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  • Prevent Overlayfs Privilege Escalation on Ubuntu Kernels with Yaml (bpf)!

    calendar 02 Aug 2023, 00:00 · 3 min read · opensource linux kernel bpf security tetragon  ·
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    Prevent Overlayfs Privilege Escalation on Ubuntu Kernels with Yaml (bpf)!

    Past week Wiz blogged about Overlayfs bugs that can be abused on Ubuntu Kernels to perform privilege escalation, named GameOver(lay) read more here. Those are CVE-2023-2640 and CVE-2023-32629, also Datadog has another writeup about a previous Overlayfs upstream vulnerability CVE-2023-0386. Background All these are …


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  • Kernel Image Lockdown and eBPF Flexibility!

    calendar 11 Feb 2022, 00:00 · 6 min read · opensource linux kernel bpf security  ·
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    Kernel Image Lockdown and eBPF Flexibility!

    The Kernel Lockdown feature that was merged in Linux 5.4 is designed to prevent both direct and indirect access to a running kernel image, attempting to protect against unauthorized modification of the kernel image and to prevent access to security and cryptographic data located in kernel memory, whilst still …


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  • eBPF: Block Linux Fileless Payload "Malware" Execution with BPF LSM

    calendar 06 Feb 2022, 00:00 · 6 min read · opensource linux kernel bpf security IoT  ·
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    eBPF: Block Linux Fileless Payload "Malware" Execution with BPF LSM

    Due to the security features that Linux offers, like booting directly into a readonly filesystem, making filesystems readonly at runtime for apps and containers, some attacks have been using what is known as "fileless binary execution" to avoid such protections, and gain the ability to execute binaries …


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  • eBPF Summit 2021 - Talk: BPF to bridge Cloud and IoT Linux Security

    calendar 04 Jan 2022, 00:00 · 1 min read · opensource linux kernel bpf security IoT  ·
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    eBPF Summit 2021 - Talk: BPF to bridge Cloud and IoT Linux Security

    At the eBPF Summit 2021, I gave a talk about how to take advantage of eBPF to try to bridge some cloud and IoT security features. My Talk can be found here: BPF to bridge Cloud and IoT Linux Security on youtube All eBPF Summit 2021 here: eBPF Summit 2021 Youtube Channel


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  • DZ Open Source contributions into space Mars 2020 Helicopter, Ingenuity

    calendar 19 Apr 2021, 00:00 · 1 min read · opensource linux kernel mars space algeria  ·
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    DZ Open Source contributions into space Mars 2020 Helicopter, Ingenuity
    Some friends pinged me about a GitHub post that lists Open Source projects used into space, more precisely within the Mars ingenuity mission. The Github post is here: Open source goes to Mars
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  • All systems go Conference - Modern deployment for Embedded Linux and IoT Talk

    calendar 02 Dec 2017, 00:00 · 1 min read · opensource linux kernel IoT security conference systemd  ·
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    All systems go Conference - Modern deployment for Embedded Linux and IoT Talk

    The Userspace Linux Conference All Systems Go! 2017 videos and talks are now available online. My talk "Modern Deployment for Embedded Linux and IoT" is available here: Video - Slides All video talks are here


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  • Modernization of Linux proc filesystem and containers security

    calendar 30 Nov 2017, 00:00 · 2 min read · opensource linux kernel containers security  ·
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    Modernization of Linux proc filesystem and containers security

    TL;DR: The Linux kernel procfs suffers from a historical design that prevents having multiple separate procfs instances inside the same PID namespace. All the mounts are a mirror of the internal one. This blocks developement of Linux containers, sandboxes, and other security related features. Patch solution: PATCH RFC …


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  • Linux kernel improve Module autoloading infrastructure

    calendar 28 Nov 2017, 00:00 · 1 min read · opensource linux kernel security  ·
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    Linux kernel improve Module autoloading infrastructure

    TL;DR: Currently, an explicit call to load or unload kernel modules require CAP_SYS_MODULE capability. However unprivileged users have always been able to load some modules using the implicit auto-load operation. An automatic module loading happens when programs request a kernel feature from a module that is not …


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  • Hardening Linux-based IoT systems

    calendar 16 Oct 2017, 00:00 · 4 min read · opensource linux kernel IoT security  ·
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    Hardening Linux-based IoT systems
    TL;DR: In Linux kernel and as part of the Kernel Self Protection Project we are pushing for new lightweight security mechanisms. On top of that, in systemd we are implementing new lightweight container mechanisms that target Embedded Linux and IoT. Our goal is to make it easy to deploy Secure Embedded Linux and IoT …
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  • systemd Sandbox or systemd Lightweight Containers

    calendar 15 Oct 2017, 00:00 · 4 min read · opensource linux systemd containers security  ·
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    systemd Sandbox or systemd Lightweight Containers

    Sandboxing IoT Apps using lightweight containers is an important step for Linux-IoT based devices, it allows to reduce the exposure from mis-configuration, bugs, or vulnerability exploitation. As a simple example the BrickerBot and similar worms did not use complex 0day exploits. They used simple attack vectors like …


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Djalal Harouni

Open Source Software Hacker / Cloud / Linux kernel / BPF / systemd from DZ.
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Featured Posts

  • Prevent Overlayfs Privilege Escalation on Ubuntu Kernels with Yaml (bpf)!
  • Kernel Image Lockdown and eBPF Flexibility!
  • eBPF: Block Linux Fileless Payload "Malware" Execution with BPF LSM
  • eBPF Summit 2021 - Talk: BPF to bridge Cloud and IoT Linux Security
  • DZ Open Source contributions into space Mars 2020 Helicopter, Ingenuity
  • Modernization of Linux proc filesystem and containers security
  • Linux kernel improve Module autoloading infrastructure
  • Hardening Linux-based IoT systems

Recent Posts

  • All systems go Conference - Modern deployment for Embedded Linux and IoT Talk
  • Hardening Linux-based IoT systems

Categories

LINUX 11 OPENSOURCE 10 TECHNOLOGY 7 BPF 4 SECURITY 4 TETRAGON 1

Tags

LINUX 11 OPENSOURCE 11 KERNEL 10 SECURITY 10 BPF 4 IOT 4 CONTAINERS 2 SYSTEMD 2 ALGERIA 1 CONFERENCE 1 MARS 1 SPACE 1 TETRAGON 1
Djalal Harouni

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