diff --git a/arch/xtensa/src/common/espressif/esp_dedic_gpio.c b/arch/xtensa/src/common/espressif/esp_dedic_gpio.c
index bea7fd8506e..444f05f5fab 100644
--- a/arch/xtensa/src/common/espressif/esp_dedic_gpio.c
+++ b/arch/xtensa/src/common/espressif/esp_dedic_gpio.c
@@ -684,7 +684,7 @@ struct file *esp_dedic_gpio_new_bundle(
   dedic_gpio_common[cpu].refs++;
 
   register_driver(config->path, &dedic_gpio_ops,
-                  0666, priv);
+                  0600, priv);
   return (struct file *)priv;
 }
 
diff --git a/arch/xtensa/src/common/espressif/esp_nxdiag.c b/arch/xtensa/src/common/espressif/esp_nxdiag.c
index 5e3df76836c..0ab56827077 100644
--- a/arch/xtensa/src/common/espressif/esp_nxdiag.c
+++ b/arch/xtensa/src/common/espressif/esp_nxdiag.c
@@ -313,7 +313,7 @@ static ssize_t esp_nxdiag_read(struct file *filep,
 
 static int esp_nxdiag_register(void)
 {
-  return register_driver("/dev/nxdiag", &g_nxdiagops, 0440, NULL);
+  return register_driver("/dev/nxdiag", &g_nxdiagops, 0400, NULL);
 }
 
 /****************************************************************************
diff --git a/arch/xtensa/src/common/espressif/esp_temperature_sensor.c b/arch/xtensa/src/common/espressif/esp_temperature_sensor.c
index 242baee5770..ee34d532934 100644
--- a/arch/xtensa/src/common/espressif/esp_temperature_sensor.c
+++ b/arch/xtensa/src/common/espressif/esp_temperature_sensor.c
@@ -415,7 +415,7 @@ static void esp_temp_sensor_register(struct esp_temp_priv_s *priv)
 {
 #ifndef CONFIG_ESPRESSIF_TEMP_UORB
   register_driver(CONFIG_ESPRESSIF_TEMP_PATH, &g_esp_temp_sensor_fops,
-                  0666, priv);
+                  0600, priv);
 #else
   priv->lower.type = SENSOR_TYPE_TEMPERATURE;
   sensor_register(&priv->lower, CONFIG_ESPRESSIF_TEMP_PATH_DEVNO);
diff --git a/boards/arm/cxd56xx/drivers/sensors/ak09912_scu.c b/boards/arm/cxd56xx/drivers/sensors/ak09912_scu.c
index 5040e61ec11..9b614a8e307 100644
--- a/boards/arm/cxd56xx/drivers/sensors/ak09912_scu.c
+++ b/boards/arm/cxd56xx/drivers/sensors/ak09912_scu.c
@@ -556,7 +556,7 @@ int ak09912_scu_register(const char *devpath, int minor,
   /* Register the character driver */
 
   snprintf(path, sizeof(path), "%s%d", devpath, minor);
-  ret = register_driver(path, &g_ak09912fops, 0660, priv);
+  ret = register_driver(path, &g_ak09912fops, 0640, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/boards/arm/cxd56xx/drivers/sensors/bm1383glv_scu.c b/boards/arm/cxd56xx/drivers/sensors/bm1383glv_scu.c
index 98558d46a4e..5f6df440553 100644
--- a/boards/arm/cxd56xx/drivers/sensors/bm1383glv_scu.c
+++ b/boards/arm/cxd56xx/drivers/sensors/bm1383glv_scu.c
@@ -541,7 +541,7 @@ int bm1383glv_register(const char *devpath, int minor,
   /* Register the character driver */
 
   snprintf(path, sizeof(path), "%s%d", devpath, minor);
-  ret = register_driver(path, &g_bm1383glvfops, 0660, priv);
+  ret = register_driver(path, &g_bm1383glvfops, 0640, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/boards/arm/cxd56xx/drivers/sensors/bm1422gmv_scu.c b/boards/arm/cxd56xx/drivers/sensors/bm1422gmv_scu.c
index 5b6379c2b00..995333377c2 100644
--- a/boards/arm/cxd56xx/drivers/sensors/bm1422gmv_scu.c
+++ b/boards/arm/cxd56xx/drivers/sensors/bm1422gmv_scu.c
@@ -525,7 +525,7 @@ int bm1422gmv_register(const char *devpath, int minor,
   /* Register the character driver */
 
   snprintf(path, sizeof(path), "%s%d", devpath, minor);
-  ret = register_driver(path, &g_bm1422gmvfops, 0660, priv);
+  ret = register_driver(path, &g_bm1422gmvfops, 0640, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/boards/arm/samv7/common/src/sam_progmem.c b/boards/arm/samv7/common/src/sam_progmem.c
index 2145f51dcc6..a6f663498f1 100644
--- a/boards/arm/samv7/common/src/sam_progmem.c
+++ b/boards/arm/samv7/common/src/sam_progmem.c
@@ -79,7 +79,7 @@ static int sam_progmem_register_driver(int minor, struct mtd_dev_s *mtd,
 
   /* Register the MTD driver */
 
-  ret = register_mtddriver(devpath, mtd, 0755, NULL);
+  ret = register_mtddriver(devpath, mtd, 0750, NULL);
   if (ret < 0)
     {
       ferr("ERROR: register_mtddriver %s failed: %d\n", devpath, ret);
diff --git a/boards/arm/stm32l1/stm32ldiscovery/src/stm32_lcd.c b/boards/arm/stm32l1/stm32ldiscovery/src/stm32_lcd.c
index 379abcfa7bd..925d157661b 100644
--- a/boards/arm/stm32l1/stm32ldiscovery/src/stm32_lcd.c
+++ b/boards/arm/stm32l1/stm32ldiscovery/src/stm32_lcd.c
@@ -1584,7 +1584,7 @@ int stm32_slcd_initialize(void)
 
       /* Register the LCD device driver */
 
-      ret = register_driver("/dev/slcd0", &g_slcdops, 0644, &g_slcdstate);
+      ret = register_driver("/dev/slcd0", &g_slcdops, 0640, &g_slcdstate);
       g_slcdstate.initialized = true;
 
       /* Then clear the display */
diff --git a/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c b/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
index e9773e4a0f6..03dd0fabe1e 100644
--- a/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
+++ b/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
@@ -1371,7 +1371,7 @@ int pic32mx_tsc_setup(int minor)
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
   iinfo("Registering %s\n", devname);
 
-  ret = register_driver(devname, &g_tc_fops, 0660, priv);
+  ret = register_driver(devname, &g_tc_fops, 0640, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c b/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c
index d71d6562329..910c56bfa66 100644
--- a/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c
+++ b/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c
@@ -1076,7 +1076,7 @@ int up_lcd1602_initialize(void)
 
       /* Register the LCD device driver */
 
-      ret = register_driver("/dev/lcd1602", &g_lcdops, 0644, &g_lcd1602);
+      ret = register_driver("/dev/lcd1602", &g_lcdops, 0640, &g_lcd1602);
       g_lcd1602.initialized = true;
     }
 
diff --git a/drivers/coresight/coresight_etb.c b/drivers/coresight/coresight_etb.c
index 2814fb9120f..ddf96c548d6 100644
--- a/drivers/coresight/coresight_etb.c
+++ b/drivers/coresight/coresight_etb.c
@@ -463,7 +463,7 @@ etb_register(FAR const struct coresight_desc_s *desc)
     }
 
   snprintf(pathname, sizeof(pathname), "/dev/%s", desc->name);
-  ret = register_driver(pathname, &g_etb_fops, 0444, etbdev);
+  ret = register_driver(pathname, &g_etb_fops, 0400, etbdev);
   if (ret < 0)
     {
       cserr("%s:driver register failed\n", desc->name);
diff --git a/drivers/coresight/coresight_tmc_etf.c b/drivers/coresight/coresight_tmc_etf.c
index 104d16e57c6..f79f76351e2 100644
--- a/drivers/coresight/coresight_tmc_etf.c
+++ b/drivers/coresight/coresight_tmc_etf.c
@@ -511,7 +511,7 @@ int tmc_etf_register(FAR struct coresight_tmc_dev_s * tmcdev,
         }
 
       snprintf(pathname, sizeof(pathname), "/dev/%s", desc->name);
-      ret = register_driver(pathname, &g_tmc_fops, 0444, tmcdev);
+      ret = register_driver(pathname, &g_tmc_fops, 0400, tmcdev);
       if (ret < 0)
         {
           cserr("%s:driver register failed\n", desc->name);
diff --git a/drivers/i3c/i3c_driver.c b/drivers/i3c/i3c_driver.c
index 4cc6d171e3c..8befcdb2d63 100644
--- a/drivers/i3c/i3c_driver.c
+++ b/drivers/i3c/i3c_driver.c
@@ -384,7 +384,7 @@ int i3c_register(FAR struct i3c_master_controller *master, int bus)
   /* Create the character device name */
 
   snprintf(devname, sizeof(devname), DEVNAME_FMT, bus);
-  ret = register_driver(devname, &g_i3cdrvr_fops, 0666, priv);
+  ret = register_driver(devname, &g_i3cdrvr_fops, 0600, priv);
   if (ret < 0)
     {
       /* Free the device structure if we failed to create the character
diff --git a/drivers/input/ads7843e.c b/drivers/input/ads7843e.c
index 3814f650062..73362bdd523 100644
--- a/drivers/input/ads7843e.c
+++ b/drivers/input/ads7843e.c
@@ -1166,7 +1166,7 @@ int ads7843e_register(FAR struct spi_dev_s *spi,
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
   iinfo("Registering %s\n", devname);
 
-  ret = register_driver(devname, &g_ads7843e_fops, 0666, priv);
+  ret = register_driver(devname, &g_ads7843e_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/drivers/input/ajoystick.c b/drivers/input/ajoystick.c
index 32fc7099cd3..389f0e9df9a 100644
--- a/drivers/input/ajoystick.c
+++ b/drivers/input/ajoystick.c
@@ -730,7 +730,7 @@ int ajoy_register(FAR const char *devname,
 
   /* And register the ajoystick driver */
 
-  ret = register_driver(devname, &g_ajoy_fops, 0666, priv);
+  ret = register_driver(devname, &g_ajoy_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/input/button_upper.c b/drivers/input/button_upper.c
index 2375f9cf972..b9ef266c820 100644
--- a/drivers/input/button_upper.c
+++ b/drivers/input/button_upper.c
@@ -810,7 +810,7 @@ int btn_register(FAR const char *devname,
 
   /* And register the button driver */
 
-  ret = register_driver(devname, &g_btn_fops, 0666, priv);
+  ret = register_driver(devname, &g_btn_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/input/cypress_mbr3108.c b/drivers/input/cypress_mbr3108.c
index 427cb903101..5b9aa4a143d 100644
--- a/drivers/input/cypress_mbr3108.c
+++ b/drivers/input/cypress_mbr3108.c
@@ -1105,7 +1105,7 @@ cypress_mbr3108_register(FAR const char *devpath,
 
   nxmutex_init(&priv->devlock);
 
-  ret = register_driver(devpath, &g_mbr3108_fileops, 0666, priv);
+  ret = register_driver(devpath, &g_mbr3108_fileops, 0600, priv);
   if (ret < 0)
     {
       nxmutex_destroy(&priv->devlock);
diff --git a/drivers/input/djoystick.c b/drivers/input/djoystick.c
index 0eb4a524817..6689d59985d 100644
--- a/drivers/input/djoystick.c
+++ b/drivers/input/djoystick.c
@@ -721,7 +721,7 @@ int djoy_register(FAR const char *devname,
 
   /* And register the djoystick driver */
 
-  ret = register_driver(devname, &g_djoy_fops, 0666, priv);
+  ret = register_driver(devname, &g_djoy_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/input/ff_upper.c b/drivers/input/ff_upper.c
index 4c24ab62efa..27fbcf6091b 100644
--- a/drivers/input/ff_upper.c
+++ b/drivers/input/ff_upper.c
@@ -543,7 +543,7 @@ int ff_register(FAR struct ff_lowerhalf_s *lower, FAR const char *path,
   upper->effects     = (FAR struct ff_effect_s *)(upper + 1);
   nxmutex_init(&upper->lock);
 
-  ret = register_driver(path, &g_ff_fops, 0666, upper);
+  ret = register_driver(path, &g_ff_fops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->lock);
diff --git a/drivers/input/gt9xx.c b/drivers/input/gt9xx.c
index 169a9001974..30ebf183ad6 100644
--- a/drivers/input/gt9xx.c
+++ b/drivers/input/gt9xx.c
@@ -931,7 +931,7 @@ int gt9xx_register(FAR const char *devpath,
 
   /* Register the Touch Input Driver */
 
-  ret = register_driver(devpath, &g_gt9xx_fileops, 0666, priv);
+  ret = register_driver(devpath, &g_gt9xx_fileops, 0600, priv);
   if (ret < 0)
     {
       nxmutex_destroy(&priv->devlock);
diff --git a/drivers/input/keyboard_upper.c b/drivers/input/keyboard_upper.c
index 73c80d1c748..5436a270e52 100644
--- a/drivers/input/keyboard_upper.c
+++ b/drivers/input/keyboard_upper.c
@@ -347,7 +347,7 @@ int keyboard_register(FAR struct keyboard_lowerhalf_s *lower,
   list_initialize(&upper->head);
   nxmutex_init(&upper->lock);
 
-  ret = register_driver(path, &g_keyboard_fops, 0666, upper);
+  ret = register_driver(path, &g_keyboard_fops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->lock);
diff --git a/drivers/input/max11802.c b/drivers/input/max11802.c
index b566f6495d2..be27523f9a8 100644
--- a/drivers/input/max11802.c
+++ b/drivers/input/max11802.c
@@ -1200,7 +1200,7 @@ int max11802_register(FAR struct spi_dev_s *spi,
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
   iinfo("Registering %s\n", devname);
 
-  ret = register_driver(devname, &g_max11802_fops, 0666, priv);
+  ret = register_driver(devname, &g_max11802_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/drivers/input/mouse_upper.c b/drivers/input/mouse_upper.c
index 67a4b2e897a..a648d16c420 100644
--- a/drivers/input/mouse_upper.c
+++ b/drivers/input/mouse_upper.c
@@ -379,7 +379,7 @@ int mouse_register(FAR struct mouse_lowerhalf_s *lower,
   list_initialize(&upper->head);
   nxmutex_init(&upper->lock);
 
