fix(squash): build ld cache for squash loader

Commit dc21638c3f0a fixes kdump kernel crash, due to non-conventional
library path in powerpc, by copying /etc/ld.so.cache under initdir.
While that works in general, it is vulnerable to failure because of
missing links, when the CPU is reconfigured to run in compatibility
mode of older CPU version. Avoid this by running ldconfig for squash
loader to create the necessary links & ld cache for it. Doing this
also saves a few kilobyes of space as the copied ld cache is bigger
in size than the one needed for squash loader environment.

Fixes: dc21638c3f0a ("fix(squash): keep ld cache under initdir")
Cc: Pingfan Liu <piliu@redhat.com>
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>

diff --git a/dracut-init.sh b/dracut-init.sh
index 41830e1a9b8418720c0281f49a7a9e2b0284157e..4ec600fb047955a37970617e05c4a537dede0902 100755 (executable)
--- a/dracut-init.sh
+++ b/dracut-init.sh
@@ -541,6 +541,20 @@ inst_rules_wildcard() {
     [[ $_found ]] || dinfo "Skipping udev rule: $_rule"
 }
 
+# make sure that library links are correct and up to date
+build_ld_cache() {
+    for f in "$dracutsysrootdir"/etc/ld.so.conf "$dracutsysrootdir"/etc/ld.so.conf.d/*; do
+        [[ -f $f ]] && inst_simple "${f#$dracutsysrootdir}"
+    done
+    if ! $DRACUT_LDCONFIG -r "$initdir" -f /etc/ld.so.conf; then
+        if [[ $EUID == 0 ]]; then
+            derror "ldconfig exited ungracefully"
+        else
+            derror "ldconfig might need uid=0 (root) for chroot()"
+        fi
+    fi
+}
+
 prepare_udev_rules() {
     if [ -z "$UDEVVERSION" ]; then
         UDEVVERSION=$(udevadm --version)

diff --git a/dracut.sh b/dracut.sh
index c612a296aee2e65b7dfcc365065ab308fab49452..0ed86e1e2f7509d9ff09892066655a6320ac28f4 100755 (executable)
--- a/dracut.sh
+++ b/dracut.sh
@@ -2360,16 +2360,7 @@ fi
 
 if [[ $kernel_only != yes ]]; then
     # make sure that library links are correct and up to date
-    for f in "$dracutsysrootdir"/etc/ld.so.conf "$dracutsysrootdir"/etc/ld.so.conf.d/*; do
-        [[ -f $f ]] && inst_simple "${f#$dracutsysrootdir}"
-    done
-    if ! $DRACUT_LDCONFIG -r "$initdir" -f /etc/ld.so.conf; then
-        if [[ $EUID == 0 ]]; then
-            derror "ldconfig exited ungracefully"
-        else
-            derror "ldconfig might need uid=0 (root) for chroot()"
-        fi
-    fi
+    build_ld_cache
 fi
 
 if dracut_module_included "squash"; then

diff --git a/modules.d/99squash/module-setup.sh b/modules.d/99squash/module-setup.sh
index c42eb679d4137ca961306ad441bb4f2d8beef104..f31ff556b60b5e4821b6ed607d97abebaa7699ce 100755 (executable)
--- a/modules.d/99squash/module-setup.sh
+++ b/modules.d/99squash/module-setup.sh
@@ -28,11 +28,6 @@ installpost() {
         [[ $squash_dir == "$i"/* ]] || mv "$i" "$squash_dir"/
     done
 
-    # initdir also needs ld.so.* to make ld.so work
-    inst /etc/ld.so.cache
-    inst /etc/ld.so.conf
-    inst_dir /etc/ld.so.conf.d
-
     # Create mount points for squash loader
     mkdir -p "$initdir"/squash/
     mkdir -p "$squash_dir"/squash/
@@ -67,6 +62,9 @@ installpost() {
     ln_r /usr/bin /bin
     ln_r /usr/sbin /sbin
     inst_simple "$moddir"/init-squash.sh /init
+
+    # make sure that library links are correct and up to date for squash loader
+    build_ld_cache
 }
 
 install() {