Kernel: Use the whole kernel PD range when randomizing the KASLR offset

Now that we reclaim the memory range that is created by KASLR before
the start of the kernel image, there's no need to be conservative with
the KASLR offset.

1 files changed, 2 insertions, 1 deletions

diff --git a/Kernel/Memory/PageDirectory.cpp b/Kernel/Memory/PageDirectory.cpp
index 6da3d97434..dc0a652860 100644
--- a/Kernel/Memory/PageDirectory.cpp
+++ b/Kernel/Memory/PageDirectory.cpp
@@ -36,7 +36,8 @@ UNMAP_AFTER_INIT NonnullRefPtr<PageDirectory> PageDirectory::must_create_kernel_
 {
     auto directory = adopt_ref_if_nonnull(new (nothrow) PageDirectory).release_nonnull();
 
-    MUST(directory->m_range_allocator.initialize_with_range(VirtualAddress(default_kernel_load_base), KERNEL_PD_END - default_kernel_load_base));
+    auto kernel_range_start = kernel_mapping_base + 2 * MiB; // The first 2 MiB are used for mapping the pre-kernel
+    MUST(directory->m_range_allocator.initialize_with_range(VirtualAddress(kernel_range_start), KERNEL_PD_END - kernel_range_start));
     // Carve out the whole page directory covering the kernel image to make MemoryManager::initialize_physical_pages() happy
     FlatPtr start_of_range = ((FlatPtr)start_of_kernel_image & ~(FlatPtr)0x1fffff);
     FlatPtr end_of_range = ((FlatPtr)end_of_kernel_image & ~(FlatPtr)0x1fffff) + 0x200000;