This patch brings Kernel::RangeAllocator to UserspaceEmulator in a
slightly simplified form.
It supports the basic three allocation types needed by virt$mmap():
allocate_anywhere, allocate_specific, and allocate_randomized.
Porting virt$mmap() and virt$munmap() to use the allocator makes
UE work correctly once again. :^)
They're really the same thing: a DNS packet can contain both questions and
answers, and there's a single bit in the header that determines whether the
packet represents a query or a response. It'll be simpler for us to represent
both types of packets using the same class.
This class can be both serialized and deserialized to/from a raw DNS packet.
Now that we no longer depend on the textual IPC format, we can pass IP addresses
in the format most code actually has and needs it: in binary. The only places we
actually have to deal with textual address representation is:
* When reading /etc/hosts, we have to parse textual addresses & convert them to
binary;
* When doing reverse lookups, we have to form a pseudo-hostname of the form
x.x.x.x.in-addr.arpa.
So we do the conversion in those two cases.
This also increases uniformity between how we handle A (IPv4 address) and other
resource record types. Namely, we now store the raw binary data as received from
a DNS server.
The ad-hoc IPC we were doing with LookupServer was kinda gross. With this,
LookupServer is a regular IPC server. In the future, we want to add more APIs
for LookupServer to talk to its clients (such as DHCPClient telling LookupServer
about the DNS server discovered via DHCP, and DNS-SD client browsing for
services), which calls for a more expressive IPC format; this is what LibIPC is
perfect for.
While the LookupServer side is using the regular LibIPC mechanics and patterns,
the LibC side has to hand-roll LibIPC format serialization without actually
using LibIPC. We might be able to get rid of this in the future, but for now it
has to be like that. The good news is the format is not that bad at all.
Currently, there is no way to know when in a profile's duration a
sample was taken. This commit adds a basic timestamp to the timeline
widget, and a black bar to show where the cursor is hovering over.
I just ran through successfully building and running SerenityOS under
macOS. I ran into two main things that I struggled with, which were
- properly enabling osxfuse (through System Preferences)
- running the suggested command about compiler versions in such a way
that would be compatible with Ninja (as it turns out, I just needed
to add `-G Ninja` to the command)
This commit clarifies those things for anyone who may follow
We now build the kernel with partial UBSAN support.
The following -fsanitize sub-options are enabled:
* nonnull-attribute
* bool
If the kernel detects UB at runtime, it will now print a debug message
with a stack trace. This is very cool! I'm leaving it on by default for
now, but we'll probably have to re-evaluate this as more options are
enabled and slowdown increases.
This achieves two things:
- Programs can now intentionally perform arbitrary syscalls by calling
syscall(). This allows us to work on things like syscall fuzzing.
- It restricts the ability of userspace to make syscalls to a single
4KB page of code. In order to call the kernel directly, an attacker
must now locate this page and call through it.
I originally wanted to batch the symbolication requests but that just
makes the client logic significantly more complicated with no real
benefit other than architectural feelgood points.
Since this is useful in many places, let's have a common implementation
of walking the stack of a given thread via /proc and symbolicating each
of the frames.
The /boot directory is only accessible to root by default, but anyone
wanting access to kernel symbols for development can get them by making
/boot/Kernel accessible to the "symbol" user.
Usage: bt <PID>
This program will print a symbolicated backtrace for the main thread of
the process with the given PID. It uses SymbolServer for the
symbolication.
There's a lot of room for improvement in this command, but it is pretty
neat already. :^)
This patch adds SymbolServer, a service daemon that provides
symbolication of ELF binaries. It has a very simple IPC API at the
moment that only turns addresses into symbol names.
This can be used to implement symbolication without having to do
in-process ELF parsing yourself. :^)
Leaking macros across headers is a terrible thing, but I can't think of
a better way of achieving this.
- We need some way of modifying debug macros from CMake to implement
ENABLE_ALL_THE_DEBUG_MACROS.
- We need some way of modifying debug macros in specific source files
because otherwise we need to rebuild too many files.
This was done using the following script:
sed -i -E 's/#cmakedefine01 ([A-Z0-9_]+)/#ifndef \1\n\0\n#endif\n/' AK/Debug.h.in
sed -i -E 's/#cmakedefine01 ([A-Z0-9_]+)/#ifndef \1\n\0\n#endif\n/' Kernel/Debug.h.in
Using the text segment for the VM reservation ran into trouble when
there was a discrepancy between the p_filesz and p_memsz.
Simplify this mechanism and avoid trouble by making the reservation
as a MAP_PRIVATE | MAP_NORESERVE throwaway mapping instead.
Fixes#5225.
Document and HTMLElement now inherit from HTML::GlobalEventHandlers
which allows them to support "onfoo" event handler attributes.
These are assignable both via IDL attributes and content attributes.
Event listeners constructed this way get a special "attribute" flag
on them so we know which one to replace if you reassign them.
This also allows them to coexist with EventTarget.addEventListener().
This is all a bit sloppy, but it works decently for a first cut.
The Window object should also inherit GlobalEventHandlers, but since
we don't generate it from IDL, I haven't taken that step here.
Also this would be a lot nicer if we supported IDL mixins.
