Yu Watanabe [Wed, 20 May 2026 22:34:43 +0000 (07:34 +0900)]
test-network: fix test case for Neighbor Announcement message handling
After 9142bd5a8e9ed94ecbb1e335305e24760b90ad2a, when NA without router
flag is received, the corresponding redirect route and the default route
is removed, but the other routes are kept.
The corresponding test case was not updated by the commit, and the test
case has been unfortunately skipped...
* 3e1930512d Downgrade dependency on dbus to recommends in sd-container
* 61d6ecf0a0 Conflict with sysuser-helper
* fbc4646437 autopkgtest: add dependency on procps
Philip Withnall [Wed, 20 May 2026 16:15:00 +0000 (17:15 +0100)]
updatectl: Add a --no-ask-password argument
While commit 83c1e8ff5f9 added support for interactive polkit
authentication in `updatectl`, some users might want to disable that for
some use cases; so add the standard `--no-ask-password` argument.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: https://github.com/systemd/systemd/issues/37412
Daan De Meyer [Tue, 19 May 2026 10:36:01 +0000 (10:36 +0000)]
ci: run the musl build & test under mkosi with a postmarketOS tools tree
Drop the standalone Unit-tests (musl) workflow that ran on an Alpine sandbox
spun up by jirutka/setup-alpine, and merge it into unit-tests.yml as a new
build-musl job that provisions a postmarketOS tools tree via mkosi and runs
the meson build + test suite through 'mkosi box'. postmarketOS is musl-native,
so the musl-gcc / -idirafter /usr/include wrappers the Fedora tools tree
needed are gone; the linter.yml's own musl build step also goes away since
the unit-tests workflow now covers it (and tests it).
postmarketOS doesn't ship a downstream systemd packaging spec, so the new
tools tree config in mkosi.tools.conf/mkosi.conf.d/postmarketos.conf does not
set PrepareScripts and lists build deps manually. mkosi.sync now early-exits
when PKG_SUBDIR is unset so the missing pkgenv entry doesn't trip set -u.
Co-developed-by: Claude Opus 4.7 <noreply@anthropic.com>
Daan De Meyer [Wed, 20 May 2026 17:21:13 +0000 (17:21 +0000)]
test-path: Skip test when we can't create a cgroup
Instead of having CI runner specific checks, let's just
skip the test if we get EXIT_CGROUP which is what we get
when we can't create a cgroup. This makes the check work
independently of CI runner, and specifically also on github
actions.
Daan De Meyer [Wed, 20 May 2026 12:14:52 +0000 (12:14 +0000)]
ptyfwd: Imply PTY_FORWARD_READ_ONLY if stdin isn't readable
if stdin is connected to a closed pipe or similar, imply
PTY_FORWARD_READ_ONLY so we don't even try to read from it
in the first place. Otherwise we'll immediately get a hangup
which will cause the forwarder to call sd_event_exit() and
shut down the event loop.
Debugged-by: Christian Brauner <brauner@kernel.org>
Yu Watanabe [Wed, 20 May 2026 15:39:47 +0000 (00:39 +0900)]
systemd-udevd: configure NIC IRQs CPU affinity (#40304)
# Context
#40195 defines the initial proposal and the motivation behind this PR.
This PR introduces 3 new options for `.link` files `[Link]` section:
- `IRQAffinityPolicy=`
- `IRQAffinity=`
- `IRQAffinityNUMA=`
The purpose is to allow `systemd-udevd` to configure a NIC's IRQs
affinity to specific CPU(s).
`IRQAffinityPolicy=` supports two policies:
- `single`: assign all the NIC IRQs to CPU 0, or the first CPU in the
CPU set resulting from the union of `IRQAffinity=` and
`IRQAffinityNUMA=`.
- `spread`: assign all the NIC IRQs to all the CPUs (or the union of
`IRQAffinity=` and `IRQAffinityNUMA=` if defined) in a round-robin
fashion while optimizing for cache locally while spreading apart queues
on CPUs as much as possible.
Both `IRQAffinity=` and `IRQAffinityNUMA=` behaves as filters to reduce
the CPU set to assign IRQs to, and are only valid if
`IRQAffinityPolicy=` is defined.
# Spreading IRQs
This section describes the algorithm responsible for spreading IRQs over
different CPUs to maximize performance.
## 1. Discover CPU topology
Read from `/sys/devices/system/cpu/cpu*/topology` to identify:
- L3 cache domains (dies)
- Physical cores VS hyperthreads
- NUMA nodes
- Core ordering within each die
```
Example: Dual-socket server with 2 dies per socket, 4 cores per die
Use only the first hyperthread of each physical core to avoid SMT
contention. Two IRQs on sibling HTs contend for ALU/cache without cache
benefit.
```
Before: CPUs 0-31 (16 cores × 2 HTs)
After: CPUs 0-15 (first HT of each core)
```
## 3. Equidistant permutations
Reorder dies and CPUs so consecutive selections are maximally spread
apart.
