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4f30d00a1cb9ea646239d8697d8312c99325b635
SKELETONKEY/Makefile
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leviathan 4f30d00a1c core/host: shared host fingerprint refactor 
Adds core/host.{h,c} — a single struct skeletonkey_host populated once
at startup and handed to every module callback via ctx->host. Replaces
the per-detect uname / /etc/os-release / sysctl / userns-fork-probe
calls scattered across the corpus with O(1) cached lookups, and gives
the dispatcher one consistent view of the host.

What's in the fingerprint:

- Identity: kernel_version (parsed from uname.release), arch (machine),
  nodename, distro_id / distro_version_id / distro_pretty (parsed once
  from /etc/os-release).
- Process state: euid, real_uid (defeats userns illusion via
  /proc/self/uid_map), egid, username, is_root, is_ssh_session.
- Platform family: is_linux, is_debian_family, is_rpm_family,
  is_arch_family, is_suse_family (file-existence checks once).
- Capability gates (Linux): unprivileged_userns_allowed (live
  fork+unshare probe), apparmor_restrict_userns,
  unprivileged_bpf_disabled, kpti_enabled, kernel_lockdown_active,
  selinux_enforcing, yama_ptrace_restricted.
- System services: has_systemd, has_dbus_system.

Wiring:

- core/module.h forward-declares struct skeletonkey_host and adds the
  pointer to skeletonkey_ctx. Modules opt-in by including
  ../../core/host.h.
- core/host.c is fully POD (no heap pointers) — uses a single file-
  static instance, returns a stable pointer on every call. Lazily
  populated on first skeletonkey_host_get().
- skeletonkey.c calls skeletonkey_host_get() at main() entry, stores
  in ctx.host before any register_*() runs.
- cmd_auto's bespoke distro-fingerprint code (was an inline
  read_os_release helper) is replaced with skeletonkey_host_print_banner(),
  which emits a two-line banner of identity + capability gates.

Migrations:

- dirtydecrypt: kernel_version_current() -> ctx->host->kernel.
- fragnesia: removed local fg_userns_allowed() fork-probe in favour of
  ctx->host->unprivileged_userns_allowed (no per-scan fork). Also
  pulls kernel from ctx->host. The PRECOND_FAIL message now notes
  whether AppArmor restriction is on.
- pack2theroot: access('/etc/debian_version') -> ctx->host->is_debian_family;
  also short-circuits when ctx->host->has_dbus_system is false (saves
  the GLib g_bus_get_sync attempt on systems without system D-Bus).
- overlayfs: replaced the inline is_ubuntu() /etc/os-release parser
  with ctx->host->distro_id comparison. Local helper preserved for
  symmetry / standalone builds.

Documentation: docs/ARCHITECTURE.md gains a 'Host fingerprint'
section describing the struct, the opt-in include pattern, and
example detect() usage. ROADMAP --auto accuracy log notes the
landing and flags remaining modules as an incremental follow-up.

Build verification:

- macOS (local): make clean && make -> Mach-O x86_64, 31 modules,
  banner prints with distro=?/? (no /etc/os-release).
- Linux (docker gcc:latest + libglib2.0-dev): make clean && make ->
  ELF 64-bit, 31 modules. Banner prints with kernel + distro=debian/13
  + 7 capability gates. dirtydecrypt correctly says 'predates the
  rxgk code added in 7.0'; fragnesia PRECOND_FAILs with
  '(host fingerprint)' annotation; pack2theroot PRECOND_FAILs on
  no-DBus; overlayfs reports 'not Ubuntu (distro=debian)'.
2026-05-22 23:18:00 -04:00

