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This substantially reworks mempool_cleanup() so that it releases pools
with all freed tiles only, but keeps all pools with still-allocated
tiles around.
This is more correct, as the previous implementation just released all
pools regardless if anything was still used or not. This would make
valgrind shut up but would just hide memory leaks altogether. Moreover
if called during regular runtime of a program would result in bad memory
accesses all over.
Hence, let's add a proper implementation and only trim pools we really
know are empty.
This way we can safely call these functions later, when under memory
pressure, at any time.
To match how we usually do this current allocation code.
(Also, make it accept a NULL pointer, also in order to match behaviour
in the rest of our codebase)
TPM2 marshalling will never increase the total size, only possibly decrease.
There is no need for checking for insufficient size if the buffer size
is set to the sizeof both objects to be marshalled.
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 4e032f654b.
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>