```
Original order: [0, 1, 2, 3] (adjacent dies/CPUs)
|
v
Equidistant: [0, 2, 1, 3] (spread apart)
```
This ensures that even if only 2 IRQs are assigned, they land on dies 0
and 2 (not 0 and 1), maximizing physical distance. The permutation is
also applied within each die:
```
Die permutation: Die0 -> Die2 -> Die1 -> Die3
Within each die:
┌───────────────────────────────────────────────┐
│ Die 0: [C0,C1,C2,C3] -> [C0,C2,C1,C3] │
│ Die 1: [C4,C5,C6,C7] -> [C4,C6,C5,C7] │
│ Die 2: [C8,C9,C10,C11] -> [C8,C10,C9,C11] │
│ Die 3: [C12,C13,C14,C15] -> [C12,C14,C13,C15] │
└───────────────────────────────────────────────┘
```
## 4. Round-robin selection across dies
Pick one CPU from each die in rotation, following permuted order.
```
Round 1: Die0->C0 Die2->C8 Die1->C4 Die3->C12
| | | |
v v v v
IRQs: [IRQ0] [IRQ1] [IRQ2] [IRQ3]
Round 2: Die0->C2 Die2->C10 Die1->C6 Die3->C14
| | | |
v v v v
IRQs: [IRQ4] [IRQ5] [IRQ6] [IRQ7]
```
If there are more IRQs than physical cores, this logic wraps around and
reuse CPUs. Only the first hyperthread of each core is used to avoid
cache line contention between queues.
Daan De Meyer [Fri, 15 May 2026 14:59:49 +0000 (14:59 +0000)]
basic/math-util: drop libm where possible
- test-random-util is reworked to not use sqrt()
- pretty-print.c inlines ceil() so libm doesn't have
to be linked into libshared
- We add fno-math-errno to allow inlining of more math
functions by not requiring standard math functions to
set errno on invalid input.
Daan De Meyer [Fri, 15 May 2026 20:46:54 +0000 (20:46 +0000)]
meson: shrink developer-mode build artifacts
Two complementary changes in the developer-mode branch of meson.build:
1. -ffunction-sections -fdata-sections: pair with the existing
-Wl,--gc-sections so the linker can drop unused individual functions
and data instead of being forced to pull whole .o files into each
binary. Biggest impact on statically-linked NSS/PAM modules (a single
call into creds-util.c used to drag in the entire creds-util
translation unit, which transitively pulled TPM2, OpenSSL, PKCS11 and
KDF helpers via tpm2-util.c / openssl-util.c) and on tests that embed
daemon objects via meson's objects: extraction.
2. -gz=zstd + -fdebug-types-section + -Wl,--compress-debug-sections=zstd:
compress every .debug_* section with zstd, and move type DIEs into a
COMDAT-mergeable section so identical types described across many TUs
land once. Both are transparent to GDB / readelf / addr2line.
Gated to mode == 'developer' for now: no major distro (Fedora, Debian/
Ubuntu, Arch, Alpine, Gentoo, openSUSE, Yocto) enables -ffunction-sections
in their system-wide default CFLAGS, and the interaction with -flto=auto +
-ffat-lto-objects (which Fedora et al. ship by default) deserves a broader
evaluation before turning it on for release builds. Developer mode benefits
straightforwardly: smaller plugins, smaller tests, smaller libraries, no
interference with the hardening/LTO flag combinations distros pin.
Size impact on a clean developer-mode build, 626 ELF objects:
The big test wins come from the ~30 daemons (systemd-networkd,
systemd-resolved, systemd-journald, systemd-logind, systemd-homed,
systemd-importd, systemd-machined, …) whose compiled .o files are embedded
directly into their unit tests via meson's objects: extraction mechanism.
With per-function sections on the daemon sources, the test binary can GC
the bulk of code it never exercises; the remaining DWARF is then shared
zstd-compressed across every .o.
Build-speed cost is below noise on a 24-core build: across four clean
builds (with-flags / sections-only / baseline / with-flags rerun) the
range was 23.6–26.0 s real time and 7m39s–7m48s user time, with the
two with-flags runs faster than the baseline by a couple of seconds —
overhead from per-function-section bookkeeping and zstd compression
disappears into parallel-build noise.
Daan De Meyer [Wed, 13 May 2026 21:01:41 +0000 (23:01 +0200)]
repart: canonicalize node in varlink Run method
Run acquire_root_devno() on the varlink-provided node so symlinks (e.g.
/dev/disk/by-id/...) resolve to their canonical /dev/ path before being
used. Without this, sym_fdisk_partname() produces a "-partN" symlink
that udev hasn't created yet when repart calls open() on it right after
BLKPG_ADD_PARTITION, failing with ENOENT.
This also brings the varlink path in line with the CLI path's
partition-to-whole-disk and dm-crypt-to-backing resolution.
