RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 19:58:11 +00:00
Code Issues Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

3
Kernel/FileSystem/File.h
View file

@ -93,7 +93,8 @@ public:
virtual KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared);
virtual KResult stat(::stat&) const { return EBADF; }
virtual String absolute_path(const OpenFileDescription&) const = 0;
// Although this might be better described "name" or "description", these terms already have other meanings.
virtual KResultOr<NonnullOwnPtr<KString>> pseudo_path(const OpenFileDescription&) const = 0;
virtual KResult truncate(u64) { return EINVAL; }
virtual KResult sync() { return EINVAL; }