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  • win64-main-3a24db5 3a24db567f

    core: implement coalesced writes for gettimeofday and set POSIX EFAULT (#70)

    Ghost released this 2026-07-11 16:05:36 -04:00 | 534 commits to 1016_part3 since this release

    Follow-up task to enforce coalesced guest memory writes within the gettimeofday subsystem, removing remaining partial-write risks on virtual memory page boundaries.

    • sceKernelGettimeofday Hardening: Replaced consecutive isolated 8-byte scalar writes with a single 16-byte coalesced transaction buffer using stackalloc byte[16] and BinaryPrimitives. It preserves native Orbis semantics by returning ORBIS_GEN2_ERROR_MEMORY_FAULT on failure states without side-effect partial-writes.
    • POSIX gettimeofday Compliance:
      • Applied the identical single-transaction 16-byte write pattern for the timeval structure.
      • Implemented a single 8-byte coalesced zero-fill transaction for the deprecated/legacy timezone buffer (timezoneAddress != 0) using BinaryPrimitives.WriteInt32LittleEndian, aligning it with standard FreeBSD stub behavior.
      • Integrated proper TrySetErrno(ctx, Efault) tracking upon write failures. The method safely omits explicit manual Rax writes on error paths, allowing the import dispatcher to cleanly sign-extend the return -1 value to 0xFFFFFFFFFFFFFFFF.

    Out of scope: Subsystem clock and timeval validation is now fully complete; no further temporal partial-write vulnerabilities remain within the core runtime memory compat layers.

    Files: KernelRuntimeCompatExports.cs

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