feat: POSIX conformance test suite and implementation fixes (99.4%) by NathanFlurry · Pull Request #46 · rivet-dev/secure-exec

NathanFlurry · 2026-03-23T00:01:19Z

Summary

Integrates the os-test POSIX.1-2024 conformance suite into WasmVM
Builds all os-test programs to both wasm32-wasip1 and native x86_64
Adds a Vitest-based conformance test runner with native parity comparison
Fixes 23 implementation gaps across libc, kernel, VFS, and device layer
Achieves 99.4% conformance (3330/3350 tests passing)

What changed

Infrastructure (US-001 → US-011)

make fetch-os-test / make os-test / make os-test-native build targets
posix-exclusions.json schema with honest categorization (wasm-limitation / wasi-gap / implementation-gap)
posix-conformance.test.ts test runner with native parity detection
validate-posix-exclusions.ts validation script
generate-posix-report.ts MDX report generator
import-os-test.ts upstream update script
.github/workflows/posix-conformance.yml CI workflow

Kernel & runtime fixes (US-012 → US-034)

stdout duplication — removed redundant callback wiring in spawnManaged()
VFS directory enumeration — fdOpen detects directories by stat; VFS populated from native build
VFS stat metadata — fstatat parent-relative path lookup
fcntl F_GETFD/F_SETFD — sysroot override tracks per-fd cloexec state
realloc(ptr, 0) — sysroot patch enables REALLOC_ZERO_BYTES_FREES in dlmalloc
namespace tests — stub main() for compile-only header conformance checks
POSIX directory hierarchy — kernel creates /tmp, /usr, /etc, /var, etc. at startup
glob/globfree — fixed by VFS directory enumeration fix
strfmon/strfmon_l — sysroot override for POSIX locale
open_wmemstream — sysroot override tracks wchar_t count
swprintf — sysroot override sets errno=EOVERFLOW
inet_ntop — sysroot override for RFC 5952 IPv6 formatting
pthread_condattr_getclock — sysroot patch fixes C operator precedence bug
pthread_mutex_trylock/timedlock/settype — sysroot override fixes lock tracking
pthread_attr_getguardsize/mutexattr_setrobust — sysroot override stores values
pthread_key_delete — sysroot override fixes NULL thread-list dereference
/dev/ptmx, /dev/random, /dev/tty, /dev/console, /dev/full — added to device layer
long-double printf/scanf — linked -lc-printscan-long-double
dev-ptc/dev-ptm — native parity detection (Sortix-specific paths)

Integrity fixes (US-023 → US-025, US-028, US-033)

All 5 C override fixes moved from test-only to patched sysroot
ffsll source replacement reverted — properly excluded as wasm-limitation
7 pthread exclusions recategorized from wasm-limitation to implementation-gap
Suite-specific VFS special-casing removed

Remaining exclusions (20 tests)

Category	Count	Notes
implementation-gap	17	stdio/wchar pipe I/O, poll/select pipe FDs, fmtmsg
wasi-gap	2	statvfs/fstatvfs (not in WASI spec)
wasm-limitation	1	ffsll (32-bit long truncates 64-bit constant)

Test plan

make -C native/wasmvm/c os-test os-test-native compiles all tests
pnpm vitest run packages/wasmvm/test/posix-conformance.test.ts passes
pnpm tsx scripts/validate-posix-exclusions.ts passes
No regressions in existing test suites
Typecheck passes

🤖 Generated with Claude Code

…ource

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…file Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…and wasm-limitation tests - Populate posix-exclusions.json with 178 skip exclusions across categories: compile-error (namespace/*, posix-parse/*, basic/ and include/ subsuites without WASI sysroot support), wasm-limitation (io/*, process/*, signal/*, pthread runtime failures, mmap, spawn), wasi-gap (pty/*, udp/*, paths/*, sys_statvfs, shared memory, sockets, termios), timeout (pthread_key_delete) - Switch test runner from kernel.exec() to kernel.spawn() to bypass sh -c wrapper and get real WASM binary exit codes (shell returned exit 17 for all child commands due to benign "could not retrieve pid" issue) - Add crossterm-0.28.1 WASI patch (ratatui/reedline dependency) to fix WASM runtime build — adds WASI stubs for terminal, cursor, event, and TTY modules matching the existing crossterm 0.29.0 patch - 35 remaining failures are implementation-gap tests for US-006 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Classify all 35 remaining os-test failures into 10 GitHub issues: - #31: stdout duplication in WASM binaries (8 tests) - #32: realloc(ptr,0) semantics (1 test) - #33: VFS directory enumeration + nftw (6 tests) - #34: VFS stat metadata (4 tests) - #35: file descriptor operations (5 tests) - #36: glob pattern matching (2 tests) - #37: locale/monetary formatting (2 tests) - #38: long double precision (3 tests) - #39: wide character streams (2 tests) - #40: missing libc functions ffsll/inet_ntop (2 tests) Also fix fail-exclusion check to consider both exit code AND native output parity (not just exit code), so tests that exit 0 but produce wrong stdout are correctly detected as still failing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

