This article details the insertion of a common test points into the JavaScript IR/LIR instruction emulator within the JavaScript engine called Spidermonkey.

Identification of Insertion

Since the current JS debugger has left plenty of impressions throughout the SpiderMonkey code, we searched for the print() aspect of the debugger that …

Jul 04 2022 JavaScript Interpreter Analysis, Mozilla Unified

This article details the analysis of available datum associated with each bytecode of the JavaScript interpreter in Mozilla Unified repo (that is also being used in Firefox).

Datum

The focus of the bytecode interpreter is the loop (INTERPRETER_LOOP() C macro).

Available structures are given in Interpreter() function:

Run State machine …

Jul 04 2022 Debugging `jsshell`

This article details how to perfom debugging of the jsshell in Mozilla Unified repository.

Setting Up `jsshell` Debug

With the js binary built (as described in Firefox JSSHELL, we can then start debugging.

Preparing Work Directory

cd firefox
          mkdir test
          cd test
          DISTDIR=../repo/mozilla-unified/obj-debug-x86_64-pc-linux-gnu/dist/bin/js
          ln …

Jun 27 2022 Mozilla Environment Variables, getting

Everything you need to know about environment variables in the Mozilla Unified repository. Mozilla Unified covers the following applications/products:

Firefox
Thunderbird

References

https://firefox-source-docs.mozilla.org/security/nss/legacy/reference/nss_environment_variables/index.html

Environment Variables

Environment variables are broken up into getting and setting the environment variables.

Setting Environment …

Jun 26 2022 Mozilla Environment Variables, setting

Environment variables that got created (via setenv()) in Mozilla Unified repository, git HEAD branch:

environment variable name	description	source file
`__GL_ALLOW_FXAA_USAGE`	Set to `0` to temporarily disable the FXAA antialiasing on NVidia drivers. Bug 1714483.	build/mach_initialize.py
`ANDROID_EMU_VK_NO_CLEANUP`	This envvar gets created in implementing commands for running and interacting …

Jun 24 2022 Wiping Device Drives Securely

Hidden Partition

Things to do when re-using a hard drive of unknown source (Craig’s List, in my example).

Self-Encrypting Drive (SED)
ATA Security
- Unlock the hard drive
- Check for hidden partition
- - Host Protected Area
- - DCO - Device Configuration Overlay
Wipe the hard drive

Self-Encrypting Drive (SED)

Self-encrypting drive have firmware …

Jun 23 2022 Environment Variables for Mozilla Mach

Main

`USERNAME`	uriloader/exthandler/nsExternalHelperAppServer.cpp
`USER`	uriloader/exthandler/nsExternalHelperAppServer.cpp
`LOGNAME`	uriloader/exthandler/nsExternalHelperAppServer.cpp
`PATH`	uriloader/exthandler/unix/nsOSHelperAppServer.cpp, modules/freetype2/builds/unix/ltmain.sh
`MOZ_DEFAULT_PREFS`	modules/libpref/Preferences.cpp
`MOZ_ANDROID_CPU_ABI`	modules/libpref/Preferences.cpp
`COMSPEC`	modules/freetype2/builds/unix/ltmain.sh
`JARLOG_FILE`	build/pgo/profileserver.py …

Jun 23 2022 Mozilla Mach Build Options

MOZ_OBJDIR is where your object files get built in.

References

https://firefox-source-docs.mozilla.org/setup/configuring_build_options.html

Jun 23 2022 Firefox Development

For a buildable JS instrumentation, read in following order

May 03 2022 Authorization Methods for OpenSSH

The many ways to authorized a user in OpenSSH

Apr 30 2022 Bind9 v9.3.1 Internals

Internals of Bind9 is not found easily, much less created but

Apr 16 2022 Exim4 is Dead-On-Arrival

Wait, Uh? Exim4 can do What?

A nice blurb on the Encrypted SMTP connections using TLS/SSL on Exim4 website:

For TLS version 1.3 the control available is less fine-grained and Exim does not provide access to it at present. The value of the tls_require_ciphers option is ignored when …

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