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When an exec directory is shared between services, this allows one of the
service to be the producer of files, and the other the consumer, without
letting the consumer modify the shared files.
This will be especially useful in conjunction with id-mapped exec directories
so that fully sandboxed services can share directories in one direction, safely.
In
68511cebe5
the ability to pass the
coredump's mount namespace fd from the coredump patter handler was added
to systemd-coredump. For this the protocol was augmented, in attempt to
provide both forward and backward compatibility.
The protocol as of v256: one or more datagrams with journal log fields
about the coredump are sent via an SOCK_SEQPACKET connection. It is
finished with a zero length datagram which carries the coredump fd (this
last datagram is called "sentinel" sometimes).
The protocol after
68511cebe5
is extended
so that after the sentinal a 2nd sentinel is sent, with a pair of fds:
the coredump fd *again* and a mount fd (acquired via open_tree()) of the
container's mount tree. It's a bit ugly to send the coredump fd a 2nd
time, but what's more important the implementation didn't work: since on
SOCK_SEQPACKET a zero sized datagram cannot be distinguished from EOF
(which is a Linux API design mistake), an early EOF would be
misunderstood as a zero size datagram lacking any fd, which resulted in
protocol termination.
Moreover, I think if we touch the protocol we should make the move to
pidfs at the same time.
All of the above is what this protocol rework addresses.
1. A pidfd is now sent as well
2. The protocol is now payload, followed by the coredump fd datagram (as
before). But now followed by a second empty datagram with a pidfd,
and a third empty datagram with the mount tree fd. Of this the latter
two or last are optional. Thus, it's now a stream of payload
datagrams with one, two or three fd-laden datagrams as sentinel. If
we read the 2nd or 3rd sentinel without an attached fd we assume this
is actually an EOF (whether it actually is one or not doesn't matter
here). This should provide nice up and down compatibility.
3. The mount_tree_fd is moved into the Context object. The pidfd is
placed there too, as a PidRef. Thus the data we pass around is now
the coredump fd plus the context, which is simpler and makes a lot
more semantical sense I think.
4. The "first" boolean is replaced by an explicit state engine enum
Fixes: https://github.com/systemd/systemd/issues/34130
instead of passing a boolean picking the destruction method just have
different functions. That's much nicer in context of _cleanup_, and how
we usually do things.
Use pidref to acquire some fields. This just makes use of the pidref
helpers we already have. We acquire a lot of other data via classic pids
still, but for that we first have to write race-free pidref getters,
hence leave that for another time.
In 68511cebe5 the ability to pass the
coredump's mount namespace fd from the coredump patter handler was added
to systemd-coredump. For this the protocol was augmented, in attempt to
provide both forward and backward compatibility.
The protocol as of v256: one or more datagrams with journal log fields
about the coredump are sent via an SOCK_SEQPACKET connection. It is
finished with a zero length datagram which carries the coredump fd (this
last datagram is called "sentinel" sometimes).
The protocol after 68511cebe5 is extended
so that after the sentinal a 2nd sentinel is sent, with a pair of fds:
the coredump fd *again* and a mount fd (acquired via open_tree()) of the
container's mount tree. It's a bit ugly to send the coredump fd a 2nd
time, but what's more important the implementation didn't work: since on
SOCK_SEQPACKET a zero sized datagram cannot be distinguished from EOF
(which is a Linux API design mistake), an early EOF would be
misunderstood as a zero size datagram lacking any fd, which resulted in
protocol termination.
Moreover, I think if we touch the protocol we should make the move to
pidfs at the same time.
All of the above is what this protocol rework addresses.
1. A pidfd is now sent as well
2. The protocol is now payload, followed by the coredump fd datagram (as
before). But now followed by a second empty datagram with a pidfd,
and a third empty datagram with the mount tree fd. Of this the latter
two or last are optional. Thus, it's now a stream of payload
datagrams with one, two or three fd-laden datagrams as sentinel. If
we read the 2nd or 3rd sentinel without an attached fd we assume this
is actually an EOF (whether it actually is one or not doesn't matter
here). This should provide nice up and down compatibility.
3. The mount_tree_fd is moved into the Context object. The pidfd is
placed there too, as a PidRef. Thus the data we pass around is now
the coredump fd plus the context, which is simpler and makes a lot
more semantical sense I think.
4. The "first" boolean is replaced by an explicit state engine enum
Fixes: #34130
Let's rename this local variable, since we are not operating on the
coredump process here after all, but on the leader of the namespace the
coredump process in, which is quite different, hence let's make this
very clear via the name.
Follow-up for d2ebf5cc1d.
The detailed error response is already logged, hence not necessary to
log again with the errno converted from the error response, which typically
less informative, e.g.
===
varlink-26-26: Setting state idle-server
varlink-26-26: Received message: {"method":"io.systemd.UserDatabase.GetUserRecord","parameters":{"service":""}}
varlink-26-26: Changing state idle-server → processing-method
varlink-26-26: Sending message: {"error":"io.systemd.UserDatabase.BadService","parameters":{}}
varlink-26-26: Changing state processing-method → processed-method
varlink-26-26: Callback for io.systemd.UserDatabase.GetUserRecord returned error: Invalid request descriptor
varlink-26-26: Changing state processed-method → idle-server
varlink-26-26: Got POLLHUP from socket.
===
systemd-sysupdated is still unstable and we'd like to make breaking
changes to it even after the v257 release, so we document it as such and
disable building it by default in release builds. The distro can still
opt-in, and we still build it in developer mode so it has CI coverage
This commit introduces a build-time option to enable/disable sysupdated
separately from sysupdate. 'auto' translated to enabled by default in
developer builds.
Setting this flag is a noop without a corresponding call to
posix_spawnattr_setsigdefault.
If we call posix_spawnattr_setsigdefault with a full signal set,
it causes glibc's posix_spawn implementation to call sigaction 63 times,
once for each signal. That seems wasteful.
This feature is really only useful for signals which have their
disposition set to SIG_IGN. Otherwise the dispostion gets set to
SIG_DFL automatically, either by clone(CLONE_CLEAR_SIGHAND) or the
subsequent execve.
As far as I can tell, systemd does not have any signals set to SIG_IGN
under normal operating conditions.
The previous behavior of systemctl --when= seems absurd, i.e.
if we fail to schedule shutdown in the future it's performed
immediately. Let's instead hard fail, which also removes the need
of specializing on certain errnos (preparation for later commits).
Those text sections had a trailing NUL byte. It's debatable whether this is a
good idea or not. Correctly written consumers will look at the section size so
they wouldn't need this. Shim doesn't use a trailing NUL, so let's follow suit.
Fixes https://github.com/systemd/systemd/issues/33731.
898e9edc46 reworked this code, but didn't actually
change the logic. We have always been appending the trailing zero by using a
NUL-terminated string as the section contents. (I checked this with v253.18
from before the elf2efi rework.)
.sdmagic contains a string like "#### LoaderInfo: systemd-boot 257~devel ####",
which changes with each version, so previous versions would compare unequal
anyway, so we don't need to worry about backwards compatibility.
This effectively reverts d2c1451b73.
After the commit d2ebf5cc1d, sd_varlink_error()
returns negative errno, hence the function always return negative errno
on failure.
Follow-up for 3cb72c7862.
The test container exits shortly, hence when varlinkctl is called, the
container may be already terminated. Let's make the container live
infinitely.
Also, this makes the os-release files removed after the container is started.
