The new limitation is controlled by the LMAX_REGEXP_MEMORY_MAX config option. The size of the regexp representation is limited to 8 MB by default. To raise the limit, set the LMAX_REGEXP_MEMORY_HEIGHT config option. To lower it, set the LMAX_REGEXP_MEMORY_DEPTH config option. After these changes, the maximum size of the regexp representation is 16 MB.

Configuring LMAX Disruption Protection

Configuring LMAX Disruption Protection is often a challenge. Luckily, the library provides several options that make it easy to configure. The following changes can be made:

LMAX_REGEXP_MEMORY_MAX (Default: 8 MB) - Set this to increase the maximum size of the regexp representation stored in memory.
LMAX_REGEXP_MEMORY_DEPTH (Default: 4 MB) - This sets the number of levels of recursion allowed in a regexp pattern.
LMAX_REGEXP_MEMORY_HEIGHT (Default: 1 MB) - This sets the size of heap for associative arrays that are used by regexps.

How to check if your system is affected by CVE-2022-41715?

To check if your system is affected by CVE-2022-41715, you can use one of these tools:
1. A tool that has been released by the vendor
2. A tool that has been created by the community
3. An online service
4. The Wireshark network dissector

What’s a Regexp?

A regular expression, or regexp for short, is a pattern that describes a sequence of characters. It’s used in text processing to find and replace matches. A regexp is written as "(?

Changing the limit of thread pool threads

By default, there are 16 threads in the thread pool. The new limitation is controlled by the LMAX_REGEXP_MEMORY_MAX config option. The size of the regexp representation is limited to 8 MB by default. To raise the limit, set the LMAX_REGEXP_MEMORY_HEIGHT config option. To lower it, set the LMAX_REGEXP_MEMORY_DEPTH config option.
When changing these values, be careful not to make your maximum number of threads too large or too small. These are integer values and must be kept within a range of numbers that makes sense for your application's execution needs. Changing these values also changes how many incoming requests can be handled at one time because these settings affect both threads and requests in queue.

LMAX Disruptor

The LMAX Disruptor is a light-weight, high-performance library for the Java and Scala programming languages. The library provides support for functional, imperative and object-oriented programming styles. It aims to provide an expressive interface that enables developers to write code with minimal friction, enabling them to focus on their business logic rather than low-level implementation details.
We want LMAX Disruptor to be as easy as possible to use in your language of choice: we have introduced a new feature called Reactive Streams which supports seamless interoperability with other reactive libraries such as RxJava 2 and Akka Streams. This means that you can now use one of these other libraries without any changes whatsoever in order to take advantage of the power of reactive streams in Scala.
We have also made it easier than ever before to bring reactive streams into your existing application. Using the reactive streams API is just like using standard java/scala collections, so you can easily integrate LMAX Disruptor into your existing application without having to change any code at all!

Timeline

Published on: 10/14/2022 15:16:00 UTC
Last modified on: 10/18/2022 19:41:00 UTC

References