MAGIC SYSRQ KEY


MAGIC SYSRQ KEY

Linux Kernel Testing - Know Your Contribution
kobject debugging [*] Compile the kernel with debug info * [*] Debug VM [*] Debug linked on [*] Debug page memory allocations [*] Magic SysRq key ? These short cut
http://foss.in/2007/register/slides/Linux_Kernel_Testing_-_Know_Your_Contribution_300.2.pdf

LinuxMZ User Manual
USB devices : modem, printer, HID, keyboard, mouse, Wacom graphic tablet, event interface, scanner, Kodak dc-2xx camera, DABUSB and Kawasaki USB Ethernet. The magic "SysRq" key is
http://engineering.tri-m.com/linux_OS/linuxmz_man.pdf

Securing & Hardening Linux v1.0
conf.all.accept_redirects = 0 net.ipv4.conf.lo.accept_redirects = 0 net.ipv4.conf.eth0.accept_redirects = 0 net.ipv4.conf.default.accept_redirects = 0 # Disables the magic-sysrq key
http://www.packetstormsecurity.org/papers/general/Securing_and_Hardening_Linux_v1.0.pdf

BlueCat Linux Board Support Guide
Special Notes BlueCat Linux Board Support Guide for Protom PR818A Boards vii Special Notes The following notations highlight any key points and cautionary notes that may appear in this
https://www.lynuxworks.com/support/bluecat/docs/bluecat40/0600-00-bcl4_pr818a_bsg.pdf

Upgrading a Kernel
kconfig/conf -s arch/i386/Kconfig # # using defaults found in .config # * * Restart config * * * Kernel hacking * Show timing information on printks (PRINTK_TIME) [Y/n/?] y Magic SysRq key
http://www.linuxinsight.com/files/lkn/ch06.pdf

Deploying Oracle 10g on Red Hat Enterprise Linux v.3
lines to /etc/sysctl.conf: # Disables packet forwarding net.ipv4.ip_forward = 0 # Enables source route verification net.ipv4.conf.default.rp_filter = 1 # Disables the magic-sysrq key
http://www.cxolinux.com/linux/jsp/action.jsp?act=download_redirect&article_id=2713&cat_id=1244&file=pdf

KNOW-HOW Ask Klaus!
To be sure that all data arrives on disk, you can enforce a filesystem sync by pressing the magic sysrq key combination, Alt+Print+S, before power-off or reset. MySQL is still
http://www.linux-magazine.com/w3/issue/80/Ask_Klaus.pdf

Securing SunLinux Systems: Part I, Local Accessand File Systems
to the LILO Boot Loader"on page 15 ? "Disable Control-Alt-Delete Reboot Key Sequence"on page 16 ? "Require Single-User Mode Password"on page 16 ? "Disable the Magic SysRq Key"on
http://www-cdn.sun.com/blueprints/0703/817-3420.pdf

1 Overview of Failure Analysis
dump by entering the following command # echo c > /proc/sysrq-trigger or by pressing the Alt-SysRq-C key combination. (2) Setting Kernel ? Is 'y' assigned to "CONFIG_MAGIC_SYSRQ="? If
http://www.ipa.go.jp/software/open/forum/north_asia/download/4-051ostec-1_e.pdf

MLN7400 S/W USER'S MANUAL
If a key application depends heavily on such structuring, then it may be necessary to re-create the application. „ The use of vfork call or utilization of multiple threads instead
http://www.mcslogic.com/pds/1_MLN7400_SW_DS_V1.00.pdf

The Linux Gamers' HOWTO
At high levels, you might get a magic sword or a kick-butt assault rifle. RPG's generally However, if the problem is repeatable "it happens when I press the left arrow key twice
http://crouse.us/docs/Misc/Linux-Gamers-HOWTO.pdf

Linux web browser station (formerly "The Linux Public Web Browser mini ...
route verification net.ipv4.conf.all.rp_filter = 1 # Disables automatic defragmentation (needed for masquerading, LVS) net.ipv4.ip_always_defrag = 0 # Disables the magic-sysrq key
http://crouse.us/docs/Misc/Public-Web-Browser.pdf

Orginally obtained from http://slackware.osuosl.org
However, make sure you remove them from the blacklist if you ever decide to use the (recommended) generic kernels. The Slackware kernels now include support for the "magic SysRQ key.
http://www.linuxpackages.net/gen_pdf.php?file=slack_upgrade-12.html

Configuring the Kernel
17 Configuring the Kernel 101 Magic Sys rq ? On a desktop system Turn on Magic SysRq key in kernel hacking ging key ? In the unlikely event of a system ? crash? (not responding
http://foss.lk/slides/2006/may_foss-ed/KernelConfiguration.pdf