Luca Boccassi [Mon, 18 May 2026 11:56:39 +0000 (12:56 +0100)]
po: skip automated fuzzy translations when generating new po files
The fuzzy translations are always wrong, but meson's integration does
not allow skipping them. Add a tiny wrapper for 'msgmerge' to
workaround the issue and skip them when running ninja systemd-update-po
Paul Meyer [Tue, 19 May 2026 11:56:46 +0000 (13:56 +0200)]
vmspawn: use EPYC-v4 cpu for SNP
SNP requires a named, stable CPU model so the launch measurement is
reproducible across hosts. EPYC-v4 is the baseline that covers all
SNP-capable processors (Milan and later).
Paul Meyer [Mon, 18 May 2026 05:50:34 +0000 (07:50 +0200)]
vmspawn: initial support for SEV-SNP guests
Add --confidential-computing=sev-snp to run the guest as an AMD SEV-SNP
confidential VM. Loads a raw OVMF firmware blob via -bios (SNP doesn't
support the pflash + NVRAM split), attaches a sev-snp-guest object,
and hashes the kernel, initrd and cmdline into the launch measurement
when direct kernel boot is used. Incompatible features (Secure Boot,
CXL, virtio-balloon, SMBIOS credentials) are rejected or disabled; an
attached vTPM must be treated as untrusted by the guest.
The feature is marked experimental in the man page.
Co-developed-by: Claude Opus 4.7 <noreply@anthropic.com> Signed-off-by: Paul Meyer <katexochen0@gmail.com>
udev/net: add IRQAffinityNUMA= option for NUMA-aware filtering
Add support for filtering IRQ affinity to CPUs on a specific NUMA node
via the new IRQAffinityNUMA= option in .link files. The option accepts:
- "local": use the NUMA node local to the NIC's PCIe slot
- Explicit node number (0, 1, 2, ...): use CPUs on the specified node
When both IRQAffinity= and IRQAffinityNUMA= are specified, their
intersection is used. If the intersection is empty, an error is logged
and IRQ affinity configuration is skipped.
When "local" is specified but the device's NUMA node cannot be
determined (numa_node shows -1), a warning is logged and IRQ affinity
configuration is skipped.
udev/net: add IRQAffinity= option to filter eligible CPUs
Add IRQAffinity= option to .link files that filters the set of CPUs
eligible for IRQ placement. This works in conjunction with
IRQAffinityPolicy= to constrain which CPUs receive network IRQs.
When specified with spread policy, only the listed CPUs are considered
for IRQ distribution. When specified with single policy, IRQs are
pinned to the first CPU in the allowed set instead of CPU 0.
udev/net: implement IRQAffinityPolicy=spread with topology awareness
Implement the spread policy for IRQ affinity distribution using a
topology-aware algorithm. The algorithm:
1. Discovers CPU topology from sysfs (NUMA node, package, die/L3, core)
2. Groups CPUs by L3 cache domain (die) with equidistant ordering
3. Round-robins across dies, spreading IRQs across the system
4. Uses first hyperthread of each core before second hyperthreads
5. Applies IRQ affinity via /proc/irq/<n>/smp_affinity
When there are more IRQs than CPUs, queues wrap around using round-robin.
udev/net: add IRQAffinityPolicy= option for .link files
Add support for configuring IRQ affinity for network interfaces via
systemd .link files. For now, the new IRQAffinityPolicy= option in the [Link]
section only accepts "single", which pins all MSI IRQs to CPU 0.
This allows declarative IRQ affinity configuration for network devices
during udev processing, which is useful for optimizing network
performance on multi-core systems.
Further commits will expand the options supported by IRQAffinityPolicy=.
Frantisek Sumsal [Wed, 20 May 2026 08:47:22 +0000 (10:47 +0200)]
dns-packet: bail out early if the packet is too short
Let's bail out early if the packet claims to contain some
questions or answer RRs, but the remaining packet data size is not
enough to hold a single such entry.
Daan De Meyer [Thu, 14 May 2026 19:20:02 +0000 (19:20 +0000)]
test: add test-link-abi to enforce link-time ABI invariants
For every built executable, internal shared library, and plugin module,
verify two link-time properties via readelf:
1. No imported GLIBC symbol's version is newer than 2.34.
2. The dynamic section's NEEDED entries reference only glibc, the
runtime linker, our own libraries.
Daan De Meyer [Fri, 15 May 2026 12:16:01 +0000 (12:16 +0000)]
tree-wide: Replace exp10() with our own impl
exp10() has a symbol version > 2.34 on latest glibc. To allow
dropping our baseline required glibc runtime version to <= 2.34,
let's add our own version to prevent pulling in the newer symbol
from glibc.
- `io.systemd.Job.List` — list all queued jobs or look up by `id`/`unit`
name, with streaming support. Uses context/runtime split: `JobContext`
(Unit, JobType) and `JobRuntime` (Id, State, Result,
ActivationDetails). Follows the same SELinux and parameter-conflict
patterns as `io.systemd.Unit.List`.
