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Mike Saito
3a24db567f
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