qvm: recover userinfo lookup and buffer selection

docs/FINDINGS.md

@@ -1679,3 +1679,6 @@ RE-813–822 replaces the scoreboard decimal assumption with actual37914 executi
 
 
 **RE-893:** Rust matches64 continuous original6939/249007/246963 compositions. Independent max-clients/live-level bounds preserve score-reset, session-write and final connection-scan ordering; supplied first-child field/connection changes are staged with global/cvar intentions. Invalid counts reject without partial state commits. Native first child, bot/map-list callbacks and engine persistence remain open. [Evidence](research/RUST_NORMAL_MAP_SESSION.md).
+
+
+**RE-894:** 96 actual70503 cases execute actual36038/69386, recovering optional leading separator, case-insensitive first-match keys, incomplete-pair rejection, empty values, embedded NUL and null-pointer early exits. Non-null calls XOR the two-buffer selector even on misses; null arguments preserve it. Oversized info fatal/aliasing/native userinfo retrieval remain open. [Evidence](research/QVM_INFO_LOOKUP.md).

docs/PROVISIONAL_TODO.md

@@ -1713,3 +1713,6 @@ RE-893: Rust matches64 continuous original6939/249007/246963 compositions. Indep
 
 
 RE-884–893 completed bounded queried spawn/camera and map persistence compositions. RE-894 tracks saved-position behavior, restore, native collision and full runtime integration. [Batch and remaining tasks](research/QVM_QUERIED_PERSISTENCE_BATCH.md).
+
+
+RE-894: 96 actual70503 cases execute actual36038/69386, recovering optional leading separator, case-insensitive first-match keys, incomplete-pair rejection, empty values, embedded NUL and null-pointer early exits. Non-null calls XOR the two-buffer selector even on misses; null arguments preserve it. Oversized info fatal/aliasing/native userinfo retrieval remain open. Full runtime completion remains open. [Evidence](research/QVM_INFO_LOOKUP.md).

docs/RESEARCH_LEDGER.md

@@ -2180,3 +2180,8 @@ Rust matches64 continuous original6939/249007/246963 compositions. Independent m
 ### RE-884–893 full batch validation (2026-10-28)
 
 After the tenth commit, `cargo xtask test-full --since b9a94452` passed with the flake-declared Nix Python: 1,738 Python tests,188 Rust tests (assets10, gameplay148, xtask30),33 affected report producers regenerated twice deterministically, storage policy,458 documentation link checks and whitespace guards. No generated-report drift. Ten task commits sinceb9a94452; results are amended into the tenth commit. [Findings and next work](research/QVM_QUERIED_PERSISTENCE_BATCH.md).
+
+
+## 2026-10-28 — RE-894 Original userinfo key lookup and alternating buffers
+
+96 actual70503 cases execute actual36038/69386, recovering optional leading separator, case-insensitive first-match keys, incomplete-pair rejection, empty values, embedded NUL and null-pointer early exits. Non-null calls XOR the two-buffer selector even on misses; null arguments preserve it. Oversized info fatal/aliasing/native userinfo retrieval remain open. Focused `cargo xtask test-group qvm-info-lookup` passes (4 Python tests); selected reports regenerate twice deterministically, with storage, documentation links and whitespace guards. Full suite deferred to task ten. Original assets unchanged; source fixtures do not establish complete native/runtime parity.

docs/REVERSE_ENGINEERING_TODO.md

@@ -1750,3 +1750,6 @@ Purpose: turn the supplied installation into an evidence-backed specification of
 
 
 - [ ] RE-894 Recover saved-position/session restore/native collision and complete map/intermission/runtime ownership ([next tasks](research/QVM_QUERIED_PERSISTENCE_BATCH.md)).
+
+
+- [x] RE-894 Original userinfo key lookup and alternating buffers ([evidence](research/QVM_INFO_LOOKUP.md)).

docs/research/QVM_INFO_LOOKUP.md

@@ -0,0 +1,7 @@
+# Original userinfo key lookup and alternating buffers
+
+RE-894. Reproduce with `python3 scripts/analyze_qvm_info_lookup.py`; focused validation: `cargo xtask test-group qvm-info-lookup`. [Machine report](qvm-info-lookup.json).
+
+96 actual70503 cases execute actual36038/69386, recovering optional leading separator, case-insensitive first-match keys, incomplete-pair rejection, empty values, embedded NUL and null-pointer early exits. Non-null calls XOR the two-buffer selector even on misses; null arguments preserve it. Oversized info fatal/aliasing/native userinfo retrieval remain open.
+
+Original executable/native runtime and complete Linux/macOS Rust/Bevy/Solari acceptance remain unverified.

docs/research/README.md

@@ -1285,3 +1285,6 @@ The extension collector adds five focused tests for native tail calls, command-r
 
 
 [RE-884–893 queried spawn/camera and persistence batch](QVM_QUERIED_PERSISTENCE_BATCH.md).
+
+
+[RE-894: Original userinfo key lookup and alternating buffers](QVM_INFO_LOOKUP.md).

