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Welcome to salt, a tool to reverse and learn kernel heap memory management. It can be useful to develop an exploit, to debug your own kernel code, and, more importantly, to play with the kernel heap allocations and learn its inner workings.

This tool helps tracing allocations and the current state of the SLUB allocator in modern linux kernels.

It is written as a gdb plugin, and it allows you to trace and record memory allocations and to filter them by process name or by cache. The tool can also dump the list of active caches and print relevant information.

This repository also includes a playground loadable kernel module that can trigger allocations and deallocations at will, to serve both as a debugging tool and as a learning tool to better understand how the allocator works.

More information about the inner workings of the SLUB allocator, how to get started, the detailed documentation of the plugin, and notes on the playground module can be found in the docs folder.

Here is the full list of commands:

> salt help
Possible commands:

filter -- manage filtering features by adding with one of the following arguments
       enable -- enable filtering. Only information about filtered processes will be displayed
       disable -- disable filtering. Information about all processes will be displayed.
       status -- display current filtering parameters
       add process/cache <arg>-- add one or more filtering conditions
       remove process/cache <arg>-- remove one or more filtering conditions
       set -- specify complex filtering rules. The supported syntax is "salt filter set (cache1 or cache2) and (process1 or process2)".
       Some variations might be accepted. Checking with "salt filter status" is recommended. For simpler rules use "salt filter add".


record -- manage recording features by adding with one of the following arguments
       on -- enable recording. Information about filtered processes will be added to the history
       off -- disable recording.
       show -- display the recorded history
       clear -- delete the recorded history

trace <proc name> -- reset all filters and configure filtering for a specific process

walk -- navigate all active caches and print relevant information

walk_html -- navigate all active caches and generate relevant information in html format

walk_json -- navigate all active caches and generate relevant information in json format

help -- display this message

And here you can see salt in action:

screenshot

This project was developed at EURECOM as a semester project for Spring 2018.
Many thanks to my supervisors Yanick, Fabio, Emanuele, Dario, Marius, and to the rest of the S3 team that helped and followed me.

Presentation

As part of my project, I also gave a presentation to the security team of EURECOM. The slides are available here.

Additional Resources

Perla E, Oldani M (2010) - A Guide to Kernel Exploitation: Attacking the Core

Christopher Lameter - Slab allocators in the linux kernel

th7.cn

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