linux-hardened
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linux-hardened | usbguard | |
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16 | 22 | |
538 | 1,073 | |
- | 2.7% | |
0.0 | 2.9 | |
10 days ago | 6 months ago | |
C | C++ | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 only |
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linux-hardened
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Question about immutability
Glossing over their hardening guide, we notice that the kernel-hardened package is mentioned. This is a fork of what once was the kernel of GrapheneOS. While this hardened kernel can be used on a variety of distros, unfortunately this doesn't apply to Fedora Silverblue. Furthermore, I haven't seen any mention of the hardened kernel being used on openSUSE Tumbleweed. Therefore I see no reason to believe that this is possible on openSUSE Aeon either. Though, I'd love to be corrected on this!
- How to obtain hardened kernel?
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Is there a security focused Linux distro for desktop users?
Here's the GitHub page for the linux-hardened package in the official Arch repos. You will find that lots of changes come from GrapheneOS. "Forked from GrapheneOS" is in tiny, tiny text near the top-left of the web page underneath the project name.
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Let's Play with the Linux Kernel
Here is the source code for the hardened Linux kernel.
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Deploying Firecracker VMs
so that we can use it liberally in CLI) > **Additionally, here's a 'building from the source section** - https://github.com/firecracker-microvm/firecracker/blob/main/docs/getting-started.md#building-from-source ### Running Firecracker > "*In production, Firecracker is designed to be run securely, inside an execution jail, carefully set up by the jailer binary. This is how our integration test suite does it. However, if you just want to see Firecracker booting up a guest Linux machine, you can do that as well.*" 1. We need to first obtain an "uncompressed Linux kernel binary, and an ext4 file system image (to use as rootfs)" ; great, these are two things that we need to seek out before we move forward in our 'adventure' (*this really feels like a "quest" of some sort, like the ones that they forced you to play on Runescape back in the days*) **How to Decompress Linux Kernel** (explicit instructions to be honest here) - https://0xax.gitbooks.io/linux-insides/content/Booting/linux-bootstrap-5.html **Linux-Hardened Kernel** - https://github.com/anthraxx/linux-hardened (this is something that they're all still actively working on at this very point in time) They also say that we need an 'ext4 file system image' (where do we obtain this from?) - found it **Full Guide on How to Create an EXT4 filesystem image here** -https://fabianlee.org/2020/01/13/linux-mounting-a-loopback-ext4-xfs-filesystem-to-isolate-or-enforce-storage-limits/ Assuming that the above has been handled, the directions insist that we create two separate shell prompts, (one to run Firecracker, and another one to control it [by writing to the API socket]; both shells have to run "in the same directory where the firecracker binary was placed") ^^ What? - This is a pain in the ass because this is something that they should've mentioned earlier (obv. everyone is going to move a binary where the rest of their binaries go ; and you're not going to just load up some random project to be used in that manner) - Not even sure what the end goal of opening up an API socket here would really be But fuck it, let's just assume that we play ball and we adhere to all of these (additional) steps that we're being put through (just for the setup up this virtualization tool!). ### Following Through on the Next Steps 1. Ensuring that Firecracker can create its own API ``` bash rm -f /tmp/firecracker.socket
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The flashing screen bug seems to be fixed with the 5.19.13 kernel
Officially supported kernels Community support on forum and bug reporting is available for officially supported kernels. Stable — Vanilla Linux kernel and modules, with a few patches applied. https://www.kernel.org/ || linux Hardened — A security-focused Linux kernel applying a set of hardening patches to mitigate kernel and userspace exploits. It also enables more upstream kernel hardening features than linux. https://github.com/anthraxx/linux-hardened || linux-hardened Longterm — Long-term support (LTS) Linux kernel and modules. https://www.kernel.org/ || linux-lts Zen Kernel — Result of a collaborative effort of kernel hackers to provide the best Linux kernel possible for everyday systems. Some more details can be found on https://liquorix.net (which provides kernel binaries based on Zen for Debian). https://github.com/zen-kernel/zen-kernel || linux-zen
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Kernels: xanmod vs tkg vs lqx vs zen vs hardened
Overall those patches do protect you in a lot of cases. Per default upstream features are chose to honor security first. Furthermore patches do frequently protect against upstream failures and vulnerabilities. One of the latest examples is CVE-2022-1729 https://seclists.org/oss-sec/2022/q2/122 a local privilege vulnerability that linux-hardened simply protects since before day 0: https://github.com/anthraxx/linux-hardened/commit/4dd6bdf3b079ef73e597661ee961d225bfccbe2a On top the approach in several places of fail-early instead of potentially continuing with known corruption or certain use-after-free regularly uncovers problems that get fixed upstream and where the vanilla kernels just keep on running, which include exploitable problems. One example of a faulty very recent commit that has been bisected and fixed because of linux-hardened: https://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev.git/commit/?h=for-next&id=acde4003efc16480375543638484d8f13f2e99a3
- When and why did linux-hardened move to lts branch?
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windows kernel patch guard-like for linux ?
Those two don't protect the kernel itself from "misuse". To do that, there are ways like kernel hardening 3, using hardened kernel 4 5.
- Is Arch dangerously out of date?
usbguard
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Security of wireless keyboards
You want USBGuard. Its probably available in your distro repository. Its a very neat piece of software!
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USBGuard
If I were an attacker, could I clone the device id and attributes of the victim's previously approved devices? https://github.com/USBGuard/usbguard#before-the-first-start
Anyway I enjoy this HID stuff, I've been playing with using a computer as a keyboard to another computer. With scroll, num, and capslock LED's, bidirectional communication can be achieved and by injecting a small process I think some new kind of universal REPL can be accomplished.
- How to obtain hardened kernel?
- MS Poweruser claim: Windows 10 has fewer vulnerabilities than Linux (the kernel). How was this conclusion reached though?
- USBGuard: USB Device Whitelisting and Blacklisting
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USBGuard vs USB?
Few days ago I found this: https://usbguard.github.io/ but during read some information how-to, I found comments similar to this: "A USB device can identify itself basically however it wants ". What's your opinion? USBGuard could be a tool, that nice to have or could be useless for some reason?
- Self hosted USB management software
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Blacklisting all usb devices, until manually authenticated
Hello lynet_101 I think that UsbGuard is what you are looking for: https://usbguard.github.io/
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The Google plasma globe affair of 2012
For those wondering, there is an easy defense against this on Linux, USBGuard (https://usbguard.github.io/)
RHEL7+ include USBGuard as part of the standard repo [0]
[0] https://access.redhat.com/documentation/en-us/red_hat_enterp...
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Prevent badusb attack?
Isn't UsbGuard designed to prevent exactly just that?
What are some alternatives?
zen-kernel - Zen Patched Kernel Sources
UsbDk - Usb Drivers Development Kit for Windows
vaultwarden - Unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs
LsUSB - Collect lsusb reports and find most popular USB devices
checksec.sh - Checksec.sh
msigd - MSI Gaming Device control application
hardened-kernel - Hardened kernel configuration optimized for virtual machines. - https://www.kicksecure.com/wiki/Hardened-kernel
usbguard-notifier - A tool for detecting usbguard policy and device presence changes
steam-for-linux - Issue tracking for the Steam for Linux beta client
xow - Linux driver for the Xbox One wireless dongle
kernel-hardening-checker - A tool for checking the security hardening options of the Linux kernel
duckhunt - :dart: Prevent RubberDucky (or other keystroke injection) attacks