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busybox: provide /etc/mdev.conf if mdev is used

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Without an mdev.conf file installed, mdev generates some /dev entries in
an incorrect or non-standard way. Some examples:
 1. /dev/null has permissions 660, but it should be accessible to normal
    users;
 2. alsa devices get created in /dev, not /dev/snd as is more common,
    and as the default value of BR2_PACKAGE_ALSA_LIB_DEVDIR suggests;
 3. event<N> files are created in /dev, not /dev/input.

This mdev.conf is a selection from the examples provided in the busybox
sources with minor tweaks.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Luca Ceresoli 2011-07-11 12:25:51 +02:00 committed by Peter Korsgaard
parent bd76bc5f80
commit fc71f7e6f2
2 changed files with 41 additions and 0 deletions
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6
package/busybox/busybox.mk
View file

@ -33,6 +33,11 @@ ifeq ($(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),y)
define BUSYBOX_INSTALL_MDEV_SCRIPT
install -m 0755 package/busybox/S10mdev $(TARGET_DIR)/etc/init.d
endef
define BUSYBOX_INSTALL_MDEV_CONF
[ -f $(TARGET_DIR)/etc/mdev.conf ] || \
install -D -m 0644 package/busybox/mdev.conf \
$(TARGET_DIR)/etc/mdev.conf
endef
define BUSYBOX_SET_MDEV
$(call KCONFIG_ENABLE_OPT,CONFIG_MDEV,$(BUSYBOX_BUILD_CONFIG))
$(call KCONFIG_ENABLE_OPT,CONFIG_FEATURE_MDEV_CONF,$(BUSYBOX_BUILD_CONFIG))
@ -159,6 +164,7 @@ define BUSYBOX_INSTALL_TARGET_CMDS
$(TARGET_DIR)/usr/share/udhcpc/default.script; \
fi
$(BUSYBOX_INSTALL_MDEV_SCRIPT)
$(BUSYBOX_INSTALL_MDEV_CONF)
$(BUSYBOX_INSTALL_LOGGING_SCRIPT)
endef

35
package/busybox/mdev.conf Normal file
View file

@ -0,0 +1,35 @@
# null may already exist; therefore ownership has to be changed with command
null root:root 666 @chmod 666 $MDEV
zero root:root 666
full root:root 666
random root:root 444
urandom root:root 444
hwrandom root:root 444
grsec root:root 660
kmem root:root 640
mem root:root 640
port root:root 640
# console may already exist; therefore ownership has to be changed with command
console root:tty 600 @chmod 600 $MDEV
ptmx root:tty 666
pty.* root:tty 660
# Typical devices
tty root:tty 666
tty[0-9]* root:tty 660
vcsa*[0-9]* root:tty 660
ttyS[0-9]* root:root 660
# alsa sound devices
pcm.* root:audio 660 =snd/
control.* root:audio 660 =snd/
midi.* root:audio 660 =snd/
seq root:audio 660 =snd/
timer root:audio 660 =snd/
# input stuff
event[0-9]+ root:root 640 =input/
mice root:root 640 =input/
mouse[0-9] root:root 640 =input/
ts[0-9] root:root 600 =input/