feat: add various system and theme icons, configuration files, and support assets

squashfs-root/etc/sysctl.d/10-zeropage.conf

@@ -0,0 +1,9 @@
+# Protect the zero page of memory from userspace mmap to prevent kernel
+# NULL-dereference attacks against potential future kernel security
+# vulnerabilities.  (Added in kernel 2.6.23.)
+#
+# While this default is built into the Ubuntu kernel, there is no way to
+# restore the kernel default if the value is changed during runtime; for
+# example via package removal (e.g. wine, dosemu).  Therefore, this value
+# is reset to the secure default each time the sysctl values are loaded.
+vm.mmap_min_addr = 65536