From 0cb4afef6da5488a128e5aaece435e9aa5f5797e Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Fri, 10 Nov 2023 15:19:49 +0100
Subject: Kernel/Memory: Fill new allocations with random data.

This should make it easier to spot uninitalized memory being used.
---
 kernel/arch/i386/mmu.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'kernel/arch')

diff --git a/kernel/arch/i386/mmu.c b/kernel/arch/i386/mmu.c
index 9f20ce0..53aa5dd 100644
--- a/kernel/arch/i386/mmu.c
+++ b/kernel/arch/i386/mmu.c
@@ -3,6 +3,7 @@
 #include <log.h>
 #include <math.h>
 #include <mmu.h>
+#include <random.h>
 
 #define INDEX_FROM_BIT(a) (a / (32))
 #define OFFSET_FROM_BIT(a) (a % (32))
@@ -35,6 +36,7 @@ void *ksbrk(size_t s) {
     // If there is no active pagedirectory we
     // just assume that the memory is
     // already mapped.
+    get_random((void *)rc, data_end - rc);
     return (void *)rc;
   }
   // Determine whether we are approaching a unallocated table
@@ -57,6 +59,7 @@ void *ksbrk(size_t s) {
   assert(((uintptr_t)rc % PAGE_SIZE) == 0);
   memset((void *)rc, 0x00, s);
 
+  get_random((void *)rc, data_end - rc);
   return (void *)rc;
 }
 
-- 
cgit v1.2.3