Load the SELinux policy after switch_root. This fixes

the bootup process with recent kernels, as it was
getting stuck on Permission Denied errors, due to the
early SELinux policy load.

Thanks to Laszlo Gombos for reviewing this patch and
suggesting to obsolete the SELinux load policy module
instead of removing it completely.

Signed-off-by: Guido Trentalancia <[email protected]>
---
 modules.d/98selinux/selinux-loadpolicy.sh |    5 +-
 modules.d/99base/init.sh                  |   61 ++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 1 deletion(-)

modules.d/98selinux/selinux-loadpolicy.sh

@@ -1,6 +1,9 @@
 #!/bin/sh
 
-# FIXME: load selinux policy.  this should really be done after we switchroot
+# SELinux policy load should be done after switch_root.
+#
+# This module is therefore obsolete and it is left here only
+# for backwards compatibility.
 
 rd_load_policy() {
     # If SELinux is disabled exit now

modules.d/99base/init.sh

@@ -5,6 +5,7 @@
 # Copyright 2008-2010, Red Hat, Inc.
 # Harald Hoyer <[email protected]>
 # Jeremy Katz <[email protected]>
+# Copyright 2024 Guido Trentalancia <[email protected]>
 
 export -p > /tmp/export.orig
 
@@ -397,3 +398,63 @@ else
         emergency_shell
     }
 fi
+
+# If SELinux is disabled exit now
+getarg "selinux=0" > /dev/null && return 0
+
+SELINUX="enforcing"
+# shellcheck disable=SC1090
+[ -e "/etc/selinux/config" ] && . "/etc/selinux/config"
+
+# Check whether SELinux is in permissive mode
+permissive=0
+
+if getarg "enforcing=0" > /dev/null || [ "$SELINUX" = "permissive" ]; then
+    permissive=1
+fi
+
+# Finally load the SELinux policy and perform relabeling if needed
+if [ -x "/sbin/load_policy" ] || [ -x "/usr/sbin/load_policy" ]; then
+    local ret=0
+    local out
+    info "Loading SELinux policy"
+
+    if [ -x "/sbin/load_policy" ]; then
+        out=$(LANG=C /sbin/load_policy -i 2>&1)
+        ret=$?
+        info "$out"
+    else
+        out=$(LANG=C /usr/sbin/load_policy -i 2>&1)
+        ret=$?
+        info "$out"
+    fi
+    umount /sys/fs/selinux
+
+    if [ "$SELINUX" = "disabled" ]; then
+        return 0
+    fi
+
+    if [ $ret -eq 0 ] || [ $ret -eq 2 ]; then
+        # If machine requires a relabel, force to permissive mode
+        [ -e "/.autorelabel" ] && LANG=C /usr/sbin/setenforce 0
+        mount --rbind /dev "/dev"
+        LANG=C /sbin/restorecon -R /dev
+        umount -R "/dev"
+        return 0
+    fi
+
+    warn "Initial SELinux policy load failed."
+    if [ $ret -eq 3 ] || [ $permissive -eq 0 ]; then
+        warn "Machine in enforcing mode."
+        warn "Not continuing"
+        emergency_shell -n selinux
+        exit 1
+    fi
+    return 0
+elif [ $permissive -eq 0 ] && [ "$SELINUX" != "disabled" ]; then
+    warn "Machine in enforcing mode and cannot execute load_policy."
+    warn "To disable selinux, add selinux=0 to the kernel command line."
+    warn "Not continuing"
+    emergency_shell -n selinux
+    exit 1
+fi