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Kernel: Move m_uid and m_gid from the Device class to SlavePTY

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No other device needs to store the UID/GID of the process that created
them, so only store these values within the SlavePTY class.
This commit is contained in:
Liav A 2023-08-30 20:54:04 +03:00 committed by Andrew Kaster
parent 8d81b08f6d
commit ed315dd950
Notes: sideshowbarker 2024-07-17 07:20:57 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/ed315dd950
Pull-request: https://github.com/SerenityOS/serenity/pull/20855
5 changed files with 16 additions and 23 deletions
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7
Kernel/Devices/Device.h
View file

@ -45,9 +45,6 @@ public:
virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const&) const override;
virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
UserID uid() const { return m_uid; }
GroupID gid() const { return m_gid; }
virtual bool is_device() const override { return true; }
virtual void will_be_destroyed() override;
virtual ErrorOr<void> after_inserting();
@ -68,8 +65,6 @@ public:
protected:
Device(MajorNumber major, MinorNumber minor);
void set_uid(UserID uid) { m_uid = uid; }
void set_gid(GroupID gid) { m_gid = gid; }
void after_inserting_add_to_device_management();
void before_will_be_destroyed_remove_from_device_management();
@ -85,8 +80,6 @@ protected:
private:
MajorNumber const m_major { 0 };
MinorNumber const m_minor { 0 };
UserID m_uid { 0 };
GroupID m_gid { 0 };
State m_state { State::Normal };

7
Kernel/FileSystem/DevPtsFS/FileSystem.cpp
View file

@ -53,11 +53,12 @@ ErrorOr<NonnullRefPtr<Inode>> DevPtsFS::get_inode(InodeIdentifier inode_id) cons
auto* device = DeviceManagement::the().get_device(201, pty_index);
VERIFY(device);
auto inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index(), static_cast<SlavePTY*>(device))));
auto* pts_device = static_cast<SlavePTY*>(device);
auto inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index(), pts_device)));
inode->m_metadata.inode = inode_id;
inode->m_metadata.size = 0;
inode->m_metadata.uid = device->uid();
inode->m_metadata.gid = device->gid();
inode->m_metadata.uid = pts_device->uid();
inode->m_metadata.gid = pts_device->gid();
inode->m_metadata.mode = 0020600;
inode->m_metadata.major_device = device->major();
inode->m_metadata.minor_device = device->minor();

8
Kernel/TTY/MasterPTY.cpp
View file

@ -20,7 +20,8 @@ ErrorOr<NonnullLockRefPtr<MasterPTY>> MasterPTY::try_create(unsigned int index)
{
auto buffer = TRY(DoubleBuffer::try_create("MasterPTY: Buffer"sv));
auto master_pty = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) MasterPTY(index, move(buffer))));
auto slave_pty = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) SlavePTY(*master_pty, index)));
auto credentials = Process::current().credentials();
auto slave_pty = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) SlavePTY(*master_pty, credentials->uid(), credentials->gid(), index)));
master_pty->m_slave = slave_pty;
TRY(master_pty->after_inserting());
TRY(slave_pty->after_inserting());
@ -32,11 +33,6 @@ MasterPTY::MasterPTY(unsigned index, NonnullOwnPtr<DoubleBuffer> buffer)
, m_index(index)
, m_buffer(move(buffer))
{
auto& process = Process::current();
auto credentials = process.credentials();
set_uid(credentials->uid());
set_gid(credentials->gid());
m_buffer->set_unblock_callback([this]() {
if (m_slave)
evaluate_block_conditions();

9
Kernel/TTY/SlavePTY.cpp
View file

@ -35,17 +35,14 @@ bool SlavePTY::unref() const
return did_hit_zero;
}
SlavePTY::SlavePTY(NonnullRefPtr<MasterPTY> master, unsigned index)
SlavePTY::SlavePTY(NonnullRefPtr<MasterPTY> master, UserID uid, GroupID gid, unsigned index)
: TTY(201, index)
, m_master(move(master))
, m_index(index)
, m_uid(uid)
, m_gid(gid)
{
auto& process = Process::current();
auto credentials = process.credentials();
set_uid(credentials->uid());
set_gid(credentials->gid());
set_size(80, 25);
SlavePTY::all_instances().with([&](auto& list) { list.append(*this); });
}

8
Kernel/TTY/SlavePTY.h
View file

@ -25,6 +25,9 @@ public:
virtual FileBlockerSet& blocker_set() override;
UserID uid() const { return m_uid; }
GroupID gid() const { return m_gid; }
private:
// ^Device
virtual bool is_openable_by_jailed_processes() const override { return true; }
@ -42,12 +45,15 @@ private:
virtual ErrorOr<void> close() override;
friend class MasterPTY;
SlavePTY(NonnullRefPtr<MasterPTY>, unsigned index);
SlavePTY(NonnullRefPtr<MasterPTY>, UserID, GroupID, unsigned index);
NonnullRefPtr<MasterPTY> const m_master;
UnixDateTime m_time_of_last_write {};
unsigned m_index { 0 };
UserID const m_uid { 0 };
GroupID const m_gid { 0 };
mutable IntrusiveListNode<SlavePTY> m_list_node;
public: