format-security: move static strings to const

While examining output from trial builds with -Wformat-security enabled,
many strings were found that should be defined as "const", or as a char
array instead of char pointer.  This makes some static analysis easier,
by producing fewer false positives.

As these are all trivial changes, it seemed best to put them all in a
single patch rather than chopping them up per maintainer.

Link: http://lkml.kernel.org/r/20170405214711.GA5711@beast
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Jes Sorensen <jes@trained-monkey.org>	[runner.c]
Cc: Tony Lindgren <tony@atomide.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Yisen Zhuang <yisen.zhuang@huawei.com>
Cc: Salil Mehta <salil.mehta@huawei.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Mugunthan V N <mugunthanvnm@ti.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: Jarod Wilson <jarod@redhat.com>
Cc: Florian Westphal <fw@strlen.de>
Cc: Antonio Quartulli <a@unstable.cc>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Kejian Yan <yankejian@huawei.com>
Cc: Daode Huang <huangdaode@hisilicon.com>
Cc: Qianqian Xie <xieqianqian@huawei.com>
Cc: Philippe Reynes <tremyfr@gmail.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Christian Gromm <christian.gromm@microchip.com>
Cc: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Cc: Jason Litzinger <jlitzingerdev@gmail.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

15 files changed, 23 insertions, 20 deletions

diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c
index 50aa9ba91f25..0d7b577e0ff0 100644
--- a/drivers/char/dsp56k.c
+++ b/drivers/char/dsp56k.c
@@ -489,7 +489,7 @@ static const struct file_operations dsp56k_fops = {
 
 /****** Init and module functions ******/
 
-static char banner[] __initdata = KERN_INFO "DSP56k driver installed\n";
+static const char banner[] __initconst = KERN_INFO "DSP56k driver installed\n";
 
 static int __init dsp56k_init_driver(void)
 {
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index 0b5bf135b090..062d71434e47 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1171,7 +1171,8 @@ static struct cpufreq_driver cpufreq_amd64_driver = {
 
 static void __request_acpi_cpufreq(void)
 {
-	const char *cur_drv, *drv = "acpi-cpufreq";
+	const char drv[] = "acpi-cpufreq";
+	const char *cur_drv;
 
 	cur_drv = cpufreq_get_current_driver();
 	if (!cur_drv)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index a0ea3241c651..1f178b878e42 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -2446,7 +2446,7 @@ EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
 int __init drm_fb_helper_modinit(void)
 {
 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
-	const char *name = "fbcon";
+	const char name[] = "fbcon";
 	struct module *fbcon;
 
 	mutex_lock(&module_mutex);
diff --git a/drivers/net/ethernet/amd/atarilance.c b/drivers/net/ethernet/amd/atarilance.c
index 796c37a5bbde..c5b81268c284 100644
--- a/drivers/net/ethernet/amd/atarilance.c
+++ b/drivers/net/ethernet/amd/atarilance.c
@@ -42,8 +42,8 @@
 
 */
 
-static char version[] = "atarilance.c: v1.3 04/04/96 "
-					   "Roman.Hodek@informatik.uni-erlangen.de\n";
+static const char version[] = "atarilance.c: v1.3 04/04/96 "
+			      "Roman.Hodek@informatik.uni-erlangen.de\n";
 
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
diff --git a/drivers/net/ethernet/amd/declance.c b/drivers/net/ethernet/amd/declance.c
index 6c98901f1b89..82cc81385033 100644
--- a/drivers/net/ethernet/amd/declance.c
+++ b/drivers/net/ethernet/amd/declance.c
@@ -72,7 +72,7 @@
 #include <asm/dec/machtype.h>
 #include <asm/dec/system.h>
 
-static char version[] =
+static const char version[] =
 "declance.c: v0.011 by Linux MIPS DECstation task force\n";
 
 MODULE_AUTHOR("Linux MIPS DECstation task force");
diff --git a/drivers/net/ethernet/amd/sun3lance.c b/drivers/net/ethernet/amd/sun3lance.c
index 12bb4f1489fc..77b1db267730 100644
--- a/drivers/net/ethernet/amd/sun3lance.c
+++ b/drivers/net/ethernet/amd/sun3lance.c
@@ -21,7 +21,8 @@
 
 */
 
-static char *version = "sun3lance.c: v1.2 1/12/2001  Sam Creasey (sammy@sammy.net)\n";
+static const char version[] =
+"sun3lance.c: v1.2 1/12/2001  Sam Creasey (sammy@sammy.net)\n";
 
 #include <linux/module.h>
 #include <linux/stddef.h>
diff --git a/drivers/net/ethernet/cirrus/mac89x0.c b/drivers/net/ethernet/cirrus/mac89x0.c
index b600fbbbf679..f910f0f386d6 100644
--- a/drivers/net/ethernet/cirrus/mac89x0.c
+++ b/drivers/net/ethernet/cirrus/mac89x0.c
@@ -56,7 +56,7 @@
   local_irq_{dis,en}able()
 */
 
-static char *version =
+static const char version[] =
 "cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>\n";
 
 /* ======================= configure the driver here ======================= */
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h
index 24dfba53a0f2..bbc0a98e7ca3 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h
@@ -405,7 +405,7 @@ struct mac_driver {
 };
 
 struct mac_stats_string {
-	char desc[ETH_GSTRING_LEN];
+	const char desc[ETH_GSTRING_LEN];
 	unsigned long offset;
 };
 
diff --git a/drivers/net/ethernet/natsemi/sonic.h b/drivers/net/ethernet/natsemi/sonic.h
index 07091dd27e5d..7b0a8db57af9 100644
--- a/drivers/net/ethernet/natsemi/sonic.h
+++ b/drivers/net/ethernet/natsemi/sonic.h
@@ -444,7 +444,7 @@ static inline __u16 sonic_rra_get(struct net_device* dev, int entry,
 			     (entry * SIZEOF_SONIC_RR) + offset);
 }
 
-static const char *version =
+static const char version[] =
     "sonic.c:v0.92 20.9.98 tsbogend@alpha.franken.de\n";
 
 #endif /* SONIC_H */
diff --git a/drivers/net/ethernet/toshiba/tc35815.c b/drivers/net/ethernet/toshiba/tc35815.c
index 3dadee1080b9..d9db8a06afd2 100644
--- a/drivers/net/ethernet/toshiba/tc35815.c
+++ b/drivers/net/ethernet/toshiba/tc35815.c
@@ -23,7 +23,7 @@
  */
 
 #define DRV_VERSION	"1.39"
-static const char *version = "tc35815.c:v" DRV_VERSION "\n";
+static const char version[] = "tc35815.c:v" DRV_VERSION "\n";
 #define MODNAME			"tc35815"
 
 #include <linux/module.h>
diff --git a/drivers/net/fddi/defxx.c b/drivers/net/fddi/defxx.c
index b0de8ecd7fe8..f4a816cf012a 100644
--- a/drivers/net/fddi/defxx.c
+++ b/drivers/net/fddi/defxx.c
@@ -228,7 +228,7 @@
 #define DRV_VERSION "v1.11"
 #define DRV_RELDATE "2014/07/01"
 
-static char version[] =
+static const char version[] =
 	DRV_NAME ": " DRV_VERSION " " DRV_RELDATE
 	"  Lawrence V. Stefani and others\n";
 
diff --git a/drivers/net/hippi/rrunner.c b/drivers/net/hippi/rrunner.c
index dd7fc6659ad4..9b0d6148e994 100644
--- a/drivers/net/hippi/rrunner.c
+++ b/drivers/net/hippi/rrunner.c
@@ -60,7 +60,8 @@ MODULE_AUTHOR("Jes Sorensen <jes@wildopensource.com>");
 MODULE_DESCRIPTION("Essential RoadRunner HIPPI driver");
 MODULE_LICENSE("GPL");
 
-static char version[] = "rrunner.c: v0.50 11/11/2002  Jes Sorensen (jes@wildopensource.com)\n";
+static const char version[] =
+"rrunner.c: v0.50 11/11/2002  Jes Sorensen (jes@wildopensource.com)\n";
 
 
 static const struct net_device_ops rr_netdev_ops = {
diff --git a/drivers/staging/most/mostcore/core.c b/drivers/staging/most/mostcore/core.c
index 675b2a9e66c1..069269db394c 100644
--- a/drivers/staging/most/mostcore/core.c
+++ b/drivers/staging/most/mostcore/core.c
@@ -82,7 +82,7 @@ struct most_inst_obj {
 
 static const struct {
 	int most_ch_data_type;
-	char *name;
+	const char *name;
 } ch_data_type[] = {
 	{ MOST_CH_CONTROL, "control\n" },
 	{ MOST_CH_ASYNC, "async\n" },
diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
index e94aea8c0d05..7b2a466616d6 100644
--- a/drivers/tty/n_hdlc.c
+++ b/drivers/tty/n_hdlc.c
@@ -939,11 +939,11 @@ static struct n_hdlc_buf *n_hdlc_buf_get(struct n_hdlc_buf_list *buf_list)
 	return buf;
 }	/* end of n_hdlc_buf_get() */
 
-static char hdlc_banner[] __initdata =
+static const char hdlc_banner[] __initconst =
 	KERN_INFO "HDLC line discipline maxframe=%u\n";
-static char hdlc_register_ok[] __initdata =
+static const char hdlc_register_ok[] __initconst =
 	KERN_INFO "N_HDLC line discipline registered.\n";
-static char hdlc_register_fail[] __initdata =
+static const char hdlc_register_fail[] __initconst =
 	KERN_ERR "error registering line discipline: %d\n";
 
 static int __init n_hdlc_init(void)
@@ -968,9 +968,9 @@ static int __init n_hdlc_init(void)
 	
 }	/* end of init_module() */
 
-static char hdlc_unregister_ok[] __exitdata =
+static const char hdlc_unregister_ok[] __exitdata =
 	KERN_INFO "N_HDLC: line discipline unregistered\n";
-static char hdlc_unregister_fail[] __exitdata =
+static const char hdlc_unregister_fail[] __exitdata =
 	KERN_ERR "N_HDLC: can't unregister line discipline (err = %d)\n";
 
 static void __exit n_hdlc_exit(void)
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index c334bcc59c64..a93a3167a9c6 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -986,7 +986,7 @@ static struct platform_driver asc_serial_driver = {
 static int __init asc_init(void)
 {
 	int ret;
-	static char banner[] __initdata =
+	static const char banner[] __initconst =
 		KERN_INFO "STMicroelectronics ASC driver initialized\n";
 
 	printk(banner);