Avoid syscall


ID: ruby-security/avoid-syscall

Language: Ruby

Severity: Info

Category: Security


The syscall function is a direct interface to the operating system’s system calls. This rule is important because using syscall can lead to non-portable and difficult to maintain code. Different operating systems have different system calls and different numbers assigned to them. Therefore, the code that uses syscall may behave differently on different systems, which can lead to unexpected results and bugs that are hard to track down.

Furthermore, syscall is considered to be a low-level interface, which should be avoided in high-level programming languages like Ruby. It bypasses the abstractions that Ruby provides, which can lead to less readable and more error-prone code.

Instead of using syscall, use the abstractions that Ruby provides. For example, if you want to write to a file, use Ruby’s File class, which provides a high-level, portable interface for file operations. This way, you can ensure that your code is portable and easier to maintain. For instance, you can replace the syscall function in the non-compliant code with File.write('filename', 'hello\n').

Non-Compliant Code Examples

# See https://ruby-doc.org/core-2.4.1/Kernel.html
syscall 4, 1, "hello\n", 6   # '4' is write(2) on our box
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