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RE-UE4SS Linux v0.1.1

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@NullPrism NullPrism released this 30 Jul 03:00
· 2 commits to main since this release
linux-v0.1.1
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Learn about vigilant mode.

RE-UE4SS Linux v0.1.1

This patch prerelease hardens the native Linux launcher and updates the
validated Palworld Dedicated Server target.

Validated target

  • Palworld Dedicated Server 1.0.2.100933
  • Steam build ID 24370498
  • Unreal Engine 5.1.1
  • Native x86-64 Linux server
  • Fedora Linux 43 validation hosts
  • PalServer SHA-256
    d16b4d840a30dc3f467fe1059a0088ddb08a4b513cc45150767cba1785867d30
  • PalServer ELF build ID c339de6590a6a669
  • Scoped SELinux entrypoint type palworld_ue4ss_exec_t
  • Scoped SELinux process domain palworld_ue4ss_t

The exact release source commit, packaged loader identity, archive checksums,
and final acceptance evidence are recorded in the release manifest and package
metadata.

Highlights

  • Detect stale SELinux labels on the host executable before UE4SS startup.
  • Add UE4SS_SELINUX_PREFLIGHT modes:
    • off
    • warn, which is the default
    • strict
  • Add UE4SS_EXPECTED_SELINUX_TYPE for scoped SELinux deployments.
  • Exit with status 8 in strict mode when the host executable has an unexpected
    SELinux type.
  • Warn when common unsuitable default types such as user_home_t are detected.
  • Document persistent semanage fcontext mappings.
  • Document running restorecon after game updates and validation operations.
  • Continue operating without enabling the global execheap boolean.
  • Update the current compatibility target to Palworld 1.0.2.100933.

Incident resolved

The Palworld 1.0.2 update replaced PalServer-Linux-Shipping with a new inode.
The replacement received the default user_home_t SELinux type instead of the
persistent UE4SS entrypoint type.

The server consequently remained in unconfined_t, and SELinux denied
execheap when PolyHook attempted to make an EngineTick trampoline executable.
The server later faulted when execution entered the non-executable trampoline.

Restoring palworld_ue4ss_exec_t caused the expected transition into
palworld_ue4ss_t. The existing loader then started successfully with no new
SELinux AVCs.

No PatternSleuth signatures, Unreal member offsets, EngineTick targets, or
Palworld-specific hook definitions required changes.

Launcher configuration

Scoped deployments can require the expected entrypoint type with:

UE4SS_SELINUX_PREFLIGHT=strict
UE4SS_EXPECTED_SELINUX_TYPE=palworld_ue4ss_exec_t

The launcher exits before installing runtime hooks when strict validation
fails. This replaces a delayed executable-memory fault with an immediate,
actionable diagnostic.

Downloads

  • RE-UE4SS-Linux-0.1.1-x86_64.tar.gz
  • RE-UE4SS-Linux-0.1.1-x86_64-debug.tar.gz
  • RELEASE-MANIFEST.txt
  • Accompanying SHA-256 files

The runtime archive contains the loader, process-scoped launcher, settings,
bundled mod files, installation documentation, provenance metadata, and
internal checksums.

Compatibility scope

This prerelease does not claim compatibility with every Unreal Engine game,
engine version, Linux distribution, or third-party UE4SS mod.

Compatibility applies only to combinations explicitly recorded in the Linux
compatibility matrix. Stop the host process to unload UE4SS; do not use
dlclose.

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