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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 02:39:19 +03:00
parent eb7922ab88
commit f1369c8fd6
18 changed files with 167 additions and 61 deletions
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20
kernel/kernel/Device/FramebufferDevice.cpp
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@@ -241,9 +241,9 @@ namespace Kernel
class FramebufferMemoryRegion : public MemoryRegion
{
public:
static BAN::ErrorOr<BAN::UniqPtr<FramebufferMemoryRegion>> create(PageTable& page_table, size_t size, AddressRange address_range, MemoryRegion::Type region_type, PageTable::flags_t page_flags, BAN::RefPtr<FramebufferDevice> framebuffer)
static BAN::ErrorOr<BAN::UniqPtr<FramebufferMemoryRegion>> create(PageTable& page_table, size_t size, AddressRange address_range, MemoryRegion::Type region_type, PageTable::flags_t page_flags, int status_flags, BAN::RefPtr<FramebufferDevice> framebuffer)
{
auto* region_ptr = new FramebufferMemoryRegion(page_table, size, region_type, page_flags, framebuffer);
auto* region_ptr = new FramebufferMemoryRegion(page_table, size, region_type, page_flags, status_flags, framebuffer);
if (region_ptr == nullptr)
return BAN::Error::from_errno(ENOMEM);
auto region = BAN::UniqPtr<FramebufferMemoryRegion>::adopt(region_ptr);
@@ -258,7 +258,7 @@ namespace Kernel
m_framebuffer->sync_pixels_full();
}
virtual BAN::ErrorOr<void> msync(vaddr_t vaddr, size_t size, int flags) override
BAN::ErrorOr<void> msync(vaddr_t vaddr, size_t size, int flags) override
{
if (flags != MS_SYNC)
return BAN::Error::from_errno(ENOTSUP);
@@ -281,9 +281,9 @@ namespace Kernel
return {};
}
virtual BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> clone(PageTable& new_page_table) override
BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> clone(PageTable& new_page_table) override
{
auto* region_ptr = new FramebufferMemoryRegion(new_page_table, m_size, m_type, m_flags, m_framebuffer);
auto* region_ptr = new FramebufferMemoryRegion(new_page_table, m_size, m_type, m_flags, m_status_flags, m_framebuffer);
if (region_ptr == nullptr)
return BAN::Error::from_errno(ENOMEM);
auto region = BAN::UniqPtr<FramebufferMemoryRegion>::adopt(region_ptr);
@@ -297,7 +297,7 @@ namespace Kernel
// Returns error if no memory was available
// Returns true if page was succesfully allocated
// Returns false if page was already allocated
virtual BAN::ErrorOr<bool> allocate_page_containing_impl(vaddr_t vaddr, bool wants_write) override
BAN::ErrorOr<bool> allocate_page_containing_impl(vaddr_t vaddr, bool wants_write) override
{
(void)wants_write;
@@ -312,8 +312,8 @@ namespace Kernel
}
private:
FramebufferMemoryRegion(PageTable& page_table, size_t size, MemoryRegion::Type region_type, PageTable::flags_t page_flags, BAN::RefPtr<FramebufferDevice> framebuffer)
: MemoryRegion(page_table, size, region_type, page_flags)
FramebufferMemoryRegion(PageTable& page_table, size_t size, MemoryRegion::Type region_type, PageTable::flags_t page_flags, int status_flags, BAN::RefPtr<FramebufferDevice> framebuffer)
: MemoryRegion(page_table, size, region_type, page_flags, status_flags)
, m_framebuffer(framebuffer)
{ }
@@ -370,7 +370,7 @@ namespace Kernel
BAN::RefPtr<FramebufferDevice> m_framebuffer;
};
BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> FramebufferDevice::mmap_region(PageTable& page_table, off_t offset, size_t len, AddressRange address_range, MemoryRegion::Type region_type, PageTable::flags_t page_flags)
BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> FramebufferDevice::mmap_region(PageTable& page_table, off_t offset, size_t len, AddressRange address_range, MemoryRegion::Type region_type, PageTable::flags_t page_flags, int status_flags)
{
if (offset != 0)
return BAN::Error::from_errno(EINVAL);
@@ -379,7 +379,7 @@ namespace Kernel
if (region_type != MemoryRegion::Type::SHARED)
return BAN::Error::from_errno(EINVAL);
auto region = TRY(FramebufferMemoryRegion::create(page_table, len, address_range, region_type, page_flags, this));
auto region = TRY(FramebufferMemoryRegion::create(page_table, len, address_range, region_type, page_flags, status_flags, this));
return BAN::UniqPtr<MemoryRegion>(BAN::move(region));
}