There are overlapping control group resource settings for the unified and
legacy hierarchies. To help transition, the settings are translated back and
forth. When both versions of a given setting are present, the one matching the
cgroup hierarchy type in use is used. Unfortunately, this is more confusing to
use and document than necessary because there is no clear static precedence.
Update the translation logic so that the settings for the unified hierarchy are
always preferred. systemd.resource-control man page is updated to reflect the
change and reorganized so that the deprecated settings are at the end in its
own section.
Never permit that we write to journal files that have newer timestamps than our
local wallclock has. If we'd accept that, then the entries in the file might
end up not being ordered strictly.
Let's refuse this with ETXTBSY, and then immediately rotate to use a new file,
so that each file remains strictly ordered also be wallclock internally.
As soon as we notice that the clock jumps backwards, rotate journal files. This
is beneficial, as this makes sure that the entries in journal files remain
strictly ordered internally, and thus the bisection algorithm applied on it is
not confused.
This should help avoiding borked wallclock-based bisection on journal files as
witnessed in #4278.
Let's use the earliest linearized event timestamp for journal entries we have:
the event dispatch timestamp from the event loop, instead of requerying the
timestamp at the time of writing.
This makes the time a bit more accurate, allows us to query the kernel time one
time less per event loop, and also makes sure we always use the same timestamp
for both attempts to write an entry to a journal file.
When iterating through partially synced journal files we need to be prepared
for hitting with invalid entries (specifically: non-initialized). Instead of
generated an error and giving up, let's simply try to preceed with the next one
that is valid (and debug log about this).
This reworks the logic introduced with caeab8f626
to iteration in both directions, and tries to look for valid entries located
after the invalid one. It also extends the behaviour to both iterating through
the global entry array and per-data object entry arrays.
Fixes: #4088
Let's make dissecting of borked journal files more expressive: if we encounter
an object whose first 8 bytes are all zeroes, then let's assume the object was
simply never initialized, and say so.
Previously, this would be detected as "overly short object", which is true too
in a away, but it's a lot more helpful printing different debug options for the
case where the size is not initialized at all and where the size is initialized
to some bogus value.
No function behaviour change, only a different log messages for both cases.
Let's make it easier to figure out when we see an invalid journal file, why we
consider it invalid, and add some minimal debug logging for it.
This log output is normally not seen (after all, this all is library code),
unless debug logging is exlicitly turned on.
When date is changed in system to future and normal user logs to new journal file, and then date is changed back to present time, the "journalctl --list-boot" command goes to forever loop. This commit tries to fix this problem by checking first the boot id list if the found boot id was already in that list. If it is found, then stopping the boot id find loop.
Lets go further and make /lib/modules/ inaccessible for services that do
not have business with modules, this is a minor improvment but it may
help on setups with custom modules and they are limited... in regard of
kernel auto-load feature.
This change introduce NameSpaceInfo struct which we may embed later
inside ExecContext but for now lets just reduce the argument number to
setup_namespace() and merge ProtectKernelModules feature.
This is useful to turn off explicit module load and unload operations on modular
kernels. This option removes CAP_SYS_MODULE from the capability bounding set for
the unit, and installs a system call filter to block module system calls.
This option will not prevent the kernel from loading modules using the module
auto-load feature which is a system wide operation.
Allowed paths are unified betwen the configuration file parses and the bus
property checker. The biggest change is that the bus code now allows "block-"
and "char-" classes. In addition, path_startswith("/dev") was used in the bus
code, and startswith("/dev") was used in the config file code. It seems
reasonable to use path_startswith() which allows a slightly broader class of
strings.
Fixes#3935.
If `--test` command line option was passed, the systemd set skip_setup
to true during bootup. But after this we check again that arg_action is
test or help and opens pager depends on result.
We should skip setup in a case when `--test` is passed, but it is also
safe to set skip_setup in a case of `--help`. So let's remove first
check and move skip_setup = true to the second check.
This makes it easier to debug failed nspawn invocations:
Mounting sysfs on /var/lib/machines/fedora-rawhide/sys (MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV "")...
