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Kernel: Use KResultOr and TRY() for {Shared,Private}InodeVMObject

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This commit is contained in:
Andreas Kling 2021-09-06 12:58:03 +02:00
parent e3a716ceff
commit 6e3381ac32
Notes: sideshowbarker 2024-07-18 04:38:32 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/6e3381ac32e
8 changed files with 14 additions and 31 deletions
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6
Kernel/FileSystem/InodeFile.cpp
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@ -86,11 +86,9 @@ KResultOr<Memory::Region*> InodeFile::mmap(Process& process, FileDescription& de
// FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
RefPtr<Memory::InodeVMObject> vmobject;
if (shared)
vmobject = Memory::SharedInodeVMObject::try_create_with_inode(inode());
vmobject = TRY(Memory::SharedInodeVMObject::try_create_with_inode(inode()));
else
vmobject = Memory::PrivateInodeVMObject::try_create_with_inode(inode());
if (!vmobject)
return ENOMEM;
vmobject = TRY(Memory::PrivateInodeVMObject::try_create_with_inode(inode()));
return process.address_space().allocate_region_with_vmobject(range, vmobject.release_nonnull(), offset, description.absolute_path(), prot, shared);
}

4
Kernel/Memory/PrivateInodeVMObject.cpp
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@ -9,9 +9,9 @@
namespace Kernel::Memory {
RefPtr<PrivateInodeVMObject> PrivateInodeVMObject::try_create_with_inode(Inode& inode)
KResultOr<NonnullRefPtr<PrivateInodeVMObject>> PrivateInodeVMObject::try_create_with_inode(Inode& inode)
{
return adopt_ref_if_nonnull(new (nothrow) PrivateInodeVMObject(inode, inode.size()));
return adopt_nonnull_ref_or_enomem(new (nothrow) PrivateInodeVMObject(inode, inode.size()));
}
KResultOr<NonnullRefPtr<VMObject>> PrivateInodeVMObject::try_clone()

2
Kernel/Memory/PrivateInodeVMObject.h
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@ -18,7 +18,7 @@ class PrivateInodeVMObject final : public InodeVMObject {
public:
virtual ~PrivateInodeVMObject() override;
static RefPtr<PrivateInodeVMObject> try_create_with_inode(Inode&);
static KResultOr<NonnullRefPtr<PrivateInodeVMObject>> try_create_with_inode(Inode&);
virtual KResultOr<NonnullRefPtr<VMObject>> try_clone() override;
private:

6
Kernel/Memory/SharedInodeVMObject.cpp
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@ -9,14 +9,12 @@
namespace Kernel::Memory {
RefPtr<SharedInodeVMObject> SharedInodeVMObject::try_create_with_inode(Inode& inode)
KResultOr<NonnullRefPtr<SharedInodeVMObject>> SharedInodeVMObject::try_create_with_inode(Inode& inode)
{
size_t size = inode.size();
if (auto shared_vmobject = inode.shared_vmobject())
return shared_vmobject.release_nonnull();
auto vmobject = adopt_ref_if_nonnull(new (nothrow) SharedInodeVMObject(inode, size));
if (!vmobject)
return nullptr;
auto vmobject = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) SharedInodeVMObject(inode, size)));
vmobject->inode().set_shared_vmobject(*vmobject);
return vmobject;
}

2
Kernel/Memory/SharedInodeVMObject.h
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@ -16,7 +16,7 @@ class SharedInodeVMObject final : public InodeVMObject {
AK_MAKE_NONMOVABLE(SharedInodeVMObject);
public:
static RefPtr<SharedInodeVMObject> try_create_with_inode(Inode&);
static KResultOr<NonnullRefPtr<SharedInodeVMObject>> try_create_with_inode(Inode&);
virtual KResultOr<NonnullRefPtr<VMObject>> try_clone() override;
private:

12
Kernel/Syscalls/execve.cpp
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@ -165,11 +165,7 @@ struct RequiredLoadRange {
static KResultOr<RequiredLoadRange> get_required_load_range(FileDescription& program_description)
{
auto& inode = *(program_description.inode());
auto vmobject = Memory::SharedInodeVMObject::try_create_with_inode(inode);
if (!vmobject) {
dbgln("get_required_load_range: Unable to allocate SharedInodeVMObject");
return ENOMEM;
}
auto vmobject = TRY(Memory::SharedInodeVMObject::try_create_with_inode(inode));
size_t executable_size = inode.size();
@ -265,11 +261,7 @@ static KResultOr<LoadResult> load_elf_object(NonnullOwnPtr<Memory::AddressSpace>
FlatPtr load_offset, ShouldAllocateTls should_allocate_tls, ShouldAllowSyscalls should_allow_syscalls)
{
auto& inode = *(object_description.inode());
auto vmobject = Memory::SharedInodeVMObject::try_create_with_inode(inode);
if (!vmobject) {
dbgln("load_elf_object: Unable to allocate SharedInodeVMObject");
return ENOMEM;
}
auto vmobject = TRY(Memory::SharedInodeVMObject::try_create_with_inode(inode));
if (vmobject->writable_mappings()) {
dbgln("Refusing to execute a write-mapped program");

7
Kernel/Syscalls/mmap.cpp
View File

@ -497,17 +497,14 @@ KResultOr<FlatPtr> Process::sys$mremap(Userspace<const Syscall::SC_mremap_params
auto old_offset = old_region->offset_in_vmobject();
NonnullRefPtr inode = static_cast<Memory::SharedInodeVMObject&>(old_region->vmobject()).inode();
auto new_vmobject = Memory::PrivateInodeVMObject::try_create_with_inode(inode);
if (!new_vmobject)
return ENOMEM;
auto new_vmobject = TRY(Memory::PrivateInodeVMObject::try_create_with_inode(inode));
auto old_name = old_region->take_name();
// Unmap without deallocating the VM range since we're going to reuse it.
old_region->unmap(Memory::Region::ShouldDeallocateVirtualRange::No);
address_space().deallocate_region(*old_region);
auto new_region = TRY(address_space().allocate_region_with_vmobject(range, new_vmobject.release_nonnull(), old_offset, old_name->view(), old_prot, false));
auto new_region = TRY(address_space().allocate_region_with_vmobject(range, move(new_vmobject), old_offset, old_name->view(), old_prot, false));
new_region->set_mmap(true);
return new_region->vaddr().get();
}

6
Kernel/Syscalls/ptrace.cpp
View File

@ -185,10 +185,8 @@ KResult Process::poke_user_data(Userspace<u32*> address, u32 data)
// If the region is shared, we change its vmobject to a PrivateInodeVMObject
// to prevent the write operation from changing any shared inode data
VERIFY(region->vmobject().is_shared_inode());
auto vmobject = Memory::PrivateInodeVMObject::try_create_with_inode(static_cast<Memory::SharedInodeVMObject&>(region->vmobject()).inode());
if (!vmobject)
return ENOMEM;
region->set_vmobject(vmobject.release_nonnull());
auto vmobject = TRY(Memory::PrivateInodeVMObject::try_create_with_inode(static_cast<Memory::SharedInodeVMObject&>(region->vmobject()).inode()));
region->set_vmobject(move(vmobject));
region->set_shared(false);
}
const bool was_writable = region->is_writable();