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Currently we allocate fixed-size memory for event sources: the largest
any of the event source type needs. Discrepancy in the sizes needed for
the various event sources is quite major however: it's 144 bytes on
x86_64, i.e. more than two cache lines.
hence, let's be a tiny bit more careful, and allocate exactly as much as
we need, but not more.
This allows accompanying a signal with a value (as supported for Linux
Realtime signals). This is particularly useful as it allows us to do
stuff like this:
systemctl kill --kill-whom=main --kill-value=0x300 systemd-journald
In order to ask journald to flush its allocation caches and compact
memory.
This augments the existing KillUnit() + Kill() methods with
QueueSignalUnit() + QueueSignal(), which are what sigqueue() is to
kill().
This is useful for sending our new SIGRTMIN+18 control signals to system
services.
Otherwise, if /dev/shm has a directory that cannot be accessible by
unprivileged user, then we cannot pick a dynamic user, and test service
may fail with unexpected error code:
---
Failed to enter shared memory directory /dev/shm/systemd-watch-bind-BqAGlN: Permission denied
exec-dynamicuser-supplementarygroups.service: Failed to update dynamic user credentials: Device or resource busy
exec-dynamicuser-supplementarygroups.service: Failed at step USER spawning /bin/sh: Device or resource busy
src/test/test-execute.c:885:test_exec_dynamicuser: exec-dynamicuser-supplementarygroups.service: can_unshare=no: exit status 217, expected 216
---
Follow-up for 4e032f654b94c2544ccf937209303766dfa66c24.
The TPM code expects a description unless the PCR index indicates that
no measurements have to take place. The assert was preempting this
check from happening.
Fixes: #26428
Remove duplicate KERNEL_INSTALL_MACHINE_ID from message and also
specify the correct origin of layout variable.
Signed-off-by: Samanta Navarro <ferivoz@riseup.net>
When default.target is rescue.target, exiting from the single-user shell
results in lost of the control of the current terminal. This is because the
operation performed to continue to boot is systemctl default but default.target
is now rescue.target and it is already active. Hence, no new process that
controls the current terminal is created. Users need to make hardware reset to
recover the situation.
This sounds like a bit corner case issue and some might feel configuring
default.target as rescue.target is odd because there are several other ways to
transition to rescue.mode without configuring default.target to rescue.target
such as systemctl rescue or systemd.unit=rescue.target something like
that. However, users unfamiliar with systemd operations tend to come up with
systemctl set-default rescue.target.
To fix this issue, let's transition to default.target only when default.target
is inactive. Otherwise, invoke the single-user shell again to keep control of
the current terminal for users.
This new logic depends on whether D-Bus working well. Exiting without any check
of result of systemctl default could lead to again the control lost of the
current terminal. Hence, add checking results of each D-Bus operations
including systemctl default and invoke the single-user shell if they fail.