Mounting tmpfs on /var/lib/machines/fedora-rawhide/dev (MS_NOSUID|MS_STRICTATIME "mode=755,uid=1450901504,gid=1450901504")...
Mounting tmpfs on /var/lib/machines/fedora-rawhide/dev/shm (MS_NOSUID|MS_NODEV|MS_STRICTATIME "mode=1777,uid=1450901504,gid=1450901504")...
Mounting tmpfs on /var/lib/machines/fedora-rawhide/run (MS_NOSUID|MS_NODEV|MS_STRICTATIME "mode=755,uid=1450901504,gid=1450901504")...
Bind-mounting /sys/fs/selinux on /var/lib/machines/fedora-rawhide/sys/fs/selinux (MS_BIND "")...
Remounting /var/lib/machines/fedora-rawhide/sys/fs/selinux (MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_BIND|MS_REMOUNT "")...
Mounting proc on /proc (MS_NOSUID|MS_NOEXEC|MS_NODEV "")...
Bind-mounting /proc/sys on /proc/sys (MS_BIND "")...
Remounting /proc/sys (MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_BIND|MS_REMOUNT "")...
Bind-mounting /proc/sysrq-trigger on /proc/sysrq-trigger (MS_BIND "")...
Remounting /proc/sysrq-trigger (MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_BIND|MS_REMOUNT "")...
Mounting tmpfs on /tmp (MS_STRICTATIME "mode=1777,uid=0,gid=0")...
Mounting tmpfs on /sys/fs/cgroup (MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME "mode=755,uid=0,gid=0")...
Mounting cgroup on /sys/fs/cgroup/systemd (MS_NOSUID|MS_NOEXEC|MS_NODEV "none,name=systemd,xattr")...
Failed to mount cgroup on /sys/fs/cgroup/systemd (MS_NOSUID|MS_NOEXEC|MS_NODEV "none,name=systemd,xattr"): No such file or directory
If stdin is supplied as an fd for transient units (using the
StandardInputFileDescriptor pseudo-property for transient units), then we
should also fix up the TTY ownership, not just when we opened the TTY
ourselves.
This simply drops the explicit is_terminal_input()-based check. Note that
chown_terminal() internally does a much more appropriate isatty()-based check
anyway, hence we can drop this without replacement.
Fixes: #4260
r was not initialized and would be used if "tcp" was the only option
used for the stub. We should initialize it to 0 to indicate that no
error happened in the udp case.
SIGTERM should be considered a clean exit code for daemons (i.e. long-running
processes, as a daemon without SIGTERM handler may be shut down without issues
via SIGTERM still) while it should not be considered a clean exit code for
commands (i.e. short-running processes).
Let's add two different clean checking modes for this, and use the right one at
the appropriate places.
Fixes: #4275
When we print information about PID 1's crashdump subprocess failing. In this
case we *know* that we do not generate LSB exit codes, as it's basically PID 1
itself that exited there.
Previously we've used free_and_strdup() to fill arg_default_unit with unit
name, If we didn't pass default unit name through a kernel command line or
command line arguments. But we can use just strdup() instead of
free_and_strdup() for this, because we will start fill arg_default_unit
only if it wasn't set before.
Let's get rid of is_clean_exit_lsb(), let's move the logic for the special
handling of the two LSB exit codes into the sysv-generator by writing out
appropriate SuccessExitStatus= lines if the LSB header exists. This is not only
semantically more correct, bug also fixes a bug as the code in service.c that
chose between is_clean_exit_lsb() and is_clean_exit() based this check on
whether a native unit files was available for the unit. However, that check was
bogus since a long time, since the SysV generator was introduced and native
SysV script support was removed from PID 1, as in that case a unit file always
existed.
We are going to add this child as a source to our event loop so we don't
want to block when reading data from it as this will prevent us from
processing other events. Specifically this will block the signalfds
which means if we are waiting for data from curl we won't handle SIGTERM
or SIGINT until we happen to get more data.
Do not make up our own type for ExitStatus, but use the type used by POSIX for
this, which is "int". In particular as we never used that type outside of the
definition of exit_status_to_string() where we internally cast the paramter to
(int) every single time we used it.
