SUSE Linux Enterprise Server 15 SP2 Autoyast Guide Autoyast Guide SUSE Linux Enterprise Server 15 SP2
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FIPS 140-2 Non-Proprietary Security Policy
Kernel Crypto API Cryptographic Module version 1.0 FIPS 140-2 Non-Proprietary Security Policy Version 1.3 Last update: 2020-03-02 Prepared by: atsec information security corporation 9130 Jollyville Road, Suite 260 Austin, TX 78759 www.atsec.com © 2020 Canonical Ltd. / atsec information security This document can be reproduced and distributed only whole and intact, including this copyright notice. Kernel Crypto API Cryptographic Module FIPS 140-2 Non-Proprietary Security Policy Table of Contents 1. Cryptographic Module Specification ..................................................................................................... 5 1.1. Module Overview ..................................................................................................................................... 5 1.2. Modes of Operation ................................................................................................................................. 9 2. Cryptographic Module Ports and Interfaces ........................................................................................ 10 3. Roles, Services and Authentication ..................................................................................................... 11 3.1. Roles .......................................................................................................................................................11 3.2. Services ...................................................................................................................................................11 -
Oracle® Linux Administrator's Solutions Guide for Release 6
Oracle® Linux Administrator's Solutions Guide for Release 6 E37355-64 August 2017 Oracle Legal Notices Copyright © 2012, 2017, Oracle and/or its affiliates. All rights reserved. This software and related documentation are provided under a license agreement containing restrictions on use and disclosure and are protected by intellectual property laws. Except as expressly permitted in your license agreement or allowed by law, you may not use, copy, reproduce, translate, broadcast, modify, license, transmit, distribute, exhibit, perform, publish, or display any part, in any form, or by any means. Reverse engineering, disassembly, or decompilation of this software, unless required by law for interoperability, is prohibited. The information contained herein is subject to change without notice and is not warranted to be error-free. If you find any errors, please report them to us in writing. If this is software or related documentation that is delivered to the U.S. Government or anyone licensing it on behalf of the U.S. Government, then the following notice is applicable: U.S. GOVERNMENT END USERS: Oracle programs, including any operating system, integrated software, any programs installed on the hardware, and/or documentation, delivered to U.S. Government end users are "commercial computer software" pursuant to the applicable Federal Acquisition Regulation and agency-specific supplemental regulations. As such, use, duplication, disclosure, modification, and adaptation of the programs, including any operating system, integrated software, any programs installed on the hardware, and/or documentation, shall be subject to license terms and license restrictions applicable to the programs. No other rights are granted to the U.S. -
Chapter 3. Booting Operating Systems
Chapter 3. Booting Operating Systems Abstract: Chapter 3 provides a complete coverage on operating systems booting. It explains the booting principle and the booting sequence of various kinds of bootable devices. These include booting from floppy disk, hard disk, CDROM and USB drives. Instead of writing a customized booter to boot up only MTX, it shows how to develop booter programs to boot up real operating systems, such as Linux, from a variety of bootable devices. In particular, it shows how to boot up generic Linux bzImage kernels with initial ramdisk support. It is shown that the hard disk and CDROM booters developed in this book are comparable to GRUB and isolinux in performance. In addition, it demonstrates the booter programs by sample systems. 3.1. Booting Booting, which is short for bootstrap, refers to the process of loading an operating system image into computer memory and starting up the operating system. As such, it is the first step to run an operating system. Despite its importance and widespread interests among computer users, the subject of booting is rarely discussed in operating system books. Information on booting are usually scattered and, in most cases, incomplete. A systematic treatment of the booting process has been lacking. The purpose of this chapter is to try to fill this void. In this chapter, we shall discuss the booting principle and show how to write booter programs to boot up real operating systems. As one might expect, the booting process is highly machine dependent. To be more specific, we shall only consider the booting process of Intel x86 based PCs. -
