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Kernel: Propagate overflow errors from Memory::page_round_up

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Fixes #11402.
This commit is contained in:
Guilherme Goncalves 2021-12-24 11:22:11 -03:00 • committed by Andreas Kling
parent 11599a3342
commit 33b78915d3
31 changed files with 112 additions and 100 deletions
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16
Kernel/Memory/MemoryManager.cpp
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@ -45,6 +45,14 @@ __attribute__((section(".super_pages"))) static u8 super_pages[4 * MiB];
namespace Kernel::Memory {
ErrorOr<FlatPtr> page_round_up(FlatPtr x)
{
if (x > (explode_byte(0xFF) & ~0xFFF)) {
return Error::from_errno(EINVAL);
}
return (((FlatPtr)(x)) + PAGE_SIZE - 1) & (~(PAGE_SIZE - 1));
}
// NOTE: We can NOT use Singleton for this class, because
// MemoryManager::initialize is called *before* global constructors are
// run. If we do, then Singleton would get re-initialized, causing
@ -137,7 +145,7 @@ void MemoryManager::unmap_text_after_init()
SpinlockLocker mm_lock(s_mm_lock);
auto start = page_round_down((FlatPtr)&start_of_unmap_after_init);
auto end = page_round_up((FlatPtr)&end_of_unmap_after_init);
auto end = page_round_up((FlatPtr)&end_of_unmap_after_init).release_value_but_fixme_should_propagate_errors();
// Unmap the entire .unmap_after_init section
for (auto i = start; i < end; i += PAGE_SIZE) {
@ -155,7 +163,7 @@ UNMAP_AFTER_INIT void MemoryManager::protect_ksyms_after_init()
SpinlockLocker page_lock(kernel_page_directory().get_lock());
auto start = page_round_down((FlatPtr)start_of_kernel_ksyms);
auto end = page_round_up((FlatPtr)end_of_kernel_ksyms);
auto end = page_round_up((FlatPtr)end_of_kernel_ksyms).release_value_but_fixme_should_propagate_errors();
for (auto i = start; i < end; i += PAGE_SIZE) {
auto& pte = *ensure_pte(kernel_page_directory(), VirtualAddress(i));
@ -213,7 +221,7 @@ UNMAP_AFTER_INIT void MemoryManager::parse_memory_map()
// Register used memory regions that we know of.
m_used_memory_ranges.ensure_capacity(4);
m_used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::LowMemory, PhysicalAddress(0x00000000), PhysicalAddress(1 * MiB) });
m_used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::Kernel, PhysicalAddress(virtual_to_low_physical((FlatPtr)start_of_kernel_image)), PhysicalAddress(page_round_up(virtual_to_low_physical((FlatPtr)end_of_kernel_image))) });
m_used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::Kernel, PhysicalAddress(virtual_to_low_physical((FlatPtr)start_of_kernel_image)), PhysicalAddress(page_round_up(virtual_to_low_physical((FlatPtr)end_of_kernel_image)).release_value_but_fixme_should_propagate_errors()) });
if (multiboot_flags & 0x4) {
auto* bootmods_start = multiboot_copy_boot_modules_array;
@ -380,7 +388,7 @@ UNMAP_AFTER_INIT void MemoryManager::initialize_physical_pages()
// Calculate how many bytes the array will consume
auto physical_page_array_size = m_physical_page_entries_count * sizeof(PhysicalPageEntry);
auto physical_page_array_pages = page_round_up(physical_page_array_size) / PAGE_SIZE;
auto physical_page_array_pages = page_round_up(physical_page_array_size).release_value_but_fixme_should_propagate_errors() / PAGE_SIZE;
VERIFY(physical_page_array_pages * PAGE_SIZE >= physical_page_array_size);
// Calculate how many page tables we will need to be able to map them all