- `io.systemd.Job.Cancel` — cancel a specific job by ID, with SELinux
and polkit authorization.
- `io.systemd.Job.ClearAll` — cancel all pending jobs, with SELinux and
polkit authorization.
Patrick Rohr [Mon, 4 May 2026 20:31:10 +0000 (13:31 -0700)]
networkd: fix race condition in per-interface ICMPv6 processing
There exists a small window of time in icmp6_bind() between creating the
ICMPv6 socket and binding it to an ifindex, where the link-scoped socket
can process an ICMPv6 packet received on any interface. The applies to
both sd-radv and sd-ndisc codepaths.
This change adds an explicit check for ifindex on the receive path and
ignores packets received on other interfaces.
Yu Watanabe [Wed, 20 May 2026 01:22:32 +0000 (10:22 +0900)]
sd-bus: add depth limit to message_skip_fields() to prevent stack overflow (#42164)
`message_skip_fields()` recursively processes D-Bus variant types in
message header fields with no depth limit. A crafted message with deeply
nested variants can cause unbounded recursion and overflow the stack.
Add a `depth` parameter checked against `BUS_CONTAINER_DEPTH` (128),
matching the limit already enforced by the public
`sd_bus_message_skip()` API. All recursive call sites pass `depth + 1`,
and the top-level caller in `message_parse_fields()` passes `0`.
Michael Vogt [Tue, 19 May 2026 18:32:41 +0000 (20:32 +0200)]
core: improve errors from varlink io.systemd.Unit.StartTransient
The existing error reporting for the varlink `StartTransient` code
was converting all errors into `VARLINK_ERROR_UNIT_BAD_SETTING`.
This is not correct in some cases, we need to have a more targted
pattern here, i.e. only convert EINVAL to VARLINK_ERROR_UNIT_BAD_SETTING
and otherwise return the matching varlink error from the errno instead.
This commit fixes this issue. Thanks to Ivan Kruglov for raising
this.
Yu Watanabe [Wed, 20 May 2026 01:08:11 +0000 (10:08 +0900)]
tree-wide: move static dl handles into their dlopen_*() functions (#42168)
Each dlopen_*() wrapper kept its dl handle as a file-scope
'static void *xxx_dl = NULL;' even though only the wrapper itself
ever referenced it. Move each one inside the corresponding function
so its scope matches its actual use, leaving the rest of each
translation unit free of the unused file-scope name.
In pcre2-util.c the assert(pcre2_dl) in pattern_matches_and_log()
becomes assert(sym_pcre2_match), which carries the same invariant
(pattern_compile_and_log() ran dlopen_pcre2()).
Luca Boccassi [Tue, 19 May 2026 21:42:25 +0000 (22:42 +0100)]
test: switch TEST-55-OOMD stress-ng --vm-method to lfsr32
Commit 881e4717c7 ("test: pin stress-ng --vm-method to a portable
scalar method in TEST-55-OOMD") pinned --vm-method=zero-one with the
rationale that it is "a long-standing scalar method". That rationale is
wrong: stress_vm_zero_one() in stress-ng's stress-vm.c is declared
i.e. it carries the exact same TARGET_CLONES attribute as 33 of the 35
other vm methods. On x86_64 with GCC >=5, TARGET_CLONES expands (see
core-target-clones.h in stress-ng) to a target_clones attribute
including "arch=skylake-avx512", "arch=cooperlake", "arch=tigerlake",
"arch=sapphirerapids", and several other AVX-512-bearing arch variants,
plus "default". GCC generates AVX-512 clones of stress_vm_zero_one() and
the IFUNC resolver picks them on any CPU that advertises AVX-512.
The only vm methods in stress-ng's registry whose function definitions
omit TARGET_CLONES entirely (and are therefore guaranteed not to
dispatch to an AVX-512 clone) are lfsr32 (portable, always registered)
and write64ds (x86_64-only, gated on HAVE_ASM_X86_MOVDIRI, i.e. Intel
Tremont / Tiger Lake+ MOVDIRI instruction).
Switch the four stress-ng --vm invocations in TEST-55-OOMD to
--vm-method=lfsr32 so the AVX-512 SIGILL on CPUs without AVX-512 (e.g.
AMD Zen 1-3) can no longer occur regardless of compiler version,
optimization level, or stress-ng package build.
Luca Boccassi [Tue, 19 May 2026 21:00:58 +0000 (22:00 +0100)]
test: fix race in TEST-07-PID1.socket-on-failure.sh
The test waited for the OnFailure= service's filesystem side effect
(`rmdir` of the directory) and then immediately invoked
`systemctl is-active`. Between `rmdir(2)` returning (which causes the
shell loop to exit) and PID1 reaping the child and transitioning the
oneshot service from `activating` to `active`, there is a small window
where `is-active` can observe `activating` and fail the test.
