dirty_pipe detect: active sentinel probe (Phase 1.5-ish improvement)
- New dirty_pipe_active_probe(): creates a /tmp probe file with known
sentinel bytes, fires the Dirty Pipe primitive against it, re-reads
via the page cache, returns true if the poisoning landed.
- detect() gated on ctx->active_probe: --scan does version-only check
(fast, no side effects); --scan --active fires the empirical probe
and overrides version inference with the empirical verdict. Catches
silent distro backports that don't bump uname() version.
- Three verdicts now distinguishable:
(a) version says patched, no active probe → 'patched (version-only)'
(b) version says vulnerable, --active fires + probe lands → CONFIRMED
(c) version says vulnerable, --active fires + probe blocked → 'likely
patched via distro backport'
- Probe is safe: only /tmp, no /etc/passwd.
nf_tables CVE-2024-1086 (detect-only, new module):
- Famous Notselwyn UAF in nft_verdict_init. Affects 5.14 ≤ K, fixed
mainline 6.8 with backports landing in 5.4.269 / 5.10.210 / 5.15.149
/ 6.1.74 / 6.6.13 / 6.7.2.
- detect() checks: kernel version range, AND unprivileged user_ns clone
availability (the exploit's reachability gate — kernel-vulnerable
but userns-locked-down hosts report PRECOND_FAIL, signalling that
the kernel still needs patching but unprivileged path is closed).
- Ships auditd + sigma detection rules: unshare(CLONE_NEWUSER) chained
with setresuid(0,0,0) on a previously-non-root process is the
exploit's canonical telltale.
- Full Notselwyn-style exploit (cross-cache UAF → arbitrary R/W → cred
overwrite or modprobe_path hijack) is the next commit.
9 modules total now. CVES.md and ROADMAP.md updated.
- copy_fail_family/iamroot_modules.c: two new bridge functions
- copy_fail_family_mitigate: calls existing mitigate_apply() which
blacklists algif_aead + esp4 + esp6 + rxrpc, sets
kernel.apparmor_restrict_unprivileged_userns=1, drops caches.
- copy_fail_family_cleanup: heuristic-routed cleanup. If the
mitigation conf file (/etc/modprobe.d/dirtyfail-mitigations.conf)
exists → mitigate_revert(). Otherwise → try_revert_passwd_page_cache()
to evict /etc/passwd from page cache.
- All 5 copy_fail_family modules' .mitigate and .cleanup fields now
point at these shared family-wide handlers (the mitigation is
family-wide, not per-CVE).
- dirty_pipe and entrybleed: no --mitigate offered (no canonical
patches / only-fix-is-upgrade). Documented in ROADMAP.
Verified end-to-end on kctf-mgr as non-root user:
iamroot --mitigate copy_fail → 'mitigate requires root' (correct)
iamroot --cleanup copy_fail → 'no mitigation conf; evicting page cache'
CVES.md gains a per-module ops table; ROADMAP.md marks Phase 6 partial.
- .github/workflows/build.yml: matrix of {gcc, clang} x {default,
debug} builds on every push + PR. Smoke tests after build:
--version, --list, --scan, --detect-rules auditd, --detect-rules
sigma. Build failure breaks merge gate.
- Static-build job runs continue-on-error (glibc + NSS issue with
static linking — getpwnam pulls in NSS at runtime; legacy DIRTYFAIL
Makefile noted this. Revisit with musl-gcc to get a truly portable
static binary).
- Kernel-VM matrix placeholder commented at the bottom of build.yml.
Real kernel matrix needs self-hosted runners or a paid VM service —
out of scope for tonight, in scope for Phase 4 followup.
- Implements the Dirty Pipe primitive: prepare_pipe() fills+drains a
pipe to plant the stale PIPE_BUF_FLAG_CAN_MERGE flag in every
pipe_buffer slot; dirty_pipe_write() splices 1 byte from the target
file at offset-1 (seeding the slot with the file's page) then write()s
the payload, which the buggy kernel merges back into the page cache.
