The path may have unbounded length, for example through a fuse mount.
CVE-2021-33910: attacked controlled alloca() leads to crash in systemd and
ultimately a kernel panic. Systemd parses the content of /proc/self/mountinfo
and each mountpoint is passed to mount_setup_unit(), which calls
unit_name_path_escape() underneath. A local attacker who is able to mount a
filesystem with a very long path can crash systemd and the whole system.
The resulting string length is bounded by UNIT_NAME_MAX, which is 256. But we
can't easily check the length after simplification before doing the
simplification, which in turns uses a copy of the string we can write to.
So we can't reject paths that are too long before doing the duplication.
Hence the most obvious solution is to switch back to strdup(), as before 7410616cd9dbbec97cf98d75324da5cda2b2f7a2.
network: Delay addition of IPv6 Proxy NDP addresses
Setting of IPv6 Proxy NDP addresses must be done at the same
time as static addresses, static routes, and other link attributes
that must be configured when the link is up. Doing this ensures
that they are reconfigured on the link if the link goes down
and returns to service.
LoadCredentials=foo causes an assertion to be triggered, as we
are not checking that the rvalue's right hand side part is non-empty
before using it in unit_full_printf.
Jan Tojnar [Sat, 2 Jan 2021 01:46:33 +0000 (02:46 +0100)]
pkg-config: make prefix overridable again
While we don't support prefix being != /usr, and this is hardcoded
all over the place, variables in pkg-config file are expected
to have overridable base directory.
This is important for at least the following two use cases:
- Installing projects to non-FHS package-specific prefixes for Nix-style
package managers. Of course, it is then their responsibility
to ensure systemd can find the service files.
- Installing to local path for development purposes.
This is a compromise between running a program from a build directory,
and running it fully installed to system prefix.
You will not want to write to system prefix in either case.
For more information, see also
https://www.bassi.io/articles/2018/03/15/pkg-config-and-paths/
rules: Move ID_SMARTCARD_READER definition to a <70 configuration.
70-uaccess.rules sets the uaccess tag on devices with ID_SMARTCARD_READER
set, but it is set in 99-systemd.rules .
Move this to a 60-*.rules which already matches USB CCID class, factorising
the matching, so 70-uaccess.rules sets up these devices as expected.
Nominally, the bug was in unit_load_dropin(), which just took the last mtime
instead of calculating the maximum. But instead of adding code to wrap the
loop, this patch goes in the other direction.
All (correct) callers of config_parse() followed a very similar pattern to
calculate the maximum mtime. So let's simplify things by making config_parse()
assume that mtime is initialized and update it to the maximum. This makes all
the callers that care about mtime simpler and also fixes the issue in
unit_load_dropin().
config_parse_many_nulstr() and config_parse_many() are different, because it
makes sense to call them just once, and current ret_mtime behaviour make sense.
Matthias Klumpp [Fri, 8 Jan 2021 22:59:38 +0000 (23:59 +0100)]
localed: Run locale-gen if available to generate missing locale
This change improves integration with distributions using locale-gen to
generate missing locale on-demand, like Debian-based distributions
(Debian/Ubuntu/PureOS/Tanglu/...) and Arch Linux.
We only ever enable new locales for generation, and never disable them.
Furthermore, we only generate UTF-8 locale.
This feature is only used if explicitly enabled at compile-time, and
will also be inert at runtime if the locale-gen binary is missing.
[ Arnaud Rebillout ]
* Fix root-unittests.
* CVE-2026-4105: Local privilege escalation in systemd-machined.
* CVE-2026-29111: Local unprivileged user can trigger a stack overwriting.
* CVE-2026-40225: Local root execution can occur via malicious hardware
devices and unsanitized kernel output.
* CVE-2026-40226: systemd-nspawn: escape-to-host action can occur via a
crafted optional config file.
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