This was a bug that existed during development of this branch; make sure
it doesn't come back.
This test fails with a use-after-free and crash if we comment out the
part of name_watcher_unref_watched_name() that removes the name watcher
from `map_method_serial_to_name_watcher`.
It would also fail with an assertion failure if we asserted in
name_watcher_unref_watched_name() that get_name_owner_serial == 0
(i.e. that GetNameOwner is not in-flight at destruction).
Signed-off-by: Simon McVittie <smcv@collabora.com>
The vulnerability reported as GNOME/glib#3268 can be characterized
as: these signals from an attacker should not be delivered to either
the GDBusConnection or the GDBusProxy, but in fact they are (in at
least some scenarios).
Reproduces: https://gitlab.gnome.org/GNOME/glib/-/issues/3268
Signed-off-by: Simon McVittie <smcv@collabora.com>
The expected result is that because TEST_CONN_SERVICE owns
ALREADY_OWNED_NAME but not (yet) OWNED_LATER_NAME, the signal will be
delivered to the subscriber for the former but not the latter.
Before #3268 was fixed, it was incorrectly delivered to both.
Reproduces: https://gitlab.gnome.org/GNOME/glib/-/issues/3268 (partially)
Signed-off-by: Simon McVittie <smcv@collabora.com>
Otherwise a malicious connection on a shared bus, especially the system
bus, could trick GDBus clients into processing signals sent by the
malicious connection as though they had come from the real owner of a
well-known service name.
Resolves: https://gitlab.gnome.org/GNOME/glib/-/issues/3268
Signed-off-by: Simon McVittie <smcv@collabora.com>
We will use this in a subsequent commit to prevent signals from an
impostor from being delivered to a subscriber.
To avoid message reordering leading to misleading situations, this does
not use the existing mechanism for watching bus name ownership, which
delivers the ownership changes to other main-contexts. Instead, it all
happens on the single thread used by the GDBusWorker, so the order in
which messages are received is the order in which they are processed.
Signed-off-by: Simon McVittie <smcv@collabora.com>
This will become confusing when we start tracking the owner of a
well-known-name sender, and it's redundant anyway. Instead, track the
1 bit of data that we actually need: whether it's a well-known name.
Strictly speaking this too is redundant, because it's syntactically
derivable from the sender, but only via extra string operations.
A subsequent commit will add a data structure to keep track of the
owner of a well-known-name sender, at which point this boolean will
be replaced by the presence or absence of that data structure.
Signed-off-by: Simon McVittie <smcv@collabora.com>
No functional change, just removing some nesting. The check for whether
signal_data->subscribers is empty changes from a conditional that tests
whether it is into an early-return if it isn't.
A subsequent commit will add additional conditions that make us consider
a SignalData to be still in use and therefore not eligible to be removed.
Signed-off-by: Simon McVittie <smcv@collabora.com>
No functional changes, except that the implicit ownership-transfer
for the rule field becomes explicit (the local variable is set to NULL
afterwards).
Signed-off-by: Simon McVittie <smcv@collabora.com>
Subsequent changes will need to access these data structures from
on_worker_message_received(). No functional change here, only moving
code around.
Signed-off-by: Simon McVittie <smcv@collabora.com>
Using these is a bit more clearly correct than repeating them everywhere.
To avoid excessive diffstat in a branch for a bug fix, I'm not
immediately replacing all existing occurrences of the same literals with
these names.
The names of these constants are chosen to be consistent with libdbus,
despite using somewhat outdated terminology (D-Bus now uses the term
"well-known bus name" for what used to be called a service name,
reserving the word "service" to mean specifically the programs that
have .service files and participate in service activation).
Signed-off-by: Simon McVittie <smcv@collabora.com>
On GNOME/glib#3268 there was some concern about whether this would
allow an attacker to send signals and have them be matched to a
GDBusProxy in this situation, but it seems that was a false alarm.
Signed-off-by: Simon McVittie <smcv@collabora.com>
This somewhat duplicates test_connection_signals(), but is easier to
extend to cover different scenarios.
Each scenario is tested three times: once with lower-level
GDBusConnection APIs, once with the higher-level GDBusProxy (which
cannot implement all of the subscription scenarios, so some message
counts are lower), and once with both (to check that delivery of the
same message to multiple destinations is handled appropriately).
