Entering in Podman containers
Published:
Some commands for interacting with the namespaces of Podman containers.
TUN/TAP interface (on Linux)
Published:
Some notes about using the TUN/TAP interface, especially on Linux.
Disable certificate verification on Android with Frida
Published:
Some notes about how to write a Frida script with the (somewhat classic) example of disabling certificate verification for TLS communications on Android applications.
GNU/Linux host name resolution
Published:
This post describes different software components involved in host name resolutions and DNS configuration on GNU/Linux systems. It consists of a diagram and some accompanying explanations. The goal is to give some pointers and references to understand how to troubleshoot host name/DNS resolution problems and configuration problems on GNU/Linux systems.
OpenSSH ProxyUseFdPass
Published:
While looking at the OpenSSH ssh_config manpage, I found the ProxyUseFdpass configuration I did not know about. It is apparently not widely known or used.
The ELF file format
Published:
Some notes on the ELF 🧝 file format with references, explanations and some examples.
SimGridMC: The Big Split (and Cleanup)
Published:
In my previous SimGrid post, I talked about different solutions for a better isolation between the model-checked application and the model-checker. We chose to avoid the (hackery) solution based multiple dynamic-linker namespaces in the same process and use a more conventional process-based isolation.
Anatomy of an ELF core file
Published:
The Executable and Linkable Format (ELF) 🧝 is used for compilation outputs (.o files), executables, shared libraries and core dumps. The first cases are documented in the System V ABI specification and the Tools Interface Standard (TIS) ELF specification but there does not seem to be much documentation about the usage of the ELF format for core dumps. Here are some notes on this.
Logging message workflow with journald
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A short summary of the logging message workflow with systemd-journald (and the different formats and sockets involved).
ELF loading and dynamic linking
Published:
Some notes on ELF 🧝 loading and dynamic linking mainly for GNU userland (ld.so, libc, libdl) running on top of the Linux kernel. Some prior knowlegde on the topic (virtual memory, shared objects, sections) might be useful to understand this.
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