The Xen Port of Kexec / Kdump a Short Introduction and Status Report
The Xen Port of Kexec / Kdump A short introduction and status report Magnus Damm Simon Horman VA Linux Systems Japan K.K. www.valinux.co.jp/en/ Xen Summit, September 2006 Magnus Damm ([email protected]) Kexec / Kdump Xen Summit, September 2006 1 / 17 Outline Introduction to Kexec What is Kexec? Kexec Examples Kexec Overview Introduction to Kdump What is Kdump? Kdump Kernels The Crash Utility Xen Porting Effort Kexec under Xen Kdump under Xen The Dumpread Tool Partial Dumps Current Status Magnus Damm ([email protected]) Kexec / Kdump Xen Summit, September 2006 2 / 17 Introduction to Kexec Outline Introduction to Kexec What is Kexec? Kexec Examples Kexec Overview Introduction to Kdump What is Kdump? Kdump Kernels The Crash Utility Xen Porting Effort Kexec under Xen Kdump under Xen The Dumpread Tool Partial Dumps Current Status Magnus Damm ([email protected]) Kexec / Kdump Xen Summit, September 2006 3 / 17 Kexec allows you to reboot from Linux into any kernel. as long as the new kernel doesn’t depend on the BIOS for setup. Introduction to Kexec What is Kexec? What is Kexec? “kexec is a system call that implements the ability to shutdown your current kernel, and to start another kernel. It is like a reboot but it is indepedent of the system firmware...” Configuration help text in Linux-2.6.17 Magnus Damm ([email protected]) Kexec / Kdump Xen Summit, September 2006 4 / 17 . as long as the new kernel doesn’t depend on the BIOS for setup. Introduction to Kexec What is Kexec? What is Kexec? “kexec is a system call that implements the ability to shutdown your current kernel, and to start another kernel. -
Linux Boot Loaders Compared
Linux Boot Loaders Compared L.C. Benschop May 29, 2003 Copyright c 2002, 2003, L.C. Benschop, Eindhoven, The Netherlands. Per- mission is granted to make verbatim copies of this document. This is version 1.1 which has some minor corrections. Contents 1 introduction 2 2 How Boot Loaders Work 3 2.1 What BIOS does for us . 3 2.2 Parts of a boot loader . 6 2.2.1 boot sector program . 6 2.2.2 second stage of boot loader . 7 2.2.3 Boot loader installer . 8 2.3 Loading the operating system . 8 2.3.1 Loading the Linux kernel . 8 2.3.2 Chain loading . 10 2.4 Configuring the boot loader . 10 3 Example Installations 11 3.1 Example root file system and kernel . 11 3.2 Linux Boot Sector . 11 3.3 LILO . 14 3.4 GNU GRUB . 15 3.5 SYSLINUX . 18 3.6 LOADLIN . 19 3.7 Where Can Boot Loaders Live . 21 1 4 RAM Disks 22 4.1 Living without a RAM disk . 22 4.2 RAM disk devices . 23 4.3 Loading a RAM disk at boot time . 24 4.4 The initial RAM disk . 24 5 Making Diskette Images without Diskettes 25 6 Hard Disk Installation 26 7 CD-ROM Installation 29 8 Conclusions 31 1 introduction If you use Linux on a production system, you will only see it a few times a year. If you are a hobbyist who compiles many kernels or who uses many operating systems, you may see it several times per day. -
Dell EMC Poweredge Systems Running Red Hat Enterprise Linux 7 Release Notes Notes, Cautions, and Warnings
Dell EMC PowerEdge Systems Running Red Hat Enterprise Linux 7 Release Notes Notes, cautions, and warnings NOTE: A NOTE indicates important information that helps you make better use of your product. CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2014 - 2019 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners. 2019 - 03 Rev. A15 Contents 1 Overview........................................................................................................................................................6 System configuration requirements................................................................................................................................. 6 Memory......................................................................................................................................................................... 6 Installation and upgrade instructions............................................................................................................................... 6 2 Known issues—To be fixed in future releases.................................................................................................7 Unable to create or modify namespace for NVDIMM.................................................................................................. -
The Linux 2.4 Kernel's Startup Procedure