Wait directly on the unit state instead, matching the pattern used a
few lines above for the `is-failed` case.
TristanInSec [Tue, 19 May 2026 21:33:11 +0000 (17:33 -0400)]
test: add test for variant recursion depth limit in message_skip_fields()
Craft a raw D-Bus message with an unknown header field containing
BUS_CONTAINER_DEPTH+1 nested variants and verify that message parsing
rejects it with -EBADMSG rather than recursing until stack overflow.
TristanInSec [Tue, 19 May 2026 21:33:06 +0000 (17:33 -0400)]
sd-bus: add depth limit to message_skip_fields() to prevent stack overflow
message_skip_fields() recurses for each nested variant ('v') type in
D-Bus message header fields. A crafted message with deeply nested
variants (e.g., a variant containing a variant containing a variant...)
causes unbounded stack growth, leading to stack overflow and crash.
Add a depth parameter that increments on each recursive call and
rejects messages exceeding BUS_CONTAINER_DEPTH with -EBADMSG. This
matches the existing depth limits enforced elsewhere in the sd-bus
message processing (e.g., bus_message_enter_container).
Daan De Meyer [Sat, 16 May 2026 19:09:12 +0000 (19:09 +0000)]
tools: add a test wrapper that replays crashing tests under gdb
meson test --wrapper hook to print a gdb backtrace inline in the test
log when a test exits with an actual crash signal (SIGSEGV, SIGABRT,
SIGBUS, SIGFPE, SIGILL). Wired into the default add_test_setup() so it
runs automatically on every `meson test`.
Environmental terminations (SIGTERM/SIGKILL/SIGPIPE/SIGALRM) are passed
through without replay, and the original signal is re-raised so the
parent's wait() observes WIFSIGNALED rather than a plain exit code.
Daan De Meyer [Sat, 16 May 2026 15:50:31 +0000 (15:50 +0000)]
tree-wide: move static dl handles into their dlopen_*() functions
Each dlopen_*() wrapper kept its dl handle as a file-scope
'static void *xxx_dl = NULL;' even though only the wrapper itself
ever referenced it. Move each one inside the corresponding function
so its scope matches its actual use, leaving the rest of each
translation unit free of the unused file-scope name.
In pcre2-util.c the assert(pcre2_dl) in pattern_matches_and_log()
becomes assert(sym_pcre2_match), which carries the same invariant
(pattern_compile_and_log() ran dlopen_pcre2()).
Yu Watanabe [Tue, 19 May 2026 18:33:15 +0000 (03:33 +0900)]
udev: predictable names for auxiliary sub-function (SF) devices (#42154)
Some drivers (currently mlx5_core) expose sub-functions (SFs) of a PCI
Physical or Virtual Function as auxiliary devices that carry a stable
`sfnum` sysfs attribute (the user-defined SF number passed to `devlink
port add ... sfnum N`). Their leaf devices (net, infiniband, ...)
currently inherit the parent PF/VF's `ID_PATH` and the SF netdev falls
through to the kernel-assigned `eth<N>` name.
Two patches:
1. `udev-builtin-path_id`: prepend an `sf-<N>` token when the walk
crosses an aux device with `sfnum`, so SF leaf devices get an `ID_PATH`
distinct from the parent PF/VF (e.g. `pci-0000:c1:00.0-sf-88`). Aux
devices without `sfnum` keep the pre-patch behaviour, so existing
`ID_PATH` values are unchanged and the patch needs no naming-scheme gate
(path_id is unversioned).
2. `udev-builtin-net_id`: name SF host netdevs analogously to SR-IOV VF
host netdevs — walk to the parent PCI function and append a
single-character `S<sfnum>` suffix. SFs hosted on SR-IOV VFs (VF-SF) get
both suffixes chained on the PF's base name (`enp193s0f0v0S88`). Gated
behind `NAMING_SUBFUNC` / `NAMING_V261`. Man page
(`systemd.net-naming-scheme(7)`) updated.
The patches apply to any driver that exposes its SF leaf devices below
an aux device exposing `sfnum`.
Validated on mlx5 hardware: PF, VF, SF-on-PF (`enp8s0f0S88`,
`pci-0000:08:00.0-sf-88`). VF-SF case verified with a fake-sysfs setup
since this is not supported by any real device and is more a theoretical
use case.
