Fix #287: [milestone Milestone 12] POST /v1/verify/symbolic — Symbolic WASM execution endpoint: `{"module":"bas...

[telleroutlook]

Fixes #287

Generated by claude-bot-go worker.

[telleroutlook]

Summary

The PR does not appear safe to merge because it leaves an unused import and introduces uncontrolled symbolic-execution resource usage.

Severity

high

Blocking findings

1. cmd/symkerneld/routes_test.go:55 Removing the JSON decoding assertions leaves the existing encoding/json import unused, causing the package tests to fail compilation.
2. internal/verify/symbolic.go:187 Path branching recursively expands all feasible and infeasible states without a path-count or execution-budget limit; a user-supplied module with many nested symbolic branches can cause exponential memory/CPU exhaustion despite maxDepth.
3. internal/verify/symbolic.go:294 i32 arithmetic is evaluated using unbounded int64 arithmetic rather than WebAssembly i32 wraparound semantics, producing incorrect path conditions and outputs for overflow cases.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The PR does not appear safe to merge because it leaves an unused import and introduces uncontrolled symbolic-execution resource usage.",
  "findings": [
    {
      "file": "cmd/symkerneld/routes_test.go",
      "line": 55,
      "issue": "Removing the JSON decoding assertions leaves the existing encoding/json import unused, causing the package tests to fail compilation.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 187,
      "issue": "Path branching recursively expands all feasible and infeasible states without a path-count or execution-budget limit; a user-supplied module with many nested symbolic branches can cause exponential memory/CPU exhaustion despite maxDepth.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 294,
      "issue": "i32 arithmetic is evaluated using unbounded int64 arithmetic rather than WebAssembly i32 wraparound semantics, producing incorrect path conditions and outputs for overflow cases.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 1
}

[telleroutlook]

Summary

The PR weakens route coverage and introduces incorrect symbolic execution behavior that can return paths with invalid stack state.

Severity

high

Blocking findings

1. cmd/symkerneld/routes_test.go:64 The route test now accepts any status other than 404, so a broken handler returning 400, 500, or another incorrect response is treated as passing; this weakens CI coverage for the endpoint contract.
2. internal/verify/symbolic.go:173 When maxDepth is exceeded, the executor silently drops the state and increments pruned even when PruneInfeasible is false. This can cause incomplete exploration and incorrect results without indicating that execution was depth-limited.
3. internal/verify/symbolic.go:204 The executor validates result stack size only with len(state.stack) < len(fn.results), but does not reject extra stack values or validate that branch paths preserve the declared stack shape, allowing malformed execution results to be returned.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The PR weakens route coverage and introduces incorrect symbolic execution behavior that can return paths with invalid stack state.",
  "findings": [
    {
      "file": "cmd/symkerneld/routes_test.go",
      "line": 64,
      "issue": "The route test now accepts any status other than 404, so a broken handler returning 400, 500, or another incorrect response is treated as passing; this weakens CI coverage for the endpoint contract.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 173,
      "issue": "When maxDepth is exceeded, the executor silently drops the state and increments pruned even when PruneInfeasible is false. This can cause incomplete exploration and incorrect results without indicating that execution was depth-limited.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 204,
      "issue": "The executor validates result stack size only with len(state.stack) \u003c len(fn.results), but does not reject extra stack values or validate that branch paths preserve the declared stack shape, allowing malformed execution results to be returned.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 2
}

[telleroutlook]

Summary

The PR weakens route coverage and contains a symbolic-condition bug that rejects valid WebAssembly programs.

Severity

high

Blocking findings

1. cmd/symkerneld/routes_test.go:60 The route test now accepts every response except 404, so handler regressions returning 400, 500, or malformed success responses are no longer detected.
2. internal/verify/symbolic.go:106 condition() treats symbolic Boolean expressions from comparisons or eqz as integer expressions and emits constraints such as (= (< arg0 0) 0), which is invalid SMT and causes valid conditional Wasm programs to fail.
3. internal/verify/symbolic.go:75 MaxDepth is fully user-controlled and execution has no global path, module-size, request-body, CPU, or memory limit; branching modules can cause exponential resource exhaustion.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The PR weakens route coverage and contains a symbolic-condition bug that rejects valid WebAssembly programs.",
  "findings": [
    {
      "file": "cmd/symkerneld/routes_test.go",
      "line": 60,
      "issue": "The route test now accepts every response except 404, so handler regressions returning 400, 500, or malformed success responses are no longer detected.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 106,
      "issue": "condition() treats symbolic Boolean expressions from comparisons or eqz as integer expressions and emits constraints such as (= (\u003c arg0 0) 0), which is invalid SMT and causes valid conditional Wasm programs to fail.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 75,
      "issue": "MaxDepth is fully user-controlled and execution has no global path, module-size, request-body, CPU, or memory limit; branching modules can cause exponential resource exhaustion.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 3
}

[telleroutlook]

Summary

The implementation exposes an unbounded symbolic-execution resource-exhaustion risk through attacker-controlled module size, depth, and path branching.

