/* * tests/test_detect.c — detect() unit tests * * Each test builds a synthetic struct skeletonkey_host fingerprint * (vulnerable / patched / specific-gate-closed) and asserts each * module's detect() returns the expected verdict. Catches regressions * in the host-fingerprint-consuming logic across the corpus. * * Coverage today is the four modules that already consume ctx->host: * - dirtydecrypt (CVE-2026-31635) * - fragnesia (CVE-2026-46300) * - pack2theroot (CVE-2026-41651) * - overlayfs (CVE-2021-3493) * Coverage grows automatically as more modules migrate to ctx->host * (see ROADMAP "core/host" follow-up). * * Why only Linux: every module's real detect() lives inside * `#ifdef __linux__`; on non-Linux the stubs unconditionally return * PRECOND_FAIL so the tests are tautologies. The harness compiles * cross-platform but skips the assertions on non-Linux to keep the * macOS dev build green while still preventing bit-rot of the test * infrastructure. */ #include "../core/module.h" #include "../core/host.h" #include #include #include extern const struct skeletonkey_module dirtydecrypt_module; extern const struct skeletonkey_module fragnesia_module; extern const struct skeletonkey_module pack2theroot_module; extern const struct skeletonkey_module overlayfs_module; extern const struct skeletonkey_module dirty_pipe_module; extern const struct skeletonkey_module dirty_cow_module; extern const struct skeletonkey_module ptrace_traceme_module; extern const struct skeletonkey_module cgroup_release_agent_module; extern const struct skeletonkey_module nf_tables_module; extern const struct skeletonkey_module fuse_legacy_module; extern const struct skeletonkey_module cls_route4_module; extern const struct skeletonkey_module overlayfs_setuid_module; extern const struct skeletonkey_module af_packet_module; extern const struct skeletonkey_module af_packet2_module; extern const struct skeletonkey_module af_unix_gc_module; extern const struct skeletonkey_module netfilter_xtcompat_module; extern const struct skeletonkey_module nft_set_uaf_module; extern const struct skeletonkey_module nft_fwd_dup_module; extern const struct skeletonkey_module nft_payload_module; extern const struct skeletonkey_module stackrot_module; extern const struct skeletonkey_module sequoia_module; extern const struct skeletonkey_module vmwgfx_module; static int g_pass = 0; static int g_fail = 0; static const char *result_str(skeletonkey_result_t r) { switch (r) { case SKELETONKEY_OK: return "OK"; case SKELETONKEY_TEST_ERROR: return "TEST_ERROR"; case SKELETONKEY_VULNERABLE: return "VULNERABLE"; case SKELETONKEY_EXPLOIT_FAIL: return "EXPLOIT_FAIL"; case SKELETONKEY_PRECOND_FAIL: return "PRECOND_FAIL"; case SKELETONKEY_EXPLOIT_OK: return "EXPLOIT_OK"; } return "???"; } #ifdef __linux__ /* Suppress per-module banner chatter so the test output stays tidy. * Modules respect ctx->json to mean "structured output mode; no banners" * — see each module's `if (!ctx->json) fprintf(...)` pattern. */ static void run_one(const char *test_name, const struct skeletonkey_module *m, const struct skeletonkey_host *h, skeletonkey_result_t want) { struct skeletonkey_ctx ctx = {0}; ctx.host = h; ctx.json = true; /* silence per-module log lines */ skeletonkey_result_t got = m->detect(&ctx); if (got == want) { printf("[+] PASS %-40s %s → %s\n", test_name, m->name, result_str(got)); g_pass++; } else { fprintf(stderr, "[-] FAIL %-40s %s: want %s, got %s\n", test_name, m->name, result_str(want), result_str(got)); g_fail++; } } /* ── fingerprints ────────────────────────────────────────────────── */ /* Linux 6.12.76 (Debian 13), no userns, no D-Bus, not Ubuntu — a * deliberately neutered host that lets the host-fingerprint-only * gates fire without falling into deeper module logic. */ static const struct skeletonkey_host h_pre7_no_userns_no_dbus = { .kernel = { .major = 6, .minor = 12, .patch = 76, .release = "6.12.76-test" }, .arch = "x86_64", .nodename = "test", .distro_id = "debian", .distro_version_id = "13", .distro_pretty = "Debian GNU/Linux 13", .is_linux = true, .is_debian_family = true, .unprivileged_userns_allowed = false, .has_dbus_system = false, .has_systemd = true, }; /* Fedora 43, no Debian family, userns allowed. */ static const struct skeletonkey_host h_fedora_no_debian = { .kernel = { .major = 6, .minor = 14, .patch = 0, .release = "6.14.0-fedora" }, .arch = "x86_64", .nodename = "test", .distro_id = "fedora", .distro_version_id = "43", .distro_pretty = "Fedora 43", .is_linux = true, .is_rpm_family = true, .is_debian_family = false, .unprivileged_userns_allowed = true, .has_dbus_system = true, .has_systemd = true, }; /* Ubuntu 24.04, userns allowed, D-Bus running, Debian family * (because Ubuntu has /etc/debian_version). Used as the "fragnesia * preconditions OK" baseline — fragnesia should NOT short-circuit * on userns/userspace gates here. */ static const struct skeletonkey_host h_ubuntu_24_userns_ok = { .kernel = { .major = 6, .minor = 8, .patch = 0, .release = "6.8.0-ubuntu" }, .arch = "x86_64", .nodename = "test", .distro_id = "ubuntu", .distro_version_id = "24.04", .distro_pretty = "Ubuntu 24.04 LTS", .is_linux = true, .is_debian_family = true, .unprivileged_userns_allowed = true, .has_dbus_system = true, .has_systemd = true, }; /* Ancient kernel that predates many bugs (Linux 4.4 LTS). Useful for * the "kernel predates the bug → OK" path in dirty_pipe (bug * introduced 5.8). */ static const struct skeletonkey_host h_kernel_4_4 = { .kernel = { .major = 4, .minor = 4, .patch = 0, .release = "4.4.0-ancient" }, .arch = "x86_64", .nodename = "test", .distro_id = "debian", .is_linux = true, .is_debian_family = true, .unprivileged_userns_allowed = true, }; /* Recent kernel (Linux 6.12 LTS). Above virtually every backport * threshold in the corpus — modules should report OK via the * "patched by mainline inheritance" branch of kernel_range_is_patched. */ static const struct skeletonkey_host h_kernel_6_12 = { .kernel = { .major = 6, .minor = 12, .patch = 0, .release = "6.12.0-recent" }, .arch = "x86_64", .nodename = "test", .distro_id = "debian", .is_linux = true, .is_debian_family = true, .unprivileged_userns_allowed = true, }; /* Vulnerable-era kernel (5.14.0) with userns DISABLED. Most * netfilter / overlayfs / cgroup-class modules need both an in-range * kernel AND unprivileged userns. Kernel 5.14 was deliberately * chosen to clear every module's "predates the bug" pre-check in * this batch (nf_tables introduced 5.14; overlayfs_setuid 5.11; * cls_route4/fuse_legacy older still) while remaining below every * stable-branch backport entry (5.15.x / 5.18.x / 5.19.x in the * relevant tables). The version check therefore says "VULNERABLE by * version", and the userns gate fires next. */ static const struct skeletonkey_host h_kernel_5_14_no_userns = { .kernel = { .major = 5, .minor = 14, .patch = 0, .release = "5.14.0-vuln-no-userns" }, .arch = "x86_64", .nodename = "test", .distro_id = "debian", .is_linux = true, .is_debian_family = true, .unprivileged_userns_allowed = false, }; #endif /* __linux__ */ /* ── tests ───────────────────────────────────────────────────────── */ static void run_all(void) { #ifdef __linux__ /* dirtydecrypt: kernel.major < 7 → predates the bug → OK */ run_one("dirtydecrypt: kernel 6.12 predates 7.0 → OK", &dirtydecrypt_module, &h_pre7_no_userns_no_dbus, SKELETONKEY_OK); run_one("dirtydecrypt: kernel 6.14 (fedora) still predates → OK", &dirtydecrypt_module, &h_fedora_no_debian, SKELETONKEY_OK); run_one("dirtydecrypt: kernel 6.8 (ubuntu) still predates → OK", &dirtydecrypt_module, &h_ubuntu_24_userns_ok, SKELETONKEY_OK); /* fragnesia: userns disabled → XFRM gate closed → PRECOND_FAIL */ run_one("fragnesia: userns_allowed=false → PRECOND_FAIL", &fragnesia_module, &h_pre7_no_userns_no_dbus, SKELETONKEY_PRECOND_FAIL); /* pack2theroot: not Debian family → PRECOND_FAIL */ run_one("pack2theroot: is_debian_family=false → PRECOND_FAIL", &pack2theroot_module, &h_fedora_no_debian, SKELETONKEY_PRECOND_FAIL); /* pack2theroot: Debian family but no D-Bus socket → PRECOND_FAIL */ run_one("pack2theroot: has_dbus_system=false → PRECOND_FAIL", &pack2theroot_module, &h_pre7_no_userns_no_dbus, SKELETONKEY_PRECOND_FAIL); /* overlayfs: distro != ubuntu → bug is Ubuntu-specific → OK */ run_one("overlayfs: distro=debian → not Ubuntu → OK", &overlayfs_module, &h_pre7_no_userns_no_dbus, SKELETONKEY_OK); run_one("overlayfs: distro=fedora → not Ubuntu → OK", &overlayfs_module, &h_fedora_no_debian, SKELETONKEY_OK); /* ── kernel-version-gate cases (post-migration coverage) ──── */ /* dirty_pipe: bug introduced in 5.8; kernel 4.4 predates → OK */ run_one("dirty_pipe: kernel 4.4 predates 5.8 → OK", &dirty_pipe_module, &h_kernel_4_4, SKELETONKEY_OK); /* dirty_pipe: kernel 6.12 is above every backport entry → OK */ run_one("dirty_pipe: kernel 6.12 above all backports → OK", &dirty_pipe_module, &h_kernel_6_12, SKELETONKEY_OK); /* dirty_cow: fix in mainline 4.9; kernel 6.12 is far above → OK */ run_one("dirty_cow: kernel 6.12 above 4.9 fix → OK", &dirty_cow_module, &h_kernel_6_12, SKELETONKEY_OK); /* ptrace_traceme: fix in 5.1.17; kernel 6.12 above → OK */ run_one("ptrace_traceme: kernel 6.12 above 5.1.17 fix → OK", &ptrace_traceme_module, &h_kernel_6_12, SKELETONKEY_OK); /* cgroup_release_agent: fix in mainline 5.17; kernel 6.12 above → OK */ run_one("cgroup_release_agent: kernel 6.12 above 5.17 fix → OK", &cgroup_release_agent_module, &h_kernel_6_12, SKELETONKEY_OK); /* ── userns-gate cases ───────────────────────────────────── */ /* nf_tables: vulnerable kernel 5.10.0 + userns off → PRECOND_FAIL */ run_one("nf_tables: vuln kernel + userns=false → PRECOND_FAIL", &nf_tables_module, &h_kernel_5_14_no_userns, SKELETONKEY_PRECOND_FAIL); /* fuse_legacy: vulnerable kernel + userns off → PRECOND_FAIL */ run_one("fuse_legacy: vuln kernel + userns=false → PRECOND_FAIL", &fuse_legacy_module, &h_kernel_5_14_no_userns, SKELETONKEY_PRECOND_FAIL); /* cls_route4: vulnerable kernel + userns off → PRECOND_FAIL */ run_one("cls_route4: vuln kernel + userns=false → PRECOND_FAIL", &cls_route4_module, &h_kernel_5_14_no_userns, SKELETONKEY_PRECOND_FAIL); /* overlayfs_setuid: vulnerable kernel (5.14, past the 5.11 * introduction and below every backport) + userns off * → PRECOND_FAIL via userns gate */ run_one("overlayfs_setuid: vuln kernel + userns=false → PRECOND_FAIL", &overlayfs_setuid_module, &h_kernel_5_14_no_userns, SKELETONKEY_PRECOND_FAIL); /* ── above-fix coverage for the remaining kernel modules ── * Kernel 6.12 is above every backport entry in the corpus. * For modules with a `kernel_range` table, kernel_range_is_patched * inherits via the "host is newer than every entry" branch and * detect() returns OK. */ run_one("af_packet: kernel 6.12 above 4.11 fix → OK", &af_packet_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("af_packet2: kernel 6.12 above 5.9 fix → OK", &af_packet2_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("af_unix_gc: kernel 6.12 above 6.6-rc1 fix → OK", &af_unix_gc_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("netfilter_xtcompat: kernel 6.12 above 5.12 fix → OK", &netfilter_xtcompat_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("nft_set_uaf: kernel 6.12 above 6.4-rc4 fix → OK", &nft_set_uaf_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("nft_fwd_dup: kernel 6.12 above 5.17 fix → OK", &nft_fwd_dup_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("nft_payload: kernel 6.12 above 6.2-rc4 fix → OK", &nft_payload_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("stackrot: kernel 6.12 above 6.4-rc4 fix → OK", &stackrot_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("sequoia: kernel 6.12 above 5.13.4 fix → OK", &sequoia_module, &h_kernel_6_12, SKELETONKEY_OK); run_one("vmwgfx: kernel 6.12 above 6.3-rc6 fix → OK", &vmwgfx_module, &h_kernel_6_12, SKELETONKEY_OK); /* ── ancient-kernel predates coverage ──────────────────────── * Kernel 4.4 predates several module bugs introduced 5.x+. */ run_one("nft_set_uaf: kernel 4.4 predates 5.1 → OK", &nft_set_uaf_module, &h_kernel_4_4, SKELETONKEY_OK); run_one("stackrot: kernel 4.4 predates 6.1 → OK", &stackrot_module, &h_kernel_4_4, SKELETONKEY_OK); #else fprintf(stderr, "[i] non-Linux platform: detect() bodies are stubbed; " "tests skipped (would tautologically pass).\n"); #endif } int main(void) { fprintf(stderr, "=== SKELETONKEY detect() unit tests ===\n\n"); run_all(); fprintf(stderr, "\n=== RESULTS: %d passed, %d failed ===\n", g_pass, g_fail); return g_fail ? 1 : 0; }