Hence, let's simplify things, drop the type and use the kernel type directly.
It is impossible to ship a fully generic PAM configuration upstream.
Therefore, ship a minimal configuration with the systemd --user requirements,
and add a note to DISTRO_PORTING documenting this.
Fixes#4284
systemd fills arg_default_unit during startup with default.target
value. But arg_default_unit may be overwritten in parse_argv() or
parse_proc_cmdline_item().
Let's check value of arg_default_unit after calls of parse_argv()
and parse_proc_cmdline_item() and fill it with default.target if
it wasn't filled before. In this way we will not spend unnecessary
time to for filling arg_default_unit with default.target.
When running in a user namespace without private networking, resolved would
fail to start. There isn't much difference between EADDRINUSE and EPERM,
so treat them the same, except for the warning message text.
Make sure an error is always printed… When systemd-resolved is started in a
user namespace without private network, it would fail on setsockopt, but the
error wouldn't be particularly informative:
"Failed to start manager: permission denied."
According to TCG EFI Protocol Specification for TPM 2.0 family,
all events generated after the invocation of EFI_TCG2_GET_EVENT_LOG
shall be stored in an instance of an EFI_CONFIGURATION_TABLE aka
EFI TCG 2.0 final events table. Hence, it is necessary to trigger the
internal switch through calling get_event_log() in order to allow
to retrieve the logs from OS runtime.
msekletar:
> I've looked at EDK2 and indeed log entry is added to FinalEventsTable only after
> EFI_TCG2_PROTOCOL.GetEventLog was called[1][2]. Also, same patch was currently
> merged to shim by Peter Jones [3].
[1] https://github.com/tianocore/edk2/blob/master/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c#L698
[2] https://github.com/tianocore/edk2/blob/master/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c#L824
[3] rhinstaller/shim#64
The documentation says lists "yes", "no", "pick", and numeric arguments.
But parse_boolean was attempted first, so various numeric arguments were
misinterpreted.
In particular, this fixes --private-users=0 to mean the same thing as
--private-users=0:65536.
While at it, use strndupa to avoid some error handling.
Also give a better error for an empty UID range. I think it's likely that
people will use --private-users=0:0 thinking that the argument means UID:GID.
Current systemd version detection routine cannot detect systemd 230,
only systmed >= 231. This means that we'll still use the legacy hierarchy
in some cases where we wouldn't have too. If somebody figures out a nice
way to detect systemd 230 this can be later improved.
systemd-soon-to-be-released-232 is able to deal with the mixed hierarchy.
So make an educated guess, and use the mixed hierarchy in that case.
Tested by running the host with mixed hierarchy (i.e. simply using a recent
kernel with systemd from git), and booting first a container with older systemd,
and then one with a newer systemd.
Fixes#4008.
The new function has 416 lines by itself!
"return log_error_errno" is used to nicely reduce the volume of error
handling code.
A few minor issues are fixed on the way:
- positive value was used as error value (EIO), causing systemd-nspawn
to return success, even though it shouldn't.
- In two places random values were used as error status, when the
actual value was in an unusual place (etc_password_lock, notify_socket).
Those are the only functional changes.
There is another potential issue, which is marked with a comment, and left
unresolved: the container can also return 133 by itself, causing a spurious
reboot.
This adds a new invocation ID concept to the service manager. The invocation ID
identifies each runtime cycle of a unit uniquely. A new randomized 128bit ID is
generated each time a unit moves from and inactive to an activating or active
state.
The primary usecase for this concept is to connect the runtime data PID 1
maintains about a service with the offline data the journal stores about it.
Previously we'd use the unit name plus start/stop times, which however is
highly racy since the journal will generally process log data after the service
already ended.
The "invocation ID" kinda matches the "boot ID" concept of the Linux kernel,
except that it applies to an individual unit instead of the whole system.
The invocation ID is passed to the activated processes as environment variable.
