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instance of a process
units are organized in slice trees, not only for the system instance,
but also for user systemd instances, expose this properly.
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This is useful to print wall messages from logind with the right client
tty. (to be added in a later patch)
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kdbus has been passing us the ppid file for a while, actually make use
of it.
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Also, when we do permissions checks using creds, verify that we don't do
so based on augmented creds, as extra safety check.
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This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
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The kernel provides capabilities as a u32 array, sd-bus uses an u8 array.
This works fine on little-endian as both are encoded the same way.
However, this fails on big-endian if we do not perform sufficient
byte-swapping on each u32 entry.
This patch makes sd-bus use u32, too. We avoid changing any kernel
provided data so we can keep pointing into kdbus pool buffers which
contain u32 arrays.
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The number of available caps can be read from
/proc/sys/kernel/cap_last_cap during runtime. Our helper cap_last_cap()
does that, so there's no reason to remember the size of any capability
cache. We can just pre-allocate arrays with a suitable size for all
available caps and reject any higher caps.
The kernel capability API uses u32 as base so make sure we do the same.
Note that this is specified by POSIX, so it's unlikely to change.
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As kdbus no longer exports this, remove all traces from sd-bus too
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KDBUS_ITEM_PIDS structure from KDBUS_ITEM_CREDS
Also:
- adds support for euid, suid, fsuid, egid, sgid, fsgid fields.
- makes augmentation of creds with data from /proc explicitly
controllable to give apps better control over this, given that this is
racy.
- enables augmentation for kdbus connections (previously we only did it
for dbus1). This is useful since with recent kdbus versions it is
possible for clients to control the metadata they want to send.
- changes sd_bus_query_sender_privilege() to take the euid of the client
into consideration, if known
- when we don't have permissions to read augmentation data from /proc,
don't fail, just don't add the data in
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kdbus recently renamed this concept, and so should we in what we expose
in userspace.
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We still only produce on .so, but let's keep the sources separate to make things a bit
less messy.
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