RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 20:28:11 +00:00
Code Issues Activity Actions

Everywhere: Prevent risky implicit casts of (Nonnull)RefPtr

Browse source 
Our existing implementation did not check the element type of the other
pointer in the constructors and move assignment operators. This meant
that some operations that would require explicit casting on raw pointers
were done implicitly, such as:
- downcasting a base class to a derived class (e.g. `Kernel::Inode` =>
  `Kernel::ProcFSDirectoryInode` in Kernel/ProcFS.cpp),
- casting to an unrelated type (e.g. `Promise<bool>` => `Promise<Empty>`
  in LibIMAP/Client.cpp)

This, of course, allows gross violations of the type system, and makes
the need to type-check less obvious before downcasting. Luckily, while
adding the `static_ptr_cast`s, only two truly incorrect usages were
found; in the other instances, our casts just needed to be made
explicit.
This commit is contained in:
Daniel Bertalan 2021-09-03 19:11:51 +02:00 • committed by Andreas Kling
parent bad23e3f8c
commit d7b6cc6421
21 changed files with 43 additions and 43 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Kernel/FileSystem/SysFSComponent.h
View file

@ -26,7 +26,7 @@ public:
virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
virtual KResultOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, FileDescription*) { return EROFS; }
virtual NonnullRefPtr<Inode> to_inode(SysFS const&) const;
virtual NonnullRefPtr<SysFSInode> to_inode(SysFS const&) const;
InodeIndex component_index() const { return m_component_index; };
@ -45,7 +45,7 @@ public:
virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
virtual NonnullRefPtr<Inode> to_inode(SysFS const& sysfs_instance) const override final;
virtual NonnullRefPtr<SysFSInode> to_inode(SysFS const& sysfs_instance) const override final;
protected:
explicit SysFSDirectory(StringView name);