It is additionally stored as extended attribute on the cgroup of the unit. The
latter is used by journald to automatically retrieve it for each log logged
message and attach it to the log entry. The environment variable is very easily
accessible, even for unprivileged services. OTOH the extended attribute is only
accessible to privileged processes (this is because cgroupfs only supports the
"trusted." xattr namespace, not "user."). The environment variable may be
altered by services, the extended attribute may not be, hence is the better
choice for the journal.
Note that reading the invocation ID off the extended attribute from journald is
racy, similar to the way reading the unit name for a logging process is.
This patch adds APIs to read the invocation ID to sd-id128:
sd_id128_get_invocation() may be used in a similar fashion to
sd_id128_get_boot().
PID1's own logging is updated to always include the invocation ID when it logs
information about a unit.
A new bus call GetUnitByInvocationID() is added that allows retrieving a bus
path to a unit by its invocation ID. The bus path is built using the invocation
ID, thus providing a path for referring to a unit that is valid only for the
current runtime cycleof it.
Outlook for the future: should the kernel eventually allow passing of cgroup
information along AF_UNIX/SOCK_DGRAM messages via a unique cgroup id, then we
can alter the invocation ID to be generated as hash from that rather than
entirely randomly. This way we can derive the invocation race-freely from the
messages.
Let's make sure people invoking STRV_FOREACH_BACKWARDS() as a single statement
of an if statement don't fall into a trap, and find the tail for the list via
strv_length().
This patch adds support to remote checksum checksum offload to VXLAN.
This patch adds RemoteCheckSumTx and RemoteCheckSumRx vxlan configuration
to enable remote checksum offload for transmit and receive on the VXLAN tunnel.
RISC-V is an open source ISA in development since 2010 at UCB.
For more information, see https://riscv.org/
I am adding RISC-V support to Fedora:
https://fedoraproject.org/wiki/Architectures/RISC-V
There are three major variants of the architecture (32-, 64- and
128-bit). The 128-bit variant is a paper exercise, but the other
two really exist in silicon. RISC-V is always little endian.
On Linux, the default kernel uname(2) can return "riscv" for all
variants. However a patch was added recently which makes the kernel
return one of "riscv32" or "riscv64" (or in future "riscv128"). So
systemd should be prepared to handle any of "riscv", "riscv32" or
"riscv64" (in future, "riscv128" but that is not included in the
current patch). If the kernel returns "riscv" then you need to use
the pointer size in order to know the real variant.
The Fedora/RISC-V kernel only ever returns "riscv64" since we're
only doing Fedora for 64 bit at the moment, and we've patched the
kernel so it doesn't return "riscv".
As well as the major bitsize variants, there are also architecture
extensions. However I'm trying to ensure that uname(2) does *not*
return any other information about those in utsname.machine, so that
we don't end up with "riscv64abcde" nonsense. Instead those
extensions will be exposed in /proc/cpuinfo similar to how flags
work in x86.
Let's not accept datagrams with embedded NUL bytes. Previously we'd simply
ignore everything after the first NUL byte. But given that sending us that is
pretty ugly let's instead complain and refuse.
With this change we'll only accept messages that have exactly zero or one NUL
bytes at the very end of the datagram.
Let's make the kernel let us know the full, original datagram size of the
incoming message. If it's larger than the buffer space provided by us, drop the
whole message with a warning.
Before this change the kernel would truncate the message for us to the buffer
space provided, and we'd not complain about this, and simply process the
incomplete message as far as it made sense.
If the kernel doesn't permit us to dequeue/process an incoming notification
datagram message it's still better to stop processing the notification messages
altogether than to enter a busy loop where we keep getting notified but can't
do a thing about it.
With this change, manager_dispatch_notify_fd() behaviour is changed like this:
- if an error indicating a spurious wake-up is seen on recvmsg(), ignore it
(EAGAIN/EINTR)
- if any other error is seen on recvmsg() propagate it, thus disabling
processing of further wakeups
- if any error is seen on later code in the function, warn about it but do not
propagate it, as in this cas we're not going to busy loop as the offending
message is already dequeued.
For some certification, it should not be possible to reboot the machine through ctrl-alt-delete. Currently we suggest our customers to mask the ctrl-alt-delete target, but that is obviously not enough.
