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SKELETONKEY/Makefile
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leviathan a8c8d5ef1f modules: add dirtydecrypt (CVE-2026-31635) + fragnesia (CVE-2026-46300) 
Two new page-cache-write LPE modules, both ported from the public V12
security PoCs (github.com/v12-security/pocs):

- dirtydecrypt (CVE-2026-31635): rxgk missing-COW in-place decrypt.
  rxgk_decrypt_skb() decrypts spliced page-cache pages before the HMAC
  check, corrupting the page cache of a read-only file. Sibling of
  Copy Fail / Dirty Frag in the rxrpc subsystem.

- fragnesia (CVE-2026-46300): XFRM ESP-in-TCP skb_try_coalesce() loses
  the SHARED_FRAG marker, so the ESP-in-TCP receive path decrypts
  page-cache pages in place. A latent bug exposed by the Dirty Frag
  fix (f4c50a4034e6). Retires the old _stubs/fragnesia_TBD stub.

Both wrap the PoC exploit primitive in the skeletonkey_module
interface: detect/exploit/cleanup, an --active /tmp sentinel probe,
--no-shell support, and embedded auditd + sigma rules. The exploit
body runs in a forked child so the PoC's exit()/die() paths cannot
tear down the dispatcher. The fragnesia port drops the upstream PoC's
ANSI TUI (incompatible with a shared dispatcher); the exploit
mechanism is reproduced faithfully. Linux-only code is guarded with
#ifdef __linux__ so the modules still compile on non-Linux dev boxes.

VERIFICATION: ported, NOT yet validated end-to-end on a
vulnerable-kernel VM. The CVE fix commits are not pinned, so detect()
is precondition-only (PRECOND_FAIL / TEST_ERROR, never a blind
VULNERABLE) and --auto will not fire them unless --active confirms.
macOS stub-path compiles verified locally; the Linux exploit-path
build is covered by CI (build.yml, ubuntu) only. See each MODULE.md.

Wiring: core/registry.h, skeletonkey.c, Makefile, CVES.md, ROADMAP.md.
2026-05-22 18:22:30 -04:00

190 lines
7.0 KiB
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_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))
# 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)
.PHONY: all clean debug static help
all: $(BIN)
$(BIN): $(ALL_OBJS)
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -lpthread
# 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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