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Suggested by @keszybz in #4488.
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core: improve mount namespace and working directory setup
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detect-virt: add --private-users switch to check if a userns is active; add Condition=private-users
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This makes applying groups after applying the working directory, this
may allow some flexibility but at same it is not a big deal since we
don't execute or do anything between applying working directory and
droping groups.
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Improve apply_working_directory() and lets get the current working directory
inside of it.
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We updated 'fn' but checked 'v' instead.
From 698c5a17
Spotted with PVS
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Fix some formatting details in the merge.
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The mount fails, even though CAP_SYS_ADMIN is granted.
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Rewrite the function to be slightly simpler. In particular, if a specific
match is found (like ConditionVirtualization=yes), simply return an answer
immediately, instead of relying that "yes" will not be matched by any of
the virtualization names below.
No functional change.
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This can be useful to silence warnings about units which fail in userns
container.
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Various things don't work when we're running in a user namespace, but it's
pretty hard to reliably detect if that is true.
A function is added which looks at /proc/self/uid_map and returns false
if the default "0 0 UINT32_MAX" is found, and true if it finds anything else.
This misses the case where an 1:1 mapping with the full range was used, but
I don't know how to distinguish this case.
'systemd-detect-virt --private-users' is very similar to
'systemd-detect-virt --chroot', but we check for a user namespace instead.
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Invalid IP addresses would be passed through as-is:
$ networkctl status wlp3s0:
● 2: wlp3s0
Link File: /usr/lib/systemd/network/99-default.link
Network File: /etc/systemd/network/wlp3s0.network
Type: wlan
State: routable (configured)
Path: pci-0000:03:00.0
Driver: iwlwifi
Vendor: Intel Corporation
Model: Centrino Advanced-N 6205 [Taylor Peak] (Centrino Advanced-N 6205 AGN)
HW Address: XXXXXXXXXX (Intel Corporate)
Address: 192.168.2.103
XXXXXXXXXXX
Gateway: 192.168.2.1 (Arcadyan Technology Corporation)
DNS: 127.0.0.5553
Instead verify that DNS= has a valid list of addresses when parsing configuration.
Fixes #4462.
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To more correctly reflect current behaviour as well as to provide
a few more details.
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shmat(..., SHM_EXEC) can be used to create writable and executable
memory, so let's block it when MemoryDenyWriteExecute is set.
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Check if values filled up by KD_FONT_OP_GET ioctl make sense -
dummy driver for example doesn't implement required functionality
at all.
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... and that that content might be outdated.
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Fixes:
$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Feb 17 2016 /bin/sh -> dash
$ ./autogen.sh c
./autogen.sh: 22: ./autogen.sh: [[: not found
...
checking whether make supports nested variables... (cached) yes
checking build system type... Invalid configuration `c': machine `c' not
recognized
configure: error: /bin/bash build-aux/config.sub c failed
this is a follow-up for a5e739a570081231
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two minor systemctl memleak fixes
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In case of running test-execute on systems with systemd < v232, several
tests like privatedevices or protectkernelmodules fail because
/run/systemd/inaccessible/ doesn't exist. In these cases, we should skip
tests to avoid unnecessary errors.
See also https://github.com/systemd/systemd/pull/4243#issuecomment-253665566
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(Also, let's not use the binary |= operator on "bool" variables).
Fix-up for 93a0884126146361ca078ec627da2cf766205a1c.
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various nss module/resolved fixes
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Fixes #4329.
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Various seccomp fixes and NEWS update.
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Properly synthesize -.slice and init.scope
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Since this unit is synthesized anyway there's no point in actually shipping it
on disk. This also has the benefit that "cd /usr/lib/systemd/system ; ls *"
won't be confused by the leading dash of the file name anymore.
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callbacks
Previously, we'd synthesize the root slice unit and the init scope unit in the
enumerator callbacks for the unit type. This is problematic if either of them
is already referenced from a unit that is loaded as result of another unit
type's enumerator logic.
Let's clean this up and simply create the two objects from the enumerator
callbacks, if they are not around yet. Do the actual filling in of the settings
from the unit_load() callbacks, to match how other units are loaded.
Fixes: #4322
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This unifies the suggested nsswitch.conf configuration for our four NSS modules to this:
hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname
Note that this restores "myhostname" to the suggested configuration of
nss-resolve for the time being, undoing 4484e1792b64b01614f04b7bde97bf019f601bf9.
"myhostname" should probably be dropped eventually, but when we do this we
should do it in full, and not only drop it from the suggested nsswitch.conf
for one of the modules, but also drop it in source and stop referring to it
altogether.