Patching the keymaps to disable that is really not a way to go for them, because the settings need to be easily checked by some SCAP tools.
Let's drop the caching of the setgroups /proc field for now. While there's a
strict regime in place when it changes states, let's better not cache it since
we cannot really be sure we follow that regime correctly.
More importantly however, this is not in performance sensitive code, and
there's no indication the cache is really beneficial, hence let's drop the
caching and make things a bit simpler.
Also, while we are at it, rework the error handling a bit, and always return
negative errno-style error codes, following our usual coding style. This has
the benefit that we can sensible hanld read_one_line_file() errors, without
having to updat errno explicitly.
In the process execution code of PID 1, before
096424d123 the GID settings where changed before
invoking PAM, and the UID settings after. After the change both changes are
made after the PAM session hooks are run. When invoking PAM we fork once, and
leave a stub process around which will invoke the PAM session end hooks when
the session goes away. This code previously was dropping the remaining privs
(which were precisely the UID). Fix this code to do this correctly again, by
really dropping them else (i.e. the GID as well).
While we are at it, also fix error logging of this code.
Fixes: #4238
As suggested here:
https://github.com/systemd/systemd/pull/4296#issuecomment-251911349
Let's try AF_INET first as socket, but let's fall back to AF_NETLINK, so that
we can use a protocol-independent socket here if possible. This has the benefit
that our code will still work even if AF_INET/AF_INET6 is made unavailable (for
exmple via seccomp), at least on current kernels.
Currently, the ratelimit does not handle the number of suppressed messages accurately.
Even though the number of messages reaches the limit, it still allows to add one extra messages to journal.
This patch fixes the problem.
[BridgeFDB] did not apply to bridge ports so far. This patch adds the proper
handling. In case of a bridge interface the correct flag NTF_MASTER is now set
in the netlink call. FDB MAC addresses are now applied in
link_enter_set_addresses to make sure the link is setup.
If the new item is inserted before the first item in the list, then the
head must be updated as well.
Add a test to the list unit test to check for this.
If the corresponding mount unit is deserialized after the automount unit
then the expire event is set up in automount_trigger_notify(). However, if
the mount unit is deserialized first then the automount unit is still in
state AUTOMOUNT_DEAD and automount_trigger_notify() aborts without setting
up the expire event.
Explicitly call automount_start_expire() during coldplug to make sure that
the expire event is set up as necessary.
Fixes#4249.
This prevented systemd-analyze from unprivileged operation on older systemd
installations, which should be possible.
Also, we shouldn't touch the file system in test mode even if we can.
SYSTEMD_UNIT_PATH=foobar: systemd-analyze verify barbar/unit.service
will load units from barbar/, foobar/, /etc/systemd/system/, etc.
SYSTEMD_UNIT_PATH= systemd-analyze verify barbar/unit.service
will load units only from barbar/, which is useful e.g. when testing
systemd's own units on a system with an older version of systemd installed.
It needs to be possible to tell apart "the nss-resolve module does not exist"
(which can happen when running foreign-architecture programs) from "the queried
DNS name failed DNSSEC validation" or other errors. So return NOTFOUND for these
cases too, and only keep UNAVAIL for the cases where we cannot handle the given
address family.
This makes it possible to configure a fallback to "dns" without breaking
DNSSEC, with "resolve [!UNAVAIL=return] dns". Add this to the manpage.
This does not change behaviour if resolved is not running, as that already
falls back to the "dns" glibc module.
Fixes#4157
Handle general errors from the resolved call in _nss_resolve_gethostbyaddr2_r()
the same say as in the other variants: Just "goto fail" as that does exactly
the same.
"closing all" might suggest that _all_ fds received with the notification message
will be closed. Reword the message to clarify that only the "unused" ones will be
closed.
DNS servers which have route-only domains should only be used for
the specified domains. Routing queries about other domains there is a privacy
violation, prone to fail (as that DNS server was not meant to be used for other
domains), and puts unnecessary load onto that server.
Introduce a new helper function dns_server_limited_domains() that checks if the
DNS server should only be used for some selected domains, i. e. has some
route-only domains without "~.". Use that when determining whether to query it
in the scope, and when writing resolv.conf.