* 77fce77807 apk: Implement repository_key_fetch for the postmarketOS distribution
* 7068ed49ab postmarketos: Add ruff to tools tree
* dea4b6bfc8 Add newline when writing machine id into /etc/machine-id
* 944b775d40 tools: add libtss2-tcti-device0 to opensuse tools tree
* d856d65d3b mkosi-initrd: Also add cryptsetup-libs explicitly to the initrd
* 1cc967c5b3 mkosi-initrd: Trim orphaned GPU/audio modules, add ACPI platform attrs
* a3e95a7c29 mkosi-tools: Add fish to misc profile
* 76b02d1f84 mkosi-tools: Add jujutsu to misc profile
* 0afe4cd254 mkosi-tools: Move gh to misc profile
* 9077634bad mkosi-tools: Add cryptsetup-libs to centos/fedora/opensuse
* 82846347af box: Drop background tinting
* 3e50b97101 mkosi-tools: Add libfido2
* 78c2784827 vmspawn: Use --ephemeral rather than copy_ephemeral()
* dc801b00a3 Added second call to update kerneltype after kernel is defined
* 0c5cc04a8b vmspawn: Forward journal-remote settings to vmspawn
* 2518468c65 nspawn: Use --forward-journal instead of running journal-remote ourselves
* d2b798d00c apk: skip removal of packages that aren't installed
Frantisek Sumsal [Tue, 19 May 2026 12:51:56 +0000 (14:51 +0200)]
resolve: cap pre-allocation for questions/RRs
Since [0] and [1] questions & answer RRs from the incoming packets are
parsed into a hashmap to speed things up. The hashmaps are even
pre-allocated to speed things up even more, but there's one caveat - the
size for the pre-allocation comes from one or more fields from the
incoming packets that are under sender's control.
This can be abused by a malicious DNS server which can send a packet
with a spoofed QDCOUNT (for question packets) or ANCOUNT/NSCOUNT/ARCOUNT
(for answer packets). The limit of the final value in both cases is 64K.
This value is then used to pre-allocate the hashmap (via
set_reserve()/ordered_set_reserve(), where the caller also multiplies
the input value by 2 in both cases), which in turns calls
resize_buckets() that memzero()s the pre-allocated area, so all the
pages are faulted in, showing in process' RSS. Each such spoofed packet
then can translate into a ~4 MiB allocation in the systemd-resolved
process, which doesn't sound that bad.
However, this can be further amplified if the spoofed packet ends up in
resolved's cache. So, if the spoofed packet contains one valid A record
and then an OPT record with a spoofed ARCOUNT, the whole packet ends up
in the cache that can hold 4K of entries, which can eventually cause
resolved to keep up to 16 GiB of memory just for the cache (and thanks
to the memzero() above it's all RSS). Note that all this requires
someone with enough privileges to configure resolved to actually point
to such malicious DNS server or it could come from a malicious DHCP
server on the network. This could also get exploited via LLMNR, but in
thas case an attacker would have to match an ID of a valid transaction
for the packet to end up in resolved's cache.
For example, with a malicious DNS already in resolved configuration:
$ resolvectl dns eth0
Link 2 (eth0): 192.168.99.1:5354
Filling resolved's cache:
$ for i in {0..4200}; do resolvectl query test-$i.example.com; done
...
test-4200.example.com: 192.0.2.1 -- link: dummy0
-- Information acquired via protocol DNS in 1.6ms.
-- Data is authenticated: no; Data was acquired via local or encrypted transport: no
-- Data from: network
In my testing I also noticed one annoyance - after certain threshold the
RSS increase persisted even after the malicious entries were evicted
from the cache (or flushed via `resolvectl flush-caches`). This was most
likely due to mmap_threshold getting bumped to > 4 MiB and neither cache
eviction nor flush-caches call malloc_trim(0) (via
sd_event_trim_memory() or similar).
To mitigate this, let's cap the pre-allocation to a maximum number of
records the given packet body can realistically contain. If the minimum
size would be, for whatever unlikely reason, not enough, nothing serious
would happen - the hashmap would still get resized automatically by
resize_buckets(), it'd be just slightly slower.
Yu Watanabe [Tue, 19 May 2026 18:10:40 +0000 (03:10 +0900)]
systemd-coredump: add COREDUMP_CODE (#42019)
Add COREDUMP_CODE to the fields captured by systemd-coredump. This makes
it possible for system administrators to filter coredumps based on si_code,
which describes the reason why a given signal was sent.
For example, to find processes killed due to invalid permissions
(SEGV_ACCERR):
$ journalctl COREDUMP_SIGNAL=11 COREDUMP_CODE=2
I've decided to add the value of si_code to the 'Signal: ' line of
coredumpctl info:
Signal: 11 (SEGV) si_code: SEGV_ACCERR
Allow users to allow DHCPv6 unreachable/blackhole routes (installed
for delegated prefixes) into a specific routing table, analogous to
the existing RouteTable= in [DHCPv4] and [IPv6AcceptRA].
The config parser config_parse_dhcp_or_ra_route_table() is extended
with an AF_UNSPEC ltype discriminator for DHCPv6 (AF_INET6 is already
taken by NDISC/RA). link_get_dhcp6_route_table() follows the same
pattern as link_get_dhcp4_route_table() and link_get_ndisc_route_table(),
falling back to the VRF table when not explicitly set.