Severity

high

Blocking findings

1. internal/verify/symbolic.go:70 MaxDepth is accepted without an upper bound, allowing callers to request arbitrarily deep exploration and consume excessive CPU or memory.
2. internal/verify/symbolic.go:143 Each symbolic branch recursively explores both paths and can grow exponentially, with no global path or resource limit beyond the attacker-controlled MaxDepth.
3. internal/verify/symbolic.go:651 The HTTP handler decodes the request body without applying a size limit, allowing arbitrarily large base64 WebAssembly modules and request bodies to cause memory exhaustion.
4. internal/verify/symbolic.go:431 Attacker-controlled WASM vector counts are used for slice capacities and allocations without practical bounds, enabling memory exhaustion before execution begins.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The implementation exposes an unbounded symbolic-execution resource-exhaustion risk through attacker-controlled module size, depth, and path branching.",
  "findings": [
    {
      "file": "internal/verify/symbolic.go",
      "line": 70,
      "issue": "MaxDepth is accepted without an upper bound, allowing callers to request arbitrarily deep exploration and consume excessive CPU or memory.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 143,
      "issue": "Each symbolic branch recursively explores both paths and can grow exponentially, with no global path or resource limit beyond the attacker-controlled MaxDepth.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 651,
      "issue": "The HTTP handler decodes the request body without applying a size limit, allowing arbitrarily large base64 WebAssembly modules and request bodies to cause memory exhaustion.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 431,
      "issue": "Attacker-controlled WASM vector counts are used for slice capacities and allocations without practical bounds, enabling memory exhaustion before execution begins.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 4
}

[telleroutlook]

Summary

The symbolic executor mishandles valid i32 overflow, producing incorrect branch feasibility and outputs for wraparound arithmetic.

Severity

high

Blocking findings

1. internal/verify/symbolic.go:367 i32.add, i32.sub, and i32.mul perform arithmetic in int64 without applying WebAssembly's 32-bit wrapping semantics, so paths involving overflow can be classified incorrectly.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The symbolic executor mishandles valid i32 overflow, producing incorrect branch feasibility and outputs for wraparound arithmetic.",
  "findings": [
    {
      "file": "internal/verify/symbolic.go",
      "line": 367,
      "issue": "i32.add, i32.sub, and i32.mul perform arithmetic in int64 without applying WebAssembly's 32-bit wrapping semantics, so paths involving overflow can be classified incorrectly.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 5
}

[telleroutlook]

Summary

The PR introduces a likely compile failure and incorrect symbolic semantics for WebAssembly integer inputs.

Severity

high

Blocking findings

1. cmd/symkerneld/routes_test.go:55 The removed JSON decoding leaves the existing encoding/json import unused, causing the package tests to fail compilation.
2. internal/verify/symbolic.go:106 Function parameters are modeled as unbounded Z3 Int values, but WebAssembly i32/i64 parameters have fixed-width wrapping and signed semantics, producing incorrect feasibility results for overflow and out-of-range models.
3. internal/verify/symbolic.go:33 Replacing WasmBinary, Entry, and Args with Module, Entrypoint, MaxDepth, and PruneInfeasible breaks the existing exported SymbolicInput API without a documented compatibility or migration path.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The PR introduces a likely compile failure and incorrect symbolic semantics for WebAssembly integer inputs.",
  "findings": [
    {
      "file": "cmd/symkerneld/routes_test.go",
      "line": 55,
      "issue": "The removed JSON decoding leaves the existing encoding/json import unused, causing the package tests to fail compilation.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 106,
      "issue": "Function parameters are modeled as unbounded Z3 Int values, but WebAssembly i32/i64 parameters have fixed-width wrapping and signed semantics, producing incorrect feasibility results for overflow and out-of-range models.",
      "kind": "blocker"
    },
    {
      "file": "internal/verify/symbolic.go",
      "line": 33,
      "issue": "Replacing WasmBinary, Entry, and Args with Module, Entrypoint, MaxDepth, and PruneInfeasible breaks the existing exported SymbolicInput API without a documented compatibility or migration path.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 6
}

[telleroutlook]

Summary

Valid modules with non-function imports are incorrectly rejected during entrypoint resolution.

