There are several kernel hardening features that have appeared in other hardened operating systems that would improve the security of Ubuntu, and Linux in general. They have been controversial, so this page attempts to describe them, including their controversy and discussion over the years, so as much information is available to make an educated decision about potential implementations. Variation

Summary The original motivation for Yaffs 2 was to add support for the new NAND with 2kB pages instead of 512-byte pages and strictly sequential page writing order. To achieve this, a new design is used which also realises the following benefits: Zero page rewrites means faster operation. (Yaffs1 uses a single rewrite in the spare area to delete a page). Ability to exploit simultaneous page progra

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Full Disclosure mailing list archives By Date   By Thread   Ac1db1tch3z vs x86_64 Linux Kernel From: ac1db1tch3z () gmail com Date: Wed, 15 Sep 2010 22:08:23 -0700 (PDT) /* Ac1dB1tch3z Vs Linux Kernel x86_64 0day Today is a sad day.. R.I.P. Tue, 29 Apr 2008 / Tue, 7 Sep 2010 a bit of history: MCAST_MSFILTER Compat mode bug found... upon commit! (2 year life on this one) author David L Stevens <

compat: Make compat_alloc_user_space() incorporate the access_ok() compat_alloc_user_space() expects the caller to independently call access_ok() to verify the returned area. A missing call could introduce problems on some architectures. This patch incorporates the access_ok() check into compat_alloc_user_space() and also adds a sanity check on the length. The existing compat_alloc_user_space() im

従来のLinuxはread(2)やwrite(2)によるメモリアクセスは二回タッチでactiveリストへ移動だったのに、 mmapによるタッチは(pteのaccess bitが1bitしかない関係で）１回タッチでactiveリストになっていた。 そのため、現代的なマシンではmmapを使ってコピーすると逆に遅いという自体が発生していた。 以下のURL参照 http://d.hatena.ne.jp/kzk/20060513 んで、１年ぐらい前にmadviseしたときだけ、page activationを控えめにするパッチが入っていたのだが 今回2.6.34において、madviseなしでもused onceページはactiveリストに移動しないように論理が変更された。 と、定性的に説明するのも芸がないので、ベンチをとってみた。 測定ソフト --------------------------

Since version 0.3.59, PipeWire supports LE Audio’s Basic Audio Profile (BAP) for Connected Isochronous Streams (CIS) with the Low Complexity Communication Codec (LC3), see https://www.linkedin.com/posts/collabora_add-bluetooth-le-audio-support-1360-activity-6978014601649037312-7W6d/. Thanks to the modular architecture of PipeWire, it is ready for future codecs. It supports bi-directional audio and

Linuxカーネルは、ブロックI/Oの処理効率を向上させるさせるための仕組みとして、I/Oスケジューラと呼ばれる機能を提供しています。I/OスケジューラはI/O要求の順序を入れ替えることにより、スループットを向上させたり、特定のI/O要求を優先して実行させたりします。 実際のブロックデバイスのセクタに対するアクセス（つまり読み書き）を、要求された順序ではなく、I/Oを最も効率よく行うためにその順序を並び替えるというアイデアは、初期のUNIXの実装から採用されていました。それは、セクタ番号順序に並び替えてI/Oを実行するという単純なものです。ディスク面上を移動するヘッドの動きがエレベータに似ているため、このアルゴリズムはエレベータアルゴリズムなどと呼ばれていました。 現在のLinuxカーネルでは、そのころのアルゴリズムより洗練されたスケジューリング方式を採用しており、目的に応じて4種類の

The iputils package is set of small useful utilities for Linux networking. It was originally maintained by Alexey Kuznetsov. Maintainer YOSHIFUJI Hideaki / USAGI/WIDE Project Mailing List netdev@vger.kernel.org Source Code Repository USAGI Project git://git.linux-ipv6.org/gitroot/iputils.git http://www.linux-ipv6.org/gitweb/gitweb.cgi?p=gitroot/iputils.git Sourceforge git://git.code.sf.net/p/iputi

2010年05月14日 Linuxカーネルのビルドで特定のファイルのコンパイル最適化オプションを変更する Linuxカーネルをデバッガで追っていくときに、コンパイラの最適化のためにアドレスとソースの対応づけや変数のメモリ割り当ての情報が失われてしまっていたり、インライン展開されてしまっていたりして、意図したようにデバッガが動かないことがあります。 こんなときはコンパイラの最適化を抑止する-O0(大文字のオーの後に数字のゼロ)のコンパイルオプションをつければよいのですが、全てのソースを-O0でコンパイルすると動かなくなってしまうこともあります。 そこで、特定のファイルだけのコンパイルオプションを追加する方法を紹介します。 ソースファイルのあるMakefikeに以下のような行を追加します。 CFLAGS_(オブジェクトファイル名) = コンパイルオプション 例えば、init/main.c だけ

Yaffs (Yet Another Flash File System) is an open-source file system specifically designed to be fast, robust and suitable for embedded use with NAND and NOR Flash. It is widely used with Linux, RTOSs, or no OS at all, in consumer devices, avionics, and critical infrastructure. It is available under GNU Public License, GPL, or on commercial terms from Aleph One. Yaffs in space! The NASA Transiting

2014-05-09 - New release: 4.2.1 A new minor version that incorporates a few patches that came through the Debian Bug Tracking System and were not included in 4.2. 2014-04-15 - New release: 4.2 A new major version, prepared by Nicolas Fran�ois during summer 2013, but only release in April 2014 by Christian Perrier. Bring subuid/subgid support. 2011-02-15 - New release: 4.1.4.3 A new minor version w

Presentation The Linux Wireless Extension and the Wireless Tools are an Open Source project sponsored by Hewlett Packard (through my contribution) since 1996, and build with the contribution of many Linux users all over the world. The Wireless Extension (WE) is a generic API allowing a driver to expose to the user space configuration and statistics specific to common Wireless LANs. The beauty of i

General About Hotplugging Links User Mode Software Overview Setting Up Debugging License (GPL) Subsystem Support CONFIG_HOTPLUG Docking Stations IBM Channel Devices IEEE 1394 Input Networking PCI SCSI USB SourceForge Services Downloads Project Page Starting with kernel 2.4 (in January 2001), hotplugging became a standard feature of GNU/Linux. It's been backported to kernel 2.2 (for USB), and kerne

What is linux-gate.so.1?When you use the ldd utility on a reasonably recent Linux system you'll frequently see a reference to an ethereal entity known as linux-gate.so.1: ldd /bin/sh linux-gate.so.1 => (0xffffe000) libdl.so.2 => /lib/libdl.so.2 (0xb7fb2000) libc.so.6 => /lib/libc.so.6 (0xb7e7c000) /lib/ld-linux.so.2 (0xb7fba000) What's so strange about that? It's just a dynamically loaded li

The rt2x00 driver website has been decommissioned. The rt2x00 wireless driver website is no longer available. All future discussions around this driver should be moved to the linux-wireless mailing list An archive of our old mailing list can be found here An archive of our old forum can be found here An archive of our old wiki can be found here Any queries, feel free to contact the old website adm

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