The Linux 2.4 Kernel’s Startup Procedure William Gatliff 1. Overview This paper describes the Linux 2.4 kernel’s startup process, from the moment the kernel gets control of the host hardware until the kernel is ready to run user processes. Along the way, it covers the programming environment Linux expects at boot time, how peripherals are initialized, and how Linux knows what to do next. 2. The Big Picture Figure 1 is a function call diagram that describes the kernel’s startup procedure. As it shows, kernel initialization proceeds through a number of distinct phases, starting with basic hardware initialization and ending with the kernel’s launching of /bin/init and other user programs. The dashed line in the figure shows that init() is invoked as a kernel thread, not as a function call. Figure 1. The kernel’s startup procedure. Figure 2 is a flowchart that provides an even more generalized picture of the boot process, starting with the bootloader extracting and running the kernel image, and ending with running user programs. Figure 2. The kernel’s startup procedure, in less detail. The following sections describe each of these function calls, including examples taken from the Hitachi SH7750/Sega Dreamcast version of the kernel. 3. In The Beginning... The Linux boot process begins with the kernel’s _stext function, located in arch/<host>/kernel/head.S. This function is called _start in some versions. Interrupts are disabled at this point, and only minimal memory accesses may be possible depending on the capabilities of the host hardware. -
Kdump, a Kexec-Based Kernel Crash Dumping Mechanism
Kdump, A Kexec-based Kernel Crash Dumping Mechanism Vivek Goyal Eric W. Biederman Hariprasad Nellitheertha IBM Linux NetworkX IBM [email protected] [email protected] [email protected] Abstract important consideration for the success of a so- lution has been the reliability and ease of use. Kdump is a crash dumping solution that pro- Kdump is a kexec based kernel crash dump- vides a very reliable dump generation and cap- ing mechanism, which is being perceived as turing mechanism [01]. It is simple, easy to a reliable crash dumping solution for Linux R . configure and provides a great deal of flexibility This paper begins with brief description of what in terms of dump device selection, dump saving kexec is and what it can do in general case, and mechanism, and plugging-in filtering mecha- then details how kexec has been modified to nism. boot a new kernel even in a system crash event. The idea of kdump has been around for Kexec enables booting into a new kernel while quite some time now, and initial patches for preserving the memory contents in a crash sce- kdump implementation were posted to the nario, and kdump uses this feature to capture Linux kernel mailing list last year [03]. Since the kernel crash dump. Physical memory lay- then, kdump has undergone significant design out and processor state are encoded in ELF core changes to ensure improved reliability, en- format, and these headers are stored in a re- hanced ease of use and cleaner interfaces. This served section of memory. Upon a crash, new paper starts with an overview of the kdump de- kernel boots up from reserved memory and pro- sign and development history. -
Taming Hosted Hypervisors with (Mostly) Deprivileged Execution
Taming Hosted Hypervisors with (Mostly) Deprivileged Execution Chiachih Wu†, Zhi Wang*, Xuxian Jiang† †North Carolina State University, *Florida State University Virtualization is Widely Used 2 “There are now hundreds of thousands of companies around the world using AWS to run all their business, or at least a portion of it. They are located across 190 countries, which is just about all of them on Earth.” Werner Vogels, CTO at Amazon AWS Summit ‘12 “Virtualization penetration has surpassed 50% of all server workloads, and continues to grow.” Magic Quadrant for x86 Server Virtualization Infrastructure June ‘12 Threats to Hypervisors 3 Large Code Bases Hypervisor SLOC Xen (4.0) 194K VMware ESXi1 200K Hyper-V1 100K KVM (2.6.32.28) 33.6K 1: Data source: NOVA (Steinberg et al., EuroSys ’10) Hypervisor Vulnerabilities Vulnerabilities Xen 41 KVM 24 VMware ESXi 43 VMware Workstation 49 Data source: National Vulnerability Database (‘09~’12) Threats to Hosted Hypervisors 4 Applications … Applications Guest OS Guest OS Hypervisor Host OS Physical Hardware Can we prevent the compromised hypervisor from attacking the rest of the system? DeHype 5 Decomposing the KVM hypervisor codebase De-privileged part user-level (93.2% codebase) Privileged part small kernel module (2.3 KSLOC) Guest VM Applications … Applications Applications Applications … Guest OS Guest OS De-privilege Guest OS Guest OS DeHyped DeHyped KVM KVM’ HypeLet KVM ~4% overhead Host OS Host OS Physical Hardware Physical Hardware Challenges 6 Providing the OS services in user mode Minimizing performance overhead Supporting hardware-assisted memory virtualization at user-level Challenge I 7 Providing the OS services in user mode De-privileged Hypervisor Hypervisor User Kernel Hypervisor HypeLet Host OS Host OS Physical Hardware Physical Hardware Original Hosted Hypervisor DeHype’d Hosted Hypervisor Dependency Decoupling 8 Abstracting the host OS interface and providing OS functionalities in user mode For example Memory allocator: kmalloc/kfree, alloc_page, etc. -
Network Boot and Exotic Root HOWTO
