xenia-rs/audit-runs/audit-023-canary-diff/diff_canary_ours.py

#!/usr/bin/env python3
"""
Compare canary's memory dump (Memory::Save format) against our --dump-addr
output for a list of target addresses. Output unified diff highlighting
divergent 4-byte words.
"""
import re
import struct
import sys
sys.path.insert(0, '/home/fabi/RE Project Sylpheed/xenia-rs/audit-runs/audit-023-canary-diff')
from parse_dump import parse, read_addr

DUMP_LOG_RE = re.compile(r'^\s*addr=0x([0-9a-fA-F]+)\s*$')
DUMP_LINE_RE = re.compile(r'^\s*\+0x([0-9a-fA-F]+):\s*((?:[0-9a-f]{2} ){15}[0-9a-f]{2})')

def parse_ours_log(path):
    """Parse ours' dump-addr log into {addr -> bytes}."""
    with open(path) as f:
        cur_addr = None
        cur_bytes = bytearray()
        out = {}
        for line in f:
            m = DUMP_LOG_RE.match(line)
            if m:
                if cur_addr is not None and cur_bytes:
                    out[cur_addr] = bytes(cur_bytes)
                cur_addr = int(m.group(1), 16)
                cur_bytes = bytearray()
                continue
            m = DUMP_LINE_RE.match(line)
            if m and cur_addr is not None:
                hexbytes = m.group(2).split()
                cur_bytes.extend(int(b, 16) for b in hexbytes)
        if cur_addr is not None and cur_bytes:
            out[cur_addr] = bytes(cur_bytes)
    return out

def fmt(addr, bytes_):
    """Return list of (offset, [4*be32 strings]) tuples."""
    rows = []
    for i in range(0, len(bytes_), 16):
        row = bytes_[i:i+16]
        words = []
        for w in range(0, len(row), 4):
            if w + 4 <= len(row):
                words.append(f"{struct.unpack('>I', row[w:w+4])[0]:08x}")
        rows.append((addr + i, words))
    return rows

def main():
    canary_dump = sys.argv[1] if len(sys.argv) > 1 else '/tmp/audit-023-canary-memory.dump'
    ours_log = sys.argv[2] if len(sys.argv) > 2 else '/home/fabi/RE Project Sylpheed/xenia-rs/audit-runs/audit-023-canary-diff/ours-dump.log'
    extra_log = sys.argv[3] if len(sys.argv) > 3 else '/home/fabi/RE Project Sylpheed/xenia-rs/audit-runs/audit-023-canary-diff/ours-extra.log'

    heap_index, data = parse(canary_dump)
    print()
    ours = parse_ours_log(ours_log)
    if extra_log:
        try:
            ours.update(parse_ours_log(extra_log))
        except FileNotFoundError:
            pass

    diffs_total = 0
    for addr in sorted(ours.keys()):
        our_bytes = ours[addr]
        n = len(our_bytes)
        canary_bytes, name, _, _, status = read_addr(heap_index, data, addr, n)
        print(f"\n=== addr {addr:#010x} (canary heap={name} status={status}) ===")
        if canary_bytes is None:
            print(f"   canary: {status}")
            continue
        canary_rows = fmt(addr, canary_bytes)
        our_rows = fmt(addr, our_bytes)
        for (a1, w1), (a2, w2) in zip(canary_rows, our_rows):
            assert a1 == a2
            diff_marks = []
            for c, o in zip(w1, w2):
                if c == o:
                    diff_marks.append("    ")
                else:
                    diff_marks.append(" !! ")
            row_has_diff = any(c != o for c, o in zip(w1, w2))
            if row_has_diff:
                diffs_total += 1
            canary_line = " ".join(w1)
            our_line = " ".join(w2)
            mark = "DIFF " if row_has_diff else "     "
            print(f"  {mark}+{a1-addr:04x}  canary: {canary_line}")
            print(f"  {mark}        ours  : {our_line}")
            if row_has_diff:
                marks = "".join(f"  {m}    " for m in diff_marks).rstrip()
                # Print marker line if useful
                # print(f"             {marks}")
    print(f"\n=== TOTAL DIFFERING ROWS: {diffs_total} ===")

if __name__ == "__main__":
    main()