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dracut-module-setup.sh: change the insecure use of /tmp/*$$* filenames

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Harald warned it's dangerous to use /tmp/*$$* in shell scripts of dracut
modules.

Quote his saying as below:
***************************
This can be exploited so easily and used to overwrite e.g. /etc/shadow.
The only thing you have to do is waiting until the next time the kdump
initramfs is generated on a kernel update.

If at all, please use "$initdir/tmp/" because $initdir is a mktemp generated
directory with a non-guessable name!
**************************

So make a clean up in this patch.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
This commit is contained in:
Baoquan He 2015-02-12 14:40:27 +08:00
parent 84f94be90b
commit 374d8b628b
1 changed files with 15 additions and 11 deletions
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26
dracut-module-setup.sh
View File

@ -3,6 +3,10 @@
. $dracutfunctions
. /lib/kdump/kdump-lib.sh
if ! [[ -d "${initdir}/tmp" ]]; then
mkdir -p "${initdir}/tmp"
fi
check() {
[[ $debug ]] && set -x
#kdumpctl sets this explicitly
@ -146,15 +150,15 @@ kdump_setup_team() {
echo " team=$_netdev:$(echo $_slaves | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/44team.conf
#Buggy version teamdctl outputs to stderr!
#Try to use the latest version of teamd.
teamdctl "$_netdev" config dump > /tmp/$$-$_netdev.conf
teamdctl "$_netdev" config dump > ${initdir}/tmp/$$-$_netdev.conf
if [ $? -ne 0 ]
then
derror "teamdctl failed."
exit 1
fi
inst_dir /etc/teamd
inst_simple /tmp/$$-$_netdev.conf "/etc/teamd/$_netdev.conf"
rm -f /tmp/$$-$_netdev.conf
inst_simple ${initdir}/tmp/$$-$_netdev.conf "/etc/teamd/$_netdev.conf"
rm -f ${initdir}/tmp/$$-$_netdev.conf
}
kdump_setup_vlan() {
@ -328,20 +332,20 @@ default_dump_target_install_conf()
_target=$(kdump_to_udev_name $_target)
fi
echo "$_fstype $_target" >> /tmp/$$-kdump.conf
echo "$_fstype $_target" >> ${initdir}/tmp/$$-kdump.conf
_path=${_save_path##"$_mntpoint"}
#erase the old path line, then insert the parsed path
sed -i "/^path/d" /tmp/$$-kdump.conf
echo "path $_path" >> /tmp/$$-kdump.conf
sed -i "/^path/d" ${initdir}/tmp/$$-kdump.conf
echo "path $_path" >> ${initdir}/tmp/$$-kdump.conf
fi
}
#install kdump.conf and what user specifies in kdump.conf
kdump_install_conf() {
sed -ne '/^#/!p' /etc/kdump.conf > /tmp/$$-kdump.conf
sed -ne '/^#/!p' /etc/kdump.conf > ${initdir}/tmp/$$-kdump.conf
while read config_opt config_val;
do
@ -349,7 +353,7 @@ kdump_install_conf() {
config_val=$(strip_comments $config_val)
case "$config_opt" in
ext[234]|xfs|btrfs|minix|raw)
sed -i -e "s#^$config_opt[[:space:]]\+$config_val#$config_opt $(kdump_to_udev_name $config_val)#" /tmp/$$-kdump.conf
sed -i -e "s#^$config_opt[[:space:]]\+$config_val#$config_opt $(kdump_to_udev_name $config_val)#" ${initdir}/tmp/$$-kdump.conf
;;
ssh|nfs)
kdump_install_net "$config_val"
@ -365,9 +369,9 @@ kdump_install_conf() {
default_dump_target_install_conf
kdump_configure_fence_kdump "/tmp/$$-kdump.conf"
inst "/tmp/$$-kdump.conf" "/etc/kdump.conf"
rm -f /tmp/$$-kdump.conf
kdump_configure_fence_kdump "${initdir}/tmp/$$-kdump.conf"
inst "${initdir}/tmp/$$-kdump.conf" "/etc/kdump.conf"
rm -f ${initdir}/tmp/$$-kdump.conf
}
# Default sysctl parameters should suffice for kdump kernel.