docs/research/qvm-info-lookup.json

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+        "8aeb21a90ad388f21e98968f300da50e1aaae933ddc0af8ac1311db818de3511"
+      ],
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+        "8aeb21a90ad388f21e98968f300da50e1aaae933ddc0af8ac1311db818de3511"
+      ],
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+        "b0333a27ad96817d6d59f470dd6a2afab9d481d5e2b76a818112492ca328d8f4"
+      ],
+      "execution": {
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+        "trace_length": 645,
+        "trace_sha256": "842ea1ce4f262bf291244b491baef3f80c6489d62a8b8d38aba61a5c2685a4f8"
+      },
+      "found": true,
+      "input": {
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+        "text": "5c615c625c636c5f677569645c71007461696c"
+      },
+      "ring": 1,
+      "value": "71"
+    },
+    {
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+        },
+        {
+          "address": 2073575472,
+          "after": 2073690126,
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+      ],
+      "comparisons": [
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+        "b0333a27ad96817d6d59f470dd6a2afab9d481d5e2b76a818112492ca328d8f4"
+      ],
+      "execution": {
+        "stop": 70709,
+        "trace_length": 645,
+        "trace_sha256": "842ea1ce4f262bf291244b491baef3f80c6489d62a8b8d38aba61a5c2685a4f8"
+      },
+      "found": true,
+      "input": {
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+        "text": "5c615c625c636c5f677569645c71007461696c"
+      },
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+      "value": "71"
+    },
+    {
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+        "f57ec4126119191914fb6e1e1e772c726297ee886716a83f996b0a105f0a00c4"
+      ],
+      "execution": {
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+        "trace_sha256": "842ea1ce4f262bf291244b491baef3f80c6489d62a8b8d38aba61a5c2685a4f8"
+      },
+      "found": true,
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+        "f57ec4126119191914fb6e1e1e772c726297ee886716a83f996b0a105f0a00c4"
+      ],
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+      },
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+      },
+      "ring": 0,
+      "value": "71"
+    },
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+        {
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+        }
+      ],
+      "comparisons": [
+        "e1ffd52310458596675d2d43a59edd247233bdf872f3e5a8667ea111a2765525",
+        "e1ffd52310458596675d2d43a59edd247233bdf872f3e5a8667ea111a2765525"
+      ],
+      "execution": {
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+        "trace_length": 648,
+        "trace_sha256": "eb807f6a6748acd191b41fc258fc473a7f6f933e05b0d48e20e5543244e847d6"
+      },
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+      },
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+        "e1ffd52310458596675d2d43a59edd247233bdf872f3e5a8667ea111a2765525"
+      ],
+      "execution": {
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+        "trace_length": 648,
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+      },
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+        "8aeb21a90ad388f21e98968f300da50e1aaae933ddc0af8ac1311db818de3511"
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+        "trace_length": 648,
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+      },
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+        "text": "5c615c625c636c5f677569645c71007461696c"
+      },
+      "ring": 1,
+      "value": ""
+    },
+    {
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+        },
+        {
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+          "after": 2073690126,
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+        }
+      ],
+      "comparisons": [
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+        "8aeb21a90ad388f21e98968f300da50e1aaae933ddc0af8ac1311db818de3511"
+      ],
+      "execution": {
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+        "trace_length": 648,
+        "trace_sha256": "eb807f6a6748acd191b41fc258fc473a7f6f933e05b0d48e20e5543244e847d6"
+      },
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+        "text": "5c615c625c636c5f677569645c71007461696c"
+      },
+      "ring": 0,
+      "value": ""
+    }
+  ],
+  "root": 70503,
+  "sha256": "a589351dfe517470a1b121dd2164714987d9e4577bf00c6486e1540035d7a79d",
+  "source": {
+    "archive": "zUrT43_qvm.pk3",
+    "archive_sha256": "b59bf0c5bedf11d50e0edd220da7eade96de40601e98ae14c54c819047df0796",
+    "member": {
+      "bytes": 983300,
+      "comment_hex": "",
+      "compressed_bytes": 246560,
+      "compression": 8,
+      "crc32": "98ea1768",
+      "create_system": 0,
+      "create_version": 63,
+      "date_time": [
+        2018,
+        6,
+        18,
+        22,
+        11,
+        50
+      ],
+      "directory": false,
+      "entry_index": 2,
+      "external_attr": 32,
+      "extra_hex": "0a0020000000000001001800d1e24e974007d40116dcbf962f1fd20116dcbf962f1fd201",
+      "extract_version": 20,
+      "flags": 0,
+      "header_offset": 221309,
+      "internal_attr": 0,
+      "occurrence": 0,
+      "output": "assets/extracted/zUrT43_qvm.pk3/members/000002/vm/qagame.qvm",
+      "path": "vm/qagame.qvm",
+      "sha256": "a589351dfe517470a1b121dd2164714987d9e4577bf00c6486e1540035d7a79d",
+      "type": "member",
+      "volume": 0
+    }
+  }
+}

