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Summary of Changes
Hello @branedev2, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request significantly expands the C++ CodeQL security analysis capabilities by integrating a broad spectrum of new queries. It establishes a foundational CMake setup for C++ CodeQL projects and provides extensive documentation and illustrative code examples for each identified vulnerability, aiming to improve the detection and understanding of common security weaknesses in C++ applications.
Highlights
- Build Configuration: Introduced a new CMake build configuration (
CMakeLists.txt) specifically tailored for C++ CodeQL projects, setting up executable targets, C++ standard, include directories, and linking necessary libraries likesqlite3. - Comprehensive Security Queries: Added a wide array of new CodeQL security queries targeting numerous Common Weakness Enumerations (CWEs) relevant to C++ development. These cover categories such as buffer overflows (CWE-119, CWE-120, CWE-131), integer overflows (CWE-190), injection vulnerabilities (CWE-078, CWE-089, CWE-134), insecure data handling (CWE-014, CWE-020, CWE-079, CWE-416, CWE-497), race conditions (CWE-367), and various other security misconfigurations (CWE-295, CWE-319, CWE-326, CWE-676, CWE-732, CWE-764).
- Detailed Documentation and Examples: Provided extensive QLHelp documentation (
.qhelpfiles) for each new security query. This documentation explains the vulnerability, offers recommendations for remediation, and includes illustrative C++ code examples (-bad.cpp,-good.cpp,Example.cpp) to demonstrate both insecure and secure coding practices. - Expanded CodeQL Libraries: Integrated new QLL libraries (
.qllfiles) to support the advanced security checks. These libraries include specialized data flow and taint tracking configurations, as well as definitions for identifying safe external API functions and system data, enhancing the precision and scope of the analyses.
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Code Review
This pull request adds a significant number of new files, primarily C++ examples for CodeQL queries and their associated documentation. While the new queries and documentation appear to be in good order, many of the C++ example files contain fundamental correctness issues. These include using uninitialized variables, missing necessary header files, and buffer handling errors, which would prevent them from compiling or lead to undefined behavior. I've highlighted a representative set of these issues in the comments. A thorough review and correction of all new C++ example files is recommended to ensure they are valid and serve as clear, correct illustrations for the queries.
| char buffer[1024]; | ||
| strcat(buffer, "SELECT * FROM user WHERE user_id='"); | ||
| strcat(buffer, user_id); | ||
| strcat(buffer, "'"); |
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The buffer is not initialized before being used as the destination for strcat on line 11. This is undefined behavior. The buffer should be initialized, for example to an empty string.
Furthermore, the sequence of strcat calls is vulnerable to buffer overflows. A safer alternative like snprintf should be used to prevent writing past the end of the buffer.
| char buffer[1024]; | |
| strcat(buffer, "SELECT * FROM user WHERE user_id='"); | |
| strcat(buffer, user_id); | |
| strcat(buffer, "'"); | |
| char buffer[1024]; | |
| snprintf(buffer, sizeof(buffer), "SELECT * FROM user WHERE user_id='%s'", user_id); |
| int SSL_get_verify_result(char* ssl) { | ||
| return NULL; | ||
| } |
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The function SSL_get_verify_result is declared to return int, but the implementation returns NULL. This will cause a compilation error. It should return an integer value.
| int SSL_get_verify_result(char* ssl) { | |
| return NULL; | |
| } | |
| int SSL_get_verify_result(char* ssl) { | |
| return 0; // or some other integer | |
| } |
| @@ -0,0 +1,27 @@ | |||
| #include <iostream> | |||
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This file is missing the <ctime> header for time-related functions like time_t, time, gmtime, and gmtime_r, and a header for NULL (like <cstddef>). This will cause compilation errors.
| #include <iostream> | |
| #include <iostream> | |
| #include <ctime> | |
| #include <cstddef> |
| #include <iostream> | ||
| #include <cstring> |
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This file is missing necessary includes for FILENAME_MAX and fopen, which are defined in <cstdio>. This will cause a compilation error.
| #include <iostream> | |
| #include <cstring> | |
| #include <iostream> | |
| #include <cstring> | |
| #include <cstdio> |
| } | ||
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| int main() { | ||
| int MAX_PASSWORD_LENGTH; |
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The variable MAX_PASSWORD_LENGTH is declared but not initialized. Using it to declare the size of the password array on line 14 results in undefined behavior, as the array will be created with an indeterminate size. This is a critical correctness and security issue, even in this 'good' example file.
| int MAX_PASSWORD_LENGTH; | |
| const int MAX_PASSWORD_LENGTH = 128; // Or another appropriate size |
| add_executable(myexec ${PROJECT_SOURCES}) | ||
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| # Specify C++ standard | ||
| set(CMAKE_CXX_STANDARD 11) |
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Setting CMAKE_CXX_STANDARD globally is an older practice. For better modularity and to ensure properties are correctly scoped to their targets, it's recommended to set the C++ standard on a per-target basis using target_compile_features or by setting the CXX_STANDARD property on the target.
target_compile_features(myexec PUBLIC cxx_std_11)
| </li> | ||
| <li> | ||
| USENIX: The Advanced Computing Systems Association: | ||
| <a href="https://www.usenix.org/system/files/conference/usenixsecurity17/sec17-yang.pdf">Dead Store Elimination (Still) Considered Harmfuls</a> |
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There appears to be a typo in the linked article's title. "Harmfuls" should likely be "Harmful".
<a href="https://www.usenix.org/system/files/conference/usenixsecurity17/sec17-yang.pdf">Dead Store Elimination (Still) Considered Harmful</a>
| <example> | ||
| <p>The following program fragment uses <code>memset</code> to erase sensitive information after it is no | ||
| longer needed:</p> | ||
| <sample src="MemsetMayBeDeleted-bad.c" /> |
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The sample source file is referenced with a .c extension, but the actual file is a C++ file (.cpp). This should be corrected for consistency and to avoid confusion.
<sample src="MemsetMayBeDeleted-bad.cpp" />
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| </recommendation> | ||
| <example> | ||
| <sample src="IncorrectAllocationErrorHandling.cpp" /> |
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The sample file IncorrectAllocationErrorHandling.cpp referenced here appears to be entirely commented out. This will prevent it from being displayed as a code sample.
| target_link_libraries(myexec sqlite3) | ||
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| # Enable debugging symbols | ||
| set(CMAKE_BUILD_TYPE Debug) |
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Hardcoding CMAKE_BUILD_TYPE in the CMakeLists.txt file is not recommended. This prevents users from easily configuring different build types (e.g., Release, RelWithDebInfo) from the command line. The build type should typically be specified by the user when invoking CMake.
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