These 4 fields were made `Atomic` in
c3f668a758, at which time these were still
accessed unserialized and TOCTOU bugs could happen. Later, in
8ed06ad814, we serialized access to these
fields in a number of helper methods, removing the need for `Atomic`.
Instead of having a single available memory range that encompasses the
whole 0x00000000-0x3EFFFFFF range of physical memory, create a separate
reserved entry for the RAM range used by the VideoCore. This fixes a
crash that happens when we try to allocate physical pages in the GPU's
reserved range.
This will eventually be replaced with parsing the data from the device
tree, but for now, this should solve some of the recurring CI failures.
Like the HID, Audio and Storage subsystem, the Graphics subsystem (which
handles GPUs technically) exposes unix device files (typically in /dev).
To ensure consistency across the repository, move all related files to a
new directory under Kernel/Devices called "GPU".
Also remove the redundant "GPU" word from the VirtIO driver directory,
and the word "Graphics" from GraphicsManagement.{h,cpp} filenames.
The implemented cloning mechanism should be sound:
- If a PartitionTable is passed a File with
ShouldCloseFileDescriptor::Yes, then it will keep it alive until the
PartitionTable is destroyed.
- If a PartitionTable is passed a File with
ShouldCloseFileDescriptor::No, then the caller has to ensure that the
file descriptor remains alive.
If the caller is EBRPartitionTable, the same consideration holds.
If the caller is PartitionEditor::PartitionModel, this is satisfied by
keeping an OwnPtr<Core::File> around which is the originally opened
file.
Therefore, we never leak any fds, and never access a Core::File or fd
after destroying it.
This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow,
UserOrKernelBuffer and ScopedCritical classes being moved to the
Kernel/Library subdirectory.
Also, move the panic and assertions handling code to that directory.
When deleting a directory, the rmdir syscall should fail if the path was
unveiled without the 'c' permission. This matches the same behavior that
OpenBSD enforces when doing this kind of operation.
When deleting a file, the unlink syscall should fail if the path was
unveiled without the 'w' permission, to ensure that userspace is aware
of the possibility of removing a file only when the path was unveiled as
writable.
When using the userdel utility, we now unveil that directory path with
the unveil 'c' permission so removal of an account home directory is
done properly.
The Storage subsystem, like the Audio and HID subsystems, exposes Unix
device files (for example, in the /dev directory). To ensure consistency
across the repository, we should make the Storage subsystem to reside in
the Kernel/Devices directory like the two other mentioned subsystems.
This is enforced by the hardware and an exception is generated when the
stack pointer is not properly aligned. This brings us closer to booting
the aarch64 Kernel on baremetal.
This is the only kernel issue blocking us from running the test suite.
Having userspace backtraces printed to the debug console during crashes
isn't vital to the system's function, so let's just return an empty
trace and print a FIXME instead of crashing.
After examination of all overriden Inode::traverse_as_directory methods
it seems like proper locking is already existing everywhere, so there's
no need to take the big process lock anymore, as there's no access to
shared process structures anyway.
The contents of the directory inode could change if we are not taking so
we must take the m_inode_lock to prevent corruption when reading the
directory contents.
This is not needed, because when we are doing this traversing, functions
that are called from this function are using proper and more "atomic"
locking.
"Wherever applicable" = most places, actually :^), especially for
networking and filesystem timestamps.
This includes changes to unzip, which uses DOSPackedTime, since that is
changed for the FAT file systems.
That's what this class really is; in fact that's what the first line of
the comment says it is.
This commit does not rename the main files, since those will contain
other time-related classes in a little bit.
Add a helper initialize_interrupt_queue() helper to enable_irq instead
of doing it as part of its object construction as it can fail. This is
similar to how AHCI initializes its interrupt as well.
NVMe{Poll|Interrupt}Queue don't have a try_create() method. Add one to
keep it consistent with how we create objects. Also this commit is in
preparation to moving any initialization related code out of the
constructor.
This commit lets us differentiate whether access faults are caused by
accessing junk memory addresses given to us by userspace or if we hit a
kernel bug.
The stub implementations of the `safe_*` functions currently don't let
us jump back into them and return a value indicating failure, so we
panic if such a fault happens. Practically, this means that we still
crash, but if the access violation was caused by something else, we take
the usual kernel crash code path and print a register and memory dump,
rather than hitting the `TODO_AARCH64` in `handle_safe_access_fault`.
These are used in futexes, which are needed if we want to get further in
`run-tests`.
For now, we have no way to return a non-fatal error if an access fault
is raised while executing these, so the kernel will panic. Some would
consider this a DoS vulnerability where a malicious userspace app can
crash the kernel by passing bogus pointers to it, but I prefer to call
it progress :^)
Enabling these will fix the Unsupported Exclusive or Atomic access data
fault we get on bare metal Raspberry Pi 3. On A53/A57 chips (and newer),
atomic compare-exchange operations require the data cache to be enabled.
Referencing ARM DDI 0487J.a, update the names of previously reserved
fields, and set the reset_value() of the SCTLR_EL1 struct to reflect
the defaults we want for this register on reboot.
