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Kernel: Add guard pages to kernel and userspace stacks

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Bananymous
2025-07-02 23:12:36 +03:00
parent e1319a06f2
commit 6084aae603
10 changed files with 47 additions and 35 deletions
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13
kernel/include/kernel/Memory/VirtualRange.h
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@@ -15,21 +15,21 @@ namespace Kernel
public:
// Create virtual range to fixed virtual address
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr(PageTable&, vaddr_t, size_t, PageTable::flags_t flags, bool preallocate_pages);
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr(PageTable&, vaddr_t, size_t, PageTable::flags_t flags, bool preallocate_pages, bool add_guard_pages);
// Create virtual range to virtual address range
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr_range(PageTable&, vaddr_t vaddr_start, vaddr_t vaddr_end, size_t, PageTable::flags_t flags, bool preallocate_pages);
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr_range(PageTable&, vaddr_t vaddr_start, vaddr_t vaddr_end, size_t, PageTable::flags_t flags, bool preallocate_pages, bool add_guard_pages);
~VirtualRange();
BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> clone(PageTable&);
vaddr_t vaddr() const { return m_vaddr; }
size_t size() const { return m_size; }
vaddr_t vaddr() const { return m_vaddr + (m_has_guard_pages ? PAGE_SIZE : 0); }
size_t size() const { return m_size - (m_has_guard_pages ? 2 * PAGE_SIZE : 0); }
PageTable::flags_t flags() const { return m_flags; }
paddr_t paddr_of(vaddr_t vaddr) const
{
ASSERT(vaddr % PAGE_SIZE == 0);
const size_t index = (vaddr - m_vaddr) / PAGE_SIZE;
const size_t index = (vaddr - this->vaddr()) / PAGE_SIZE;
ASSERT(index < m_paddrs.size());
const paddr_t paddr = m_paddrs[index];
ASSERT(paddr);
@@ -41,12 +41,13 @@ namespace Kernel
BAN::ErrorOr<void> allocate_page_for_demand_paging(vaddr_t address);
private:
VirtualRange(PageTable&, bool preallocated, vaddr_t, size_t, PageTable::flags_t);
VirtualRange(PageTable&, bool preallocated, bool has_guard_pages, vaddr_t, size_t, PageTable::flags_t);
BAN::ErrorOr<void> initialize();
private:
PageTable& m_page_table;
const bool m_preallocated;
const bool m_has_guard_pages;
const vaddr_t m_vaddr;
const size_t m_size;
const PageTable::flags_t m_flags;