Severity

medium

Blocking findings

1. internal/verify/symbolic.go:648 The import section count includes all import kinds, but WebAssembly function indices are offset only by imported functions. A module importing memory or a table before a local exported function will be treated as having an imported function and incorrectly rejected.

Verdict

❌ Rejected

Merge risk

medium

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "medium",
  "summary": "Valid modules with non-function imports are incorrectly rejected during entrypoint resolution.",
  "findings": [
    {
      "file": "internal/verify/symbolic.go",
      "line": 648,
      "issue": "The import section count includes all import kinds, but WebAssembly function indices are offset only by imported functions. A module importing memory or a table before a local exported function will be treated as having an imported function and incorrectly rejected.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "medium",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 7
}

[telleroutlook]

Summary

The symbolic executor has a correctness bug in branch parsing that can silently mis-handle nested or malformed if/else blocks, making merge unsafe.

Severity

high

Blocking findings

1. internal/verify/symbolic.go:916 When parsing an if instruction, the parser ignores the stop opcode returned by the nested parser and detects an else solely by checking b[p-1]. This can misassociate nested else/end delimiters and accept malformed control flow, producing incorrect execution paths instead of rejecting the module.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The symbolic executor has a correctness bug in branch parsing that can silently mis-handle nested or malformed if/else blocks, making merge unsafe.",
  "findings": [
    {
      "file": "internal/verify/symbolic.go",
      "line": 916,
      "issue": "When parsing an if instruction, the parser ignores the stop opcode returned by the nested parser and detects an else solely by checking b[p-1]. This can misassociate nested else/end delimiters and accept malformed control flow, producing incorrect execution paths instead of rejecting the module.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 8
}

[telleroutlook]

Summary

The PR introduces a likely public API break by removing the exported ErrNotImplemented symbol without documenting the compatibility impact.

Severity

high

Blocking findings

1. internal/verify/symbolic.go:25 The exported ErrNotImplemented variable is removed. Any existing Go callers or downstream tests that reference verify.ErrNotImplemented will no longer compile, and the issue does not describe this public API break.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The PR introduces a likely public API break by removing the exported ErrNotImplemented symbol without documenting the compatibility impact.",
  "findings": [
    {
      "file": "internal/verify/symbolic.go",
      "line": 25,
      "issue": "The exported ErrNotImplemented variable is removed. Any existing Go callers or downstream tests that reference verify.ErrNotImplemented will no longer compile, and the issue does not describe this public API break.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 9
}

[telleroutlook]

Summary

The PR introduces an undocumented breaking change to exported symbolic result types, removing Model and changing Constraints from string to []string.

Severity

high

Blocking findings

1. internal/verify/symbolic.go:64 SymbolicPath changes the exported Constraints field type from string to []string and removes the exported Model field, breaking existing Go callers without an issue-specified migration or compatibility layer.

Verdict

❌ Rejected

Merge risk

high

Audit

• model: opus
• effort: high
• tokens: input=0, output=0

{
  "approved": false,
  "severity": "high",
  "summary": "The PR introduces an undocumented breaking change to exported symbolic result types, removing Model and changing Constraints from string to []string.",
  "findings": [
    {
      "file": "internal/verify/symbolic.go",
      "line": 64,
      "issue": "SymbolicPath changes the exported Constraints field type from string to []string and removes the exported Model field, breaking existing Go callers without an issue-specified migration or compatibility layer.",
      "kind": "blocker"
    }
  ],
  "merge_risk": "high",
  "Model": "opus",
  "model": "codex",
  "effort": "high",
  "tokens": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "same_verdict_count": 10
}

[telleroutlook]

Summary

The PR successfully implements the Z3-backed Wasm symbolic execution engine and endpoint handler with comprehensive bounds checking and test coverage.

Severity

none

Blocking findings

None.

Verdict

✅ Approved

Merge risk

low

Audit

• model: opus
• effort: high
• tokens: input=57236, output=11031

{
  "approved": true,
  "severity": "none",
  "summary": "The PR successfully implements the Z3-backed Wasm symbolic execution engine and endpoint handler with comprehensive bounds checking and test coverage.",
  "findings": [],
  "merge_risk": "low",
  "Model": "opus",
  "model": "agy",
  "effort": "high",
  "tokens": {
    "input_tokens": 57236,
    "output_tokens": 11031
  },
  "same_verdict_count": 1
}