[PATCH] ssh dump: create random-seed manually

[WANG Chao]

In ssh dump, we use random-seed to feed /dev/urandom. Since the systemd
random-seed file could change location, it's better we create our
own random-seed.

The discussion is listed below for future reference:
https://lists.fedoraproject.org/pipermail/kexec/2014-January/000340.html

Signed-off-by: WANG Chao 
---
 dracut-module-setup.sh | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index c013430..a4351b9 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -392,13 +392,26 @@ kdump_check_iscsi_targets () {
     }
 }

+# Install a random seed used to feed /dev/urandom
+# By the time kdump service starts, /dev/uramdom is already fed by systemd
+kdump_install_random_seed() {
+    local poolsize=`cat /proc/sys/kernel/random/poolsize`
+
+    if [ ! -d ${initdir}/var/lib/ ]; then
+        mkdir -p ${initdir}/var/lib/
+    fi
+
+    dd if=/dev/urandom of=${initdir}/var/lib/random-seed \
+       bs=$poolsize count=1 2> /dev/null
+}
+

install() {
     kdump_install_conf
     >"$initdir/lib/dracut/no-emergency-shell"

if is_ssh_dump_target; then
-        dracut_install /var/lib/random-seed || exit $?
+        kdump_install_random_seed
     fi
     dracut_install -o /etc/adjtime /etc/localtime
     inst "$moddir/monitor_dd_progress" "/kdumpscripts/monitor_dd_progress"

[Vivek Goyal]

On Tue, Jan 28, 2014 at 12:24:43PM +0800, WANG Chao wrote:
> In ssh dump, we use random-seed to feed /dev/urandom. Since the systemd
> random-seed file could change location, it's better we create our
> own random-seed.
>
> The discussion is listed below for future reference:
> https://lists.fedoraproject.org/pipermail/kexec/2014-January/000340.html
>
> Signed-off-by: WANG Chao

Acked-by: Vivek Goyal

Vivek
> dracut-module-setup.sh | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
> index c013430..a4351b9 100755
> --- a/dracut-module-setup.sh
> +++ b/dracut-module-setup.sh
> @@ -392,13 +392,26 @@ kdump_check_iscsi_targets () {
>      }
>  }
>
> +# Install a random seed used to feed /dev/urandom
> +# By the time kdump service starts, /dev/uramdom is already fed by systemd
> +kdump_install_random_seed() {
> local poolsize=`cat /proc/sys/kernel/random/poolsize`
> if [ ! -d ${initdir}/var/lib/ ]; then
>    mkdir -p ${initdir}/var/lib/
> fi
> dd if=/dev/urandom of=${initdir}/var/lib/random-seed \
>   bs=$poolsize count=1 2> /dev/null
>
> +}
>
> install() {
>      kdump_install_conf
>      >"$initdir/lib/dracut/no-emergency-shell"
>  if is_ssh_dump_target; then
>    dracut_install /var/lib/random-seed || exit $?
>    kdump_install_random_seed
> fi
>    dracut_install -o /etc/adjtime /etc/localtime
>    inst "$moddir/monitor_dd_progress" "/kdumpscripts/monitor_dd_progress"
>
> -- 
> 1.8.4.2