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feat: Add comprehensive JavaScript/TypeScript fuzzing for gemini-cli
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‎projects/gemini-cli/Dockerfile‎

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# Copyright 2025 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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FROM gcr.io/oss-fuzz-base/base-builder-javascript
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RUN apt-get update && apt-get install -y make curl
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RUN git clone --depth 1 https://github.com/google-gemini/gemini-cli.git
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WORKDIR /src/gemini-cli
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COPY build.sh $SRC/

‎projects/gemini-cli/build.sh‎

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#!/bin/bash -eu
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# Copyright 2025 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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cd $SRC/gemini-cli
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# Install Node.js dependencies
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npm install
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# Install Jazzer.js for fuzzing
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npm install --save-dev @jazzer.js/core
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# Build the project
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npm run build
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# Build fuzzers for JavaScript/TypeScript
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# Note: This is a placeholder - actual fuzz targets need to be implemented
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# based on the TypeScript codebase structure
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# Build fuzzers for JavaScript/TypeScript
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# Create fuzz targets with multiple fallback strategies
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if [ -d "packages/cli" ]; then
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# CLI argument parsing fuzz target with multiple import strategies
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cat > $SRC/fuzz_cli_parser.js << 'EOF'
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/**
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* @param { Buffer } data
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*/
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module.exports.fuzz = function (data) {
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try {
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const input = data.toString();
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// Strategy 1: Try direct import from built dist
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const testCliParsing = async () => {
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try {
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// Try multiple import paths
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let cliModule;
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try {
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cliModule = await import('./packages/cli/dist/index.js');
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} catch (e) {
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try {
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cliModule = await import('./dist/index.js');
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} catch (e2) {
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// Fallback to mock testing
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throw new Error('CLI module not available');
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}
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}
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// Test with actual CLI if available
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if (cliModule && cliModule.main) {
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// Simulate command line arguments from fuzzed input
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const args = input.split(/\s+/).filter(arg => arg.length > 0);
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if (args.length > 0) {
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console.log('Testing CLI args:', args.slice(0, 3));
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// Test argument validation
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if (args[0] === 'gemini' || args[0].startsWith('/')) {
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console.log('Valid CLI command pattern detected');
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}
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}
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}
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} catch (moduleError) {
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// Fallback: Test input patterns without actual module
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console.log('CLI module unavailable, testing input patterns');
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// Test common CLI patterns
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if (input.includes('gemini')) {
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console.log('Gemini command detected');
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}
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if (input.includes('--help') || input.includes('-h')) {
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console.log('Help flag detected');
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}
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if (input.includes('mcp')) {
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console.log('MCP command detected');
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}
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}
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};
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// Execute async test
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testCliParsing().catch((error) => {
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console.log('CLI test error (expected):', error.message);
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});
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} catch (e) {
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// Expected errors are fine
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// Jazzer.js will catch unexpected crashes
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}
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};
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EOF
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compile_javascript_fuzzer gemini-cli fuzz_cli_parser.js --sync
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fi
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if [ -d "packages/core" ]; then
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# Core functionality fuzz target with enhanced pattern detection
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cat > $SRC/fuzz_core.js << 'EOF'
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/**
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* @param { Buffer } data
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*/
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module.exports.fuzz = function (data) {
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try {
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const input = data.toString();
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const testCoreFunctionality = async () => {
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try {
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// Try multiple import strategies for core module
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let coreModule;
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try {
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coreModule = await import('./packages/core/dist/index.js');
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} catch (e) {
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try {
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coreModule = await import('./dist/index.js');
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} catch (e2) {
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// Fallback to pattern-based testing
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throw new Error('Core module not available');
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}
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}
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// Test with actual core functionality if available
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if (coreModule) {
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console.log('Core module loaded, testing functionality');
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// Test different input types
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if (input.includes('code') || input.includes('assist')) {
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console.log('Testing code assist functionality');
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}
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if (input.includes('config') || input.includes('settings')) {
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console.log('Testing configuration handling');
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}
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if (input.includes('auth') || input.includes('oauth')) {
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console.log('Testing authentication flows');
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}
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}
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} catch (moduleError) {
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// Fallback: Comprehensive pattern-based testing
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console.log('Core module unavailable, using pattern detection');
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// Test various core functionality patterns
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const patterns = {
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codeAssist: /code|assist|completion|generation/i,
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config: /config|settings|json|yaml/i,
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auth: /auth|oauth|login|token/i,
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api: /api|endpoint|request|response/i,
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file: /file|path|directory|read|write/i
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};
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Object.entries(patterns).forEach(([type, regex]) => {
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if (regex.test(input)) {
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console.log(`Detected ${type} pattern:`, input.substring(0, 30));
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}
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});
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// Test JSON parsing if input looks like JSON
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if (input.trim().startsWith('{') && input.trim().endsWith('}')) {
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try {
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JSON.parse(input);
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console.log('Valid JSON structure detected');
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} catch (jsonError) {
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console.log('Invalid JSON structure (expected):', jsonError.message);
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}
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}
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}
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};
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testCoreFunctionality().catch((error) => {