-  ret = register_driver(path, &g_mouse_fops, 0666, upper);
+  ret = register_driver(path, &g_mouse_fops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->lock);
diff --git a/drivers/input/mxt.c b/drivers/input/mxt.c
index 3a57e15ee00..e41610ca908 100644
--- a/drivers/input/mxt.c
+++ b/drivers/input/mxt.c
@@ -1883,7 +1883,7 @@ int mxt_register(FAR struct i2c_master_s *i2c,
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
   iinfo("Registering %s\n", devname);
 
-  ret = register_driver(devname, &g_mxt_fops, 0666, priv);
+  ret = register_driver(devname, &g_mxt_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/drivers/input/nunchuck.c b/drivers/input/nunchuck.c
index b82bcb2d214..aa39bbf573c 100644
--- a/drivers/input/nunchuck.c
+++ b/drivers/input/nunchuck.c
@@ -564,7 +564,7 @@ int nunchuck_register(FAR const char *devname, FAR struct i2c_master_s *i2c)
 
   /* And register the nunchuck driver */
 
-  ret = register_driver(devname, &g_nunchuck_fops, 0666, priv);
+  ret = register_driver(devname, &g_nunchuck_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/input/spq10kbd.c b/drivers/input/spq10kbd.c
index 106e242fe83..b6693b13395 100644
--- a/drivers/input/spq10kbd.c
+++ b/drivers/input/spq10kbd.c
@@ -1032,7 +1032,7 @@ int spq10kbd_register(FAR struct i2c_master_s *i2c,
 
   snprintf(kbddevname, sizeof(kbddevname), DEV_FORMAT, kbdminor);
   iinfo("Registering %s\n", kbddevname);
-  ret = register_driver(kbddevname, &g_hidkbd_fops, 0666, priv);
+  ret = register_driver(kbddevname, &g_hidkbd_fops, 0600, priv);
 
 #ifdef CONFIG_SPQ10KBD_DJOY
   iinfo("Registering %s\n", joydevname);
diff --git a/drivers/input/stmpe811_tsc.c b/drivers/input/stmpe811_tsc.c
index 2576a4a2c45..2f4080c2763 100644
--- a/drivers/input/stmpe811_tsc.c
+++ b/drivers/input/stmpe811_tsc.c
@@ -904,7 +904,7 @@ int stmpe811_register(STMPE811_HANDLE handle, int minor)
   /* Register the character driver */
 
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
-  ret = register_driver(devname, &g_stmpe811fops, 0666, priv);
+  ret = register_driver(devname, &g_stmpe811fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: Failed to register driver %s: %d\n", devname, ret);
diff --git a/drivers/input/touchscreen_upper.c b/drivers/input/touchscreen_upper.c
index 81d2e03b729..001783f3e39 100644
--- a/drivers/input/touchscreen_upper.c
+++ b/drivers/input/touchscreen_upper.c
@@ -492,7 +492,7 @@ int touch_register(FAR struct touch_lowerhalf_s *lower,
   list_initialize(&upper->head);
   nxmutex_init(&upper->lock);
 
-  ret = register_driver(path, &g_touch_fops, 0666, upper);
+  ret = register_driver(path, &g_touch_fops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->lock);
diff --git a/drivers/input/tsc2007.c b/drivers/input/tsc2007.c
index 5dcd25b240f..780dfc9e1b9 100644
--- a/drivers/input/tsc2007.c
+++ b/drivers/input/tsc2007.c
@@ -1247,7 +1247,7 @@ int tsc2007_register(FAR struct i2c_master_s *dev,
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
   iinfo("Registering %s\n", devname);
 
-  ret = register_driver(devname, &g_tsc2007_fops, 0666, priv);
+  ret = register_driver(devname, &g_tsc2007_fops, 0600, priv);
   if (ret < 0)
     {
       ierr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/drivers/ioexpander/gpio.c b/drivers/ioexpander/gpio.c
index 63d3754548c..512a0e19f41 100644
--- a/drivers/ioexpander/gpio.c
+++ b/drivers/ioexpander/gpio.c
@@ -791,7 +791,7 @@ int gpio_pin_register_byname(FAR struct gpio_dev_s *dev,
 
   gpioinfo("Registering %s\n", devname);
 
-  return register_driver(devname, &g_gpio_drvrops, 0666, dev);
+  return register_driver(devname, &g_gpio_drvrops, 0600, dev);
 }
 
 /****************************************************************************
diff --git a/drivers/ipcc/ipcc_register.c b/drivers/ipcc/ipcc_register.c
index 401eba2bc5c..a91c372f5b9 100644
--- a/drivers/ipcc/ipcc_register.c
+++ b/drivers/ipcc/ipcc_register.c
@@ -167,7 +167,7 @@ int ipcc_register(FAR struct ipcc_lower_s *ipcc)
   /* Create the character device name */
 
   snprintf(devname, sizeof(devname), DEVNAME_FMT, ipcc->chan);
-  if ((ret = register_driver(devname, &g_ipcc_fops, 0666, priv)))
+  if ((ret = register_driver(devname, &g_ipcc_fops, 0600, priv)))
     {
       goto error;
     }
diff --git a/drivers/lcd/ft80x.c b/drivers/lcd/ft80x.c
index 9b6776d990d..83f6e4ae6c5 100644
--- a/drivers/lcd/ft80x.c
+++ b/drivers/lcd/ft80x.c
@@ -1575,7 +1575,7 @@ int ft80x_register(FAR struct i2c_master_s *i2c,
 
   /* Register the FT80x character driver */
 
-  ret = register_driver(DEVNAME, &g_ft80x_fops, 0666, priv);
+  ret = register_driver(DEVNAME, &g_ft80x_fops, 0600, priv);
   if (ret < 0)
     {
       goto errout_with_interrupts;
diff --git a/drivers/lcd/ht16k33_14seg.c b/drivers/lcd/ht16k33_14seg.c
index fed47d87abe..b46e86acb10 100644
--- a/drivers/lcd/ht16k33_14seg.c
+++ b/drivers/lcd/ht16k33_14seg.c
@@ -1094,7 +1094,7 @@ int ht16k33_register(int devno, FAR struct i2c_master_s *i2c)
 
   /* Register the driver */
 
-  ret = register_driver(devname, &g_ht16k33fops, 0666, priv);
+  ret = register_driver(devname, &g_ht16k33fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/lcd/lcd_dev.c b/drivers/lcd/lcd_dev.c
index fea65ddfe8a..c1d39ca0f61 100644
--- a/drivers/lcd/lcd_dev.c
+++ b/drivers/lcd/lcd_dev.c
@@ -443,7 +443,7 @@ int lcddev_register(int devno)
     }
 
   snprintf(devname, sizeof(devname), "/dev/lcd%i", devno);
-  ret = register_driver(devname, &g_lcddev_fops, 0666, priv);
+  ret = register_driver(devname, &g_lcddev_fops, 0600, priv);
   if (ret < 0)
     {
       goto err;
diff --git a/drivers/lcd/pcf8574_lcd_backpack.c b/drivers/lcd/pcf8574_lcd_backpack.c
index 2e7052dfebd..37145e6c8f2 100644
--- a/drivers/lcd/pcf8574_lcd_backpack.c
+++ b/drivers/lcd/pcf8574_lcd_backpack.c
@@ -1632,7 +1632,7 @@ int pcf8574_lcd_backpack_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_pcf8574_lcd_fops, 0666, priv);
+  ret = register_driver(devpath, &g_pcf8574_lcd_fops, 0600, priv);
   if (ret < 0)
     {
       lcdinfo("Failed to register driver: %d\n", ret);
diff --git a/drivers/lcd/st7032.c b/drivers/lcd/st7032.c
index 7c057cd00d0..2fa7774d9ec 100644
--- a/drivers/lcd/st7032.c
+++ b/drivers/lcd/st7032.c
@@ -1020,7 +1020,7 @@ int st7032_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
 
   /* Register the driver */
 
-  ret = register_driver(devpath, &g_st7032fops, 0666, priv);
+  ret = register_driver(devpath, &g_st7032fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/lcd/tda19988.c b/drivers/lcd/tda19988.c
index cd40b91aecc..520617cee8b 100644
--- a/drivers/lcd/tda19988.c
+++ b/drivers/lcd/tda19988.c
@@ -1682,7 +1682,7 @@ TDA19988_HANDLE tda19988_register(FAR const char *devpath,
 
   /* Register the driver */
 
-  ret = register_driver(devpath, &g_tda19988_fops, 0666, NULL);
+  ret = register_driver(devpath, &g_tda19988_fops, 0600, NULL);
   if (ret < 0)
     {
       lcderr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/drivers/leds/apa102.c b/drivers/leds/apa102.c
index 9e94024a702..f05939270fe 100644
--- a/drivers/leds/apa102.c
+++ b/drivers/leds/apa102.c
@@ -249,7 +249,7 @@ int apa102_register(FAR const char *devpath, FAR struct spi_dev_s *spi)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_apa102fops, 0666, priv);
+  ret = register_driver(devpath, &g_apa102fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/leds/ktd2052.c b/drivers/leds/ktd2052.c
index e17c8df8112..7edb65478cd 100644
--- a/drivers/leds/ktd2052.c
+++ b/drivers/leds/ktd2052.c
@@ -741,7 +741,7 @@ int ktd2052_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_ktd2052_fops, 0666, priv);
+  ret = register_driver(devpath, &g_ktd2052_fops, 0600, priv);
   if (ret < 0)
     {
       kmm_free(priv);
diff --git a/drivers/leds/lp503x.c b/drivers/leds/lp503x.c
index 5e33e762be4..0470053215b 100644
--- a/drivers/leds/lp503x.c
+++ b/drivers/leds/lp503x.c
@@ -947,7 +947,7 @@ int lp503x_register(const char *devpath, struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_lp503x_fileops, 0222, priv);
+  ret = register_driver(devpath, &g_lp503x_fileops, 0200, priv);
   if (ret != OK)
     {
       lederr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/leds/max7219.c b/drivers/leds/max7219.c
index 27cde1dbf5e..752e8455b6c 100644
--- a/drivers/leds/max7219.c
+++ b/drivers/leds/max7219.c
@@ -349,7 +349,7 @@ int max7219_leds_register(FAR const char *devpath, FAR struct spi_dev_s *spi)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_max7219fops, 0666, priv);
+  ret = register_driver(devpath, &g_max7219fops, 0600, priv);
   if (ret < 0)
     {
       lederr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/leds/ncp5623c.c b/drivers/leds/ncp5623c.c
index a19c657ca89..9f13ca144a2 100644
--- a/drivers/leds/ncp5623c.c
+++ b/drivers/leds/ncp5623c.c
@@ -284,7 +284,7 @@ int ncp5623c_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  int const ret = register_driver(devpath, &g_ncp5623c_fileops, 0666, priv);
+  int const ret = register_driver(devpath, &g_ncp5623c_fileops, 0600, priv);
   if (ret != OK)
     {
       lcderr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/leds/pca9635pw.c b/drivers/leds/pca9635pw.c
index 6db451f5359..fe23abb24e6 100644
--- a/drivers/leds/pca9635pw.c
+++ b/drivers/leds/pca9635pw.c
@@ -356,7 +356,7 @@ int pca9635pw_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  int const ret = register_driver(devpath, &g_pca9635pw_fileops, 0222, priv);
+  int const ret = register_driver(devpath, &g_pca9635pw_fileops, 0200, priv);
   if (ret != OK)
     {
       lcderr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/leds/rgbled.c b/drivers/leds/rgbled.c
index f04638b8dcb..9211c09334f 100644
--- a/drivers/leds/rgbled.c
+++ b/drivers/leds/rgbled.c
@@ -496,7 +496,7 @@ int rgbled_register(FAR const char *path, FAR struct pwm_lowerhalf_s *ledr,
   /* Register the PWM device */
 
   lcdinfo("Registering %s\n", path);
-  return register_driver(path, &g_rgbledops, 0666, upper);
+  return register_driver(path, &g_rgbledops, 0600, upper);
 }
 
 #endif /* CONFIG_RGBLED */
diff --git a/drivers/leds/userled_upper.c b/drivers/leds/userled_upper.c
index b91d73b4567..44bd6724351 100644
--- a/drivers/leds/userled_upper.c
+++ b/drivers/leds/userled_upper.c
@@ -550,7 +550,7 @@ int userled_register(FAR const char *devname,
 
   /* And register the LED driver */
 
-  ret = register_driver(devname, &g_userled_fops, 0666, priv);
+  ret = register_driver(devname, &g_userled_fops, 0600, priv);
   if (ret < 0)
     {
       lederr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/leds/ws2812.c b/drivers/leds/ws2812.c
index d458f3907b2..43de7121837 100644
--- a/drivers/leds/ws2812.c
+++ b/drivers/leds/ws2812.c
@@ -614,7 +614,7 @@ int ws2812_register(FAR const char          *dev_path,
 {
   /* Register the character driver */
 
-  int ret = register_driver(dev_path, &g_ws2812fops, 0666, dev_data);
+  int ret = register_driver(dev_path, &g_ws2812fops, 0600, dev_data);
   if (ret < 0)
     {
       lederr("ERROR: Failed to register ws2812 driver: %d\n", ret);
@@ -685,7 +685,7 @@ int ws2812_leds_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_ws2812fops, 0666, priv);
+  ret = register_driver(devpath, &g_ws2812fops, 0600, priv);
   if (ret < 0)
     {
       lederr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/loop/loop.c b/drivers/loop/loop.c
index 398d604d15e..e1f00af694f 100644
--- a/drivers/loop/loop.c
+++ b/drivers/loop/loop.c
@@ -168,7 +168,7 @@ static int loop_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 
 void loop_register(void)
 {
-  register_driver("/dev/loop", &g_loop_fops, 0666, NULL);
+  register_driver("/dev/loop", &g_loop_fops, 0600, NULL);
 }
 
 #endif /* CONFIG_DEV_LOOP */
diff --git a/drivers/math/math.c b/drivers/math/math.c
index 2fae9ac7beb..c979abca80a 100644
--- a/drivers/math/math.c
+++ b/drivers/math/math.c
@@ -220,7 +220,7 @@ int math_register(FAR const char *path,
 