In dhcp_request_unreachable_route(), the table is applied only for
NETWORK_CONFIG_SOURCE_DHCP6 routes (the uplink unreachable aggregates),
not DHCP_PD routes (per-subnet routes on downstream interfaces), matching
the intent of the feature. The !route->table_set guard avoids overriding
a table already set by the route code.
dependabot[bot] [Tue, 19 May 2026 15:08:45 +0000 (15:08 +0000)]
build(deps): bump the actions group with 2 updates
Bumps the actions group with 2 updates: [github/codeql-action](https://github.com/github/codeql-action) and [aws-actions/configure-aws-credentials](https://github.com/aws-actions/configure-aws-credentials).
Updates `github/codeql-action` from 4.35.2 to 4.35.4
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/github/codeql-action/compare/95e58e9a2cdfd71adc6e0353d5c52f41a045d225...68bde559dea0fdcac2102bfdf6230c5f70eb485e)
Updates `aws-actions/configure-aws-credentials` from 6.1.0 to 6.1.1
- [Release notes](https://github.com/aws-actions/configure-aws-credentials/releases)
- [Changelog](https://github.com/aws-actions/configure-aws-credentials/blob/main/CHANGELOG.md)
- [Commits](https://github.com/aws-actions/configure-aws-credentials/compare/ec61189d14ec14c8efccab744f656cffd0e33f37...d979d5b3a71173a29b74b5b88418bfda9437d885)
Luca Boccassi [Tue, 19 May 2026 16:53:11 +0000 (17:53 +0100)]
Translations update from Fedora Weblate (#42181)
Translations update from [Fedora
Weblate](https://translate.fedoraproject.org) for
[systemd/main](https://translate.fedoraproject.org/projects/systemd/main/).
Luca Boccassi [Tue, 19 May 2026 10:29:58 +0000 (11:29 +0100)]
test: pin stress-ng --vm-method to a portable scalar method in TEST-55-OOMD
The stress-ng "vm" stressor's default --vm-method=all cycles through every
VM stress method, including newer ones that use AVX-512 instructions. On
CPUs without AVX-512 support (e.g. AMD Zen 1 to 3) those methods crash with
SIGILL. In testcase_oom_rulesets_lasting_sec all 10 stress-ng workers die
within ~2.34 seconds, so by the time the 6 second sleep elapses the unit
is already in failed/exit-code state and the assert_eq for
ActiveState=active trips.
Pin --vm-method=zero-one, a long-standing scalar method, on all four
stress-ng --vm invocations in this test (the two transient services in
testcase_oom_rulesets and testcase_oom_rulesets_lasting_sec, plus
TEST-55-OOMD-testbloat.service and TEST-55-OOMD-testmunch.service) so the
workers do not crash on AVX-512-less CPUs. testbloat, testmunch and
testcase_oom_rulesets have not been observed failing because they get
OOM-killed by systemd-oomd within ~1 to 2 seconds, before stress-ng cycles
into an AVX-512 method, but they share the same latent flake.
Journal excerpts from the failing run, TEST-55-OOMD-slowrule.service in
testcase_oom_rulesets_lasting_sec (journalctl -o short-monotonic):
[ 58.018676] stress-ng[1015]: invoked with '/usr/bin/stress-ng --timeout 15s --vm 10 --vm-bytes 50M --vm-keep' by user 0 'root'
[ 59.866072] stress-ng[1030]: stress-ng: debug: [1030] caught SIGILL, address 0x000055bd8d609140 (ILL_ILLOPN)
[ 59.921050] stress-ng[1030]: stress-ng: debug: [1030] stress-ng: info: 0x000055bd8d609140:<62>71 fd 48 6f 2d 36 14 1c 00 c5 d1 ef ed 49 29
[ 59.929310] stress-ng[1015]: stress-ng: error: [1015] vm: [1021] terminated with an error, exit status=2 (stressor failed)
[ 60.364111] stress-ng[1015]: stress-ng: info: [1015] failed: 10: vm (10)
[ 60.364493] stress-ng[1015]: stress-ng: info: [1015] unsuccessful run completed in 2.34 secs
[ 60.371290] systemd[1]: TEST-55-OOMD-slowrule.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
[ 60.371396] systemd[1]: TEST-55-OOMD-slowrule.service: Failed with result 'exit-code'.
[ 64.017061] TEST-55-OOMD.sh[1010]: + assert_eq failed active
[ 64.018167] TEST-55-OOMD.sh[1039]: FAIL: expected: 'active' actual: 'failed'
The faulting bytes marked by stress-ng with <62> (the byte at the
instruction pointer) decode unambiguously to an AVX-512 VMOVDQA64 using
the 512-bit zmm13 register, confirmed independently by two disassemblers:
The leading 0x62 is the EVEX prefix (exclusive to AVX-512 on this target),
zmm13 is a 512-bit register that only exists when AVX-512 is implemented,
and VMOVDQA64 requires the AVX512F (Foundation) CPUID feature (Intel SDM
Vol 2C). Executing this on a CPU without AVX-512 raises #UD, delivered by
the kernel as SIGILL/ILL_ILLOPN, matching the journal entry above. The
same journal shows the kernel reporting "kvm_amd: TSC scaling supported",
i.e. the guest is on AMD KVM, and AMD did not ship AVX-512 before Zen 4.
