From 67db9f0cfe25e18a43dd29e6c5db4a4ac906f170 Mon Sep 17 00:00:00 2001
From: Mel <mel@rnrd.eu>
Date: Mon, 7 Sep 2026 18:27:16 +0200
Subject: Set 'vm.mmap_rnd_bits' to 18 for Lapin

Signed-off-by: Mel <mel@rnrd.eu>
---
 machines/lapin/devices.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'machines/lapin')

diff --git a/machines/lapin/devices.nix b/machines/lapin/devices.nix
index 239242a..abc7a18 100644
--- a/machines/lapin/devices.nix
+++ b/machines/lapin/devices.nix
@@ -4,6 +4,14 @@
   boot = {
     loader.systemd-boot.enable = true;
     kernelModules = [ ];
+
+    kernel.sysctl = {
+      # nixos likes 24 as the default here, but lapin
+      # somehow only allows upto 18.
+      # TODO: check why it's stuck at 18 in the kernel config.
+      # `zcat /proc/config.gz | grep MMAP_RND_BITS`
+      "vm.mmap_rnd_bits" = 18;
+    };
   };
 
   # testing with replacing swap partitions
-- 
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