vmie_win32_open_ro_fd maps the RAM backing file PROT_READ (via
gpa_from_ro_fd) and does NOT bootstrap; the caller passes a cr3 to each
read call. The read surfaces work this way - sections / functions /
imports / exports / callgraph / hooks, gva_read_text, and the generic
gva_* and scanner surfaces via vmie_win32_mem() - while any write returns
-1 because the mapping is read-only. The RW twin vmie_win32_open_fd and
host_bootstrap are unchanged.
vmie_mem could only be built from a path. Add a second input: an
already-open file descriptor, dup()'d internally (borrowed - the
caller's fd stays valid, core owns and closes its copy).
- vmie_mem_from_fd / vmie_mem_from_fd_segs (read-write, as the path
constructors: PROT_RW, MAP_SHARED)
- vmie_mem_from_ro_fd / vmie_mem_from_ro_fd_segs (read-only: map
PROT_READ, mark the source ro; gpa_write/gva_write return -1, every
read path is unchanged; accepts an O_RDONLY fd)
- vmie_win32_open_fd (the win32 context over an fd backing file)
Factor the mmap/validate tail and the single-low segment map out of the
path constructors into shared helpers, so the path and fd inputs go
through one mmap site and one map builder each.
Wave 2 of the code-analysis layer:
- vmie_win32_imports resolves the import directory (INT/IAT) to {iat_rva, dll,
name, ordinal} - named APIs, walking the name and slot thunks in lockstep so
every import carries the IAT slot a call lands on.
- vmie_win32_inline_hooks decodes each .pdata function's entry and reports any
whose first instruction is a direct jmp/call leaving the module image - the
detour/trampoline shape.
- vmie_win32_func_imports records, in order, the IAT slots a function calls
through (call qword [rip+disp] onto an import slot): the function's API-call
sequence, named by correlating with vmie_win32_imports.
- func_hash (codeanalysis.h) hashes a function position-independently, zeroing
the displacement bytes the decoder locates - one primitive for fingerprinting
known code and for detecting a changed body across snapshots.
Devirtualization needs no new call and is documented as a composition: a
vtable's methods are gva_jumptable(vtable_va), its instances are
pmap_referrers(vtable_va), and func_hash names each method. Imports reuse the
shared data-directory accessor; the analyses reuse the function/section/decode
primitives - no second PE or instruction parser.
Wave 1 of the code-analysis layer, built on the x86-64 decoder:
- vmie_win32_callgraph walks each .pdata function with the decoder and emits an
edge for every direct call/jmp whose target lands in the module - the
intra-module call graph. Indirect edges are left to the IAT and jump tables.
- gva_jumptable recovers a switch's case targets from an indirect jump's table:
consecutive pointer entries that land in an executable region.
- cfg_blocks splits one function view into basic blocks (a generic handler:
leaders from intra-function branch targets, cut after jmp/jcc/ret).
- gva_imm_xref finds the instructions whose immediate operand equals a constant
- the dual of code-xref for magic values, error codes, syscall numbers.
The decoder now also reports imm_off/imm_len so a caller can read or match the
immediate operand. The generic primitives live in the new codeanalysis.h
(jump tables, basic blocks) and scan.h (constant xref); the .pdata-bound call
graph stays on the win32 surface and reuses the existing function/section/decode
primitives - no second PE or instruction parser.
Three reversing capabilities on the win32 surface plus a pure sig-gen handler:
- vmie_win32_functions enumerates a module's functions from the exception
directory (.pdata RUNTIME_FUNCTION), folding unwind chain continuations into
their primary - authoritative non-leaf boundaries, not prologue heuristics.
- vmie_win32_exports resolves the export table to {name, rva, ordinal,
forwarded}: named functions with no PDB or network. vmie_win32_pdb_ref pulls
the CodeView/RSDS {guid, age, pdb} from the debug directory - the symbol-server
key for any module (full PDB parsing stays out of scope).
- sig_generate (siggen.h) builds a unique masked signature for a code span,
wildcarding the rel/RIP-relative displacement bytes the x86 decoder locates and
growing until it matches the scope exactly once - the dual of sigscan.
The decoder now also reports disp_off/disp_len so a caller can mask the floating
bytes. The MZ/PE walk gains one shared data-directory accessor and one shared
CodeView/RSDS parser; the kernel bootstrap is moved onto both, removing its
private copies - one PE parser in the tree.
vmie_win32_sections lists a module's PE sections (name, RVA, virtual size,
VR_* protection) for any image base in a process address space - including a
base found by scanning, not only loader-list modules. vmie_win32_section_view
gathers a section's bytes into a caller buffer and returns a mem_view_t whose
base_va is chosen by view_base: SECTION_LOCAL (0, section-relative offsets),
MODULE_RVA (ASLR-stable module RVAs), or ABSOLUTE_VA (live VA). Because the pure
scanners report base_va + offset, the mode directly selects the coordinate space
of every hit - feeding a view to sig_all or x86_decode yields section-relative,
RVA, or absolute results with no extra work.
The MZ/PE header walk is factored into one helper that both pe_find_section and
the new enumerator share - no second parser. The whole public surface is
documented with the operational nuances (coordinate stability, borrowed-buffer
lifetime, truncation, residency) and worked examples.
Name and isolate the Windows engine as one of potentially several. The
public surface moves to include/win32.h with an opaque vmie_win32 handle
(vmie_win32_open/close/mem); the engine's Windows internals — host bring-up,
the struct-offset profile, process/module/PE/text decode — live under
src/engine/win32. The generic address-space layer stays in src/engine
(gva.c + engine-arch.h, carrying no offset table): gva.c is de-profiled, and
CR3 bring-up reaches the hot translator through a cold gva_translate bridge
so the zero-copy hot path stays private and inlinable.
A memory source is now first-class and public: vmie_mem_open/_open_segs/
_close open a flat dump (or an explicit segment map) as a vmie_mem, with
gpa_seg promoted to the public contract. The physical signature scan is
exposed source-agnostically: sig_scan_mem returns GPAs for any vmie_mem,
sig_scan_sources scans several sources with per-source attribution, and
sig_from_bytes builds an exact needle from a byte span. The pure matcher is
unchanged; dumps and the live engine image are scanned uniformly, neither
needing the other.
lirent
