Reject SQL queries containing null characters by ever0de · Pull Request #5981 · RustPython/RustPython

youknowone

Walkthrough

A validation step was added to the Statement::new function in the SQLite module, ensuring that SQL statement strings containing null ('\0') characters are detected and rejected with a ProgrammingError. This check is performed after UTF-8 conversion and before further processing.

Changes

File(s)	Change Summary
stdlib/src/sqlite.rs	Added a check in `Statement::new` to reject SQL strings with null chars.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant Statement
    participant Error

    Caller->>Statement: new(sql_string)
    Statement->>Statement: Convert sql_string to UTF-8
    Statement->>Statement: Check for null ('\0') character
    alt Null character found
        Statement->>Error: Return ProgrammingError("statement contains a null character")
    else No null character
        Statement->>Statement: Proceed to C string conversion and statement preparation
    end
    Statement-->>Caller: Return result (Statement or Error)

Possibly related PRs

Introduce PyUtf8Str and fix(sqlite): validate surrogates in SQL statements #5969: Both PRs modify Statement::new to improve input validation, with one focusing on null character checks and the other on UTF-8 surrogate validation.

Suggested reviewers

youknowone

Poem

In the land of code where queries dwell,
A sneaky null char tried to cast its spell.
But now, with a check both sharp and bright,
No phantom bytes escape our sight!
🐇✨
Bugs beware—your tricks won't fare!

📜 Recent review details

Configuration used: .coderabbit.yml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a54873d and 062278e.

⛔ Files ignored due to path filters (1)

Lib/test/test_sqlite3/test_regression.py is excluded by !Lib/**

📒 Files selected for processing (1)

stdlib/src/sqlite.rs (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

**/*.rs

Instructions used from:

Sources:
📄 CodeRabbit Inference Engine

.github/copilot-instructions.md

🔇 Additional comments (1)

stdlib/src/sqlite.rs (1)

2298-2303: LGTM! Excellent security improvement that aligns with CPython behavior.

This validation correctly prevents SQL injection vulnerabilities that could arise from embedded null characters truncating SQL statements when converted to C strings. The check is well-positioned after UTF-8 conversion and before C string conversion, providing early failure with an appropriate ProgrammingError.

✨ Finishing Touches

📝 Generate Docstrings

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

🪧 Tips

Chat

There are 3 ways to chat with CodeRabbit:

Review comments: Directly reply to a review comment made by CodeRabbit. Example:
- I pushed a fix in commit <commit_id>, please review it.
- Explain this complex logic.
- Open a follow-up GitHub issue for this discussion.
Files and specific lines of code (under the "Files changed" tab): Tag @coderabbitai in a new review comment at the desired location with your query. Examples:
- @coderabbitai explain this code block.
- @coderabbitai modularize this function.
PR comments: Tag @coderabbitai in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
- @coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.
- @coderabbitai read src/utils.ts and explain its main purpose.
- @coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.
- @coderabbitai help me debug CodeRabbit configuration file.

Support

Need help? Create a ticket on our support page for assistance with any issues or questions.

Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments.

CodeRabbit Commands (Invoked using PR comments)

@coderabbitai pause to pause the reviews on a PR.
@coderabbitai resume to resume the paused reviews.
@coderabbitai review to trigger an incremental review. This is useful when automatic reviews are disabled for the repository.
@coderabbitai full review to do a full review from scratch and review all the files again.
@coderabbitai summary to regenerate the summary of the PR.
@coderabbitai generate docstrings to generate docstrings for this PR.
@coderabbitai generate sequence diagram to generate a sequence diagram of the changes in this PR.
@coderabbitai resolve resolve all the CodeRabbit review comments.
@coderabbitai configuration to show the current CodeRabbit configuration for the repository.
@coderabbitai help to get help.

Other keywords and placeholders

Add @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.
Add @coderabbitai summary to generate the high-level summary at a specific location in the PR description.
Add @coderabbitai anywhere in the PR title to generate the title automatically.

Documentation and Community

Visit our Documentation for detailed information on how to use CodeRabbit.
Join our Discord Community to get help, request features, and share feedback.
Follow us on X/Twitter for updates and announcements.