedited, int, 0444);
+module_param(rcu_normal, int, 0444);
 static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT);
 #if !defined(CONFIG_PREEMPT_RT) || defined(CONFIG_NO_HZ_FULL)
-module_param(rcu_normal_after_boot, int, 0);
+module_param(rcu_normal_after_boot, int, 0444);
 #endif
 #endif /* #ifndef CONFIG_TINY_RCU */
 
-- 
2.31.1