- find_passwd_uid_field() + revert_passwd_page_cache() inlined in the
module. Two-of-two duplication acceptable; extraction into core/host
triggers when a third module needs the same helpers (Phase 1.5).
- dirty_pipe_exploit() resolves current euid via getpwuid, locates the
user's UID field in /etc/passwd, replaces it with same-length zeros
('0000' for a 4-digit UID), then execlp's su <user> -c /bin/sh.
Auto-refuses if detect() reports patched. --no-shell mode plants the
write and returns. Cleanup mode evicts /etc/passwd from page cache.
- _GNU_SOURCE redefine warning fixed: cmdline -D already passes it.
Verified end-to-end on kernel 6.12.86 (patched):
iamroot --scan → dirty_pipe reports OK (patched)
iamroot --exploit dirty_pipe --i-know → refuses cleanly
CI-validation against vulnerable kernel (Ubuntu 20.04 / 5.13) is Phase 4.
CVES.md: dirty_pipe 🔵 → 🟢. ROADMAP.md: Phase 2 marked complete.
- modules/entrybleed_cve_2023_0458/ (promoted out of _stubs):
- iamroot_modules.{c,h}: full EntryBleed primitive (rdtsc_start/end
+ prefetchnta + KASLR-slot timing sweep) wired into the standard
iamroot_module interface. x86_64 only; ARM/other gracefully
return IAMROOT_PRECOND_FAIL.
- detect(): reads /sys/.../vulnerabilities/meltdown to decide
KPTI status. Mitigation: PTI → VULNERABLE. Not affected → OK.
- exploit(): sweeps the 16MiB KASLR range, prints leaked kbase
(and KASLR slide). JSON-mode emits {"kbase":"0x..."} to stdout.
- entrybleed_leak_kbase_lib(off) declared as a public library
helper so future LPE chains needing a stage-1 leak can just
#include the module's header and call it.
- entry_SYSCALL_64 slot offset overridable via
IAMROOT_ENTRYBLEED_OFFSET (default 0x5600000 for lts-6.12.x).
- __always_inline fallback added since glibc/Linux-kernel macro
isn't universal; module now builds clean under macOS clangd lint
and on musl.
- iamroot.c registers entrybleed alongside the other families;
Makefile gains it as a separate object set.
Verified end-to-end on kctf-mgr (Debian 6.12.86):
iamroot --exploit entrybleed --i-know
→ [+] entrybleed: leaked kbase = 0xffffffff8d800000
This is the FIRST WORKING-EXPLOIT module in IAMROOT (5
copy_fail_family modules wrap existing code from DIRTYFAIL;
dirty_pipe is detect-only). EntryBleed is x86_64 stage-1 brick
that future chains can compose.
- core/kernel_range.{c,h}: branch-aware patched-version comparison.
Every future module needs 'is the host kernel in the affected
range?'; centralized here. Models stable-branch backports
(e.g. 5.10.102, 5.15.25) so a 5.15.20 host correctly reports
VULNERABLE while a 5.15.50 host reports OK.
- modules/dirty_pipe_cve_2022_0847/ (promoted out of _stubs):
- iamroot_modules.{c,h}: dirty_pipe module exposing detect() that
parses /proc/version and compares against the four known patched
branches (5.10.102, 5.15.25, 5.16.11, 5.17+ inherited). Returns
IAMROOT_OK / IAMROOT_VULNERABLE / IAMROOT_TEST_ERROR with stderr
hints in human-readable scan mode.
- exploit() returns IAMROOT_PRECOND_FAIL with a 'not yet
implemented' message; landing the actual exploit needs Phase 1.5
extraction of passwd/su helpers into core/.
- detect/auditd.rules: splice() syscall + passwd/shadow file watches
- detect/sigma.yml: non-root modification of /etc/passwd|shadow|sudoers
- iamroot.c main() calls iamroot_register_dirty_pipe() alongside
the copy_fail_family registration.
- Makefile gains the dirty_pipe family as a separate object set.
Verified end-to-end on kctf-mgr (kernel 6.12.86): build clean, 6
modules in --list, --scan correctly reports dirty_pipe as patched,
JSON output ingest-ready.
leviathan