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We normally expect sd-resolved only to return the validated subset of a
validated response. In some cases we give up on validating, because we
have enough information already to conclude the answer is bogus.
Let's be sure to always reply with only the validated subset in these
cases too, so that we don't return bogus answers and confuse primitive
clients that won't see the SERVFAIL rcode.
Fixes a bug introduced in e44f06065b: it was
supposed to be a refactoring, but unfortunately FOREACH_ARRAY is implemented
using a for loop, so when the 'goto finish' was replaced by 'break', it only
broke the inner loop, leading to a infinite loop.
Today listen file descriptors created by socket unit don't get passed to
commands in Exec{Start,Stop}{Pre,Post}= socket options.
This prevents ExecXYZ= commands from accessing the created socket FDs to do
any kind of system setup which involves the socket but is not covered by
existing socket unit options.
One concrete example is to insert a socket FD into a BPF map capable of
holding socket references, such as BPF sockmap/sockhash [1] or
reuseport_sockarray [2]. Or, similarly, send the file descriptor with
SCM_RIGHTS to another process, which has access to a BPF map for storing
sockets.
To unblock this use case, pass ListenXYZ= file descriptors to ExecXYZ=
commands as listen FDs [4]. As an exception, ExecStartPre= command does not
inherit any file descriptors because it gets invoked before the listen FDs
are created.
This new behavior can potentially break existing configurations. Commands
invoked from ExecXYZ= might not expect to inherit file descriptors through
sd_listen_fds protocol.
To prevent breakage, add a new socket unit parameter,
PassFileDescriptorsToExec=, to control whether ExecXYZ= programs inherit
listen FDs.
[1] https://docs.kernel.org/bpf/map_sockmap.html
[2] https://lore.kernel.org/r/20180808075917.3009181-1-kafai@fb.com
[3] https://man.archlinux.org/man/socket.7#SO_INCOMING_CPU
[4] https://www.freedesktop.org/software/systemd/man/latest/sd_listen_fds.html
Drop connections and caches and reload config from files, to allow
for low-interruptions updates, and hook up to the usual SIGHUP and
ExecReload=. Mark servers and services configured directly via D-Bus
so that they can be kept around, and only the configuration file
settings are dropped and reloaded.
Fixes https://github.com/systemd/systemd/issues/17503
Fixes https://github.com/systemd/systemd/issues/20604
* efi: Measure into both CC and TPM if available.
It's possible that both measurement protocols are made available, so
instead of assuming only one or the other are available, measure into
both to avoid a problem like CVE-2021-42299.
Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