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Makefile
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# SKELETONKEY — top-level Makefile (Phase 1)
#
# Builds one binary `skeletonkey` linked from:
# - core/ module interface + registry
# - modules/<f>/ one family per subdir, contributes objects to the
# final binary
# - skeletonkey.c top-level dispatcher
#
# Each family is currently flat (Phase 1 keeps copy_fail_family's
# absorbed DIRTYFAIL source in modules/copy_fail_family/src/).
# Future families register the same way: add their register_* call to
# skeletonkey.c's main() and add their src dir to MODULE_DIRS below.
CC ?= gcc
CFLAGS ?= -O2 -Wall -Wextra -Wno-unused-parameter -Wno-pointer-arith \
-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
LDFLAGS ?=
BUILD := build
BIN := skeletonkey
# core/
CORE_SRCS := core/registry.c core/kernel_range.c core/offsets.c core/finisher.c core/host.c
CORE_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CORE_SRCS))
# Family: copy_fail_family
# All DIRTYFAIL .c files contribute; skeletonkey_modules.c is the bridge.
CFF_DIR := modules/copy_fail_family
CFF_SRCS := $(wildcard $(CFF_DIR)/src/*.c) $(CFF_DIR)/skeletonkey_modules.c
# Filter out the original dirtyfail.c (its main() conflicts with skeletonkey.c's main).
CFF_SRCS := $(filter-out $(CFF_DIR)/src/dirtyfail.c, $(CFF_SRCS))
CFF_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CFF_SRCS))
# Family: dirty_pipe (single-CVE family, no shared infrastructure)
DP_DIR := modules/dirty_pipe_cve_2022_0847
DP_SRCS := $(DP_DIR)/skeletonkey_modules.c
DP_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(DP_SRCS))
# Family: entrybleed (single-CVE family, x86_64 only)
EB_DIR := modules/entrybleed_cve_2023_0458
EB_SRCS := $(EB_DIR)/skeletonkey_modules.c
EB_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(EB_SRCS))
# Family: pwnkit (userspace polkit bug, not kernel)
PK_DIR := modules/pwnkit_cve_2021_4034
PK_SRCS := $(PK_DIR)/skeletonkey_modules.c
PK_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(PK_SRCS))
# Family: nf_tables (CVE-2024-1086)
NFT_DIR := modules/nf_tables_cve_2024_1086
NFT_SRCS := $(NFT_DIR)/skeletonkey_modules.c
NFT_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(NFT_SRCS))
# Family: overlayfs (CVE-2021-3493)
OVL_DIR := modules/overlayfs_cve_2021_3493
OVL_SRCS := $(OVL_DIR)/skeletonkey_modules.c
OVL_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(OVL_SRCS))
# Family: cls_route4 (CVE-2022-2588)
CR4_DIR := modules/cls_route4_cve_2022_2588
CR4_SRCS := $(CR4_DIR)/skeletonkey_modules.c
CR4_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CR4_SRCS))
# Family: dirty_cow (CVE-2016-5195) — requires -pthread
DCOW_DIR := modules/dirty_cow_cve_2016_5195
DCOW_SRCS := $(DCOW_DIR)/skeletonkey_modules.c
DCOW_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(DCOW_SRCS))
# Family: ptrace_traceme (CVE-2019-13272)
PTM_DIR := modules/ptrace_traceme_cve_2019_13272
PTM_SRCS := $(PTM_DIR)/skeletonkey_modules.c
PTM_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(PTM_SRCS))
# Family: netfilter_xtcompat (CVE-2021-22555)
NXC_DIR := modules/netfilter_xtcompat_cve_2021_22555
NXC_SRCS := $(NXC_DIR)/skeletonkey_modules.c
NXC_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(NXC_SRCS))
# Family: af_packet (CVE-2017-7308)
AFP_DIR := modules/af_packet_cve_2017_7308
AFP_SRCS := $(AFP_DIR)/skeletonkey_modules.c
AFP_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(AFP_SRCS))
# Family: fuse_legacy (CVE-2022-0185)
FUL_DIR := modules/fuse_legacy_cve_2022_0185
FUL_SRCS := $(FUL_DIR)/skeletonkey_modules.c
FUL_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(FUL_SRCS))
# Family: stackrot (CVE-2023-3269)
STR_DIR := modules/stackrot_cve_2023_3269
STR_SRCS := $(STR_DIR)/skeletonkey_modules.c
STR_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(STR_SRCS))
# Family: af_packet2 (CVE-2020-14386) — same family as af_packet
AFP2_DIR := modules/af_packet2_cve_2020_14386
AFP2_SRCS := $(AFP2_DIR)/skeletonkey_modules.c
AFP2_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(AFP2_SRCS))
# Family: cgroup_release_agent (CVE-2022-0492)
CRA_DIR := modules/cgroup_release_agent_cve_2022_0492
CRA_SRCS := $(CRA_DIR)/skeletonkey_modules.c
CRA_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CRA_SRCS))