Extend the test_route_only_dns() case to ensure that the DNS server limited to
~company does not appear in resolv.conf. Add test_route_only_dns_all_domains()
to ensure that a server that also has ~. does appear in resolv.conf as global
name server. These reproduce #3420.
Add a new test_resolved_domain_restricted_dns() test case that verifies that
domain-limited DNS servers are only being used for those domains. This
reproduces #3421.
Clarify what a "routing domain" is in the manpage.
Fixes#3420Fixes#3421
This undoes 531ac2b234. I acked that patch without looking at the code
carefully enough. There are two problems:
- we want to process the fds anyway
- in principle empty notification messages are valid, and we should
process them as usual, including logging using log_unit_debug().
If manager_dispatch_notify_fd() fails and returns an error then the handling of
service notifications will be disabled entirely leading to a compromised system.
For example pid1 won't be able to receive the WATCHDOG messages anymore and
will kill all services supposed to send such messages.
coredump had code to check if copy_bytes() hit the max_bytes limit,
and refuse further processing in that case.
But in 84ee096044, the return convention for copy_bytes() was changed
from -EFBIG to 1 for the case when the limit is hit, so the condition
check in coredump couldn't ever trigger.
But it seems that *do* want to process such truncated cores [1].
So change the code to detect truncation properly, but instead of
returning an error, give a nice log entry.
[1] https://github.com/systemd/systemd/issues/3883#issuecomment-239106337
Should fix (or at least alleviate) #3883.
For the user, if the core file is missing or inaccessible, it is
more interesting that the fact that they forgot to pipe to a file.
So delay the failure from the check until after we have verified
that the file or the COREDUMP field are present.
Partially fixes#4161.
Also, error reporting on failure was duplicated. save_core() now
always prints an error message (because it knows the paths involved,
so can the most useful message), and the callers don't have to.
Propagate errors properly, so that if we hit oom or an error in the
journal, the whole command will fail. This is important when using
the output in scripts.
Support the output of multiple values for the same field with -F.
The journal supports that, and our official commands should too, as
far as it makes sense. -F can be used to print user-defined fields
(e.g. somebody could use a TAG field with multiple occurences), so
we should support that too. That seems better than silently printing
the last value found as was done before.
We would iterate trying to match the same field with all possible
field names. Once we find something, cut the loop short, since we
know that nothing else can match.
The column for "present" was easy to miss, especially if somebody had no
coredumps present at all, in which case the column of spaces of width one
wasn't visually distinguished from the neighbouring columns. Replace this
with an explicit text, one of: "missing", "journal", "present", "error".
$ coredumpctl
TIME PID UID GID SIG COREFILE EXE
Mon 2016-09-26 22:46:31 CEST 8623 0 0 11 missing /usr/bin/bash
Mon 2016-09-26 22:46:35 CEST 8639 1001 1001 11 missing /usr/bin/bash
Tue 2016-09-27 01:10:46 CEST 16110 1001 1001 11 journal /usr/bin/bash
Tue 2016-09-27 01:13:20 CEST 16290 1001 1001 11 journal /usr/bin/bash
Tue 2016-09-27 01:33:48 CEST 17867 1001 1001 11 present /usr/bin/bash
Tue 2016-09-27 01:37:55 CEST 18549 0 0 11 error /usr/bin/bash
Also, use access(…, R_OK), so that we can report a present but inaccessible
file different than a missing one.
In 'list', show present also for coredumps stored in the journal.
In 'status', replace "File" with "Storage" line that is always present.
Possible values:
Storage: none
Storage: journal
Storage: /path/to/file (inacessible)
Storage: /path/to/file
Previously the File field be only present if the file was accessible, so users
had to manually extract the file name precisely in the cases where it was
needed, i.e. when coredumpctl couldn't access the file. It's much more friendly
to always show something. This output is designed for human consumption, so
it's better to be a bit verbose.
The call to sd_j_set_data_threshold is moved, so that status is always printed
with the default of 64k, list uses 4k, and coredump retrieval is done with the
limit unset. This should make checking for the presence of the COREDUMP field
not too costly.
