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strempty() will return an empty string in case the input parameter is
a NULL pointer. The correct test to check for an empty string is
isempty(), so use that instead.
This fixes a regression from commit 17a1c59 ("core/mount: filter out
noauto,auto,nofail,fail options").
This rule is only run on tablet/touchscreen devices, and extracts their size
in millimeters, as it can be found out through their struct input_absinfo.
The first usecase is exporting device size from tablets/touchscreens. This
may be useful to separate policy and application at the time of mapping
these devices to the available outputs in windowing environments that don't
offer that information as readily (eg. Wayland). This way the compositor can
stay deterministic, and the mix-and-match heuristics are performed outside.
Conceivably, size/resolution information can be changed through EVIOCSABS
anywhere else, but we're only interested in values prior to any calibration,
this rule is thus only run on "add", and no tracking of changes is performed.
This should only remain a problem if calibration were automatically applied
by an earlier udev rule (read: don't).
v2: Folded rationale into commit log, made a builtin, set properties
on device nodes themselves
v3: Use inline function instead of macro for mm. size calculation,
use DECIMAL_STR_MAX, other code style issues
v4: Made rule more selective
v5: Minor style issues, renamed to a more generic builtin, refined
rule further.
cunescape_length_with_prefix() is called with the length as an
argument, so it cannot rely on the buffer being NUL terminated.
Move the length check before accessing the memory.
When an incomplete escape sequence was given at the end of the
buffer, c_l_w_p() would read past the end of the buffer. Fix this
and add a test.
We passed the full option string from fstab to /bin/mount. It would in
turn pass the full option string to its helper, if it needed to invoke
one. Some helpers would ignore things like "nofail", but others would
be confused. We could try to get all helpers to ignore those
"meta-options", but it seems better to simply filter them out.
In our model, /bin/mount simply has no business in knowing whether the
mount was configured as fail or nofail, auto or noauto, in the
fstab. If systemd tells invokes a command to mount something, and it
fails, it should always return an error. It seems cleaner to filter
out the option, since then there's no doubt how the command should
behave.
https://bugzilla.redhat.com/show_bug.cgi?id=1177823
We would ignore options like "fail" and "auto", and for any option
which takes a value the first assignment would win. Repeated and
options equivalent to the default are rarely used, but they have been
documented forever, and people might use them. Especially on the
kernel command line it is easier to append a repeated or negated
option at the end.
This fixes parsing of options in shared/generator.c. Existing code
had some issues:
- it would treate whitespace and semicolons as seperators. fstab(5)
is pretty clear that only commas matter. And the syntax does
not allow for spaces to be inserted in the field in fstab.
Whitespace might be escaped, but then it should not seperate
options. Treat whitespace and semicolons as any other character.
- it assumed that x-systemd.device-timeout would always be followed
by "=". But this is not guaranteed, hasmntopt will return this
option even if there's no value. Uninitialized memory could be read.
- some error paths would log, and inconsistently, some would just
return an error code.
Filtering is split out to a separate function and tests are added.
Similar code paths in other places are adjusted to use the new function.
Generators are different than unit files: they are never automatically
generated, so there's no point in allowing /etc to override /run. On
the other hand, overriding /etc might be useful in some cases.
Sometimes it is necessary to stop a generator from running. Either
because of a bug, or for testing, or some other reason. The only way
to do that would be to rename or chmod the generator binary, which is
inconvenient and does not survive upgrades. Allow masking and
overriding generators similarly to units and other configuration
files.
For the systemd instance, masking would be more common, rather than
overriding generators. For the user instances, it may also be useful
for users to have generators in $XDG_CONFIG_HOME to augment or
override system-wide generators.
Directories are searched according to the usual scheme (/usr/lib,
/usr/local/lib, /run, /etc), and files with the same name in higher
priority directories override files with the same name in lower
priority directories. Empty files and links to /dev/null mask a given
name.
https://bugs.freedesktop.org/show_bug.cgi?id=87230
Remove the optional sepearate opening of the directory,
it would be just too complicated with the change to
multiple directories.
Move the middle of execute_directory() to a seperate
function to make it easier to grok.
The 'at_console' policy-category allows to apply policy-items to clients
depending on whether they're run from within a valid user-session or not.
We use sd_uid_get_seats() to check whether a user has a valid seat (which
excludes remote-sessions like ssh).
If a dbus-1 client sends a broadcasted signal via the bus-proxy to kdbus,
the bus-proxy has no idea who the receiver is. Classic dbus-daemon has
bus-access and can perform policy checks for each receiver, but we cant.
Instead, we know the kernel will perform receiver policy checks for
broadcasts, so we can skip the policy check and just push it into the
kernel.
This fixes wpa_supplicant which has DENY rules on receive_type=signal for
non-root. As we never know the target, we always DENY all broadcasts from
wpa_supplicant.
Note that will still perform receiver-policy checks for signals that we
get from the kernel back to us. In those cases, we know the receiver
(which is us).
dbus-1 distinguishes expected and non-expected replies. An expected reply
is a reply that is sent as answer to a previously forwarded method-call
before the timeout fires. Those replies are, by default, forwarded and
DENY policy tags are ignored on them (unless explicitly stated otherwise).
We don't track reply-windows in the bus-proxy as the kernel already does
this. Furthermore, the kernel prohibits any non-expected replies (which
breaks dbus-1, but it was an odd feature, anyway).
Therefore, skip policy checks on replies and always let the kernel deal
with it!
To be correct, we should still process DENY tags marked as
send_expected_reply=true (which is *NOT* the default!). However, so far we
don't parse those attributes, and no-one really uses it, so lets not
implement it for now. It's marked as TODO if anyone feels like fixing it.
Make sure to extract the log-priority when comparing against
max-log-level, otherwise, we will always drop those messages.
This fixes bus-proxyd to properly send warnings on policy blocks.
This turns "lock-session", "activate", "unlock-session",
"enable-linger", "disable-linger" into commands that take no argument,
optionally in which case the callers session/user is implied.
More specifically, if an operation is requested on a session with an
empty name, the caller's session is used. If an operation is requested
on a seat with an empty name, the seat of the caller's session is used.
Finally, if an operation on the user with UID -1 is requested, the user
of the client's session is used (and not the UID of the client!).
Among other things, avoid log_struct() unless we really need it.
Also, use "r" as variable to store function errors in, instead of "err".
"r" is pretty much what we use everywhere else, hence using the same
here make sense.
FInally, in the child, when we want to log, make sure to open the
logging framework first, since it is explicitly closed in preparation
for the exec().