   /* Register the math timer device */
 
-  ret = register_driver(path, &g_math_ops, 0666, upper);
+  ret = register_driver(path, &g_math_ops, 0600, upper);
   if (ret < 0)
     {
       _err("register math driver failed: %d\n", ret);
diff --git a/drivers/misc/dev_ascii.c b/drivers/misc/dev_ascii.c
index cd8fbea9554..5f783012fe8 100644
--- a/drivers/misc/dev_ascii.c
+++ b/drivers/misc/dev_ascii.c
@@ -137,5 +137,5 @@ static int devascii_poll(FAR struct file *filep, FAR struct pollfd *fds,
 
 void devascii_register(void)
 {
-  register_driver("/dev/ascii", &g_devascii_fops, 0666, NULL);
+  register_driver("/dev/ascii", &g_devascii_fops, 0644, NULL);
 }
diff --git a/drivers/misc/dev_mem.c b/drivers/misc/dev_mem.c
index 9db2c700d23..36385d9e390 100644
--- a/drivers/misc/dev_mem.c
+++ b/drivers/misc/dev_mem.c
@@ -198,5 +198,5 @@ static int devmem_mmap(FAR struct file *filep,
 int devmem_register(void)
 {
   return register_driver("/dev/mem", &g_devmem_fops,
-                         0666, (FAR void *)g_memory_region);
+                         0600, (FAR void *)g_memory_region);
 }
diff --git a/drivers/misc/lwl_console.c b/drivers/misc/lwl_console.c
index e5d686b767b..fc089fed12b 100644
--- a/drivers/misc/lwl_console.c
+++ b/drivers/misc/lwl_console.c
@@ -316,5 +316,5 @@ void up_putc(int ch)
 
 void lwlconsole_init(void)
 {
-  register_driver("/dev/console", &g_consoleops, 0666, NULL);
+  register_driver("/dev/console", &g_consoleops, 0620, NULL);
 }
diff --git a/drivers/misc/optee.c b/drivers/misc/optee.c
index 0ad33fc65e2..a5cd9b2e6b4 100644
--- a/drivers/misc/optee.c
+++ b/drivers/misc/optee.c
@@ -1501,7 +1501,7 @@ int optee_register(void)
     }
 
 #ifdef CONFIG_DEV_OPTEE_SUPPLICANT
-  ret = register_driver(OPTEE_SUPPLICANT_DEV_PATH, &g_optee_ops, 0666,
+  ret = register_driver(OPTEE_SUPPLICANT_DEV_PATH, &g_optee_ops, 0600,
                         (FAR void *)OPTEE_ROLE_SUPPLICANT);
   if (ret < 0)
     {
@@ -1509,7 +1509,7 @@ int optee_register(void)
     }
 #endif
 
-  return register_driver(OPTEE_DEV_PATH, &g_optee_ops, 0666,
+  return register_driver(OPTEE_DEV_PATH, &g_optee_ops, 0600,
                          (FAR void *)OPTEE_ROLE_CA);
 }
 
diff --git a/drivers/misc/rpmsgblk.c b/drivers/misc/rpmsgblk.c
index 383cdaa483a..a19c1d31513 100644
--- a/drivers/misc/rpmsgblk.c
+++ b/drivers/misc/rpmsgblk.c
@@ -1307,7 +1307,7 @@ int rpmsgblk_register(FAR const char *remotecpu, FAR const char *remotepath,
       localpath = remotepath;
     }
 
-  ret = register_blockdriver(localpath, &dev->blk, 0755, dev);
+  ret = register_blockdriver(localpath, &dev->blk, 0750, dev);
   if (ret < 0)
     {
       ferr("ERROR: register driver failed, ret=%d\n", ret);
diff --git a/drivers/misc/rpmsgdev.c b/drivers/misc/rpmsgdev.c
index 7b7fb7c2426..540ecc07cbd 100644
--- a/drivers/misc/rpmsgdev.c
+++ b/drivers/misc/rpmsgdev.c
@@ -1196,7 +1196,7 @@ int rpmsgdev_register(FAR const char *remotecpu, FAR const char *remotepath,
       localpath = remotepath;
     }
 
-  ret = register_driver(localpath, &g_rpmsgdev_ops, 0666, dev);
+  ret = register_driver(localpath, &g_rpmsgdev_ops, 0600, dev);
   if (ret < 0)
     {
       rpmsgdeverr("register driver failed, ret=%d\n", ret);
diff --git a/drivers/mmcsd/mmcsd_sdio.c b/drivers/mmcsd/mmcsd_sdio.c
index 7eaad68460b..a767dce7fee 100644
--- a/drivers/mmcsd/mmcsd_sdio.c
+++ b/drivers/mmcsd/mmcsd_sdio.c
@@ -4407,7 +4407,7 @@ static int mmcsd_probe(FAR struct mmcsd_state_s *priv)
                 {
                   snprintf(devname, sizeof(devname), "/dev/mmcsd%d%s",
                            priv->minor, g_partname[i]);
-                  register_blockdriver(devname, &g_bops, 0666,
+                  register_blockdriver(devname, &g_bops, 0660,
                                        &priv->part[i]);
                 }
             }
diff --git a/drivers/modem/alt1250/alt1250.c b/drivers/modem/alt1250/alt1250.c
index 497ee0334a8..934ef6f417a 100644
--- a/drivers/modem/alt1250/alt1250.c
+++ b/drivers/modem/alt1250/alt1250.c
@@ -1511,7 +1511,7 @@ FAR void *alt1250_register(FAR const char *devpath,
   nxsem_init(&g_alt1250_res_s.sem, 0, 0);
 #endif
 
-  ret = register_driver(devpath, &g_alt1250fops, 0666, priv);
+  ret = register_driver(devpath, &g_alt1250fops, 0600, priv);
   if (ret < 0)
     {
       m_err("Failed to register driver: %d\n", ret);
diff --git a/drivers/modem/u-blox.c b/drivers/modem/u-blox.c
index 8586d85fb96..3f414e477eb 100644
--- a/drivers/modem/u-blox.c
+++ b/drivers/modem/u-blox.c
@@ -294,7 +294,7 @@ FAR void *ubxmdm_register(FAR const char *path,
       goto errout_with_upper;
     }
 
-  ret = register_driver(path, &g_ubxmdm_fops, 0666, upper);
+  ret = register_driver(path, &g_ubxmdm_fops, 0600, upper);
   if (ret < 0)
     {
       m_err("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/motor/foc/foc_dev.c b/drivers/motor/foc/foc_dev.c
index 1da229b4142..c065e64b286 100644
--- a/drivers/motor/foc/foc_dev.c
+++ b/drivers/motor/foc/foc_dev.c
@@ -915,7 +915,7 @@ int foc_register(FAR const char *path, FAR struct foc_dev_s *dev)
 
   /* Register the FOC character driver */
 
-  ret = register_driver(path, &g_foc_fops, 0666, dev);
+  ret = register_driver(path, &g_foc_fops, 0600, dev);
   if (ret < 0)
     {
       nxmutex_destroy(&dev->closelock);
diff --git a/drivers/motor/motor.c b/drivers/motor/motor.c
index 849d3272648..85cfd9f9bc5 100644
--- a/drivers/motor/motor.c
+++ b/drivers/motor/motor.c
@@ -587,7 +587,7 @@ int motor_register(FAR const char *path,
 
   /* Register the motor character driver */
 
-  ret = register_driver(path, &g_motor_fops, 0666, upper);
+  ret = register_driver(path, &g_motor_fops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->closelock);
diff --git a/drivers/motor/stepper.c b/drivers/motor/stepper.c
index d9f3b8cd8d2..7ed22d5283b 100644
--- a/drivers/motor/stepper.c
+++ b/drivers/motor/stepper.c
@@ -338,7 +338,7 @@ int stepper_register(FAR const char *path,
 
   /* Register the stepper character driver */
 
-  ret = register_driver(path, &g_stepper_fops, 0666, stepper);
+  ret = register_driver(path, &g_stepper_fops, 0600, stepper);
   if (ret < 0)
     {
       nxmutex_destroy(&stepper->lock);
diff --git a/drivers/mtd/dhara.c b/drivers/mtd/dhara.c
index f8cfc926990..837a50e01e1 100644
--- a/drivers/mtd/dhara.c
+++ b/drivers/mtd/dhara.c
@@ -754,7 +754,7 @@ int dhara_initialize_by_path(FAR const char *path,
    * DHARA_MTDBLOCK device structure
    */
 
-  ret = register_blockdriver(path, &g_dhara_bops, 0666, dev);
+  ret = register_blockdriver(path, &g_dhara_bops, 0660, dev);
   if (ret < 0)
     {
       ferr("register_blockdriver failed: %d\n", ret);
diff --git a/drivers/mtd/filemtd.c b/drivers/mtd/filemtd.c
index a3eff6c43e2..1ef36b84d60 100644
--- a/drivers/mtd/filemtd.c
+++ b/drivers/mtd/filemtd.c
@@ -948,6 +948,6 @@ bool filemtd_isfilemtd(FAR struct mtd_dev_s *dev)
 #ifdef CONFIG_MTD_LOOP
 int mtd_loop_register(void)
 {
-  return register_driver("/dev/loopmtd", &g_fops, 0666, NULL);
+  return register_driver("/dev/loopmtd", &g_fops, 0600, NULL);
 }
 #endif
diff --git a/drivers/mtd/mtd_config.c b/drivers/mtd/mtd_config.c
index 9c063737925..560d69eb69d 100644
--- a/drivers/mtd/mtd_config.c
+++ b/drivers/mtd/mtd_config.c
@@ -1784,7 +1784,7 @@ int mtdconfig_register_by_path(FAR struct mtd_dev_s *mtd,
         }
 
       nxmutex_init(&dev->lock);
-      register_driver(path, &g_mtdconfig_fops, 0666, dev);
+      register_driver(path, &g_mtdconfig_fops, 0600, dev);
     }
 
 errout:
diff --git a/drivers/mtd/mtd_config_nvs.c b/drivers/mtd/mtd_config_nvs.c
index 187af6ef92e..5251c276e52 100644
--- a/drivers/mtd/mtd_config_nvs.c
+++ b/drivers/mtd/mtd_config_nvs.c
@@ -2489,7 +2489,7 @@ int mtdconfig_register_by_path(FAR struct mtd_dev_s *mtd,
       goto mutex_err;
     }
 
-  rc = register_driver(path, &g_mtdnvs_fops, 0666, fs);
+  rc = register_driver(path, &g_mtdnvs_fops, 0600, fs);
   if (rc < 0)
     {
       ferr("ERROR: register mtd config failed: %d\n", rc);
diff --git a/drivers/mtd/nvblk.c b/drivers/mtd/nvblk.c
index 5029b61ec40..541cfb0297b 100644
--- a/drivers/mtd/nvblk.c
+++ b/drivers/mtd/nvblk.c
@@ -542,7 +542,7 @@ int nvblk_initialize(FAR const char *path,
    * NVBLK_MTDBLOCK device structure
    */
 
-  ret = register_blockdriver(path, &g_nvblk_bops, 0666, dev);
+  ret = register_blockdriver(path, &g_nvblk_bops, 0660, dev);
   if (ret < 0)
     {
       ferr("register_blockdriver failed: %d\n", ret);
diff --git a/drivers/mtd/smart.c b/drivers/mtd/smart.c
index 30bded0cffa..8d008a6f6bb 100644
--- a/drivers/mtd/smart.c
+++ b/drivers/mtd/smart.c
@@ -6346,7 +6346,7 @@ errout:
 #ifdef CONFIG_SMART_DEV_LOOP
 int smart_loop_register_driver(void)
 {
-  return register_driver("/dev/smart", &g_fops, 0666, NULL);
+  return register_driver("/dev/smart", &g_fops, 0600, NULL);
 }
 #endif
 
diff --git a/drivers/net/telnet.c b/drivers/net/telnet.c
index b81157a9548..b5811d04695 100644
--- a/drivers/net/telnet.c
+++ b/drivers/net/telnet.c
@@ -1023,7 +1023,7 @@ static int telnet_session(FAR struct telnet_session_s *session)
 
   /* Register the driver */
 
-  ret = register_driver(session->ts_devpath, &g_telnet_fops, 0666, priv);
+  ret = register_driver(session->ts_devpath, &g_telnet_fops, 0600, priv);
   if (ret < 0)
     {
       nerr("ERROR: Failed to register the driver %s: %d\n",
@@ -1274,7 +1274,7 @@ static int factory_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 
 int telnet_initialize(void)
 {
-  return register_driver("/dev/telnet", &g_factory_fops, 0666, NULL);
+  return register_driver("/dev/telnet", &g_factory_fops, 0600, NULL);
 }
 
 #endif /* CONFIG_NETDEV_TELNET */
diff --git a/drivers/note/notectl_driver.c b/drivers/note/notectl_driver.c
index 0aaefa8cc6f..9679ff0cc18 100644
--- a/drivers/note/notectl_driver.c
+++ b/drivers/note/notectl_driver.c
@@ -237,5 +237,5 @@ static int notectl_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 
 int notectl_register(void)
 {
-  return register_driver("/dev/notectl", &g_notectl_fops, 0666, NULL);
+  return register_driver("/dev/notectl", &g_notectl_fops, 0600, NULL);
 }
diff --git a/drivers/note/noteram_driver.c b/drivers/note/noteram_driver.c
index ee5b4716320..8025b4a4256 100644
--- a/drivers/note/noteram_driver.c
+++ b/drivers/note/noteram_driver.c
@@ -1359,7 +1359,7 @@ int noteram_register(void)
 #ifdef CONFIG_DRIVERS_NOTERAM_CRASH_DUMP
   noteram_crash_dump_register(&g_noteram_driver);
 #endif
-  return register_driver("/dev/note/ram", &g_noteram_fops, 0666,
+  return register_driver("/dev/note/ram", &g_noteram_fops, 0400,
                          &g_noteram_driver);
 }
 
@@ -1438,7 +1438,7 @@ noteram_initialize(FAR const char *devpath, size_t bufsize,
       return &drv->driver;
     }
 
