# UNDF: UNDF-2026-000000547
# systemd 5-MOAD scan — 2026-03-31

Source: https://github.com/systemd/systemd (depth=1)
Focus: src/core/, src/resolve/, src/cryptsetup/, src/login/

Prior defects in this directory:
- systemd-0001: strv_extend_strv dedup O(N²) (src/basic/strv.c) — HIGH
- systemd-0002: unit_file_get_list states filter O(U×S) (src/shared/install.c) — MEDIUM

## MOAD-0001 (CWE-407): DEFECT — systemd-0003

`src/core/dbus-cgroup.c` BPF filter path setter: `strv_contains(*filters, path)`
called inside a `for(;;)` loop reading D-Bus array elements for
`IPIngressFilterPath=` / `IPEgressFilterPath=` properties. O(N²) total for N
paths. See `systemd-0003-dbus-cgroup-bpf-filter-strv-dedup.patch`.

Same pattern also appears in `src/core/load-fragment.c`
`config_parse_ip_filter_bpf_progs()`. Both sites are LOW-MEDIUM severity
(config/property-write path, not hot packet path).

Other candidates reviewed and found LOW severity or too small in practice:
- `src/core/device.c` LIST_FOREACH + strv_contains(aliases, d->path): called
  on udev hotplug events. aliases list is small (udev SYSTEMD_ALIAS values).
- `src/core/transaction.c` nested LIST_FOREACH: not a membership test, just
  pairwise conflict checking over job sets.

## MOAD-0002 (Intertangle): CLEAN (architectural note)

The `Manager` struct (`src/core/manager.h`, 672 lines) is a god object holding
all systemd state. This is intentional and well-known. The subsystems (device,
mount, swap, service, etc.) all reference it. No novel coupling to patch.
Marked CLEAN.

## MOAD-0003 (Leaked Context): CLEAN

systemd is a single-threaded sd-event loop. No `thread_local`, `__thread`, or
`pthread_getspecific` found in `src/core/` or `src/resolve/`. CLEAN.

## MOAD-0004 (CWE-312 Logged Secret): CLEAN

Reviewed `src/cryptsetup/cryptsetup.c` for LUKS passphrase, volume key, and
TPM key material in log calls. Found only device names and error messages in
`log_debug`/`log_info`/`log_warning` — no passphrase values, no key bytes,
no token secrets. CLEAN.

## MOAD-0005 (Thundering Herd): CLEAN

systemd is a single-threaded sd-event loop. No concurrent hashmap/set access.
CLEAN.