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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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19
Kernel/FileSystem/OpenFileDescription.cpp
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@ -349,19 +349,18 @@ KResult OpenFileDescription::close()
return m_file->close();
}
KResultOr<NonnullOwnPtr<KString>> OpenFileDescription::try_serialize_absolute_path()
KResultOr<NonnullOwnPtr<KString>> OpenFileDescription::original_absolute_path() const
{
if (!m_custody)
return ENOENT;
return m_custody->try_serialize_absolute_path();
}
KResultOr<NonnullOwnPtr<KString>> OpenFileDescription::pseudo_path() const
{
if (m_custody)
return m_custody->try_serialize_absolute_path();
// FIXME: Don't go through a String here!
return KString::try_create(m_file->absolute_path(*this));
}
String OpenFileDescription::absolute_path() const
{
if (m_custody)
return m_custody->absolute_path();
return m_file->absolute_path(*this);
return m_file->pseudo_path(*this);
}
InodeMetadata OpenFileDescription::metadata() const