scripts/analyze_qvm_info_lookup.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+"""Execute the verified original QVM body; native effects are supplied or captured."""
+import itertools
+from pathlib import Path
+from qvm_research_support import source,constants
+from qvm_camera_world_support import B,run
+from qvm_exit_rules_support import POOL,CPOOL
+from analyze_qvm_acceleration import word,number
+from analyze_qvm import write_json
+
+def main():
+ q,raw,h,ins=source();rows=[]
+ from qvm_persistence_support import INFO,KEY,info_lookup
+ from qvm_map_commands_support import put_string
+ from qvm_string_memory_support import cstring
+ texts=[None,b'',b'\\cl_guid\\abc',b'cl_guid\\first\\CL_GUID\\second',b'\\x\\1\\cl_guid\\ABC\\z\\2',b'\\cl_guid\\',b'\\cl_guid',b'\\a\\b\\cl_guid\\q\0tail']
+ for text,key,ring in itertools.product(texts,[None,b'',b'cl_guid',b'CL_GUID',b'x',b'\xff'],[0,1]):
+  m={23712:ring};b={};put_string(m,b,55552,b'')
+  if text is not None:put_string(m,b,INFO,text)
+  if key is not None:put_string(m,b,KEY,key)
+  m,v,p,b=info_lookup(ins,m,b,{8:0 if text is None else INFO,12:0 if key is None else KEY});p.update(input=dict(text=None if text is None else text.hex(),key=None if key is None else key.hex(),ring=ring),value=cstring(m,b,v).hex(),found=v!=55552,ring=m[23712]&0xffffffff);rows.append(p)
+
+ write_json(Path('docs/research/qvm-info-lookup.json'),{'source':q['source'],'sha256':q['sha256'],'root':70503,'probes':rows,'limits':'96 actual70503 cases execute actual36038/69386, recovering optional leading separator, case-insensitive first-match keys, incomplete-pair rejection, empty values, embedded NUL and null-pointer early exits. Non-null calls XOR the two-buffer selector even on misses; null arguments preserve it. Oversized info fatal/aliasing/native userinfo retrieval remain open.'})
+if __name__=='__main__':main()

scripts/qvm_persistence_support.py

@@ -0,0 +1,13 @@
+"""Recovered userinfo, scanning and saved-position boundaries."""
+from qvm_camera_world_support import B,run,casecmp
+from qvm_string_memory_support import cstring,strlen
+from qvm_map_commands_support import put_string
+INFO=B+0x40000
+KEY=INFO+0x4000
+OUT=KEY+0x4000
+
+def info_lookup(ins,m,b,args):
+ comparisons=[]
+ def compare(i,m,a,bs):
+  m,v,p,b=casecmp(i,m,a,dict(bs),base=B+0x26000);comparisons.append(p['execution']['trace_sha256']);return m,v,{'actual_source_child':69386}
+ m,v,p,b=run(ins,m,70503,70729,8232,args,b,{36038:strlen,69386:compare},base=B+0x22000);p.update(comparisons=comparisons);return m,v,p,b

scripts/test_qvm_info_lookup.py

@@ -0,0 +1,15 @@
+import json,unittest
+from pathlib import Path
+class OriginalTests(unittest.TestCase):
+ def test_instruction_results(self):
+  rows=json.loads(Path('docs/research/qvm-info-lookup.json').read_text())['probes']
+  self.assertEqual(len(rows),96)
+  for p in rows:
+   a=p['input'];found=False;value=b'';ring=a['ring']
+   if a['text'] is not None and a['key'] is not None:
+    ring^=1;text=bytes.fromhex(a['text']).split(b'\0')[0];key=bytes.fromhex(a['key']).split(b'\0')[0];text=text[1:] if text.startswith(b'\\') else text;parts=text.split(b'\\')
+    for j in range(0,len(parts)-1,2):
+     if parts[j].upper()==key.upper():found=True;value=parts[j+1];break
+   self.assertEqual(p['ring'],ring);self.assertEqual(p['found'],found);self.assertEqual(p['value'],value.hex())
+
+if __name__=='__main__':unittest.main()

xtask/checks.tsv

@@ -2707,3 +2707,8 @@ report	scripts/analyze_rust_normal_map_session.py	docs/research/rust-normal-map-
 edge	docs/research/rust-normal-map-session.json	scripts/test_rust_normal_map_session.py
 group	rust-normal-map-session	scripts/analyze_rust_normal_map_session.py
 edge	scripts/analyze_rust_normal_map_session.py	scripts/analyze_qvm_resumer_audit.py
+report	scripts/analyze_qvm_info_lookup.py	docs/research/qvm-info-lookup.json
+edge	docs/research/qvm-info-lookup.json	scripts/test_qvm_info_lookup.py
+group	qvm-info-lookup	scripts/analyze_qvm_info_lookup.py
+edge	scripts/analyze_qvm_info_lookup.py	scripts/analyze_qvm_resumer_audit.py
+edge	scripts/qvm_persistence_support.py	scripts/analyze_qvm_resumer_audit.py