# Family: overlayfs_setuid (CVE-2023-0386) — joins overlayfs family
OSU_DIR := modules/overlayfs_setuid_cve_2023_0386
OSU_SRCS := $(OSU_DIR)/skeletonkey_modules.c
OSU_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(OSU_SRCS))
# Family: nft_set_uaf (CVE-2023-32233)
NSU_DIR := modules/nft_set_uaf_cve_2023_32233
NSU_SRCS := $(NSU_DIR)/skeletonkey_modules.c
NSU_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(NSU_SRCS))
# Family: af_unix_gc (CVE-2023-4622)
AUG_DIR := modules/af_unix_gc_cve_2023_4622
AUG_SRCS := $(AUG_DIR)/skeletonkey_modules.c
AUG_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(AUG_SRCS))
# Family: nft_fwd_dup (CVE-2022-25636)
NFD_DIR := modules/nft_fwd_dup_cve_2022_25636
NFD_SRCS := $(NFD_DIR)/skeletonkey_modules.c
NFD_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(NFD_SRCS))
# Family: nft_payload (CVE-2023-0179)
NPL_DIR := modules/nft_payload_cve_2023_0179
NPL_SRCS := $(NPL_DIR)/skeletonkey_modules.c
NPL_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(NPL_SRCS))
SAM_DIR := modules/sudo_samedit_cve_2021_3156
SAM_SRCS := $(SAM_DIR)/skeletonkey_modules.c
SAM_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(SAM_SRCS))
SEQ_DIR := modules/sequoia_cve_2021_33909
SEQ_SRCS := $(SEQ_DIR)/skeletonkey_modules.c
SEQ_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(SEQ_SRCS))
SUE_DIR := modules/sudoedit_editor_cve_2023_22809
SUE_SRCS := $(SUE_DIR)/skeletonkey_modules.c
SUE_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(SUE_SRCS))
VMW_DIR := modules/vmwgfx_cve_2023_2008
VMW_SRCS := $(VMW_DIR)/skeletonkey_modules.c
VMW_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(VMW_SRCS))
# Family: dirtydecrypt (CVE-2026-31635) — rxgk page-cache write
DDC_DIR := modules/dirtydecrypt_cve_2026_31635
DDC_SRCS := $(DDC_DIR)/skeletonkey_modules.c
DDC_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(DDC_SRCS))
# Family: fragnesia (CVE-2026-46300) — XFRM ESP-in-TCP page-cache write
FGN_DIR := modules/fragnesia_cve_2026_46300
FGN_SRCS := $(FGN_DIR)/skeletonkey_modules.c
FGN_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(FGN_SRCS))
# Family: pack2theroot (CVE-2026-41651) — PackageKit TOCTOU userspace LPE.
# Needs GLib/GIO for D-Bus; the build autodetects via `pkg-config gio-2.0`.
# When absent (e.g. no libglib2.0-dev on the build host), the module
# compiles as a stub that returns PRECOND_FAIL with a hint to install
# the dev package and rebuild.
P2TR_DIR := modules/pack2theroot_cve_2026_41651
P2TR_SRCS := $(P2TR_DIR)/skeletonkey_modules.c
P2TR_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(P2TR_SRCS))
P2TR_GIO_OK := $(shell pkg-config --exists gio-2.0 2>/dev/null && echo 1 || echo 0)
ifeq ($(P2TR_GIO_OK),1)
P2TR_CFLAGS := $(shell pkg-config --cflags gio-2.0) -DPACK2TR_HAVE_GIO
P2TR_LIBS := $(shell pkg-config --libs gio-2.0)
else
P2TR_CFLAGS :=
P2TR_LIBS :=
endif
# Per-object CFLAGS for the pack2theroot translation unit (GLib include
# paths). Target-specific vars are scoped to this object's recipe.
$(P2TR_OBJS): CFLAGS += $(P2TR_CFLAGS)
# Top-level dispatcher
TOP_OBJ := $(BUILD)/skeletonkey.o
ALL_OBJS := $(TOP_OBJ) $(CORE_OBJS) $(CFF_OBJS) $(DP_OBJS) $(EB_OBJS) $(PK_OBJS) $(NFT_OBJS) $(OVL_OBJS) $(CR4_OBJS) $(DCOW_OBJS) $(PTM_OBJS) $(NXC_OBJS) $(AFP_OBJS) $(FUL_OBJS) $(STR_OBJS) $(AFP2_OBJS) $(CRA_OBJS) $(OSU_OBJS) $(NSU_OBJS) $(AUG_OBJS) $(NFD_OBJS) $(NPL_OBJS) $(SAM_OBJS) $(SEQ_OBJS) $(SUE_OBJS) $(VMW_OBJS) $(DDC_OBJS) $(FGN_OBJS) $(P2TR_OBJS)
.PHONY: all clean debug static help
all: $(BIN)
$(BIN): $(ALL_OBJS)
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -lpthread $(P2TR_LIBS)
# Generic compile: any .c → corresponding .o under build/
$(BUILD)/%.o: %.c
@mkdir -p $(dir $@)
$(CC) $(CFLAGS) -Icore -I$(CFF_DIR)/src -c -o $@ $<
debug: CFLAGS := -O0 -g3 -Wall -Wextra -Wno-unused-parameter -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
debug: clean $(BIN)
static: LDFLAGS += -static
static: clean $(BIN)
clean:
rm -rf $(BUILD) $(BIN)
help:
@echo "Targets:"
@echo " make build optimized skeletonkey binary"
@echo " make debug build with -O0 -g3"
@echo " make static build a fully static binary"
@echo " make clean remove build artifacts"
@echo ""
@echo "Per-module (legacy) — not built by default:"
@echo " cd modules/copy_fail_family && make"
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