Firefox3.1/JSONSecurityReview

Overview

Describe the goals and objectives of the feature here.

Background links

• [Bug 340987] Implement JSON extensions to the JS language.
• [| ES5 - Section 15.12 The JSON Object]

Security and Privacy

• Is this feature a security feature?
  • No, other than giving developers an option to avoid using eval to parse JSON.

• What potential security issues in your feature have you already considered and addressed?
  • Mostly DOS issues and unintended modification of JS objects.
• Is system or subsystem security compromised in any way if your project's configuration files / prefs are corrupt or missing?
  • No.
• Include a thorough description of the security assumptions, capabilities and any potential risks (possible attack points) being introduced by your project.
  • The main risk would be a way to squeeze code (JS functions, etc) through the parser. The grammar is pretty strict, and we have many tests covering a variety of valid and invalid JSON.
• How are transitions in/out of Private Browsing mode handled?
  • Not relevant.

Exported APIs

• Please provide a table of exported interfaces (APIs, ABIs, protocols, UI, etc.)
  • Some additions to jsapi.h
• Does it interoperate with a web service? How will it do so?
  • No.

Module interactions

• What other modules are used (REQUIRES in the makefile, interfaces)?
  • Only SpiderMonkey dependencies.

Data

• What data is read or parsed by this feature?
  • JSON data.
• What is the output of this feature?
  • Either a string containing JSON or a JS value parsed from a JSON string.

Reliability

• What failure modes or decision points are presented to the user?
  • JS Exceptions
• Can its files be corrupted by failures? Does it clean up any locks/files after crashes?
  • It can hold GC roots if the caller fails to call the parser clean up function.