-  ret = register_driver(devpath, &g_noteram_fops, 0666, drv);
+  ret = register_driver(devpath, &g_noteram_fops, 0400, drv);
   if (ret < 0)
     {
       kmm_free(drv);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index fcb3d87a01a..257e349c638 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2354,7 +2354,7 @@ uint8_t pci_bus_find_capability(FAR struct pci_bus_s *bus,
 
 int pci_dev_register(void)
 {
-  return register_driver("/dev/pci", &g_pci_fops, 0666, NULL);
+  return register_driver("/dev/pci", &g_pci_fops, 0600, NULL);
 }
 
 /****************************************************************************
diff --git a/drivers/pci/pci_ep_test.c b/drivers/pci/pci_ep_test.c
index 5cce715f7cb..6c1cbcf725a 100644
--- a/drivers/pci/pci_ep_test.c
+++ b/drivers/pci/pci_ep_test.c
@@ -827,7 +827,7 @@ static int pci_ep_test_probe(FAR struct pci_device_s *dev)
 
   snprintf(test->name, sizeof(test->name),
            PCI_EP_TEST_DEVICE_NAME ".%d", g_pci_ep_idr++);
-  register_driver(test->name, &g_pci_ep_test_fops, 0666, test);
+  register_driver(test->name, &g_pci_ep_test_fops, 0600, test);
   pciinfo("pci ep test device register success.\n");
 
   return 0;
diff --git a/drivers/pci/pci_uio_ivshmem.c b/drivers/pci/pci_uio_ivshmem.c
index e713df74554..9340dda5180 100644
--- a/drivers/pci/pci_uio_ivshmem.c
+++ b/drivers/pci/pci_uio_ivshmem.c
@@ -483,7 +483,7 @@ static int uio_ivshmem_probe(FAR struct ivshmem_device_s *dev)
   ivshmem_control_irq(dev, true);
 
   snprintf(udev->name, sizeof(udev->name), "/dev/uio%d", udev->drv.id);
-  ret = register_driver(udev->name, &g_uio_ivshmem_fops, 0666, udev);
+  ret = register_driver(udev->name, &g_uio_ivshmem_fops, 0600, udev);
   if (ret < 0)
     {
       pcierr("ERROR: Ivshmem register_driver failed, ret=%d\n", ret);
diff --git a/drivers/pinctrl/pinctrl.c b/drivers/pinctrl/pinctrl.c
index 21fbf6b6a9c..e2be6448d1b 100644
--- a/drivers/pinctrl/pinctrl.c
+++ b/drivers/pinctrl/pinctrl.c
@@ -227,7 +227,7 @@ int pinctrl_register(FAR struct pinctrl_dev_s *dev, int minor)
   char devname[32];
 
   snprintf(devname, 16, "/dev/pinctrl%u", (unsigned int)minor);
-  return register_driver(devname, &g_pinctrl_drvrops, 0666, dev);
+  return register_driver(devname, &g_pinctrl_drvrops, 0600, dev);
 }
 
 /****************************************************************************
diff --git a/drivers/power/battery/battery_charger.c b/drivers/power/battery/battery_charger.c
index 425dc03014e..9bfb9e942d5 100644
--- a/drivers/power/battery/battery_charger.c
+++ b/drivers/power/battery/battery_charger.c
@@ -559,7 +559,7 @@ int battery_charger_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_batteryops, 0666, dev);
+  ret = register_driver(devpath, &g_batteryops, 0600, dev);
   if (ret < 0)
     {
       baterr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/power/battery/battery_gauge.c b/drivers/power/battery/battery_gauge.c
index bfbcbd99df2..86c684e7448 100644
--- a/drivers/power/battery/battery_gauge.c
+++ b/drivers/power/battery/battery_gauge.c
@@ -519,7 +519,7 @@ int battery_gauge_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_batteryops, 0666, dev);
+  ret = register_driver(devpath, &g_batteryops, 0600, dev);
   if (ret < 0)
     {
       baterr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/power/battery/battery_monitor.c b/drivers/power/battery/battery_monitor.c
index 798223dac45..83ca80aa2ed 100644
--- a/drivers/power/battery/battery_monitor.c
+++ b/drivers/power/battery/battery_monitor.c
@@ -585,7 +585,7 @@ int battery_monitor_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_batteryops, 0555, dev);
+  ret = register_driver(devpath, &g_batteryops, 0500, dev);
   if (ret < 0)
     {
       baterr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/power/relay/relay.c b/drivers/power/relay/relay.c
index e2f6909efa5..07ca142f989 100644
--- a/drivers/power/relay/relay.c
+++ b/drivers/power/relay/relay.c
@@ -158,5 +158,5 @@ int relay_register(FAR struct relay_dev_s *dev, FAR const char *devname)
 
   nxmutex_init(&dev->lock);
 
-  return register_driver(devname, &g_relay_ops, 0666, dev);
+  return register_driver(devname, &g_relay_ops, 0600, dev);
 }
diff --git a/drivers/power/supply/powerled.c b/drivers/power/supply/powerled.c
index 6e671b3064a..24ae1f5fa58 100644
--- a/drivers/power/supply/powerled.c
+++ b/drivers/power/supply/powerled.c
@@ -414,7 +414,7 @@ int powerled_register(FAR const char *path, FAR struct powerled_dev_s *dev,
 
   /* Register the POWERLED character driver */
 
-  ret = register_driver(path, &g_powerled_fops, 0666, dev);
+  ret = register_driver(path, &g_powerled_fops, 0600, dev);
   if (ret < 0)
     {
       nxmutex_destroy(&dev->closelock);
diff --git a/drivers/power/supply/smps.c b/drivers/power/supply/smps.c
index f31c6d796af..5d4f8221359 100644
--- a/drivers/power/supply/smps.c
+++ b/drivers/power/supply/smps.c
@@ -511,7 +511,7 @@ int smps_register(FAR const char *path, FAR struct smps_dev_s *dev,
 
   /* Register the SMPS character driver */
 
-  ret = register_driver(path, &g_smps_fops, 0666, dev);
+  ret = register_driver(path, &g_smps_fops, 0600, dev);
   if (ret < 0)
     {
       nxmutex_destroy(&dev->closelock);
diff --git a/drivers/rc/lirc_dev.c b/drivers/rc/lirc_dev.c
index fc605521191..3f5298e0fa0 100644
--- a/drivers/rc/lirc_dev.c
+++ b/drivers/rc/lirc_dev.c
@@ -796,7 +796,7 @@ int lirc_register(FAR struct lirc_lowerhalf_s *lower, int devno)
   /* Register remote control character device */
 
   snprintf(path, DEVNAME_MAX, DEVNAME_FMT, devno);
-  ret = register_driver(path, &g_lirc_fops, 0666, upper);
+  ret = register_driver(path, &g_lirc_fops, 0600, upper);
   if (ret < 0)
     {
       goto drv_err;
diff --git a/drivers/rf/dat-31r5-sp.c b/drivers/rf/dat-31r5-sp.c
index 2dbda8ef7cd..c77c5bee46a 100644
--- a/drivers/rf/dat-31r5-sp.c
+++ b/drivers/rf/dat-31r5-sp.c
@@ -248,7 +248,7 @@ int dat31r5sp_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_dat31r5sp_fops, 0666, priv);
+  ret = register_driver(devpath, &g_dat31r5sp_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/rpmsg/rpmsg.c b/drivers/rpmsg/rpmsg.c
index 73d0f96774c..217925f6a8a 100644
--- a/drivers/rpmsg/rpmsg.c
+++ b/drivers/rpmsg/rpmsg.c
@@ -521,7 +521,7 @@ int rpmsg_register(FAR const char *path, FAR struct rpmsg_s *rpmsg,
       return ret;
     }
 
-  ret = register_driver(path, &g_rpmsg_dev_ops, 0222, rpmsg);
+  ret = register_driver(path, &g_rpmsg_dev_ops, 0200, rpmsg);
   if (ret < 0)
     {
       metal_finish();
diff --git a/drivers/rptun/rptun.c b/drivers/rptun/rptun.c
index 8d04d81c769..58a213f8cd6 100644
--- a/drivers/rptun/rptun.c
+++ b/drivers/rptun/rptun.c
@@ -1226,7 +1226,7 @@ int rptun_initialize(FAR struct rptun_dev_s *dev)
   remoteproc_init(&priv->rproc, &g_rptun_ops, priv);
 
   snprintf(name, sizeof(name), "/dev/rptun/%s", RPTUN_GET_CPUNAME(dev));
-  ret = register_driver(name, &g_rptun_fops, 0222, priv);
+  ret = register_driver(name, &g_rptun_fops, 0200, priv);
   if (ret < 0)
     {
       rptunerr("rptun register driver failed %d\n", ret);
diff --git a/drivers/sensors/adt7320.c b/drivers/sensors/adt7320.c
index 872dd5b6ef2..c7554f1979c 100644
--- a/drivers/sensors/adt7320.c
+++ b/drivers/sensors/adt7320.c
@@ -618,7 +618,7 @@ int adt7320_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_adt7320fops, 0666, priv);
+  ret = register_driver(devpath, &g_adt7320fops, 0440, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/adxl345_base.c b/drivers/sensors/adxl345_base.c
index 0e5a4b7fed1..1c2798de1fa 100644
--- a/drivers/sensors/adxl345_base.c
+++ b/drivers/sensors/adxl345_base.c
@@ -173,7 +173,7 @@ int adxl345_register(ADXL345_HANDLE handle, int minor)
   /* Register the character driver */
 
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
-  ret = register_driver(devname, &g_adxl345fops, 0444, priv);
+  ret = register_driver(devname, &g_adxl345fops, 0440, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver %s: %d\n", devname, ret);
diff --git a/drivers/sensors/adxl372.c b/drivers/sensors/adxl372.c
index debd2654714..5d48c99d3f2 100644
--- a/drivers/sensors/adxl372.c
+++ b/drivers/sensors/adxl372.c
@@ -876,7 +876,7 @@ int adxl372_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_adxl372_fops, 0666, priv);
+  ret = register_driver(devpath, &g_adxl372_fops, 0440, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register accelerometer driver: %d\n", ret);
diff --git a/drivers/sensors/aht10.c b/drivers/sensors/aht10.c
index 253b00d4a13..fe89b92c14b 100644
--- a/drivers/sensors/aht10.c
+++ b/drivers/sensors/aht10.c
@@ -628,7 +628,7 @@ int aht10_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_aht10fops, 0666, priv);
+  ret = register_driver(devpath, &g_aht10fops, 0400, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/ak09912.c b/drivers/sensors/ak09912.c
index 3170b0f6dc2..0ecf040bdc2 100644
--- a/drivers/sensors/ak09912.c
+++ b/drivers/sensors/ak09912.c
@@ -714,7 +714,7 @@ int ak09912_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
   /* Register the character driver */
 
   snprintf(path, sizeof(path), "%s%d", devpath, 0);
-  ret = register_driver(path, &g_ak09912fops, 0666, priv);
+  ret = register_driver(path, &g_ak09912fops, 0640, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/amg88xx.c b/drivers/sensors/amg88xx.c
index 9e7c95159c8..63368677e02 100644
--- a/drivers/sensors/amg88xx.c
+++ b/drivers/sensors/amg88xx.c
@@ -622,7 +622,7 @@ int amg88xx_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_amg88xx_fops, 0666, priv);
+  ret = register_driver(devpath, &g_amg88xx_fops, 0600, priv);
 
   if (ret < 0)
     {
diff --git a/drivers/sensors/apds9922.c b/drivers/sensors/apds9922.c
index 859d11da9e3..12f52cd3e9a 100644
--- a/drivers/sensors/apds9922.c
+++ b/drivers/sensors/apds9922.c
@@ -2506,7 +2506,7 @@ int apds9922_register(FAR const char *devpath_als,
 
   if (devpath_als != NULL)
     {
-      ret = register_driver(devpath_als, &g_apds9922_alsfops, 0666, priv);
+      ret = register_driver(devpath_als, &g_apds9922_alsfops, 0600, priv);
       if (ret < 0)
         {
           snerr("ERROR: Failed to register driver %s: %d\n",
@@ -2518,7 +2518,7 @@ int apds9922_register(FAR const char *devpath_als,
 
   if (devpath_ps != NULL)
     {
-      ret = register_driver(devpath_ps, &g_apds9922_psfops, 0666, priv);
+      ret = register_driver(devpath_ps, &g_apds9922_psfops, 0600, priv);
       if (ret < 0)
         {
           snerr("ERROR: Failed to register driver %s: %d\n",
diff --git a/drivers/sensors/apds9960.c b/drivers/sensors/apds9960.c
index 546ebe7f1b3..b311d1c4d44 100644
--- a/drivers/sensors/apds9960.c
+++ b/drivers/sensors/apds9960.c
@@ -1287,7 +1287,7 @@ int apds9960_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_apds9960_fops, 0666, priv);
+  ret = register_driver(devpath, &g_apds9960_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/as726x.c b/drivers/sensors/as726x.c
index f0f016bdea2..b3629644458 100644
--- a/drivers/sensors/as726x.c
+++ b/drivers/sensors/as726x.c
@@ -476,7 +476,7 @@ int as726x_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_as726x_fops, 0666, priv);
+  ret = register_driver(devpath, &g_as726x_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/bh1749nuc.c b/drivers/sensors/bh1749nuc.c
index 563648e0101..4072d8f7e8a 100644
--- a/drivers/sensors/bh1749nuc.c
+++ b/drivers/sensors/bh1749nuc.c
@@ -231,7 +231,7 @@ int bh1749nuc_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_bh1749nucfops, 0666, priv);
+  ret = register_driver(devpath, &g_bh1749nucfops, 0600, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/bh1750fvi.c b/drivers/sensors/bh1750fvi.c
index 7eae4c7e59c..4deb16455c3 100644
--- a/drivers/sensors/bh1750fvi.c
+++ b/drivers/sensors/bh1750fvi.c
@@ -409,7 +409,7 @@ int bh1750fvi_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_bh1750fvi_fops, 0666, priv);
+  ret = register_driver(devpath, &g_bh1750fvi_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/bmg160.c b/drivers/sensors/bmg160.c
index 8c2368b2905..cb233d1cf27 100644
--- a/drivers/sensors/bmg160.c
+++ b/drivers/sensors/bmg160.c
@@ -559,7 +559,7 @@ int bmg160_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_bmg160_fops, 0666, priv);
+  ret = register_driver(devpath, &g_bmg160_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/bmi088.c b/drivers/sensors/bmi088.c
index 5072a20428d..0da240fb689 100644
--- a/drivers/sensors/bmi088.c
+++ b/drivers/sensors/bmi088.c
@@ -375,7 +375,7 @@ int bmi088_acc_register(FAR const char *devpath, FAR struct spi_dev_s *dev)
       return ret;
     }
 