Added in 9fe13294a9 (by me :[```), and later obfuscated in d0c8806d4a, if an
uncompressed external file or an internally stored coredump was supposed to be
written to a file descriptor, nothing would be written.
Back when external storage was initially added in 34c10968cb, this mode of
storage was added. This could have made some sense back when XZ compression was
used, and an uncompressed core on disk could be used as short-lived cache file
which does require costly decompression. But now fast LZ4 compression is used
(by default) both internally and externally, so we have duplicated storage,
using the same compression and same default maximum core size in both cases,
but with different expiration lifetimes. Even the uncompressed-external,
compressed-internal mode is not very useful: for small files, decompression
with LZ4 is fast enough not to matter, and for large files, decompression is
still relatively fast, but the disk-usage penalty is very big.
An additional problem with the two modes of storage is that it complicates
the code and makes it much harder to return a useful error message to the user
if we cannot find the core file, since if we cannot find the file we have to
check the internal storage first.
This patch drops "both" storage mode. Effectively this means that if somebody
configured coredump this way, they will get a warning about an unsupported
value for Storage, and the default of "external" will be used.
I'm pretty sure that this mode is very rarely used anyway.
This appends the nvme name and namespace identifier attribute the the
PCI path for by-path links. Symlinks like the following are now present:
lrwxrwxrwx. 1 root root 13 Sep 16 12:12 pci-0000:01:00.0-nvme-1 -> ../../nvme0n1
lrwxrwxrwx. 1 root root 15 Sep 16 12:12 pci-0000:01:00.0-nvme-1-part1 -> ../../nvme0n1p1
Cc: Michal Sekletar <sekletar.m@gmail.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
There was no certainty about how the path in service file should look
like for usb functionfs activation. Because of this it was treated
differently in different places, which made this feature unusable.
This patch fixes the path to be the *mount directory* of functionfs, not
ep0 file path and clarifies in the documentation that ListenUSBFunction should be
the location of functionfs mount point, not ep0 file itself.
This patch fixes wrong calculation of burst_modulate(), which now calculates
the values smaller than really expected ones if available disk space is
strictly more than 1MB.
In particular, if available disk space is strictly more than 1MB and strictly
less than 16MB, the resulted value becomes smaller than its original one.
>>> (math.log2(1*1024**2)-16) / 4
1.0
>>> (math.log2(16*1024**2)-16) / 4
2.0
>>> (math.log2(256*1024**2)-16) / 4
3.0
→ This matches the comment in the function.
If ulimit is smaller than page_size(), function save_external_coredump()
returns -EBADSLT and this causes skipping whole core dumping part in
submit_coredump(). Initializing coredump_size to UINT64_MAX prevents
evaluating a condition with uninitialized varialbe which leads to
calling allocate_journal_field() with coredump_fd = -1 which causes
aborting.
Signed-off-by: Matej Habrnal <mhabrnal@redhat.com>
ProtectSystem= with all its different modes and other options like
PrivateDevices= + ProtectKernelTunables= + ProtectHome= are orthogonal,
however currently it's a bit hard to parse that from the implementation
view. Simplify it by giving each mode its own table with all paths and
references to other Protect options.
With this change some entries are duplicated, but we do not care since
duplicate mounts are first sorted by the most restrictive mode then
cleaned.
Make ALSA entries, latency interface, mtrr, apm/acpi, suspend interface,
filesystems configuration and IRQ tuning readonly.
Most of these interfaces now days should be in /sys but they are still
available through /proc, so just protect them. This patch does not touch
/proc/net/...
Move out mount calculation on its own function. Actually the logic is
smart enough to later drop nop and duplicates mounts, this change
improves code readability.
---
src/core/namespace.c | 47 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 36 insertions(+), 11 deletions(-)
Instead of having all these paths everywhere, put the ones that are
protected by ProtectKernelTunables= into their own table. This way it
is easy to add paths and track which ones are protected.
If device access is restricted via PrivateDevices=, let's also block the
various low-level I/O syscalls at the same time, so that we know that the
minimal set of devices in our virtualized /dev are really everything the unit
can access.