Note that nss-resolve doesn't replace nss-myhostname in full: the former only
works if D-Bus/resolved is available for resolving the local hostname, the
latter works in all cases even if D-Bus or resolved are not in operation, hence
there's some value in keeping the line as it is right now. Note that neither
dns nor myhostname are considered at all with the above configuration unless
the resolve module actually returns UNAVAIL. Thus, even though handling of
local hostname resolving is implemented twice this way it is only executed once
for each lookup.
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Let's tighten the cases when our module returns NSS_STATUS_NOTFOUND. Let's do
so only if we actually managed to talk to resolved. In all other cases stick to
NSS_STATUS_UNAVAIL as before, as it clearly indicates that our module or the
system is borked, and the "dns" fallback should really take place.
In particular this fixes the 2nd-level fallback from our own dlopen() based
fallback handling. In this case we really should return UNAVAIL so that the
caller can apply its own fallback still.
Fix-up for d7247512a904f1dd74125859d8da66166c2a6933.
Note that our own dlopen() based fallback is pretty much redundant now if
nsswitch.conf is configured like this:
hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname
In a future release we should probably drop our internal fallback then, in
favour of this nsswitch.conf-based one.
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Fix-up for #4164
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This validates the system call set table and many of our seccomp-util.c APIs.
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This allows us to unify most of the code in apply_protect_kernel_modules() and
apply_private_devices().
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"oldumount()" is not a syscall, but simply a wrapper for it, the actual syscall
nr is called "umount" (and the nr of umount() is called umount2 internally).
"sysctl()" is not a syscall, but "_syscall()" is. Fix this in the table.
Without these changes libseccomp cannot actually translate the tables in full.
This wasn't noticed before as the code was written defensively for this case.
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This adds a new seccomp_init_conservative() helper call that is mostly just a
wrapper around seccomp_init(), but turns off NNP and adds in all secondary
archs, for best compatibility with everything else.
Pretty much all of our code used the very same constructs for these three
steps, hence unifying this in one small function makes things a lot shorter.
This also changes incorrect usage of the "scmp_filter_ctx" type at various
places. libseccomp defines it as typedef to "void*", i.e. it is a pointer type
(pretty poor choice already!) that casts implicitly to and from all other
pointer types (even poorer choice: you defined a confusing type now, and don't
even gain any bit of type safety through it...). A lot of the code assumed the
type would refer to a structure, and hence aded additional "*" here and there.
Remove that.
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seccomp_add_syscall_filter_set()
Let's simplify this call, by making use of the new infrastructure.
This is actually more in line with Djalal's original patch but instead of
search the filter set in the array by its name we can now use the set index and
jump directly to it.
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A variety of fixes:
- rename the SystemCallFilterSet structure to SyscallFilterSet. So far the main
instance of it (the syscall_filter_sets[] array) used to abbreviate
"SystemCall" as "Syscall". Let's stick to one of the two syntaxes, and not
mix and match too wildly. Let's pick the shorter name in this case, as it is
sufficiently well established to not confuse hackers reading this.
- Export explicit indexes into the syscall_filter_sets[] array via an enum.
This way, code that wants to make use of a specific filter set, can index it
directly via the enum, instead of having to search for it. This makes
apply_private_devices() in particular a lot simpler.
- Provide two new helper calls in seccomp-util.c: syscall_filter_set_find() to
find a set by its name, seccomp_add_syscall_filter_set() to add a set to a
seccomp object.
- Update SystemCallFilter= parser to use extract_first_word(). Let's work on
deprecating FOREACH_WORD_QUOTED().
- Simplify apply_private_devices() using this functionality
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Let's prefer early-exit over deep-indented if blocks. Not behavioural change.
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This is a follow-up for fb8b0869a7bc30e23be175cf978df23192d59118, and makes a
couple of minor clean-up changes:
- The field name in the timestamp file is changed from "TimestampNSec=" to
"TIMESTAMP_NSEC=". This is done simply to reflect the fact that we parse the
file with the env var file parser, and hence the contents should better
follow the usual capitalization of env vars, i.e. be all uppercase.
- Needless negation of the errno parameter log_error_errno() and friends has
been removed.
- Instead of manually calculating the nsec remainder of the timestamp, use
timespec_store().
- We now check whether we were able to write the timestamp file in full with
fflush_and_check() the way we usually do it.
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Commandline parsing simplification and udev fix
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test: lets add more tests to cover SupplementaryGroups= cases.
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shared, systemctl: teach is-enabled to show install targets
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