-  ret = register_driver(devpath, &g_bmi088_acc_fops, 0666, priv);
+  ret = register_driver(devpath, &g_bmi088_acc_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
@@ -437,7 +437,7 @@ int bmi088_gyro_register(FAR const char *devpath, FAR struct spi_dev_s *dev)
       return ret;
     }
 
-  ret = register_driver(devpath, &g_bmi088_gyro_fops, 0666, priv);
+  ret = register_driver(devpath, &g_bmi088_gyro_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/bmi160.c b/drivers/sensors/bmi160.c
index b6bc9a8eb7e..8f5753bf75c 100644
--- a/drivers/sensors/bmi160.c
+++ b/drivers/sensors/bmi160.c
@@ -296,7 +296,7 @@ int bmi160_register(FAR const char *devpath, FAR struct spi_dev_s *dev)
 
   bmi160_putreg8(priv, BMI160_PMU_TRIGGER, 0);
 
-  ret = register_driver(devpath, &g_bmi160fops, 0666, priv);
+  ret = register_driver(devpath, &g_bmi160fops, 0600, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/bmi270.c b/drivers/sensors/bmi270.c
index 8081ee1badc..ab2b93255c4 100644
--- a/drivers/sensors/bmi270.c
+++ b/drivers/sensors/bmi270.c
@@ -234,7 +234,7 @@ int bmi270_register(FAR const char *devpath, FAR struct spi_dev_s *dev)
 
   /* Register driver */
 
-  ret = register_driver(devpath, &g_bmi270fops, 0666, priv);
+  ret = register_driver(devpath, &g_bmi270fops, 0600, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/bmp180.c b/drivers/sensors/bmp180.c
index 736c5b7ddd2..368259ac17d 100644
--- a/drivers/sensors/bmp180.c
+++ b/drivers/sensors/bmp180.c
@@ -167,7 +167,7 @@ int bmp180_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_bmp180fops, 0666, priv);
+  ret = register_driver(devpath, &g_bmp180fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/cxd5602pwbimu.c b/drivers/sensors/cxd5602pwbimu.c
index e42fe415bec..1de3543b1b4 100644
--- a/drivers/sensors/cxd5602pwbimu.c
+++ b/drivers/sensors/cxd5602pwbimu.c
@@ -1813,7 +1813,7 @@ int cxd5602pwbimu_register(FAR const char *devpath,
   nxsem_init(&priv->dataready, 0, 0);
   nxsem_init(&priv->bufsem, 0, 1);
 
-  ret = register_driver(devpath, &g_cxd5602pwbimufops, 0666, priv);
+  ret = register_driver(devpath, &g_cxd5602pwbimufops, 0600, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/dhtxx.c b/drivers/sensors/dhtxx.c
index d881f47520b..c01fddfaba9 100644
--- a/drivers/sensors/dhtxx.c
+++ b/drivers/sensors/dhtxx.c
@@ -574,7 +574,7 @@ int dhtxx_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_dhtxxfops, 0666, priv);
+  ret = register_driver(devpath, &g_dhtxxfops, 0600, priv);
   if (ret < 0)
     {
       nxmutex_destroy(&priv->devlock);
diff --git a/drivers/sensors/fxos8700cq.c b/drivers/sensors/fxos8700cq.c
index 18e3b8a210b..fedf21a8a1d 100644
--- a/drivers/sensors/fxos8700cq.c
+++ b/drivers/sensors/fxos8700cq.c
@@ -450,7 +450,7 @@ int fxos8700cq_register(FAR const char *devpath,
       return ret;
     }
 
-  ret = register_driver(devpath, &g_fxos8700cqfops, 0444, priv);
+  ret = register_driver(devpath, &g_fxos8700cqfops, 0400, priv);
   if (ret < 0)
     {
       snerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/gnss_uorb.c b/drivers/sensors/gnss_uorb.c
index d94b389e11b..4070624e364 100644
--- a/drivers/sensors/gnss_uorb.c
+++ b/drivers/sensors/gnss_uorb.c
@@ -862,7 +862,7 @@ int gnss_register(FAR struct gnss_lowerhalf_s *lower, int devno,
     }
 
   snprintf(path, PATH_MAX, GNSS_PATH_FMT, devno);
-  ret = register_driver(path, &g_gnss_fops, 0666, upper);
+  ret = register_driver(path, &g_gnss_fops, 0600, upper);
   if (ret < 0)
     {
       goto driver_err;
diff --git a/drivers/sensors/hall3ph.c b/drivers/sensors/hall3ph.c
index 010232f9160..957212b7c02 100644
--- a/drivers/sensors/hall3ph.c
+++ b/drivers/sensors/hall3ph.c
@@ -353,5 +353,5 @@ int hall3_register(FAR const char *devpath,
   /* Register the Hall effect sensor device */
 
   sninfo("Registering %s\n", devpath);
-  return register_driver(devpath, &g_hall3ops, 0666, upper);
+  return register_driver(devpath, &g_hall3ops, 0600, upper);
 }
diff --git a/drivers/sensors/hc_sr04.c b/drivers/sensors/hc_sr04.c
index 06f232052c2..7715e91006d 100644
--- a/drivers/sensors/hc_sr04.c
+++ b/drivers/sensors/hc_sr04.c
@@ -433,7 +433,7 @@ int hcsr04_register(FAR const char *devpath,
   nxmutex_init(&priv->devlock);
   nxsem_init(&priv->conv_donesem, 0, 0);
 
-  ret = register_driver(devpath, &g_hcsr04ops, 0666, priv);
+  ret = register_driver(devpath, &g_hcsr04ops, 0600, priv);
   if (ret < 0)
     {
       nxmutex_destroy(&priv->devlock);
diff --git a/drivers/sensors/hdc1008.c b/drivers/sensors/hdc1008.c
index dc8e05347ab..ce118c80f06 100644
--- a/drivers/sensors/hdc1008.c
+++ b/drivers/sensors/hdc1008.c
@@ -972,7 +972,7 @@ int hdc1008_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the driver */
 
-  ret = register_driver(devpath, &g_hdc1008fops, 0666, priv);
+  ret = register_driver(devpath, &g_hdc1008fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/hts221.c b/drivers/sensors/hts221.c
index 7bb10405a75..9d53e270003 100644
--- a/drivers/sensors/hts221.c
+++ b/drivers/sensors/hts221.c
@@ -1192,7 +1192,7 @@ int hts221_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
       return ret;
     }
 
-  ret = register_driver(devpath, &g_humidityops, 0666, priv);
+  ret = register_driver(devpath, &g_humidityops, 0600, priv);
 
   hts221_dbg("Registered with %d\n", ret);
 
diff --git a/drivers/sensors/ina219.c b/drivers/sensors/ina219.c
index 35efbd26369..5a504bc9bd5 100644
--- a/drivers/sensors/ina219.c
+++ b/drivers/sensors/ina219.c
@@ -402,7 +402,7 @@ int ina219_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_ina219fops, 0666, priv);
+  ret = register_driver(devpath, &g_ina219fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/ina226.c b/drivers/sensors/ina226.c
index 5f8fccf9c66..70e3a0d62b9 100644
--- a/drivers/sensors/ina226.c
+++ b/drivers/sensors/ina226.c
@@ -382,7 +382,7 @@ int ina226_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_ina226fops, 0666, priv);
+  ret = register_driver(devpath, &g_ina226fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/isl29023.c b/drivers/sensors/isl29023.c
index 403832f3c96..12b10d82212 100644
--- a/drivers/sensors/isl29023.c
+++ b/drivers/sensors/isl29023.c
@@ -465,7 +465,7 @@ int isl29023_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_isl29023fops, 0666, priv);
+  ret = register_driver(devpath, &g_isl29023fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/kxtj9.c b/drivers/sensors/kxtj9.c
index c95fbb7fb99..84477a47fb0 100644
--- a/drivers/sensors/kxtj9.c
+++ b/drivers/sensors/kxtj9.c
@@ -635,7 +635,7 @@ int kxtj9_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fops, 0666, priv);
+  ret = register_driver(devpath, &g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lis2dh.c b/drivers/sensors/lis2dh.c
index 73c81ce5d23..57e0a52df94 100644
--- a/drivers/sensors/lis2dh.c
+++ b/drivers/sensors/lis2dh.c
@@ -2041,7 +2041,7 @@ int lis2dh_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
   priv->addr = addr;
   priv->config = config;
 
-  ret = register_driver(devpath, &g_lis2dhops, 0666, priv);
+  ret = register_driver(devpath, &g_lis2dhops, 0600, priv);
   if (ret < 0)
     {
       lis2dh_dbg("lis2dh: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lis3dh.c b/drivers/sensors/lis3dh.c
index 99a25db03d0..e359d52cc73 100644
--- a/drivers/sensors/lis3dh.c
+++ b/drivers/sensors/lis3dh.c
@@ -990,7 +990,7 @@ int lis3dh_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_lis3dh_fops, 0666, priv);
+  ret = register_driver(devpath, &g_lis3dh_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lis3dsh.c b/drivers/sensors/lis3dsh.c
index 01c93659615..c8bd2cbc0e6 100644
--- a/drivers/sensors/lis3dsh.c
+++ b/drivers/sensors/lis3dsh.c
@@ -558,7 +558,7 @@ int lis3dsh_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_lis3dsh_fops, 0666, priv);
+  ret = register_driver(devpath, &g_lis3dsh_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lis3mdl.c b/drivers/sensors/lis3mdl.c
index 0da85b31ebc..f5f5a7a8a8c 100644
--- a/drivers/sensors/lis3mdl.c
+++ b/drivers/sensors/lis3mdl.c
@@ -615,7 +615,7 @@ int lis3mdl_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_lis3mdl_fops, 0666, priv);
+  ret = register_driver(devpath, &g_lis3mdl_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lm75.c b/drivers/sensors/lm75.c
index cab993046ba..6cea7ac911b 100644
--- a/drivers/sensors/lm75.c
+++ b/drivers/sensors/lm75.c
@@ -571,7 +571,7 @@ int lm75_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_lm75fops, 0666, priv);
+  ret = register_driver(devpath, &g_lm75fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lm92.c b/drivers/sensors/lm92.c
index 9ea2e36823e..b8502dcd25d 100644
--- a/drivers/sensors/lm92.c
+++ b/drivers/sensors/lm92.c
@@ -652,7 +652,7 @@ int lm92_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_lm92fops, 0666, priv);
+  ret = register_driver(devpath, &g_lm92fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lps25h.c b/drivers/sensors/lps25h.c
index 1152e29a8c3..2110e9b535e 100644
--- a/drivers/sensors/lps25h.c
+++ b/drivers/sensors/lps25h.c
@@ -769,7 +769,7 @@ int lps25h_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
       dev->config->irq_clear(dev->config);
     }
 
-  ret = register_driver(devpath, &g_lps25hops, 0666, dev);
+  ret = register_driver(devpath, &g_lps25hops, 0600, dev);
 
   lps25h_dbg("Registered with %d\n", ret);
 
diff --git a/drivers/sensors/lsm303agr.c b/drivers/sensors/lsm303agr.c
index 33895b873b5..aae5490715a 100644
--- a/drivers/sensors/lsm303agr.c
+++ b/drivers/sensors/lsm303agr.c
@@ -1194,7 +1194,7 @@ static int lsm303agr_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fops, 0666, priv);
+  ret = register_driver(devpath, &g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lsm330_spi.c b/drivers/sensors/lsm330_spi.c
index 3cb79d7cece..2b3edb5687c 100644
--- a/drivers/sensors/lsm330_spi.c
+++ b/drivers/sensors/lsm330_spi.c
@@ -1357,7 +1357,7 @@ int lsm330_register(FAR const char *devpath_acl,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath_acl, &g_lsm330a_fops, 0666, priv);
+  ret = register_driver(devpath_acl, &g_lsm330a_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register accelerometer driver: %d\n", ret);
@@ -1396,7 +1396,7 @@ int lsm330_register(FAR const char *devpath_acl,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath_gyro, &g_lsm330g_fops, 0666, priv);
+  ret = register_driver(devpath_gyro, &g_lsm330g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register gyroscope driver: %d\n", ret);
diff --git a/drivers/sensors/lsm6dsl.c b/drivers/sensors/lsm6dsl.c
index a372cef2c73..5868c576aed 100644
--- a/drivers/sensors/lsm6dsl.c
+++ b/drivers/sensors/lsm6dsl.c
@@ -1210,7 +1210,7 @@ static int lsm6dsl_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fops, 0666, priv);
+  ret = register_driver(devpath, &g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/lsm9ds1.c b/drivers/sensors/lsm9ds1.c
index f40a574991f..50be815e3e2 100644
--- a/drivers/sensors/lsm9ds1.c
+++ b/drivers/sensors/lsm9ds1.c
@@ -342,7 +342,7 @@ static int lsm9ds1_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fops, 0666, priv);
+  ret = register_driver(devpath, &g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/ltc4151.c b/drivers/sensors/ltc4151.c
index 4c251d3c839..011572c8283 100644
--- a/drivers/sensors/ltc4151.c
+++ b/drivers/sensors/ltc4151.c
@@ -312,7 +312,7 @@ int ltc4151_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_ltc4151fops, 0666, priv);
+  ret = register_driver(devpath, &g_ltc4151fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/max31855.c b/drivers/sensors/max31855.c
index b36449f90bb..7845b40f8f8 100644
--- a/drivers/sensors/max31855.c
+++ b/drivers/sensors/max31855.c
@@ -307,7 +307,7 @@ int max31855_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_max31855fops, 0666, priv);
+  ret = register_driver(devpath, &g_max31855fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/max31865.c b/drivers/sensors/max31865.c
index 25f97de5a40..74fc42468e4 100644
--- a/drivers/sensors/max31865.c
+++ b/drivers/sensors/max31865.c
@@ -337,7 +337,7 @@ int max31865_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_max31865fops, 0666, priv);
+  ret = register_driver(devpath, &g_max31865fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/max44009.c b/drivers/sensors/max44009.c
index 6b99b47850b..529841c6529 100644
--- a/drivers/sensors/max44009.c
+++ b/drivers/sensors/max44009.c
@@ -899,7 +899,7 @@ int max44009_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
   priv->config = config;
   nxmutex_init(&priv->dev_lock);
 
