Luca Boccassi [Thu, 14 Mar 2024 23:44:20 +0000 (23:44 +0000)]
nspawn: ensure single-process container running as --user can access credentials
When starting a container with --user, the new uid will be resolved and switched to
only in the inner child, at the end of the setup, by spawning getent. But the
credentials are set up in the outer child, long before the user is resolvable,
and the directories/files are made only readable by root and read-only, which
means they cannot be changed later and made visible to the user.
When this particular combination is specified, it is obvious the caller wants
the single-process container to be able to use credentials, so make them world
readable only in that specific case.
resolved: rename DnssdService "name" field to "id"
"name" is a bit confusing since this field is *not* the DNS-SD service
identifier, bust just some string derived from the .dnssd filename that
is used as handle for the service. Let's hence give it a better name:
"id".
While we are at it, switch from basename() to path_extract_filename().
Enable the exec_fd logic for Type=notify* services too, and change it
to send a timestamp instead of a '1' byte. Record the timestamp in a
new ExecMainHandoverTimestamp property so that users can track accurately
when control is handed over from systemd to the service payload, so
that latency and startup performance can be trivially and accurately
tracked and attributed.
Right now systemd-tpm2-setup-early and systemd-pcrphase-initrd.service
are not ordered against each other. However, they require the same slow
resource to operate: the TPM2. If we allow them to access the device
simultaneously, the kernel resource manager like has to save/restore TPM
state while they operate, slowing things down further.
hence, let's avoid all this mess, and just order them against each other
so that the shared resource is first used in full by one and then by the
other.
I opted to order systemd-pcrphase-initrd before
systemd-tpm2-setup-early, since there's value in having the former as
early as possible in userspace, to be a good marker for the transition
from kernel to first userspace. I can see no benefit in the opposite
order however.
We shouldn't try to use any ANSI escape sequences if TERM=dumb.
Also, the "\r\n" we output can get interpreted as a double newline
(for example by Github Actions), so let's output just "\n" when
TERM=dumb to clean up the CI logs.
tpm2-util: add generic wrapper tpm2_context_new_or_warn() that wrpas tpm2_context_new and logs about errors
We so far just print a short log message that is not very useful, let's
add some recognizable error codes, and output better log messages if we
can't get TPM stuff to work.
sd-event: fix fd leak when fd is owned by IO event source
When an IO event source owns relevant fd, replacing with a new fd leaks
the previously assigned fd.
===
sd_event_add_io(event, &s, fd, ...);
sd_event_source_set_io_fd_own(s, true);
sd_event_source_set_io_fd(s, new_fd); <-- The previous fd is not closed.
sd_event_source_unref(s); <-- new_fd is closed as expected.
===
Without the change, valgrind reports the leak:
==998589==
==998589== FILE DESCRIPTORS: 4 open (3 std) at exit.
==998589== Open file descriptor 4:
==998589== at 0x4F119AB: pipe2 (in /usr/lib64/libc.so.6)
==998589== by 0x408830: test_sd_event_source_set_io_fd (test-event.c:862)
==998589== by 0x403302: run_test_table (tests.h:171)
==998589== by 0x408E31: main (test-event.c:935)
==998589==
==998589==
==998589== HEAP SUMMARY:
==998589== in use at exit: 0 bytes in 0 blocks
==998589== total heap usage: 33,305 allocs, 33,305 frees, 1,283,581 bytes allocated
==998589==
==998589== All heap blocks were freed -- no leaks are possible
==998589==
==998589== For lists of detected and suppressed errors, rerun with: -s
==998589== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Try path without sbin even if compiled with split-bin=true
I'm working on the transition to merged sbin in Fedora. While the transition is
happening (and probably for a while after), we need to compile systemd with
split-bin=true to support systems upgraded from previous versions. But when the
system has been upgraded and already has /usr/sbin that is a symlink, be nice
and give $PATH without sbin.
We check for both /usr/sbin and /usr/local/sbin. If either exists and is not a
symlink to ./bin, we retain previous behaviour. This means that if both are
converted, we get the same behaviour as split-bin=false, and otherwise we
get the same behaviour as before.
sd-path uses the same logic. This is not a hot path, so I got rid of the nulstr
macros that duplicated the logic.
test: Don't allocate scope if already running in unit with delegated cgroup
If we're already running in a unit with delegation turned on, let's
skip allocation of a scope unit and cgroup subroot. This allows journald
to correctly attribute the logs of all subprocesses spawned by tests such
as test-execute to the test-execute service when the test is running in a service.
Specifically, this will make tests log to the journal if stderr is
connected to the journal. This means we get proper log priorities
and such compared to if we just logged to stderr.
mkosi: Install various system users/groups in opensuse images
These don't get pulled in automatically and there doesn't seem to
be a "system-users" package so install the ones we need for the
integration tests manually.
mkosi: Backport Fedora basic users/groups sysusers files to CentOS
CentOS does not ship these sysusers dropins which set up basic system
users and groups. Until we can move to CentOS Stream 10, let's add the
dropins ourselves to make sure the base system users/groups are available
on CentOS.
The Arch Linux PKGBUILD does not (yet) have versioned dependencies
between the systemd packages, causing systemd-libs to not get updated
to 256-devel if systemd 256-devel is installed. Let's explicitly install
the newer version of systemd-libs as well for now until this problem is
fixed.
This introduces dependencies on various environment variables set
by rpmbuild which will not be set when rerunning meson inside the
VM/container so let's disable package notes to avoid these dependencies,
as the package notes aren't terribly useful in this scenario anyway.
sd-journal: downgrade log message "Unused data (entry_offset==0)"
This happens when journal is rotated after a data is written but before
an entry that linked to the data is not written yet.
This is neither data corruption, nor program error. Let's downgrade the
log level.
This passes an ID derived from the vmgenid down to all VMs. This is
useful to have an identifier for this VM generation id. We derive it
from the invocation ID, if we have one, otherwise we randomize it.
Eventually we should make use of the vmgenid changing to re-acquire MAC
addresses, DHCP leases as such. Let's for now enable the VMM side of the
concept as first step towards that.
THese are generally recommended (and libvirt/gnome-boxes default to them
hence). They are mostly relevant for Windows, but I think it makes sense
to enable them anyway for Linux too, simply to excercise #28001, and
they shouldn't hurt.
Previously, the path is obtained from the fd, but it is closed in
sd_event_loop() to unpin the filesystem.
So, let's save the path when the event source is created, and make
sd_event_source_get_inotify_path() simply read it.
man: correct where we look for auxiliary partitions
We look for the root fs on the device of the booted ESP, and for the
other partitions on the device of the root fs. On EFI systems this
generally boils down to the same, but there are cases where this doesn't
hold, hence document this properly.
projects / thirdparty / systemd.git / log
