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Full RELRO is a hardening feature that makes it impossible to perform certian attacks involving overwriting parts of the Global Offset Table to invoke arbitrary code. It requires all symbols to be resolved before execution of the program starts which may have an impact on startup time. However most if not all popular Linux distributions enable full RELRO by default for all binaries and this does not seem to make a noticeable difference in practice. "Partial RELRO" is equivalent to `-z relro -z lazy`. "Full RELRO" is equivalent to `-z relro -z now`. LLD defaults to `-z relro -z lazy`, which means Zig's current `-z relro` option has no effect on LLD's behavior. The changes made by this commit are as follows: - Document that `-z relro` is the default and add `-z norelro`. - Pass `-z now` to LLD by default to enable full RELRO by default. - Add `-z lazy` to disable passing `-z now`.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
Resources
- Introduction
- Download & Documentation
- Chapter 0 - Getting Started | ZigLearn.org
- Community
- Contributing
- Code of Conduct
- Frequently Asked Questions
- Community Projects
Installation
- download a pre-built binary
- install from a package manager
- build from source
- bootstrap zig for any target
License
The ultimate goal of the Zig project is to serve users. As a first-order effect, this means users of the compiler, helping programmers to write better software. Even more important, however, are the end-users.
Zig is intended to be used to help end-users accomplish their goals. Zig should be used to empower end-users, never to exploit them financially, or to limit their freedom to interact with hardware or software in any way.
However, such problems are best solved with social norms, not with software licenses. Any attempt to complicate the software license of Zig would risk compromising the value Zig provides.
Therefore, Zig is available under the MIT (Expat) License, and comes with a humble request: use it to make software better serve the needs of end-users.
This project redistributes code from other projects, some of which have other licenses besides MIT. Such licenses are generally similar to the MIT license for practical purposes. See the subdirectories and files inside lib/ for more details.