linux-hardening - [PATCH v2 01/18] watchdog/core: remove sysctl handlers from public header

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Message-Id: <20231204-const-sysctl-v2-1-7a5060b11447@weissschuh.net>
Date: Mon, 04 Dec 2023 08:52:14 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Kees Cook <keescook@...omium.org>, 
 "Gustavo A. R. Silva" <gustavoars@...nel.org>, 
 Luis Chamberlain <mcgrof@...nel.org>, Iurii Zaikin <yzaikin@...gle.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Joel Granados <j.granados@...sung.com>
Cc: linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-fsdevel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v2 01/18] watchdog/core: remove sysctl handlers from public
 header

The functions are only used in the file where they are defined.
Remove them from the header and make them static.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 include/linux/nmi.h |  7 -------
 kernel/watchdog.c   | 10 +++++-----
 2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index e92e378df000..f53438eae815 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -216,13 +216,6 @@ void watchdog_update_hrtimer_threshold(u64 period);
 static inline void watchdog_update_hrtimer_threshold(u64 period) { }
 #endif
 
-struct ctl_table;
-int proc_watchdog(struct ctl_table *, int, void *, size_t *, loff_t *);
-int proc_nmi_watchdog(struct ctl_table *, int , void *, size_t *, loff_t *);
-int proc_soft_watchdog(struct ctl_table *, int , void *, size_t *, loff_t *);
-int proc_watchdog_thresh(struct ctl_table *, int , void *, size_t *, loff_t *);
-int proc_watchdog_cpumask(struct ctl_table *, int, void *, size_t *, loff_t *);
-
 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
 #include <asm/nmi.h>
 #endif
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 5cd6d4e26915..0fe72e89627d 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -772,7 +772,7 @@ static int proc_watchdog_common(int which, struct ctl_table *table, int write,
 /*
  * /proc/sys/kernel/watchdog
  */
-int proc_watchdog(struct ctl_table *table, int write,
+static int proc_watchdog(struct ctl_table *table, int write,
 		  void *buffer, size_t *lenp, loff_t *ppos)
 {
 	return proc_watchdog_common(WATCHDOG_HARDLOCKUP_ENABLED |
@@ -783,7 +783,7 @@ int proc_watchdog(struct ctl_table *table, int write,
 /*
  * /proc/sys/kernel/nmi_watchdog
  */
-int proc_nmi_watchdog(struct ctl_table *table, int write,
+static int proc_nmi_watchdog(struct ctl_table *table, int write,
 		      void *buffer, size_t *lenp, loff_t *ppos)
 {
 	if (!watchdog_hardlockup_available && write)
@@ -795,7 +795,7 @@ int proc_nmi_watchdog(struct ctl_table *table, int write,
 /*
  * /proc/sys/kernel/soft_watchdog
  */
-int proc_soft_watchdog(struct ctl_table *table, int write,
+static int proc_soft_watchdog(struct ctl_table *table, int write,
 			void *buffer, size_t *lenp, loff_t *ppos)
 {
 	return proc_watchdog_common(WATCHDOG_SOFTOCKUP_ENABLED,
@@ -805,7 +805,7 @@ int proc_soft_watchdog(struct ctl_table *table, int write,
 /*
  * /proc/sys/kernel/watchdog_thresh
  */
-int proc_watchdog_thresh(struct ctl_table *table, int write,
+static int proc_watchdog_thresh(struct ctl_table *table, int write,
 			 void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int err, old;
@@ -828,7 +828,7 @@ int proc_watchdog_thresh(struct ctl_table *table, int write,
  * user to specify a mask that will include cpus that have not yet
  * been brought online, if desired.
  */
-int proc_watchdog_cpumask(struct ctl_table *table, int write,
+static int proc_watchdog_cpumask(struct ctl_table *table, int write,
 			  void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int err;

-- 
2.43.0