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Kernel: Clarify ambiguous {File,Description}::absolute_path

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Found due to smelly code in InodeFile::absolute_path.

In particular, this replaces the following misleading methods:

File::absolute_path
This method *never* returns an actual path, and if called on an
InodeFile (which is impossible), it would VERIFY_NOT_REACHED().

OpenFileDescription::try_serialize_absolute_path
OpenFileDescription::absolute_path
These methods do not guarantee to return an actual path (just like the
other method), and just like Custody::absolute_path they do not
guarantee accuracy. In particular, just renaming the method made a
TOCTOU bug obvious.

The new method signatures use KResultOr, just like
try_serialize_absolute_path() already did.
This commit is contained in:
Ben Wiederhake 2021-10-30 00:45:23 +02:00 • committed by Andreas Kling
parent 88ca12f037
commit c05c5a7ff4
28 changed files with 83 additions and 65 deletions
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2
Kernel/FileSystem/AnonymousFile.h
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@ -24,7 +24,7 @@ public:
private:
virtual StringView class_name() const override { return "AnonymousFile"sv; }
virtual String absolute_path(const OpenFileDescription&) const override { return ":anonymous-file:"; }
virtual KResultOr<NonnullOwnPtr<KString>> pseudo_path(const OpenFileDescription&) const;
virtual bool can_read(const OpenFileDescription&, size_t) const override { return false; }
virtual bool can_write(const OpenFileDescription&, size_t) const override { return false; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return ENOTSUP; }