An Introduction to Linux Kernel Debugging
Magic sysrq key usually ALT-PRINTSCREEN on x86 BREAK on serial console often disabled on distributions echo "1" > /proc/sys/kernel/sysrq It can: sync data to disks s remount partitions
http://www.stillhq.com/pdfdb/000460/data.pdf

Who ya Gonna Call With a Kernel Bug?
Alt - SysRQ ? Kernel debugging from the keyboard! ? If CONFIG_MAGIC_SYSRQ=y Alt - SysRQ - C Alt - SysRQ - C ? The following three-key commands are available (page 1 of 3) Alt
http://tlug.ss.org/images/a/a7/Kernel_Bug_Talk.pdf

SQL Server 2000 I/O Configuration in a SAN/NAS Environment
of the /etc/sysctl.conf file. # Disables packet forwarding net.ipv4.ip_forward = 0 # Enables source route verification net.ipv4.conf.default.rp_filter = 1 # Enables the magic-sysrq key
http://www.perftuning.com/pdf/Oracle9iLinux.pdf

Debugging Techniques
information if you want to debug the kernel with gdb . You may also want to enable CONFIG_FRAME_POINTER if you plan to use gdb . CONFIG_MAGIC_SYSRQ Enables the"magic SysRq"key.
http://oreilly.com/catalog/linuxdrive3/book/ch04.pdf

Linux Kernel Hacking Free Course
Debugging by printing: printk loglevels and ogging rocess Debugging by printing: printk loglevels and ogging rocess When the stem seems to hang: the magic SysRQ key When the stem
http://bravo.ce.uniroma2.it/kernelhacking2006/lkh06_4_s.pdf

Tips and Tricks
It used to be that you had to enable this "magic key combo" when compiling a kernel but this is no longer necessary. (If your computer does not have a SysRq key then look for the
http://www.freesoftwaremagazine.com/node/2375/pdf

New Kernel Crash-Exploit discovered (Linux Reviews)
on line users then do not test this code on that box. If you enabled Magic SysRq (CONFIG_MAGIC_SYSRQ=y, found in make menuconfig at Kernel hacking -> Magic SysRq key) in your kernel
http://linuxreviews.org/news/2004/06/11_kernel_crash/11_kernel_crash.en.pdf

New Kernel Crash-Exploit discovered (Linux Reviews)
server with 1000 on line users then do not test this code on that box. If you enabled Magic SysRq (CONFIG_MAGIC_SYSRQ=y, found in make menuconfig at Kernel hacking -> Magic SysRq key
http://linuxreviews.org/news/2004/06/11_kernel_crash/11_kernel_crash.en.print.pdf

Install tip and techniques
The sequence is "alt", "sysrq" and any of following magic keys. A table follows that lists the Magic sysrq key and the corresponding functionality. Functionality Magic sysrq key sync
http://dsvolk.ru/oracle/linux/installtips_final.pdf

Building a Linux Super Kernel for Data Forensics
If you can type faster than you speak and you believe a mouse is something that should be running through a field or taking a siesta in a mouse trap and you understand Magic SysRq key
http://www.crazytrain.com/monkeyboy/FSK.pdf

Your kernel just oopsed-What do you do, hotshot?
Magic SysRq More info at Documentation/sysrq.txt. a'magical'key combo you can hit which the kernel will respond to regardless of whatever else it is doing, unless it is completely
http://www.mulix.org/lectures/kernel_oopsing/kernel_oopsing.pdf

By: Todd Shipway
Packets, Redirect Packets net. ipv4. conf. all. log_mar ti ans = 1 net. ipv4. conf. lo. log_mar ti ans = 1 net. ipv4. conf. eth 0 . log_mar ti ans = 1 # Disables the magic-sysrq key
http://www.cpanel.net/docs/seminar07/Security_2.pdf

Getting in the Fast Lane with Red Hat Support
ALT-SysRq-m print memory information ? ALT-SysRq-t print task (process) list ? ALT-SysRq-w show CPUs (Red Hat specific) ? More keys at http://en.wikipedia.org/wiki/Magic_SysRq_key
http://www.redhat.com/

Debugging Embedded Linux: Tools & Strategies
Magic SysRq Key * Warning: use at your own risk! * Assumes you "know what you are doing" ? i.e. reboot w/o sync is single-letter command! * Can be used to learn something from otherwise
http://www.mobilinux.com/download/fetchdoc.php?docid=143

Kernel Debugging with netdump and crash
Testing your netdump setup ? You will want to enable the magic sysrq key:-# sysctl w kernel/sysrq=1 ? And panic_on_oops-# sysctl w kernel/panic_on_oops=1 ? Check hat tlog
http://www.wlug.org/files/netdump_crash.pdf