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Kernel: Ignore dirfd if absolute path is given in VFS-related syscalls

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To be able to do this, we add a new class called CustodyBase, which can
be resolved on-demand internally in the VirtualFileSystem resolving path
code.

When being resolved, CustodyBase will return a known custody if it was
constructed with such, if that's not the case it will provide the root
custody if the original path is absolute.
Lastly, if that's not the case as well, it will resolve the given dirfd
to provide a Custody object.
This commit is contained in:
Liav A.
2024-05-24 05:08:28 +03:00
committed by Tim Schumacher
parent 1e4a78ee04
commit ecc9c5409d
23 changed files with 157 additions and 71 deletions
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37
Kernel/FileSystem/VirtualFileSystem.h
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@@ -12,6 +12,7 @@
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/RefPtr.h>
#include <Kernel/FileSystem/CustodyBase.h>
#include <Kernel/FileSystem/FileBackedFileSystem.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Initializer.h>
@@ -64,27 +65,27 @@ public:
ErrorOr<void> unmount(Custody& mount_point);
ErrorOr<void> unmount(Inode& guest_inode, StringView custody_path);
ErrorOr<NonnullRefPtr<OpenFileDescription>> open(Credentials const&, StringView path, int options, mode_t mode, Custody& base, Optional<UidAndGid> = {});
ErrorOr<NonnullRefPtr<OpenFileDescription>> open(Process const&, Credentials const&, StringView path, int options, mode_t mode, Custody& base, Optional<UidAndGid> = {});
ErrorOr<NonnullRefPtr<OpenFileDescription>> open(Credentials const&, StringView path, int options, mode_t mode, CustodyBase const& base, Optional<UidAndGid> = {});
ErrorOr<NonnullRefPtr<OpenFileDescription>> open(Process const&, Credentials const&, StringView path, int options, mode_t mode, CustodyBase const& base, Optional<UidAndGid> = {});
ErrorOr<NonnullRefPtr<OpenFileDescription>> create(Credentials const&, StringView path, int options, mode_t mode, Custody& parent_custody, Optional<UidAndGid> = {});
ErrorOr<NonnullRefPtr<OpenFileDescription>> create(Process const&, Credentials const&, StringView path, int options, mode_t mode, Custody& parent_custody, Optional<UidAndGid> = {});
ErrorOr<void> mkdir(Credentials const&, StringView path, mode_t mode, Custody& base);
ErrorOr<void> link(Credentials const&, StringView old_path, StringView new_path, Custody& base);
ErrorOr<void> unlink(Credentials const&, StringView path, Custody& base);
ErrorOr<void> symlink(Credentials const&, StringView target, StringView linkpath, Custody& base);
ErrorOr<void> rmdir(Credentials const&, StringView path, Custody& base);
ErrorOr<void> chmod(Credentials const&, StringView path, mode_t, Custody& base, int options = 0);
ErrorOr<void> mkdir(Credentials const&, StringView path, mode_t mode, CustodyBase const& base);
ErrorOr<void> link(Credentials const&, StringView old_path, StringView new_path, CustodyBase const& base);
ErrorOr<void> unlink(Credentials const&, StringView path, CustodyBase const& base);
ErrorOr<void> symlink(Credentials const&, StringView target, StringView linkpath, CustodyBase const& base);
ErrorOr<void> rmdir(Credentials const&, StringView path, CustodyBase const& base);
ErrorOr<void> chmod(Credentials const&, StringView path, mode_t, CustodyBase const& base, int options = 0);
ErrorOr<void> chmod(Credentials const&, Custody&, mode_t);
ErrorOr<void> chown(Credentials const&, StringView path, UserID, GroupID, Custody& base, int options);
ErrorOr<void> chown(Credentials const&, StringView path, UserID, GroupID, CustodyBase const& base, int options);
ErrorOr<void> chown(Credentials const&, Custody&, UserID, GroupID);
ErrorOr<void> access(Credentials const&, StringView path, int mode, Custody& base, AccessFlags);
ErrorOr<InodeMetadata> lookup_metadata(Credentials const&, StringView path, Custody& base, int options = 0);
ErrorOr<void> utime(Credentials const&, StringView path, Custody& base, time_t atime, time_t mtime);
ErrorOr<void> utimensat(Credentials const&, StringView path, Custody& base, timespec const& atime, timespec const& mtime, int options = 0);
ErrorOr<void> access(Credentials const&, StringView path, int mode, CustodyBase const& base, AccessFlags);
ErrorOr<InodeMetadata> lookup_metadata(Credentials const&, StringView path, CustodyBase const& base, int options = 0);
ErrorOr<void> utime(Credentials const&, StringView path, CustodyBase const& base, time_t atime, time_t mtime);
ErrorOr<void> utimensat(Credentials const&, StringView path, CustodyBase const& base, timespec const& atime, timespec const& mtime, int options = 0);
ErrorOr<void> do_utimens(Credentials const& credentials, Custody& custody, timespec const& atime, timespec const& mtime);
ErrorOr<void> rename(Credentials const&, Custody& old_base, StringView oldpath, Custody& new_base, StringView newpath);
ErrorOr<void> mknod(Credentials const&, StringView path, mode_t, dev_t, Custody& base);
ErrorOr<NonnullRefPtr<Custody>> open_directory(Credentials const&, StringView path, Custody& base);
ErrorOr<void> rename(Credentials const&, CustodyBase const& old_base, StringView oldpath, CustodyBase const& new_base, StringView newpath);
ErrorOr<void> mknod(Credentials const&, StringView path, mode_t, dev_t, CustodyBase const& base);
ErrorOr<NonnullRefPtr<Custody>> open_directory(Credentials const&, StringView path, CustodyBase const& base);
ErrorOr<void> for_each_mount(Function<ErrorOr<void>(Mount const&)>) const;
@@ -94,8 +95,8 @@ public:
static void sync();
NonnullRefPtr<Custody> root_custody();
ErrorOr<NonnullRefPtr<Custody>> resolve_path(Credentials const&, StringView path, NonnullRefPtr<Custody> base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
ErrorOr<NonnullRefPtr<Custody>> resolve_path(Process const&, Credentials const&, StringView path, NonnullRefPtr<Custody> base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
ErrorOr<NonnullRefPtr<Custody>> resolve_path(Credentials const&, StringView path, CustodyBase const& base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
ErrorOr<NonnullRefPtr<Custody>> resolve_path(Process const&, Credentials const&, StringView path, CustodyBase const& base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
ErrorOr<NonnullRefPtr<Custody>> resolve_path_without_veil(Credentials const&, StringView path, NonnullRefPtr<Custody> base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
private: