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Kernel/LibC: Implement mprotect

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There may be some race conditions with this but i think this is good
enough to start with
This commit is contained in:
Bananymous
2025-08-05 03:09:24 +03:00
parent eb7922ab88
commit f1369c8fd6
18 changed files with 167 additions and 61 deletions
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kernel/kernel/Memory/FileBackedRegion.cpp
+6 -6
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@@ -7,7 +7,7 @@
namespace Kernel
{
BAN::ErrorOr<BAN::UniqPtr<FileBackedRegion>> FileBackedRegion::create(BAN::RefPtr<Inode> inode, PageTable& page_table, off_t offset, size_t size, AddressRange address_range, Type type, PageTable::flags_t flags)
BAN::ErrorOr<BAN::UniqPtr<FileBackedRegion>> FileBackedRegion::create(BAN::RefPtr<Inode> inode, PageTable& page_table, off_t offset, size_t size, AddressRange address_range, Type type, PageTable::flags_t flags, int status_flags)
{
ASSERT(inode->mode().ifreg());
@@ -16,14 +16,14 @@ namespace Kernel
if ((size > (size_t)inode->size() || (size_t)offset > (size_t)inode->size() - size))
return BAN::Error::from_errno(EOVERFLOW);
auto* region_ptr = new FileBackedRegion(inode, page_table, offset, size, type, flags);
auto* region_ptr = new FileBackedRegion(inode, page_table, offset, size, type, flags, status_flags);
if (region_ptr == nullptr)
return BAN::Error::from_errno(ENOMEM);
auto region = BAN::UniqPtr<FileBackedRegion>::adopt(region_ptr);
TRY(region->initialize(address_range));
if (type == Type::PRIVATE && (flags & PageTable::Flags::ReadWrite))
if (type == Type::PRIVATE)
TRY(region->m_dirty_pages.resize(BAN::Math::div_round_up<size_t>(size, PAGE_SIZE)));
LockGuard _(inode->m_mutex);
@@ -39,8 +39,8 @@ namespace Kernel
return region;
}
FileBackedRegion::FileBackedRegion(BAN::RefPtr<Inode> inode, PageTable& page_table, off_t offset, ssize_t size, Type type, PageTable::flags_t flags)
: MemoryRegion(page_table, size, type, flags)
FileBackedRegion::FileBackedRegion(BAN::RefPtr<Inode> inode, PageTable& page_table, off_t offset, ssize_t size, Type type, PageTable::flags_t flags, int status_flags)
: MemoryRegion(page_table, size, type, flags, status_flags)
, m_inode(inode)
, m_offset(offset)
{
@@ -200,7 +200,7 @@ namespace Kernel
BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> FileBackedRegion::clone(PageTable& page_table)
{
const size_t aligned_size = (m_size + PAGE_SIZE - 1) & PAGE_ADDR_MASK;
auto result = TRY(FileBackedRegion::create(m_inode, page_table, m_offset, m_size, { .start = m_vaddr, .end = m_vaddr + aligned_size }, m_type, m_flags));
auto result = TRY(FileBackedRegion::create(m_inode, page_table, m_offset, m_size, { .start = m_vaddr, .end = m_vaddr + aligned_size }, m_type, m_flags, m_status_flags));
// non-dirty pages can go through demand paging