-  ret = register_driver(devpath, &g_alsops, 0666, priv);
+  ret = register_driver(devpath, &g_alsops, 0600, priv);
   max44009_dbg("Registered with %d\n", ret);
   if (ret < 0)
     {
diff --git a/drivers/sensors/max6675.c b/drivers/sensors/max6675.c
index 33941da985b..ebe9cfd9ac9 100644
--- a/drivers/sensors/max6675.c
+++ b/drivers/sensors/max6675.c
@@ -272,7 +272,7 @@ int max6675_register(FAR const char *devpath, FAR struct spi_dev_s *spi)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_max6675fops, 0666, priv);
+  ret = register_driver(devpath, &g_max6675fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/mb7040.c b/drivers/sensors/mb7040.c
index e41c1105892..b6ea7ca6f47 100644
--- a/drivers/sensors/mb7040.c
+++ b/drivers/sensors/mb7040.c
@@ -352,7 +352,7 @@ int mb7040_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fops, 0666, priv);
+  ret = register_driver(devpath, &g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/mcp9844.c b/drivers/sensors/mcp9844.c
index e7d5295823b..e2409a006c5 100644
--- a/drivers/sensors/mcp9844.c
+++ b/drivers/sensors/mcp9844.c
@@ -382,7 +382,7 @@ int mcp9844_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  int ret = register_driver(devpath, &g_mcp9844_fops, 0666, priv);
+  int ret = register_driver(devpath, &g_mcp9844_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/mlx90393.c b/drivers/sensors/mlx90393.c
index 04b28970eb1..8af87e3d870 100644
--- a/drivers/sensors/mlx90393.c
+++ b/drivers/sensors/mlx90393.c
@@ -593,7 +593,7 @@ int mlx90393_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_mlx90393_fops, 0666, priv);
+  ret = register_driver(devpath, &g_mlx90393_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/mlx90614.c b/drivers/sensors/mlx90614.c
index 6068f8c8adc..36dd6c733b2 100644
--- a/drivers/sensors/mlx90614.c
+++ b/drivers/sensors/mlx90614.c
@@ -427,7 +427,7 @@ int mlx90614_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_mlx90614_fops, 0666, priv);
+  ret = register_driver(devpath, &g_mlx90614_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/mpl115a.c b/drivers/sensors/mpl115a.c
index 24cf7fa023c..aa206e80cf1 100644
--- a/drivers/sensors/mpl115a.c
+++ b/drivers/sensors/mpl115a.c
@@ -392,7 +392,7 @@ int mpl115a_register(FAR const char *devpath, FAR struct spi_dev_s *spi)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_mpl115afops, 0666, priv);
+  ret = register_driver(devpath, &g_mpl115afops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/mpu60x0.c b/drivers/sensors/mpu60x0.c
index 3e51f1fb15c..20085090339 100644
--- a/drivers/sensors/mpu60x0.c
+++ b/drivers/sensors/mpu60x0.c
@@ -1187,7 +1187,7 @@ int mpu60x0_register(FAR const char *path, FAR struct mpu_config_s *config)
 
   /* Register the device node. */
 
-  ret = register_driver(path, &g_mpu_fops, 0666, priv);
+  ret = register_driver(path, &g_mpu_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register mpu60x0 interface: %d\n", ret);
diff --git a/drivers/sensors/ms58xx.c b/drivers/sensors/ms58xx.c
index 16a2c722c08..a3621d25dbe 100644
--- a/drivers/sensors/ms58xx.c
+++ b/drivers/sensors/ms58xx.c
@@ -1106,7 +1106,7 @@ int ms58xx_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fops, 0666, priv);
+  ret = register_driver(devpath, &g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/msa301.c b/drivers/sensors/msa301.c
index 1ba82ec266a..1b2e9cb6f51 100644
--- a/drivers/sensors/msa301.c
+++ b/drivers/sensors/msa301.c
@@ -702,7 +702,7 @@ static int msa301_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fops, 0666, priv);
+  ret = register_driver(devpath, &g_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/qencoder.c b/drivers/sensors/qencoder.c
index e02757d8724..558ac1486bb 100644
--- a/drivers/sensors/qencoder.c
+++ b/drivers/sensors/qencoder.c
@@ -407,7 +407,7 @@ int qe_register(FAR const char *devpath, FAR struct qe_lowerhalf_s *lower)
   /* Register the QEncoder device */
 
   sninfo("Registering %s\n", devpath);
-  return register_driver(devpath, &g_qeops, 0666, upper);
+  return register_driver(devpath, &g_qeops, 0600, upper);
 }
 
 #endif /* CONFIG_SENSORS_QENCODER */
diff --git a/drivers/sensors/scd30.c b/drivers/sensors/scd30.c
index 2372b8e3084..48bc40d06d3 100644
--- a/drivers/sensors/scd30.c
+++ b/drivers/sensors/scd30.c
@@ -1075,7 +1075,7 @@ int scd30_register_i2c(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_scd30fops, 0666, priv);
+  ret = register_driver(devpath, &g_scd30fops, 0600, priv);
   if (ret < 0)
     {
       scd30_dbg("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/scd41.c b/drivers/sensors/scd41.c
index e0912744602..b540d25d54d 100644
--- a/drivers/sensors/scd41.c
+++ b/drivers/sensors/scd41.c
@@ -1028,7 +1028,7 @@ int scd41_register_i2c(FAR const char *devpath, FAR struct i2c_master_s *i2c)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_scd41fops, 0666, priv);
+  ret = register_driver(devpath, &g_scd41fops, 0600, priv);
   if (ret < 0)
     {
       scd41_dbg("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/sensor.c b/drivers/sensors/sensor.c
index 323cd8181db..cb88cb33e17 100644
--- a/drivers/sensors/sensor.c
+++ b/drivers/sensors/sensor.c
@@ -1497,7 +1497,7 @@ int sensor_custom_register(FAR struct sensor_lowerhalf_s *lower,
   upper->state.nbuffer = lower->nbuffer;
   upper->lower = lower;
   sminfo(upper->name, "Registering %s", path);
-  ret = register_driver(path, &g_sensor_fops, 0666, upper);
+  ret = register_driver(path, &g_sensor_fops, 0600, upper);
   if (ret)
     {
       goto drv_err;
diff --git a/drivers/sensors/sgp30.c b/drivers/sensors/sgp30.c
index d86565d48cf..be27fccfe69 100644
--- a/drivers/sensors/sgp30.c
+++ b/drivers/sensors/sgp30.c
@@ -1080,7 +1080,7 @@ int sgp30_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_sgp30fops, 0666, priv);
+  ret = register_driver(devpath, &g_sgp30fops, 0600, priv);
   if (ret < 0)
     {
       sgp30_dbg("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/sht21.c b/drivers/sensors/sht21.c
index 1a9b7f0d9a0..a12c6534710 100644
--- a/drivers/sensors/sht21.c
+++ b/drivers/sensors/sht21.c
@@ -681,7 +681,7 @@ int sht21_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_sht21fops, 0666, priv);
+  ret = register_driver(devpath, &g_sht21fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/sht3x.c b/drivers/sensors/sht3x.c
index b284c2cf6c8..19a3ddce050 100644
--- a/drivers/sensors/sht3x.c
+++ b/drivers/sensors/sht3x.c
@@ -698,7 +698,7 @@ int sht3x_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_sht3xfops, 0666, priv);
+  ret = register_driver(devpath, &g_sht3xfops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/sps30.c b/drivers/sensors/sps30.c
index 883531b4677..514fc00f4b9 100644
--- a/drivers/sensors/sps30.c
+++ b/drivers/sensors/sps30.c
@@ -1089,7 +1089,7 @@ int sps30_register_i2c(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_sps30fops, 0666, priv);
+  ret = register_driver(devpath, &g_sps30fops, 0600, priv);
   if (ret < 0)
     {
       sps30_dbg("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/t67xx.c b/drivers/sensors/t67xx.c
index f74308e24f7..4a2f304bdfd 100644
--- a/drivers/sensors/t67xx.c
+++ b/drivers/sensors/t67xx.c
@@ -739,7 +739,7 @@ int t67xx_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver. */
 
-  ret = register_driver(devpath, &g_t67xxfops, 0666, priv);
+  ret = register_driver(devpath, &g_t67xxfops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/tmp112.c b/drivers/sensors/tmp112.c
index d6f8f4ea0a8..9774298a539 100644
--- a/drivers/sensors/tmp112.c
+++ b/drivers/sensors/tmp112.c
@@ -305,7 +305,7 @@ int tmp112_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_tmp112fops, 0666, priv);
+  ret = register_driver(devpath, &g_tmp112fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/usensor.c b/drivers/sensors/usensor.c
index 4a97149a103..2921206e3fa 100644
--- a/drivers/sensors/usensor.c
+++ b/drivers/sensors/usensor.c
@@ -266,7 +266,7 @@ int usensor_initialize(void)
   nxmutex_init(&usensor->lock);
   list_initialize(&usensor->list);
 
-  ret = register_driver(USENSOR_PATH, &g_usensor_fops, 0666, usensor);
+  ret = register_driver(USENSOR_PATH, &g_usensor_fops, 0600, usensor);
   if (ret < 0)
     {
       goto errout_with_lock;
diff --git a/drivers/sensors/veml6070.c b/drivers/sensors/veml6070.c
index 23af2d38b5f..b45c4f8a5af 100644
--- a/drivers/sensors/veml6070.c
+++ b/drivers/sensors/veml6070.c
@@ -302,7 +302,7 @@ int veml6070_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_veml6070_fops, 0666, priv);
+  ret = register_driver(devpath, &g_veml6070_fops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/vl53l1x.c b/drivers/sensors/vl53l1x.c
index da196e07853..555afadaf31 100644
--- a/drivers/sensors/vl53l1x.c
+++ b/drivers/sensors/vl53l1x.c
@@ -1156,7 +1156,7 @@ int vl53l1x_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
       return 0;
     }
 
-  register_driver(devpath, &g_vl53l1xfops, 0666, priv);
+  register_driver(devpath, &g_vl53l1xfops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/sensors/xen1210.c b/drivers/sensors/xen1210.c
index 6a8822acfd4..cd44134b22c 100644
--- a/drivers/sensors/xen1210.c
+++ b/drivers/sensors/xen1210.c
@@ -349,7 +349,7 @@ int xen1210_register(XEN1210_HANDLE handle, int minor)
   /* Register the character driver */
 
   snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
-  ret = register_driver(devname, &g_xen1210fops, 0444, priv);
+  ret = register_driver(devname, &g_xen1210fops, 0400, priv);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver %s: %d\n", devname, ret);
diff --git a/drivers/sensors/zerocross.c b/drivers/sensors/zerocross.c
index 1d0b3db4667..d26a7292fb9 100644
--- a/drivers/sensors/zerocross.c
+++ b/drivers/sensors/zerocross.c
@@ -507,7 +507,7 @@ int zc_register(FAR const char *devname, FAR struct zc_lowerhalf_s *lower)
 
   /* And register the zero cross driver */
 
-  ret = register_driver(devname, &g_zcops, 0666, priv);
+  ret = register_driver(devname, &g_zcops, 0600, priv);
   if (ret < 0)
     {
       snerr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/serial/ptmx.c b/drivers/serial/ptmx.c
index ed699dc85df..9161657aad2 100644
--- a/drivers/serial/ptmx.c
+++ b/drivers/serial/ptmx.c
@@ -267,7 +267,7 @@ int ptmx_register(void)
 {
   /* Register the PTMX driver */
 
-  return register_driver("/dev/ptmx", &g_ptmx_fops, 0666, NULL);
+  return register_driver("/dev/ptmx", &g_ptmx_fops, 0600, NULL);
 }
 
 /****************************************************************************
diff --git a/drivers/serial/pty.c b/drivers/serial/pty.c
index 070e82980fb..59bb59b6c70 100644
--- a/drivers/serial/pty.c
+++ b/drivers/serial/pty.c
@@ -1120,7 +1120,7 @@ int pty_register2(int minor, bool susv1)
 
   snprintf(devname, sizeof(devname), "/dev/pty%d", minor);
 
-  ret = register_driver(devname, &g_pty_fops, 0666, &devpair->pp_master);
+  ret = register_driver(devname, &g_pty_fops, 0600, &devpair->pp_master);
   if (ret < 0)
     {
       goto errout_with_devpair;
@@ -1143,7 +1143,7 @@ int pty_register2(int minor, bool susv1)
       snprintf(devname, sizeof(devname), "/dev/ttyp%d", minor);
     }
 
-  ret = register_driver(devname, &g_pty_fops, 0666, &devpair->pp_slave);
+  ret = register_driver(devname, &g_pty_fops, 0600, &devpair->pp_slave);
   if (ret < 0)
     {
       goto errout_with_master;
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index da80d2e9e66..9f538edf338 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -2181,7 +2181,7 @@ int uart_register(FAR const char *path, FAR uart_dev_t *dev)
 #endif
 
   sinfo("Registering %s\n", path);
-  return register_driver(path, &g_serialops, 0666, dev);
+  return register_driver(path, &g_serialops, 0600, dev);
 }
 
 /****************************************************************************
diff --git a/drivers/serial/uart_bth4.c b/drivers/serial/uart_bth4.c
index 5a2f00ee2cf..773a0195f3b 100644
--- a/drivers/serial/uart_bth4.c
+++ b/drivers/serial/uart_bth4.c
@@ -475,7 +475,7 @@ int uart_bth4_register(FAR const char *path, FAR struct bt_driver_s *drv)
   nxmutex_init(&dev->openlock);
   nxsem_init(&dev->recvsem, 0, 0);
 
-  ret = register_driver(path, &g_uart_bth4_ops, 0666, dev);
+  ret = register_driver(path, &g_uart_bth4_ops, 0600, dev);
   if (ret < 0)
     {
       nxmutex_destroy(&dev->sendlock);
diff --git a/drivers/spi/ice40.c b/drivers/spi/ice40.c
index 3c69d03e546..8cbfeb5641e 100644
--- a/drivers/spi/ice40.c
+++ b/drivers/spi/ice40.c
@@ -405,7 +405,7 @@ int ice40_register(FAR const char *path, FAR struct ice40_dev_s *dev)
 