Co-developed-by: Claude Opus 4.7 <noreply@anthropic.com>
Jiri Pirko [Thu, 7 May 2026 14:52:02 +0000 (16:52 +0200)]
udev-builtin-net_id: name auxiliary sub-function (SF) host network devices
Some drivers (currently mlx5_core) expose sub-functions (SFs) of a PCI
Physical Function as auxiliary devices. Each SF carries a host network
interface that sits below the aux device in sysfs:
Because the network device's immediate parent is the aux device and not
a PCI device, names_pci() bails out and these interfaces fall through
to the kernel-assigned eth<N> name, which is not stable across reboots,
module reloads or topology changes.
The naming applies when the SF network device's direct sysfs parent is
the aux device that exposes sfnum, i.e. the kernel driver passes the
aux device to SET_NETDEV_DEV(). mlx5_core does so. ice's
ice_sf_cfg_netdev() currently passes the parent PF's PCI device, so ice
SF network devices sit as siblings of the PF rather than below the aux
device and fall outside this precondition; pending a kernel change in
ice to mirror mlx5's SET_NETDEV_DEV(netdev, &adev->dev), they continue
to receive the kernel-assigned name as they do today.
The aux device exposes 'sfnum', the user-defined sub-function number
(the value passed to "devlink port add ... sfnum N"), which is stable
and unique within its parent PF. The aux device's direct sysfs parent
is the PF's PCI device.
Treat an SF host network device analogously to an SR-IOV VF host
network device: walk to the parent PCI function, derive the base name
from there, then append a single-character "S<sfnum>" suffix. Lowercase
's' is already taken (slot) and the existing grammar uses one character
per token, so 'S' is the best option.
E.g. for an SF whose parent PF is at PCI 0000:c1:00.0 and which was
added with "sfnum 88":
This is parallel to how SR-IOV VFs get a "v<N>" suffix on top of the
parent PF's name.
Gate the new behaviour behind NAMING_SUBFUNC and NAMING_V261. Document
the new suffix in both the ID_NET_NAME_SLOT and ID_NET_NAME_PATH
grammars in systemd.net-naming-scheme(7) and add a v261 history entry.
Co-developed-by: Claude Opus 4.7 <noreply@anthropic.com>
Jiri Pirko [Mon, 11 May 2026 10:58:05 +0000 (12:58 +0200)]
udev-builtin-path_id: emit 'sf-<N>' token for auxiliary sub-functions
Some drivers expose sub-functions (SFs) of a PCI Physical or Virtual
Function as auxiliary devices that carry a stable 'sfnum' sysfs
attribute — the user-defined sub-function number (e.g. the value
passed to "devlink port add ... sfnum N"). The SF's leaf devices
(uverbs, infiniband, net, ...) sit below this aux device in sysfs:
/sys/devices/.../<PF or VF BDF>/<sf aux>/.../<leaf>
Currently path_id walks straight past the aux device, so all leaf
devices below an SF end up sharing ID_PATH=pci-<BDF> with their
parent PF or VF. For uverbs this causes a /dev/infiniband/by-path/
symlink collision, and for any other consumer of ID_PATH/ID_PATH_TAG
it makes PF and SF (or VF and VF-SF) indistinguishable.
Recognise the 'auxiliary' subsystem in path_id's walk: when the aux
device exposes 'sfnum', prepend an 'sf-<N>' token; otherwise leave
it untokenised. The result for an SF whose parent PF is at PCI
0000:c1:00.0 and which was added with "sfnum 88" is:
This is parallel to how net_id's NAMING_SUBFUNC scheme appends 'S<N>'
on top of the PF base name. Aux devices without 'sfnum' keep the
pre-patch behaviour: the walk skips over them with no token. Existing
ID_PATH values for PF and VF leaf devices are therefore unchanged,
the change is purely additive, and there is no need to gate it behind
a naming scheme (path_id itself is unversioned).
Co-developed-by: Claude Opus 4.7 <noreply@anthropic.com>
fstab-generator: fix spurious quota warning for xfs
Filesystems like xfs, btrfs, gfs2 and ocfs2 handle quotas internally
and do not need external quotacheck/quotaon services. When usrquota or
grpquota mount options are used in fstab for these filesystems,
generator_hook_up_quotacheck() falls through to the !fstype_needs_quota()
branch and emits a misleading warning that quotas are "not supported"
when they actually work fine — the kernel handles them internally.
Add fstype_has_internal_quota() to return early with a debug message,
and adopt a tri-state return convention so the caller skips quotaon
when quotacheck was not needed.
The buggy code path was introduced in #24824 and #24880.
Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>