File kdump-remove-vm-sysctl.patch of Package kdump

From: Petr Tesarik <ptesarik@suse.com>
Subject: Remove vm. sysctls from kdump initrd
References: bsc#927451, bsc#987862
Patch-mainline: v0.8.16
Git-commit: 52fcf6338bfb4e029d96303d4840e995e9da2cc9

Custom sysctl VM settings in the primary system may cause unreasonable
run-time memory requirements in the kdump environment.

Remove such custom sysctl settings from kdump initrd.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
 init/setup-kdump.functions |   33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

--- a/init/setup-kdump.functions
+++ b/init/setup-kdump.functions
@@ -706,7 +706,33 @@ function kdump_init_dirs()						   # {{{
     done
 
     test -e "${root}/kdump/boot" || ln -snf "root/boot" "${root}/kdump/boot"
-}
+}									   # }}}
+
+#
+# Filter out problematic sysctl settings
+# Parameters:
+#   1) root:     initrd temporary root
+function kdump_filter_sysctl()						   # {{{
+{
+    local root="$1"
+
+    local restoreopt=$( shopt -p nullglob )
+    shopt -s nullglob
+
+    for f in \
+	"$root"/boot/sysctl.conf-* \
+	"$root"/run/sysctl.d/*.conf \
+	"$root"/etc/sysctl.d/*.conf \
+	"$root"/usr/local/lib/sysctl.d/*.conf \
+	"$root"/usr/lib/sysctl.d/*.conf \
+	"$root"/lib/sysctl.d/*.conf \
+	"$root"/etc/sysctl.conf
+    do
+	sed -i -e '/^[ \t]*vm\./d' "$f"
+    done
+
+    eval "$restoreopt"
+}									   # }}}
 
 #
 # Set up or create all necessary files
@@ -753,5 +779,10 @@ function kdump_setup_files()						   # {
     #
     kdump_modify_multipath "$mpathdevs" > "${outdir}/etc/multipath.conf"
 
+    #
+    # filter out problematic sysctl settings
+    #
+    kdump_filter_sysctl "$outdir"
+
     return 0
 }									   # }}}