Letters to the Editor
This was our first buyer's guide and we made some mistakes, but we learned from them and plan to have an even better issue next time. One of the things we are most concerned about is data gathering methods. For this issue, other than the sunsite listings, we printed only what was sent to us. If you did not send in updated information, we would not have updated it for you. Red Hat obviously did send in updated information. If you did send in updated information, then I apologize for the table not getting updated. Actually, in either case, I apologize. Next time, we'll include a check for the latest distributions in our procedure. We do know what the current distributions are.
Mr. Kraft's comments in the March 1997 issue of Linux Journal, regarding Linux's lack of network file locking services, are dead on the mark; however, I would now like to make it publicly known that there is an ongoing development effort to provide a lockd and statd for Linux.
This effort is currently combined with an effort, led by Olaf Kirch, to revise major portions of the Linux NFS implementation. A kernel-space lockd, written by Olaf, and a user-space statd, initially written by me and then significantly modified by Olaf, are currently part of Olaf's NFS development distribution “snapshots”.
A developers' mailing list exists for people who wish to contribute to, or participate in the alpha/beta testing of, this development effort. The list address is email@example.com, and the list's subscription address is firstname.lastname@example.org. Current snapshots of the linux-nfs development code can be retrieved from the following anonymous FTP directories:
There are currently plans to publish an introduction to network file locking, together with a description of the Linux implementation, in an upcoming issue of Linux Journal. In addition, I will be giving a short presentation on this subject at the April 1997 Linux Expo in Raleigh, North Carolina. —Jeff Uphoff email@example.com
If you are going to do a security article, get it right. People get cgi and suid programs wrong on their own without your printing an article that contains serious errors. A good article on cgi security would have been just what is needed. Unfortunately this wasn't it.
Let's take this:
If I run this handy provided example by doing:
cd HACKDIR cp /bin/hash ./home ln -s suidxi—program ./foo IFS='/' export IFS ./fooI get a shell as the person it is setuid to.
Why? Because the system runs the command through the shell, and the shell uses IFS as its “white space” definition.
This is basic setuid security stuff.
The procmail-based example at least does use a magic cookie to stop fake mails. It has other bugs; notably, it forgets sendmail may deliver multiple mails in parallel using data, but then I guess it makes it plain it's just trying to show the trick, not do it right. —Alan Cox firstname.lastname@example.org
Hi. I have been a longtime reader of LJ and it has been a great help to me, and I am sure that applies to many in the Linux Community! Now, my friends on the Net and I have also done something as a contribution to Linux which I thought would be interesting to you and helpful to your readers. We have created an On-Line Linux Users Group for people interested in learning more about Linux, providing help to other Linuxers, and promoting Linux:
http://www.linuxware.com/ —Peter Lazecky email@example.com
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.View Now!
|The Firebird Project's Firebird Relational Database||Jul 29, 2016|
|Stunnel Security for Oracle||Jul 28, 2016|
|SUSE LLC's SUSE Manager||Jul 21, 2016|
|My +1 Sword of Productivity||Jul 20, 2016|
|Non-Linux FOSS: Caffeine!||Jul 19, 2016|
|Murat Yener and Onur Dundar's Expert Android Studio (Wrox)||Jul 18, 2016|
- The Firebird Project's Firebird Relational Database
- Stunnel Security for Oracle
- My +1 Sword of Productivity
- SUSE LLC's SUSE Manager
- Non-Linux FOSS: Caffeine!
- Managing Linux Using Puppet
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Parsing an RSS News Feed with a Bash Script
- Google's SwiftShader Released
- Doing for User Space What We Did for Kernel Space
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide