When the flag is set, even if the specified UID/GID does not exist,
create a synthetic user record for the UID/GID.
Currently, only system UID/GID are supported.
Follow-up for 940441b44c.
With the commit, User=/Group=root was refused and warned that the root
is not a system user. Typically it is not necessary to specify such, but
let's not log confusing warning and honor the setting.
The buffer will be used by a library outside of our code base,
and may not be initialized even on success. Let's initialize
them for safety.
Hopefully fixes the following fuzzer warning:
```
==2039==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x7f9ad8be3ae6 in _nss_files_getsgnam_r (/lib/x86_64-linux-gnu/libnss_files.so.2+0x8ae6) (BuildId: 013bf05b4846ebbdbebdb05585acc9726c2fabce)
#1 0x7f9ad93e5902 in getsgnam_r (/lib/x86_64-linux-gnu/libc.so.6+0x126902) (BuildId: 0323ab4806bee6f846d9ad4bccfc29afdca49a58)
#2 0x7f9ad9b98153 in nss_sgrp_for_group /work/build/../../src/systemd/src/shared/user-record-nss.c:357:21
#3 0x7f9ad9b98926 in nss_group_record_by_gid /work/build/../../src/systemd/src/shared/user-record-nss.c:431:21
#4 0x7f9ad9bcebd7 in groupdb_by_gid_fallbacks /work/build/../../src/systemd/src/shared/userdb.c:1372:29
Uninitialized value was created by a heap allocation
#0 0x556fd5294302 in malloc /src/llvm-project/compiler-rt/lib/msan/msan_interceptors.cpp:1021:3
#1 0x7f9ad9b9811d in nss_sgrp_for_group /work/build/../../src/systemd/src/shared/user-record-nss.c:353:23
#2 0x7f9ad9b98926 in nss_group_record_by_gid /work/build/../../src/systemd/src/shared/user-record-nss.c:431:21
#3 0x7f9ad9bcebd7 in groupdb_by_gid_fallbacks /work/build/../../src/systemd/src/shared/userdb.c:1372:29
```
This PR provides a new option for systemd-boot
`secure-boot-enroll-action` which allows to configure the behavior after
SecureBoot keys are enrolled.
Provides the option to either reboot or power off.
The current behavior is not changed, it will by default reboot as it did
before.
It also provides a small message about the action its going to take with
a small delay so the user can read it.
Just downgrade the log message in case of ENOENT of agent binaries to
LOG_DEBUG. Do this in order to support distros which split off some
agent bianries into separate optional binaries.
Fixes: #37369
On Linux, read() on a message queue descriptor returns the message
queue statistics, not the actual message queue data. We need to use
mq_receive() to drain the queues instead.
Fixes a problem where a POSIX message queue socket unit with messages
in the queue at shutdown time could result in a hang on reboot/shutdown.
Otherwise, initrd-cleanup.service requests isolation thus the socket
is stopped before switching root, and several early events after
switching root may be lost.
Yu Watanabe
Kurt Borja
Marcos Alano
David Tardon
Mike Yuan
Daan De Meyer
Itxaka
Lennart Poettering
Todd C. Miller
anonymix007