   /* Register the character driver */
 
-  ret = register_driver(path, &g_ice40_fops, 0666, dev);
+  ret = register_driver(path, &g_ice40_fops, 0600, dev);
   if (ret < 0)
     {
       snerr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/spi/spi_driver.c b/drivers/spi/spi_driver.c
index f74f59b04bc..64a903f131a 100644
--- a/drivers/spi/spi_driver.c
+++ b/drivers/spi/spi_driver.c
@@ -374,7 +374,7 @@ int spi_register(FAR struct spi_dev_s *spi, int bus)
       /* Create the character device name */
 
       snprintf(devname, sizeof(devname), DEVNAME_FMT, bus);
-      ret = register_driver(devname, &g_spidrvr_fops, 0666, priv);
+      ret = register_driver(devname, &g_spidrvr_fops, 0600, priv);
       if (ret < 0)
         {
           /* Free the device structure if we failed to create the character
diff --git a/drivers/spi/spi_slave_driver.c b/drivers/spi/spi_slave_driver.c
index 5bab922ee24..6e040f4ed18 100644
--- a/drivers/spi/spi_slave_driver.c
+++ b/drivers/spi/spi_slave_driver.c
@@ -814,7 +814,7 @@ int spi_slave_register(FAR struct spi_slave_ctrlr_s *ctrlr, int bus)
 
   /* Register the character driver */
 
-  ret = register_driver(devname, &g_spislavefops, 0666, priv);
+  ret = register_driver(devname, &g_spislavefops, 0600, priv);
   if (ret < 0)
     {
       spierr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/syslog/ramlog.c b/drivers/syslog/ramlog.c
index 7e16c09f145..0e2ac3401b3 100644
--- a/drivers/syslog/ramlog.c
+++ b/drivers/syslog/ramlog.c
@@ -786,7 +786,7 @@ int ramlog_register(FAR const char *devpath, FAR char *buffer, size_t buflen)
 
       /* Register the character driver */
 
-      ret = register_driver(devpath, &g_ramlogfops, 0666, priv);
+      ret = register_driver(devpath, &g_ramlogfops, 0600, priv);
       if (ret < 0)
         {
           kmm_free(priv);
@@ -810,7 +810,7 @@ void ramlog_syslog_register(void)
 {
   /* Register the syslog character driver */
 
-  register_driver(CONFIG_SYSLOG_DEVPATH, &g_ramlogfops, 0666, &g_sysdev);
+  register_driver(CONFIG_SYSLOG_DEVPATH, &g_ramlogfops, 0600, &g_sysdev);
 }
 #endif
 
diff --git a/drivers/syslog/syslog_chardev.c b/drivers/syslog/syslog_chardev.c
index 2b7d7f4dc56..e40e162c410 100644
--- a/drivers/syslog/syslog_chardev.c
+++ b/drivers/syslog/syslog_chardev.c
@@ -161,7 +161,7 @@ static int syslog_chardev_ioctl(FAR struct file *filep,
 
 void syslog_register(void)
 {
-  register_driver("/dev/log", &g_syslog_fops, 0222, NULL);
+  register_driver("/dev/log", &g_syslog_fops, 0220, NULL);
 }
 
 #endif /* CONFIG_SYSLOG_CHARDEV */
diff --git a/drivers/syslog/syslog_console.c b/drivers/syslog/syslog_console.c
index 3ae141813a7..b871808e2b8 100644
--- a/drivers/syslog/syslog_console.c
+++ b/drivers/syslog/syslog_console.c
@@ -91,5 +91,5 @@ static ssize_t syslog_console_write(FAR struct file *filep,
 
 void syslog_console_init(void)
 {
-  register_driver("/dev/console", &g_consoleops, 0666, NULL);
+  register_driver("/dev/console", &g_consoleops, 0600, NULL);
 }
diff --git a/drivers/syslog/syslog_rpmsg.c b/drivers/syslog/syslog_rpmsg.c
index d0cd320a1ae..8a68985bf50 100644
--- a/drivers/syslog/syslog_rpmsg.c
+++ b/drivers/syslog/syslog_rpmsg.c
@@ -488,7 +488,7 @@ int syslog_rpmsg_init(void)
   int ret;
 
   ret = register_driver(CONFIG_SYSLOG_DEVPATH, &g_syslog_rpmsgfops,
-                        0666, &g_syslog_rpmsg);
+                        0600, &g_syslog_rpmsg);
   if (ret < 0)
     {
       return ret;
diff --git a/drivers/syslog/syslog_rpmsg_server.c b/drivers/syslog/syslog_rpmsg_server.c
index 404ba5caf93..9143bd51f05 100644
--- a/drivers/syslog/syslog_rpmsg_server.c
+++ b/drivers/syslog/syslog_rpmsg_server.c
@@ -299,7 +299,7 @@ int syslog_rpmsg_server_init(void)
 #ifdef CONFIG_SYSLOG_RPMSG_SERVER_CHARDEV
   int ret;
 
-  ret = register_driver("/dev/logrpmsg", &g_syslog_rpmsg_fops, 0666, NULL);
+  ret = register_driver("/dev/logrpmsg", &g_syslog_rpmsg_fops, 0600, NULL);
   if (ret < 0)
     {
       return ret;
diff --git a/drivers/timers/capture.c b/drivers/timers/capture.c
index 3570fdb1af3..d632f788114 100644
--- a/drivers/timers/capture.c
+++ b/drivers/timers/capture.c
@@ -581,7 +581,7 @@ int cap_register(FAR const char *devpath, FAR struct cap_lowerhalf_s *lower)
 
   /* Register the PWM Capture device */
 
-  return register_driver(devpath, &g_capops, 0666, upper);
+  return register_driver(devpath, &g_capops, 0600, upper);
 }
 
 int cap_register_multiple(FAR const char *devpath,
diff --git a/drivers/timers/dshot.c b/drivers/timers/dshot.c
index 37f4c875339..05bd14922e8 100644
--- a/drivers/timers/dshot.c
+++ b/drivers/timers/dshot.c
@@ -624,7 +624,7 @@ int dshot_register(FAR const char *path, FAR struct dshot_lowerhalf_s *dev)
   nxmutex_init(&upper->lock);
   upper->dev = dev;
 
-  ret = register_driver(path, &g_dshotops, 0666, upper);
+  ret = register_driver(path, &g_dshotops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->lock);
diff --git a/drivers/timers/oneshot.c b/drivers/timers/oneshot.c
index bffcc3116ad..1fcd1dfa572 100644
--- a/drivers/timers/oneshot.c
+++ b/drivers/timers/oneshot.c
@@ -328,7 +328,7 @@ int oneshot_register(FAR const char *devname,
 
   /* And register the oneshot timer driver */
 
-  ret = register_driver(devname, &g_oneshot_ops, 0666, priv);
+  ret = register_driver(devname, &g_oneshot_ops, 0600, priv);
   if (ret < 0)
     {
       tmrerr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/timers/ptp_clock.c b/drivers/timers/ptp_clock.c
index 4b3c92d91ee..39400586f3c 100644
--- a/drivers/timers/ptp_clock.c
+++ b/drivers/timers/ptp_clock.c
@@ -443,7 +443,7 @@ int ptp_clock_register(FAR struct ptp_lowerhalf_s *lower, int32_t max_adj,
 
   snprintf(path, sizeof(path), "/dev/ptp%d", devno);
   ptpinfo("Registering %s\n", path);
-  ret = register_driver(path, &g_ptp_clock_file_ops, 0666, upper);
+  ret = register_driver(path, &g_ptp_clock_file_ops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->lock);
diff --git a/drivers/timers/pulsecount.c b/drivers/timers/pulsecount.c
index d2c1677efc7..3649588ecf5 100644
--- a/drivers/timers/pulsecount.c
+++ b/drivers/timers/pulsecount.c
@@ -338,7 +338,7 @@ int pulsecount_register(FAR const char *path,
   upper->dev = dev;
 
   _info("Registering %s\n", path);
-  return register_driver(path, &g_pulsecount_fops, 0666, upper);
+  return register_driver(path, &g_pulsecount_fops, 0600, upper);
 }
 
 void pulsecount_expired(FAR void *handle)
diff --git a/drivers/timers/pwm.c b/drivers/timers/pwm.c
index 8714abbc745..3c0e28d7a54 100644
--- a/drivers/timers/pwm.c
+++ b/drivers/timers/pwm.c
@@ -501,7 +501,7 @@ int pwm_register(FAR const char *path, FAR struct pwm_lowerhalf_s *dev)
   /* Register the PWM device */
 
   pwminfo("Registering %s\n", path);
-  return register_driver(path, &g_pwmops, 0666, upper);
+  return register_driver(path, &g_pwmops, 0600, upper);
 }
 
 #endif /* CONFIG_PWM */
diff --git a/drivers/timers/rtc.c b/drivers/timers/rtc.c
index cd26dcb2e4b..ca2b60513a0 100644
--- a/drivers/timers/rtc.c
+++ b/drivers/timers/rtc.c
@@ -854,7 +854,7 @@ int rtc_initialize(int minor, FAR struct rtc_lowerhalf_s *lower)
 
   /* And, finally, register the new RTC driver */
 
-  ret = register_driver(devpath, &g_rtc_fops, 0666, upper);
+  ret = register_driver(devpath, &g_rtc_fops, 0600, upper);
   if (ret < 0)
     {
       nxmutex_destroy(&upper->lock);
diff --git a/drivers/timers/timer.c b/drivers/timers/timer.c
index c90aa5bdb1b..71ff26135e9 100644
--- a/drivers/timers/timer.c
+++ b/drivers/timers/timer.c
@@ -558,7 +558,7 @@ FAR void *timer_register(FAR const char *path,
 
   /* Register the timer device */
 
-  ret = register_driver(path, &g_timerops, 0666, upper);
+  ret = register_driver(path, &g_timerops, 0600, upper);
   if (ret < 0)
     {
       tmrerr("ERROR: register_driver failed: %d\n", ret);
diff --git a/drivers/timers/watchdog.c b/drivers/timers/watchdog.c
index 1c8b6230d82..4ddeb6ac640 100644
--- a/drivers/timers/watchdog.c
+++ b/drivers/timers/watchdog.c
@@ -840,7 +840,7 @@ FAR void *watchdog_register(FAR const char *path,
 
   /* Register the watchdog timer device */
 
-  ret = register_driver(path, &g_wdogops, 0666, upper);
+  ret = register_driver(path, &g_wdogops, 0600, upper);
   if (ret < 0)
     {
       wderr("register_driver failed: %d\n", ret);
diff --git a/drivers/usbdev/cdcncm.c b/drivers/usbdev/cdcncm.c
index d528d8f0da4..5407c8ff72f 100644
--- a/drivers/usbdev/cdcncm.c
+++ b/drivers/usbdev/cdcncm.c
@@ -3022,7 +3022,7 @@ static int cdcmbim_classobject(int minor,
       index = self->ncmdriver.dev.netdev.d_ifindex;
 #endif
       snprintf(devname, sizeof(devname), CDC_MBIM_DEVFORMAT, index);
-      ret = register_driver(devname, &g_usbdevfops, 0666, self);
+      ret = register_driver(devname, &g_usbdevfops, 0600, self);
       if (ret < 0)
         {
           nerr("register_driver failed. ret: %d\n", ret);
diff --git a/drivers/usbdev/uvc.c b/drivers/usbdev/uvc.c
index 29c4689a87e..4f5154a545f 100644
--- a/drivers/usbdev/uvc.c
+++ b/drivers/usbdev/uvc.c
@@ -1521,7 +1521,7 @@ int usbdev_uvc_classobject(int minor,
 
   /* Register the character device */
 
-  ret = register_driver(USBUVC_CHARDEV_PATH, &g_uvc_fops, 0666, priv);
+  ret = register_driver(USBUVC_CHARDEV_PATH, &g_uvc_fops, 0600, priv);
   if (ret < 0)
     {
       uerr("register_driver failed: %d\n", ret);
diff --git a/drivers/usbhost/usbhost_cdcmbim.c b/drivers/usbhost/usbhost_cdcmbim.c
index dce2552aa68..a8a54b88a33 100644
--- a/drivers/usbhost/usbhost_cdcmbim.c
+++ b/drivers/usbhost/usbhost_cdcmbim.c
@@ -1581,7 +1581,7 @@ static inline int usbhost_devinit(FAR struct usbhost_cdcmbim_s *priv)
 
       uinfo("Register character driver\n");
       usbhost_mkdevname(priv, devname);
-      ret = register_driver(devname, &g_cdcwdm_fops, 0666, priv);
+      ret = register_driver(devname, &g_cdcwdm_fops, 0600, priv);
     }
 
   if (priv->intin)
diff --git a/drivers/usbhost/usbhost_hidkbd.c b/drivers/usbhost/usbhost_hidkbd.c
index 470985e9752..a52625257b5 100644
--- a/drivers/usbhost/usbhost_hidkbd.c
+++ b/drivers/usbhost/usbhost_hidkbd.c
@@ -1991,7 +1991,7 @@ static inline int usbhost_devinit(FAR struct usbhost_state_s *priv)
 
   uinfo("Register driver\n");
   usbhost_mkdevname(priv, devname);
-  ret = register_driver(devname, &g_hidkbd_fops, 0666, priv);
+  ret = register_driver(devname, &g_hidkbd_fops, 0600, priv);
 
   /* We now have to be concerned about asynchronous modification of crefs
    * because the driver has been registered.
diff --git a/drivers/usbhost/usbhost_hidmouse.c b/drivers/usbhost/usbhost_hidmouse.c
index 7c52e844c52..6849efdef7b 100644
--- a/drivers/usbhost/usbhost_hidmouse.c
+++ b/drivers/usbhost/usbhost_hidmouse.c
@@ -1633,7 +1633,7 @@ static inline int usbhost_devinit(FAR struct usbhost_state_s *priv)
 
   uinfo("Register driver\n");
   usbhost_mkdevname(priv, devname);
-  ret = register_driver(devname, &g_hidmouse_fops, 0666, priv);
+  ret = register_driver(devname, &g_hidmouse_fops, 0600, priv);
 
