This includes a new Thread::Blocker called SignalBlocker which blocks
until a signal of a matching type is pending. The current Blocker
implementation in the Kernel is very complicated, but cleaning it up is
a different yak for a different day.
As required by posix. Also rename Thread::clear_signals to
Thread::reset_signals_for_exec since it doesn't actually clear any
pending signals, but rather does execve related signal book-keeping.
This option is already enabled when building Lagom, so let's enable it
for the main build too. We will no longer be surprised by Lagom Clang
CI builds failing while everything compiles locally.
Furthermore, the stronger `-Wsuggest-override` warning is enabled in
this commit, which enforces the use of the `override` keyword in all
classes, not just those which already have some methods marked as
`override`. This works with both GCC and Clang.
It's not enough to just find the largest-address-not-above the argument,
we must also check that the found region actually contains the argument.
Regressed in a23edd42b8, thanks to Idan
for pointing this out.
Most of the time, we will be freeing physical pages within the
full-sized zones. We can do some simple math to find the right zone
immediately instead of looping through the zones, checking each one.
We still do loop through the slack/remainder zones at the end.
There's probably an even nicer way to solve this, but this is already a
nice improvement. :^)
We were already doing this for userspace memory regions (in the
Memory::AddressSpace class), so let's do it for kernel regions as well.
This gives a nice speed-up on test-js and probably basically everything
else as well. :^)
There is no use to create a temporary String of a char const* to just
cast it to a StringView on SysFSComponent construction again.
Also this could have lead to a UAF bug.
If we're sending an urgent signal (i.e. due to unexpected conditions)
and the Process did not setup any signal handler, we should immediately
terminate the Thread, to ensure the current trap frame is preserved for
the impending core dump.
Returning 'result.error().code()' erroneously creates an
ErrorOr<FlatPtr> of the positive errno code, which breaks our
error-returning convention.
This seems to be due to a forgotten minus-sign during the refactoring in
9e51e295cf. This latent bug was never
discovered, because currently the error-handling paths are rarely
exercised.
Also, remove incomplete, superfluous check.
Incomplete, because only the byte at the provided address was checked;
this misses the last bytes of the "jerk page".
Superfluous, because it is already correctly checked by peek_user_data
(which calls copy_from_user).
The caller/tracer should not typically attempt to read non-userspace
addresses, we don't need to "hot-path" it either.
Creating pointers from arbitrary values is not a valid thing to do in
constexpr functions. Furthermore, this functions is always called with
runtime values anyways, so there's no use in having it be constexpr.
Instead, make it ALWAYS_INLINE.