)

…42)

…sts (#43)

…root

…tead

…roundtrip

…fix dev-ptc/dev-ptm exclusions US-033: Verified no suite-specific special-casing remains (already removed in US-024). US-034: Added native parity detection for tests where both WASM and native fail identically. /dev/ptc and /dev/ptm are Sortix-specific paths that don't exist on real Linux either — both WASM and native produce identical ENOENT output. Removed both exclusions, conformance now 3330/3350 (99.4%).

mintlify · 2026-03-23T00:01:56Z

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Project	Status	Preview	Updated (UTC)
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NathanFlurry and others added 30 commits March 21, 2026 16:13

feat: US-001 - Add fetch-os-test Makefile target and vendor os-test s…

31a4d36

…ource

feat: US-002 - Add os-test WASM and native Makefile build targets

e58b941

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: US-003 - Create posix-exclusions.json schema and initial empty …

89e9e79

…file Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: US-004 - Create posix-conformance.test.ts test runner

058238f

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: US-007 - Create validate-posix-exclusions.ts validation script

c081775

feat: US-008 - Add posix-conformance.yml CI workflow

2d21b55

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: US-009 - Create generate-posix-report.ts report generation script

9057d02

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: US-010 - Add conformance report to docs navigation and cross-link

522b6e9

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: US-011 - Create import-os-test.ts upstream update script

8e9c2d8

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: US-012 - Fix stdout duplication bug (#31)

d047138

chore: update PRD and progress for US-012

0e9ec12

feat: US-013 - Fix VFS directory enumeration (#33)

ec583f6

chore: update PRD and progress for US-013

d4bac14

feat: US-014 - Fix VFS stat metadata (#34)

6a7619c

chore: update PRD and progress for US-014

b4fd5af

chore: update progress for US-014

4d86d9b

feat: US-015 - Fix fcntl, openat, faccessat, lseek, read edge cases (#35

3722055

)

feat: US-016 - Fix namespace tests — add main() stub or fix Makefile (#…

b37f4a1

…42)

feat: US-017 - Add POSIX filesystem hierarchy to VFS and fix paths te…

d5c3618

…sts (#43)

feat: US-018 - Fix realloc(ptr, 0) semantics (#32)

5e83691

feat: US-019 - Fix glob() in WASI sysroot (#36)

10cc4b6

feat: US-020 - Fix strfmon locale support (#37)

8391451

feat: US-021 - Fix wide char stream functions (#39)

7d35dad

feat: US-022 - Fix ffsll and inet_ntop (#40)

780daba

feat: US-023 - Move C override fixes from os-test-only to patched sys…

65f25d8

…root

feat: US-024 - Move POSIX directory hierarchy from test runner to kernel

95aaf63

feat: US-025 - Revert ffsll source replacement — exclude properly ins…

d34cce2

…tead

feat: US-026 - Link long-double printf/scanf support and retest

3588fc6

NathanFlurry added 8 commits March 22, 2026 13:56

feat: US-027 - Add /dev/ptmx to device layer

f17c976

feat: US-028 - Recategorize pthread and long-double exclusions honestly

66a5f7f

feat: US-029 - Fix pthread condattr clock attribute support

398aca9

feat: US-030 - Fix pthread mutex trylock, timedlock, and settype

10c4a7b

feat: US-031 - Fix pthread attr getguardsize and mutexattr setrobust …

3fb67d1

…roundtrip

feat: US-032 - Investigate and fix pthread_key_delete hang

3cd0d3e

feat: US-034 - Investigate and fix dev-ptc and dev-ptm exclusions

6b165d7

mintlify bot deployed to staging - docs March 23, 2026 00:02 View deployment

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feat: POSIX conformance test suite and implementation fixes (99.4%)#46

feat: POSIX conformance test suite and implementation fixes (99.4%)#46
NathanFlurry wants to merge 38 commits intomainfrom
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NathanFlurry commented Mar 23, 2026

Summary

What changed

Infrastructure (US-001 → US-011)

Kernel & runtime fixes (US-012 → US-034)

Integrity fixes (US-023 → US-025, US-028, US-033)

Remaining exclusions (20 tests)

Test plan

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