   /* We now have to be concerned about asynchronous modification of crefs
    * because the driver has been registered.
diff --git a/drivers/usbhost/usbhost_xboxcontroller.c b/drivers/usbhost/usbhost_xboxcontroller.c
index c1223dd1a2a..81f3dc7f9ce 100644
--- a/drivers/usbhost/usbhost_xboxcontroller.c
+++ b/drivers/usbhost/usbhost_xboxcontroller.c
@@ -1355,7 +1355,7 @@ static inline int usbhost_devinit(FAR struct usbhost_state_s *priv)
 
   uinfo("Register block driver\n");
   usbhost_mkdevname(priv, devname);
-  ret = register_driver(devname, &g_xboxcontroller_fops, 0666, priv);
+  ret = register_driver(devname, &g_xboxcontroller_fops, 0600, priv);
 
   /* Check if we successfully initialized. We now have to be concerned
    * about asynchronous modification of crefs because the block
diff --git a/drivers/usbmisc/fusb301.c b/drivers/usbmisc/fusb301.c
index fd0517d871c..1f7d6f45d97 100644
--- a/drivers/usbmisc/fusb301.c
+++ b/drivers/usbmisc/fusb301.c
@@ -787,7 +787,7 @@ int fusb301_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fusb301ops, 0666, priv);
+  ret = register_driver(devpath, &g_fusb301ops, 0600, priv);
   if (ret < 0)
     {
       fusb301_err("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/usbmisc/fusb302.c b/drivers/usbmisc/fusb302.c
index 160de6912af..16bd73f1c9b 100644
--- a/drivers/usbmisc/fusb302.c
+++ b/drivers/usbmisc/fusb302.c
@@ -1920,7 +1920,7 @@ int fusb302_register(FAR const char *devpath,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fusb302ops, 0666, priv);
+  ret = register_driver(devpath, &g_fusb302ops, 0600, priv);
   if (ret < 0)
     {
       fusb302_err("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/usbmisc/fusb303.c b/drivers/usbmisc/fusb303.c
index dd579cc939f..c945f2855a7 100644
--- a/drivers/usbmisc/fusb303.c
+++ b/drivers/usbmisc/fusb303.c
@@ -975,7 +975,7 @@ int fusb303_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_fusb303ops, 0666, priv);
+  ret = register_driver(devpath, &g_fusb303ops, 0600, priv);
   if (ret < 0)
     {
       fusb303_err("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/usbmisc/stusb4500.c b/drivers/usbmisc/stusb4500.c
index 175d82f2ca3..0e64555381c 100644
--- a/drivers/usbmisc/stusb4500.c
+++ b/drivers/usbmisc/stusb4500.c
@@ -601,7 +601,7 @@ int stusb4500_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_stusb4500ops, 0666, priv);
+  ret = register_driver(devpath, &g_stusb4500ops, 0600, priv);
   if (ret < 0)
     {
       stusb4500_err("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/usrsock/usrsock_dev.c b/drivers/usrsock/usrsock_dev.c
index 546325473b0..085db638c3f 100644
--- a/drivers/usrsock/usrsock_dev.c
+++ b/drivers/usrsock/usrsock_dev.c
@@ -523,7 +523,7 @@ int usrsock_request(FAR struct iovec *iov, unsigned int iovcnt)
 
 void usrsock_register(void)
 {
-  register_driver("/dev/usrsock", &g_usrsockdevops, 0666,
+  register_driver("/dev/usrsock", &g_usrsockdevops, 0600,
                   &g_usrsockdev);
 }
 
diff --git a/drivers/video/fb.c b/drivers/video/fb.c
index 461a13ce1bb..ca6ebe4a866 100644
--- a/drivers/video/fb.c
+++ b/drivers/video/fb.c
@@ -2017,7 +2017,7 @@ int fb_register_device(int display, int plane,
       snprintf(devname, sizeof(devname), "/dev/fb%d.%d", display, plane);
     }
 
-  ret = register_driver(devname, &g_fb_fops, 0666, fb);
+  ret = register_driver(devname, &g_fb_fops, 0600, fb);
 
   if (ret < 0)
     {
diff --git a/drivers/video/mipidsi/mipi_dsi_device_driver.c b/drivers/video/mipidsi/mipi_dsi_device_driver.c
index 3732b909195..6b45ce96a0c 100644
--- a/drivers/video/mipidsi/mipi_dsi_device_driver.c
+++ b/drivers/video/mipidsi/mipi_dsi_device_driver.c
@@ -224,7 +224,7 @@ int mipi_dsi_device_driver_register(FAR struct mipi_dsi_device *device)
   snprintf(devpath, sizeof(devpath), MIPI_DSI_DEVNAME_FMT, host->bus,
            device->channel, device->name);
 
-  ret = register_driver(devpath, &g_dsi_dev_fops, 0666, priv);
+  ret = register_driver(devpath, &g_dsi_dev_fops, 0600, priv);
   if (ret < 0)
     {
       nxmutex_destroy(&priv->lock);
diff --git a/drivers/video/mipidsi/mipi_dsi_host_driver.c b/drivers/video/mipidsi/mipi_dsi_host_driver.c
index 9bc2b77bb22..edfd08cc680 100644
--- a/drivers/video/mipidsi/mipi_dsi_host_driver.c
+++ b/drivers/video/mipidsi/mipi_dsi_host_driver.c
@@ -195,7 +195,7 @@ int mipi_dsi_host_driver_register(FAR struct mipi_dsi_host *host)
 #endif
 
       snprintf(name, sizeof(name), MIPI_DSI_HOSTNAME_FMT, host->bus);
-      ret = register_driver(name, &g_dsi_host_fops, 0666, priv);
+      ret = register_driver(name, &g_dsi_host_fops, 0600, priv);
       if (ret < 0)
         {
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
diff --git a/drivers/video/v4l2_core.c b/drivers/video/v4l2_core.c
index 6cb896b4b10..2392367da86 100644
--- a/drivers/video/v4l2_core.c
+++ b/drivers/video/v4l2_core.c
@@ -560,7 +560,7 @@ int video_register(FAR const char *devpath, FAR struct v4l2_s *v4l2)
 
   /* Register the character driver */
 
-  ret = register_driver(devpath, &g_v4l2_fops, 0666, v4l2);
+  ret = register_driver(devpath, &g_v4l2_fops, 0600, v4l2);
   if (ret < 0)
     {
       verr("Failed to register driver: %d\n", ret);
diff --git a/drivers/virtio/virtio-rng.c b/drivers/virtio/virtio-rng.c
index 45ab8dc4613..3edcd0bcea2 100644
--- a/drivers/virtio/virtio-rng.c
+++ b/drivers/virtio/virtio-rng.c
@@ -249,7 +249,7 @@ static int virtio_rng_probe(FAR struct virtio_device *vdev)
 #endif
     }
 
-  ret = register_driver(priv->name, &g_virtio_rng_ops, 0444, priv);
+  ret = register_driver(priv->name, &g_virtio_rng_ops, 0400, priv);
   if (ret < 0)
     {
       vrterr("Register NuttX driver failed, ret=%d\n", ret);
@@ -257,7 +257,7 @@ static int virtio_rng_probe(FAR struct virtio_device *vdev)
     }
 
 #ifdef CONFIG_DEV_URANDOM
-  ret = register_driver(priv->uname, &g_virtio_rng_ops, 0444, priv);
+  ret = register_driver(priv->uname, &g_virtio_rng_ops, 0400, priv);
   if (ret < 0)
     {
       vrterr("Register NuttX driver failed, ret=%d\n", ret);
diff --git a/drivers/virtio/virtio-rpmb.c b/drivers/virtio/virtio-rpmb.c
index 2f542929bc0..d395cd9f901 100644
--- a/drivers/virtio/virtio-rpmb.c
+++ b/drivers/virtio/virtio-rpmb.c
@@ -261,7 +261,7 @@ static int virtio_rpmb_probe(FAR struct virtio_device *vdev)
       goto err_with_priv;
     }
 
-  ret = register_driver(VIRTIO_RPMB_DEVNAME, &g_virtio_rpmb_ops, 0666,
+  ret = register_driver(VIRTIO_RPMB_DEVNAME, &g_virtio_rpmb_ops, 0600,
                         priv);
   if (ret < 0)
     {
diff --git a/drivers/wireless/cc1101.c b/drivers/wireless/cc1101.c
index e3a872b4d42..d8a69e077ee 100644
--- a/drivers/wireless/cc1101.c
+++ b/drivers/wireless/cc1101.c
@@ -1740,7 +1740,7 @@ int cc1101_register(FAR const char *path, FAR struct cc1101_dev_s *dev)
       return -ENODEV;
     }
 
-  return register_driver(path, &g_cc1101ops, 0666, dev);
+  return register_driver(path, &g_cc1101ops, 0600, dev);
 }
 
 /****************************************************************************
diff --git a/drivers/wireless/gs2200m.c b/drivers/wireless/gs2200m.c
index 59d9a9c94ae..1e45f31768f 100644
--- a/drivers/wireless/gs2200m.c
+++ b/drivers/wireless/gs2200m.c
@@ -3519,7 +3519,7 @@ FAR void *gs2200m_register(FAR const char *devpath,
       goto errout;
     }
 
-  ret = register_driver(devpath, &g_gs2200m_fops, 0666, dev);
+  ret = register_driver(devpath, &g_gs2200m_fops, 0600, dev);
   if (ret < 0)
     {
       wlerr("Failed to register driver: %d\n", ret);
diff --git a/drivers/wireless/lpwan/rn2xx3/rn2xx3.c b/drivers/wireless/lpwan/rn2xx3/rn2xx3.c
index bc3ea4754b2..2d1624d91b1 100644
--- a/drivers/wireless/lpwan/rn2xx3/rn2xx3.c
+++ b/drivers/wireless/lpwan/rn2xx3/rn2xx3.c
@@ -1913,7 +1913,7 @@ int rn2xx3_register(FAR const char *devpath, FAR const char *uartpath)
 
   /* Register driver */
 
-  err = register_driver(devpath, &g_rn2xx3fops, 0666, priv);
+  err = register_driver(devpath, &g_rn2xx3fops, 0600, priv);
   if (err < 0)
     {
       wlerr("Failed to register RN2xx3 driver: %d\n", err);
diff --git a/drivers/wireless/lpwan/sx126x/sx126x.c b/drivers/wireless/lpwan/sx126x/sx126x.c
index c99882f999f..500ee9d1d6f 100644
--- a/drivers/wireless/lpwan/sx126x/sx126x.c
+++ b/drivers/wireless/lpwan/sx126x/sx126x.c
@@ -1402,6 +1402,6 @@ void sx126x_register(FAR struct spi_dev_s *spi,
 
   sx126x_attachirq0(dev, sx126x_irq0handler, dev);
 
-  (void)register_driver(path, &sx126x_ops, 0666,
+  (void)register_driver(path, &sx126x_ops, 0600,
                         dev);
 }
diff --git a/drivers/wireless/lpwan/sx127x/sx127x.c b/drivers/wireless/lpwan/sx127x/sx127x.c
index f29e9f2635c..8b3f334a60e 100644
--- a/drivers/wireless/lpwan/sx127x/sx127x.c
+++ b/drivers/wireless/lpwan/sx127x/sx127x.c
@@ -4720,7 +4720,7 @@ int sx127x_register(FAR struct spi_dev_s *spi,
 
   wlinfo("Registering " SX127X_DEV_NAME "\n");
 
-  ret = register_driver(SX127X_DEV_NAME, &g_sx127x_fops, 0666, dev);
+  ret = register_driver(SX127X_DEV_NAME, &g_sx127x_fops, 0600, dev);
   if (ret < 0)
     {
       wlerr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/drivers/wireless/nrf24l01.c b/drivers/wireless/nrf24l01.c
index d1543b9d1f1..d2ffd459920 100644
--- a/drivers/wireless/nrf24l01.c
+++ b/drivers/wireless/nrf24l01.c
@@ -1582,7 +1582,7 @@ int nrf24l01_register(FAR struct spi_dev_s *spi,
 
   wlinfo("Registering " DEV_NAME "\n");
 
-  ret = register_driver(DEV_NAME, &g_nrf24l01_fops, 0666, dev);
+  ret = register_driver(DEV_NAME, &g_nrf24l01_fops, 0600, dev);
   if (ret < 0)
     {
       wlerr("ERROR: register_driver() failed: %d\n", ret);
diff --git a/fs/mount/fs_automount.c b/fs/mount/fs_automount.c
index eb637599ab3..2d5988aeea4 100644
--- a/fs/mount/fs_automount.c
+++ b/fs/mount/fs_automount.c
@@ -858,7 +858,7 @@ FAR void *automount_initialize(FAR const struct automount_lower_s *lower)
   snprintf(devpath, PATH_MAX,
            CONFIG_FS_AUTOMOUNTER_VFS_PATH "%s", lower->mountpoint);
 
-  ret = register_driver(devpath, &g_automount_fops, 0444, priv);
+  ret = register_driver(devpath, &g_automount_fops, 0400, priv);
   lib_put_pathbuffer(devpath);
   if (ret < 0)
     {
diff --git a/graphics/nxterm/nxterm_register.c b/graphics/nxterm/nxterm_register.c
index 11b9841e439..3c54f15a65c 100644
--- a/graphics/nxterm/nxterm_register.c
+++ b/graphics/nxterm/nxterm_register.c
@@ -139,7 +139,7 @@ FAR struct nxterm_state_s *
   /* Register the driver */
 
   snprintf(devname, sizeof(devname), NX_DEVNAME_FORMAT, minor);
-  ret = register_driver(devname, &g_nxterm_drvrops, 0666, priv);
+  ret = register_driver(devname, &g_nxterm_drvrops, 0600, priv);
   if (ret < 0)
     {
       gerr("ERROR: Failed to register %s\n", devname);
diff --git a/wireless/ieee802154/mac802154_device.c b/wireless/ieee802154/mac802154_device.c
index 3e3cec9b11a..33e34dbf2f2 100644
--- a/wireless/ieee802154/mac802154_device.c
+++ b/wireless/ieee802154/mac802154_device.c
@@ -865,7 +865,7 @@ int mac802154dev_register(MACHANDLE mac, int minor)
 
   /* Register the mac character driver */
 
-  ret = register_driver(devname, &g_mac802154dev_fops, 0666, dev);
+  ret = register_driver(devname, &g_mac802154dev_fops, 0600, dev);
   if (ret < 0)
     {
       wlerr("ERROR: register_driver failed: %d\n", ret);