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Document the fact that read-only properties may not have the flag
SD_BUS_VTABLE_UNPRIVILEGED as that is not obvious especially given the
flag is accepted for writable properties.
Based on the check in `add_object_vtable_internal` called by
`sd_bus_add_object_vtable` (as of the current tip of the main branch
f7f5ba0192):
case _SD_BUS_VTABLE_PROPERTY: {
[...]
if ([...] ||
[...]
(v->flags & SD_BUS_VTABLE_UNPRIVILEGED && v->type == _SD_BUS_VTABLE_PROPERTY)) {
r = -EINVAL;
goto fail;
}
(where `_SD_BUS_VTABLE_PROPERTY` means read-only property whereas
`_SD_BUS_VTABLE_WRITABLE_PROPERTY` maps to writable property).
This was implemented in the commit
adacb9575a ("bus: introduce "trusted" bus
concept and encode access control in object vtables") where
`SD_BUS_VTABLE_UNPRIVILEGED` was introduced:
Writable properties are also subject to SD_BUS_VTABLE_UNPRIVILEGED
and SD_BUS_VTABLE_CAPABILITY() for controlling write access to them.
Note however that read access is unrestricted, as PropertiesChanged
messages might send out the values anyway as an unrestricted
broadcast.
(cherry picked from commit 3ca09aa4dd)
(cherry picked from commit cd727031a4)
This tries to add information about when each option was added. It goes
back to version 183.
The version info is included from a separate file to allow generating it,
which would allow more control on the formatting of the final output.
sd-bus objects use hashmaps, which use module-global state, so it is not safe
to pass a sd-bus object created by a module instance to another module instance
(e.g.: when two libraries static linking sd-bus are pulled in a single process).
Initialize a random per-module origin id and store it in the object, and compare
it when entering a public API, and error out if they don't match, together with
the PID.
A description of SD_BUS_VTABLE_CAPABILITY is added, and the discussion
on SD_BUS_VTABLE_UNPRIVILEGED in expanded. I think it would be nice
to add longer description of how access is checked (maybe in sd-bus(3)),
but I'm leaving that for later. I think the text that was added here
describes everything, even if tersely.
Fixes#21882.
docbook would convert the newline to a space before the first argument:
SD_BUS_METHOD_WITH_ARGS( member, args, result, handler)
And we need each item in a separate <para>, otherwise they'll all be in
one line.