Network Boot and Exotic Root HOWTO Brieuc Jeunhomme frtest [email protected] Logilab S.A. Revision History Revision 0.3 2002−04−28 Revised by: bej Many feedback inclusions, added links to several projects Revision 0.2.2 2001−12−08 Revised by: dcm Licensed GFDL Revision 0.2.1 2001−05−21 Revised by: logilab Fixed bibliography and artheader Revision 0.2 2001−05−19 Revised by: bej Many improvements and included Ken Yap's feedback. Revision 0.1.1 2001−04−09 Revised by: logilab First public draft. Revision 0.1 2000−12−09 Revised by: bej Initial draft. This document explains how to quickly setup a linux server to provide what diskless linux clients require to get up and running, using an IP network. It includes data and partly rewritten text from the Diskless−HOWTO, the Diskless−root−NFS−HOWTO, the linux kernel documentation, the etherboot project's documentation, the linux terminal server project's homepage, and the author's personal experience, acquired when working for Logilab. Eventually this document may end up deprecating the Diskless−HOWTO and Diskless−root−NFS−HOWTO. Please note that you'll also find useful information in the From−PowerUp−to−bash−prompt−HOWTO and the Thin−Client−HOWTO, and the Claus−Justus Heine's page about NFS swapping. Network Boot and Exotic Root HOWTO Table of Contents 1. Introduction.....................................................................................................................................................1 1.1. What is this all about?.......................................................................................................................1 1.2. Thanks...............................................................................................................................................1 1.3. Diskless booting advocacy................................................................................................................1 1.3.1. Buying is cheaper than building.......................................................................................1 1.3.2. -
Creating Custom Debian Live for USB FD with Encrypted Persistence
Creating Custom Debian Live for USB FD with Encrypted Persistence INTRO Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian provides more than a pure OS: it comes with over 43000 packages, precompiled software bundled up in a nice format for easy installation on your machine. PRE-REQ * Debian distro installed * Free Disk Space (Depends on you) Recommended Free Space >20GB * Internet Connection Fast * USB Flash Drive atleast 4GB Installing Required Softwares on your distro: Open Root Terminal or use sudo: $ sudo apt-get install debootstrap syslinux squashfs-tools genisoimage memtest86+ rsync apt-cacher-ng live-build live-config live-boot live-boot-doc live-config-doc live-manual live-tools live-manual-pdf qemu-kvm qemu-utils virtualbox virtualbox-qt virtualbox-dkms p7zip-full gparted mbr dosfstools parted Configuring APT Proxy Server (to save bandwidth) Start apt-cacher-ng service if not running # service apt-cacher-ng start Edit /etc/apt/sources.list with your favorite text editor. Terminal # nano /etc/apt/sources.list Output: (depends on your APT Mirror configuration) deb http://security.debian.org/ jessie/updates main contrib non-free deb http://http.debian.org/debian jessie main contrib non-free deb http://ftp.debian.org/debian jessie main contrib non-free Add “localhost:3142” : deb http://localhost:3142/security.debian.org/ jessie/updates main contrib non-free deb http://localhost:3142/http.debian.org/debian jessie main contrib non-free deb http://localhost:3142/ftp.debian.org/debian jessie main contrib non-free Press Ctrl + X and Y to save changes Terminal # apt-get update # apt-get upgrade NOTE: BUG in Debian Live. -
Linux Core Dumps
Linux Core Dumps Kevin Grigorenko [email protected] Many Interactions with Core Dumps systemd-coredump abrtd Process Crashes Ack! 4GB File! Most Interactions with Core Dumps Poof! Process Crashes systemd-coredump Nobody abrtd Looks core kdump not Poof! Kernel configured Crashes So what? ● Crashes are problems! – May be symptoms of security vulnerabilities – May be application bugs ● Data corruption ● Memory leaks – A hard crash kills outstanding work – Without automatic process restarts, crashes lead to service unavailability ● With restarts, a hacker may continue trying. ● We shouldn't be scared of core dumps. – When a dog poops inside the house, we don't just `rm -f $poo` or let it pile up, we try to figure out why or how to avoid it again. What is a core dump? ● It's just a file that contains virtual memory contents, register values, and other meta-data. – User land core dump: Represents state of a particular process (e.g. from crash) – Kernel core dump: Represents state of the kernel (e.g. from panic) and process data ● ELF-formatted file (like a program) User Land User Land Crash core Process 1 Process N Kernel Panic vmcore What is Virtual Memory? ● Virtual Memory is an abstraction over physical memory (RAM/swap) – Simplifies programming – User land: process isolation – Kernel/processor translate virtual address references to physical memory locations 64-bit Process Virtual 8GB RAM Address Space (16EB) (Example) 0 0 16 8 EB GB How much virtual memory is used? ● Use `ps` or similar tools to query user process virtual memory usage (in KB): – $ ps -o pid,vsz,rss -p 14062 PID VSZ RSS 14062 44648 42508 Process 1 Virtual 8GB RAM Memory Usage (VSZ) (Example) 0 0 Resident Page 1 Resident Page 2 16 8 EB GB Process 2 How much virtual memory is used? ● Virtual memory is broken up into virtual memory areas (VMAs), the sum of which equal VSZ and may be printed with: – $ cat /proc/${PID}/smaps 00400000-0040b000 r-xp 00000000 fd:02 22151273 /bin/cat Size: 44 kB Rss: 20 kB Pss: 12 kB..