Signed-off-by: Simon McVittie <smcv@collabora.com>
If a connection has two signal subscriptions active for the same signal,
one with arg0 matching and one without, a signal which doesn’t contain
an arg0 value (i.e. `g_dbus_message_get_arg0()` returns `NULL`) will
cause `NULL` to be passed to `strcmp()` when checking for a match
against the signal subscription which *has* arg0 matching, causing a
crash.
Fix that by adding the obvious `NULL` check, and add a unit test.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Fixes: #3342
When piecewise validating the offset table for a variable sized array,
it’s possible that the offset table (`offsets.array`) won’t actually
have been set by `gvs_variable_sized_array_get_frame_offsets()` iff the
serialised `GVariant` is not in normal form.
Add an additional check to guard against this. This will result in an
empty child variant being returned, as with other error handling paths
in `gvs_variable_sized_array_get_child()`.
This is a true positive spotted by scan-build. Thanks, scan-build.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: #1767
I’m not sure exactly how this code is supposed to work, so this might
not be the right fix. But there’s definitely a problem here, and it was
spotted by scan-build.
If `param_value_array_validate()` is entered with
`value->data[0].v_pointer == NULL && aspec->fixed_n_elements`, that `NULL`
will be stored in `value_array` too. `value->data[0].v_pointer` will
then be set to a new non-`NULL` array.
A few lines down, `value_array_ensure_size()` is called on
`value_array` – which is still `NULL` – and this results in a `NULL`
pointer dereference.
It looks like `value->data[0].v_pointer` and `value_array` are used
interchangeably throughout the whole of the function, so assign the new
value of `value->data[0].v_pointer` to `value_array` too.
My guess is that `value_array` is just a convenience alias for
`value->data[0].v_pointer`, because the latter is a real mouthful to
type or read.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: #1767
Spotted by scan-build, an actual true positive result from it, and a
fiendish one too.
If any of the calls to `dupfd_cloexec()` (except the final one) fail,
the remainder of the `duped_source_fds` array would have been left
uninitialised.
The code in `out_close_fds` would have then called `g_clear_fd()` on an
uninitialised FD, with unpredictable results.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: #1767
Rather than `strdup()`ing strings when passing them into
`_xdg_glob_list_append()`, `strdup()` them *inside* the function
instead.
This avoids a leak in the case that the list entry (tuple of `data` and
`mime_type`) already exists in the list.
This has been upstreamed as
https://gitlab.freedesktop.org/xdg/xdgmime/-/merge_requests/36.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
There were a couple of functions in `GDBusConnection` which take a
`user_data` argument, but which then leak it if they error out early.
A true positive spotted by scan-build!
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: #1767
scan-build thinks that the `atypes` array is leaked, but it’s not.
Ownership is transferred into the `ffi_cif` structure, and it’s
eventually freed in `gi_callable_info_destroy_closure()`.
Try and help the static analysis by adding an explicit ownership
transfer annotation. It probably won’t help.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: #1767
There were some error paths where it wasn’t set, returning an
uninitialised value to the caller.
Spotted by scan-build.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: #1767
The recently added libmount-based unix mount monitoring may fail when the
device exceeds inotify limits. Let's fallback to the older implementation
in case of the `mnt_monitor_get_fd` function failure. This among others
fixes tracker-miners failures caused by seccomp rules.
Fixes: https://gitlab.gnome.org/GNOME/tracker-miners/-/issues/315
With the shell in nounset mode, an error is emitted on referencing
`schemadir` as it is not initialized in all code paths.
Initialize to an empty string to fix.
Signed-off-by: Ville Skyttä <ville.skytta@iki.fi>
This fixes an issue with the number getting very big due to
CPU_ISSET not returning exactly 0 or 1.
This also fixes scenarios where there are holes in the CPU
set. E.g. for a simple run like `taskset --cpu-list 1,2,4 ...`
the old code would return 2 instead of 3, due to iterating
until `ncores` (which is 3) and therefore not accounting for
CPUs further in the set.
Ref https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3784
(cherry picked from commit cc25486b23)
This was erroring on recent GCC because `struct heap_dict` is smaller than
the publicly provided size (guintptr[16]) in the header for GVariantDict.
Port to use `g_malloc()` directly, and use a static assertion to ensure
we’re allocating the larger of the two struct sizes.
These consistently fail on scheduled CI runs, which is not helping our
ability to catch Hurd regressions.
For example, https://gitlab.gnome.org/GNOME/glib/-/jobs/3709402
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
See: #3148