This adds logic to chase symlinks for all mount points that shall be created in
a namespace environment in userspace, instead of leaving this to the kernel.
This has the advantage that we can correctly handle absolute symlinks that
shall be taken relative to a specific root directory. Moreover, we can properly
handle mounts created on symlinked files or directories as we can merge their
mounts as necessary.
(This also drops the "done" flag in the namespace logic, which was never
actually working, but was supposed to permit a partial rollback of the
namespace logic, which however is only mildly useful as it wasn't clear in
which case it would or would not be able to roll back.)
Fixes: #3867
Let's create the new namespace only after we validated and processed all
parameters, right before we start with actually mounting things.
This way, the window where we can roll back is larger (not that it matters
IRL...)
If PrivateDevices=yes is set, the namespace code creates device nodes in /dev
that should be owned by the host's root, hence let's make sure we set up the
namespace before dropping group privileges.
Let's make sure that services that use DynamicUser=1 cannot leave files in the
file system should the system accidentally have a world-writable directory
somewhere.
This effectively ensures that directories need to be whitelisted rather than
blacklisted for access when DynamicUser=1 is set.
Let's tighten our sandbox a bit more: with this change ProtectSystem= gains a
new setting "strict". If set, the entire directory tree of the system is
mounted read-only, but the API file systems /proc, /dev, /sys are excluded
(they may be managed with PrivateDevices= and ProtectKernelTunables=). Also,
/home and /root are excluded as those are left for ProtectHome= to manage.
In this mode, all "real" file systems (i.e. non-API file systems) are mounted
read-only, and specific directories may only be excluded via
ReadWriteDirectories=, thus implementing an effective whitelist instead of
blacklist of writable directories.
While we are at, also add /efi to the list of paths always affected by
ProtectSystem=. This is a follow-up for
b52a109ad3 which added /efi as alternative for
/boot. Our namespacing logic should respect that too.
Previously, if ReadWritePaths= was nested inside a ReadOnlyPaths=
specification, then we'd first recursively apply the ReadOnlyPaths= paths, and
make everything below read-only, only in order to then flip the read-only bit
again for the subdirs listed in ReadWritePaths= below it.
This is not only ugly (as for the dirs in question we first turn on the RO bit,
only to turn it off again immediately after), but also problematic in
containers, where a container manager might have marked a set of dirs read-only
and this code will undo this is ReadWritePaths= is set for any.
With this patch behaviour in this regard is altered: ReadOnlyPaths= will not be
applied to the children listed in ReadWritePaths= in the first place, so that
we do not need to turn off the RO bit for those after all.
This means that ReadWritePaths=/ReadOnlyPaths= may only be used to turn on the
RO bit, but never to turn it off again. Or to say this differently: if some
dirs are marked read-only via some external tool, then ReadWritePaths= will not
undo it.
This is not only the safer option, but also more in-line with what the man page
currently claims:
"Entries (files or directories) listed in ReadWritePaths= are
accessible from within the namespace with the same access rights as
from outside."
To implement this change bind_remount_recursive() gained a new "blacklist"
string list parameter, which when passed may contain subdirs that shall be
excluded from the read-only mounting.
A number of functions are updated to add more debug logging to make this more
digestable.
This adds a new call get_user_creds_clean(), which is just like
get_user_creds() but returns NULL in the home/shell parameters if they contain
no useful information. This code previously lived in execute.c, but by
generalizing this we can reuse it in run.c.
Show is documented to be program-parseable, and printing the warning about
about a non-existent unit, while useful for humans, broke a lot of scripts.
Restore previous behaviour of returning success and printing empty or useless
stuff for units which do not exist, and printing empty values for properties
which do not exists.
With SYSTEMD_LOG_LEVEL=debug, hints are printed, but the return value is
still 0.
This undoes parts of e33a06a and 3dced37b7 and fixes#3856.
We might consider adding an explicit switch to fail on missing units/properties
(e.g. --ensure-exists or similar), and make -P foobar equivalent to
--ensure-exists --property=foobar.