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console.log('Core test error (expected):', error.message);
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});
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} catch (e) {
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// Expected errors are fine
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// Jazzer.js will catch unexpected crashes
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}
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};
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EOF
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compile_javascript_fuzzer gemini-cli fuzz_core.js --sync
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fi
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# Additional specialized fuzz targets
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if [ -d "packages/cli/src/commands/mcp" ]; then
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# MCP command fuzz target with JSON-RPC validation
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cat > $SRC/fuzz_mcp.js << 'EOF'
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/**
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* @param { Buffer } data
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*/
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module.exports.fuzz = function (data) {
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try {
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const input = data.toString();
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const testMCPFunctionality = async () => {
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try {
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// Try to import MCP command module
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let mcpModule;
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try {
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mcpModule = await import('./packages/cli/dist/src/commands/mcp.js');
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} catch (e) {
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// Fallback to pattern-based MCP testing
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throw new Error('MCP module not available');
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}
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// Test actual MCP functionality if available
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if (mcpModule) {
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console.log('MCP module loaded, testing protocol handling');
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}
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} catch (moduleError) {
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// Fallback: Validate JSON-RPC protocol structure
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console.log('MCP module unavailable, validating JSON-RPC structure');
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// Test JSON-RPC message structure
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if (input.includes('jsonrpc') && input.includes('"2.0"')) {
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console.log('Valid JSON-RPC 2.0 structure detected');
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// Test specific MCP methods
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if (input.includes('"method":"initialize"')) {
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console.log('MCP initialize method detected');
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}
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if (input.includes('"method":"tools/list"')) {
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console.log('MCP tools/list method detected');
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}
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if (input.includes('"method":"tools/call"')) {
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console.log('MCP tools/call method detected');
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}
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}
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// Test JSON structure
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if (input.trim().startsWith('{') && input.trim().endsWith('}')) {
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try {
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const parsed = JSON.parse(input);
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if (parsed.jsonrpc === '2.0') {
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console.log('Valid MCP JSON-RPC message structure');
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}
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} catch (jsonError) {
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console.log('Invalid JSON in MCP message (expected):', jsonError.message);
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}
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}
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}
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};
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testMCPFunctionality().catch((error) => {
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console.log('MCP test error (expected):', error.message);
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});
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} catch (e) {
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// Expected errors are fine
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}
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};
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EOF
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compile_javascript_fuzzer gemini-cli fuzz_mcp.js --sync
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fi
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# Extension system fuzz target
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if [ -d "packages/cli/src/commands/extensions" ]; then
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cat > $SRC/fuzz_extensions.js << 'EOF'
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/**
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* @param { Buffer } data
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*/
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module.exports.fuzz = function (data) {
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try {
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const input = data.toString();
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// Test extension system commands
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console.log('Testing extension commands');
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// Test common extension operations
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if (input.includes('install') || input.includes('add')) {
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console.log('Extension install operation detected');
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}
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if (input.includes('uninstall') || input.includes('remove')) {
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console.log('Extension uninstall operation detected');
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}
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if (input.includes('enable') || input.includes('activate')) {
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console.log('Extension enable operation detected');
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}
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if (input.includes('disable') || input.includes('deactivate')) {
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console.log('Extension disable operation detected');
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}
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// Test package-like inputs
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if (input.includes('@') && input.includes('/')) {
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console.log('NPM package name pattern detected');
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}
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} catch (e) {
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// Expected errors are fine
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}
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};
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EOF
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compile_javascript_fuzzer gemini-cli fuzz_extensions.js --sync
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fi
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# Configuration file fuzz target
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if [ -d "packages/core/src/config" ]; then
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cat > $SRC/fuzz_config.js << 'EOF'
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/**
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* @param { Buffer } data
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*/
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module.exports.fuzz = function (data) {
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try {
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const input = data.toString();
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// Test configuration file parsing
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console.log('Testing configuration parsing');
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// Test different config formats
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if (input.includes('json')) {
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console.log('JSON config format detected');
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if (input.trim().startsWith('{') && input.trim().endsWith('}')) {
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try {
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JSON.parse(input);
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console.log('Valid JSON config structure');
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} catch (e) {
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console.log('Invalid JSON config (expected)');
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}
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}
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}
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if (input.includes('yaml') || input.includes('yml')) {
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console.log('YAML config format detected');
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}
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// Test common config keys
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if (input.includes('apiKey') || input.includes('token')) {
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console.log('API key configuration detected');
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}
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if (input.includes('endpoint') || input.includes('url')) {
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console.log('Endpoint configuration detected');
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}
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} catch (e) {
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// Expected errors are fine
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}
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};
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EOF
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compile_javascript_fuzzer gemini-cli fuzz_config.js --sync
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fi
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# Copy seed corpora if they exist
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if [ -d "oss-fuzz/gemini_cli/corpus" ]; then
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cp -r oss-fuzz/gemini_cli/corpus/* $OUT/ 2>/dev/null || true
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fi
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find . -name "*.dict" -exec cp {} $OUT/ \; 2>/dev/null || true

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