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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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28
Kernel/Graphics/FramebufferDevice.cpp
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@ -36,14 +36,15 @@ ErrorOr<Memory::Region*> FramebufferDevice::mmap(Process& process, OpenFileDescr
if (offset != 0)
return ENXIO;
auto framebuffer_length = TRY(buffer_length(0));
if (range.size() != Memory::page_round_up(framebuffer_length))
framebuffer_length = TRY(Memory::page_round_up(framebuffer_length));
if (range.size() != framebuffer_length)
return EOVERFLOW;
m_userspace_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, Memory::page_round_up(framebuffer_length)));
m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, Memory::page_round_up(framebuffer_length)));
m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(Memory::page_round_up(framebuffer_length), AllocationStrategy::AllocateNow));
m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, Memory::page_round_up(framebuffer_length), "Framebuffer", Memory::Region::Access::ReadWrite));
m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, Memory::page_round_up(framebuffer_length), "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
m_userspace_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, framebuffer_length));
m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, framebuffer_length));
m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(framebuffer_length, AllocationStrategy::AllocateNow));
m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, framebuffer_length, "Framebuffer", Memory::Region::Access::ReadWrite));
m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, framebuffer_length, "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
RefPtr<Memory::VMObject> chosen_vmobject;
if (m_graphical_writes_enabled) {
@ -68,7 +69,8 @@ void FramebufferDevice::deactivate_writes()
return;
auto framebuffer_length_or_error = buffer_length(0);
VERIFY(!framebuffer_length_or_error.is_error());
memcpy(m_swapped_framebuffer_region->vaddr().as_ptr(), m_real_framebuffer_region->vaddr().as_ptr(), Memory::page_round_up(framebuffer_length_or_error.release_value()));
size_t rounded_framebuffer_length = Memory::page_round_up(framebuffer_length_or_error.release_value()).release_value_but_fixme_should_propagate_errors();
memcpy(m_swapped_framebuffer_region->vaddr().as_ptr(), m_real_framebuffer_region->vaddr().as_ptr(), rounded_framebuffer_length);
auto vmobject = m_swapped_framebuffer_vmobject;
m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
m_userspace_framebuffer_region->remap();
@ -85,7 +87,8 @@ void FramebufferDevice::activate_writes()
auto framebuffer_length_or_error = buffer_length(0);
VERIFY(!framebuffer_length_or_error.is_error());
memcpy(m_real_framebuffer_region->vaddr().as_ptr(), m_swapped_framebuffer_region->vaddr().as_ptr(), Memory::page_round_up(framebuffer_length_or_error.release_value()));
size_t rounded_framebuffer_length = Memory::page_round_up(framebuffer_length_or_error.release_value()).release_value_but_fixme_should_propagate_errors();
memcpy(m_real_framebuffer_region->vaddr().as_ptr(), m_swapped_framebuffer_region->vaddr().as_ptr(), rounded_framebuffer_length);
auto vmobject = m_userspace_real_framebuffer_vmobject;
m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
m_userspace_framebuffer_region->remap();
@ -97,10 +100,11 @@ UNMAP_AFTER_INIT ErrorOr<void> FramebufferDevice::try_to_initialize()
// FIXME: Would be nice to be able to unify this with mmap above, but this
// function is UNMAP_AFTER_INIT for the time being.
auto framebuffer_length = TRY(buffer_length(0));
m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, Memory::page_round_up(framebuffer_length)));
m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(Memory::page_round_up(framebuffer_length), AllocationStrategy::AllocateNow));
m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, Memory::page_round_up(framebuffer_length), "Framebuffer", Memory::Region::Access::ReadWrite));
m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, Memory::page_round_up(framebuffer_length), "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
framebuffer_length = TRY(Memory::page_round_up(framebuffer_length));
m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, framebuffer_length));
m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(framebuffer_length, AllocationStrategy::AllocateNow));
m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, framebuffer_length, "Framebuffer", Memory::Region::Access::ReadWrite));
m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, framebuffer_length, "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
return {};
}