Fedora Security :: Turn Off Ordered Data Mode?
Dec 8, 2009
I am currently trying to turn off ordered data mode for ext3 filesystem. I want to shred some files and apparently this won't work with journaling on.
I can't seem to find any good explanations of what exactly "ordered data" means in terms of data recovery/security...or at least none that are written in simple n00b terms. It is all written in terms of disk crashes and whether old data will mix in with the new. It doesn't say whether one's cousin will be able to poke around and find some thought-it-was-deleted porno if he's on the computer.
Can someone step me through the process of turning this off using tune2fs? (if that is the best way to do it!) Do I have to revert to ext2? Can I turn it back on later? Will I lose data (for example, does the drive need to be reformated?) once this change is made? And how does one find, read, and delete/shred the journal itself? Is "ordered data" even a real problem for data recovery?
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Jan 20, 2010
At boot time, before entering Runlevel 3 the HDD will go mad when mounting tmpfs on /dev/shm...
Code:
EXT3 FS on sda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
INIT:Entering runlevel 3
It will go on and on at the tmpfs on /dev/shm type tmpfs (rw) until i press ctrl-C...then I will stop whatever it is doing, let the hdd rest a bit, and resume normal boot..
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Jan 11, 2011
Given the following data structure: Quote:
[Code]...
What is the minimum possible MySQL query to get a random data selection that includes each Index number only once and ordered ascending. The maximum index number is known. For example running the query should get the following data: 01, 06, 07, 02. Running the query again, you may get the same data or another possible combination like: 01, 05, 07, 04. Of course you could run a loop for 1 to max_index and process a random ordered data selection until the next index number is found. But I think this will result in too many database access. Also you could run max_index queries to get all IDs that correspond to the given index and randomly select one ID for each index.
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Sep 4, 2010
I installed fedora 13 in its LXDE flavor in my laptop. I noticed when it goes to save energy mode, the TFT retro-illumination is not turned off. The display just stays black with light. How to make the display to turn off when the system enters in save energy mode?
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Jan 12, 2011
I was reading about ext3 feature and I have read about its journaling modes. I would like to ask what is the default journaling mode of ext3 fs in slackware(or is it in all distro using ext3)? I'll install slackware when my new pc arrive and the fs I will use will be ext3 and I like it to have data=journal mode for its journaling. I have read in some wiki how to set the journaling mode into data=journal mode.
Code: # tune2fs -O has_journal -o journal_data /dev/sdXY Do i need to issue this command or is this the default mode in ext3 in slackware?
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Dec 10, 2009
I'm trying to find out which application will copy DVD discs (video and data) in raw mode. Something that works for DVDs like cdrdao works for CDs. I tried using cdrdao but it errors out because the DVD disc is too big for it. I tried looking at Brasero but I can't tell if it offers a raw option. I see that Brasero lets you copy a DVD to a RAW image, then burn the RAW image back to a DVD-R. If Brasero uses RAW mode to do a direct copy, this would essentially do the same thing, but I can't tell if that is what it does. But, I think this will work.
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Nov 18, 2010
I've looked today on my logs /var/log/message and I find device eth0 entered promiscuous mode I don't remember putting eth0 in promiscuous mode I'm connected to the net thru a router how do i turn that off ?
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May 18, 2011
I've upgraded to 11.04 and now my desktop environment sucks (it's just as useless as an Apple desktop environment, should I report a bug?).
How do I restore normal functionality?
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Feb 26, 2011
Disclaimer: I have very little linux desktop experience...I've only used command line stuff for work in my previous life. I am joyfully coming off of a long addiction to MS but am having a bit of a hard time adjusting.
ISSUE: I can't seem to figure out how to turn off suspend mode. I have turned every setting I could find in the power management to "do nothing" and I have turned off all of my power mgmt options in the system bios. A "friend" suggested I remove HAL...which caused me to lose my secondary internal HD and all of my usb devices...and the issue persisted. Every 20 minutes of no action the screen blanks and my monitor goes into standby mode which is making watching movies in bed a less than relaxing experience.
Some background that may or may not be useful: I installed kubunutu 10.04 (2.6.32-28-generic) from cd on a fresh HD. Initially I had issues with the wireless network and alsa/pulse sound. I worked through those through much trial and error but the suspend issue persists. I've uninstalled and re-installed lots of packages I probably shouldn't have been messing with and would really like to avoid a reinstall as this seems to be the final fix I need to get things running the way I want them.
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Oct 21, 2010
I've got a problem with bash, when I run my terminal or I turn into console mode, I get:
Code:
And I have to type "bash" and after I got:
Code:
How to make that bash alway running?
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Apr 1, 2009
Can anybody have an idea of an ftp client code using raw ftp commands.
OR
Can anybody tell me how to turn off passive mode using raw ftp commands.
PASV is the command which turns on passive mode but there is no such alternative of active mode.
I have already tried using pasv_enable=NO in vsftpd.conf but that is not working.
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Nov 3, 2010
How to configure Linux text console to automatically turn of the monitor after some time? And by "text console" I mean that thing that you get on ctrl+alt+F[1-6], which is what you get whenever X11 is not running. And, no, I'm not using any framebuffer console (it's a plain, good and old 80x25 text-mode). Many years ago, I was using Slackware Linux, and it used to boot up in text-mode. Then you would manually run startx after the login. Anyway, the main login "screen" was the plain text-mode console, and I remember that the monitor used to turn off (energy saving mode, indicated by a blinking LED) after some time. Now I'm using Gentoo, and I have a similar setup.
The machine boots up in text-mode, and only rarely I need to run startx. I say this because this is mostly my personal Linux server, and there is no need to keep X11 running all the time. (which means: I don't want to use GDM/KDM or any other graphical login screen). But now, in this Gentoo text-mode console, the screen goes black after a while, but the monitor does not enter any energy-saving mode (the LED is always lit). Yes, I've waited long enough to verify this. Thus, my question is: how can I configure my current system to behave like the old one? In other words, how to make the text console trigger energy-saving mode of the monitor?
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Jun 1, 2009
I just discovered that my server is sending huge amount of data out at about 1Mbps. My immediate thought was the deluge bittorrent client, however it is supposedly not running (and a check confirmed its total active torrents was set to 0). I turned off the network and went in to Firestarter to set the outbound traffic to restrictive, turned on network again and no more data was sent. A look in Firestarter / Events showed a long list of random ports being used (see further down). How can I identify what program is sending all the data?
In Firestarter it doesn't really say much more than the port. Not sure if it is some misconfigured program or a malware/virus. I just got my ADSL connected a few days ago, and before that I used a mobile broadband (3G) as I just relocated. During the period I used the 3G the server might have been without firewall for a few days and it was also at this time I discovered an increase in network traffic (but I didn't really pay much attention at that time). I am running Fedora 10.
List of events from firestarter, my server is 192.168.1.100:
Time:Jun 1 16:48:12 Direction: Outbound In: Out:eth1 Port:39435 Source:192.168.1.100 Destination:58.208.xxx.56 Length:129 TOS:0x00 Protocol:UDP Service:Unknown
Time:Jun 1 16:48:12 Direction: Outbound In: Out:eth1 Port:6990 Source:192.168.1.100 Destination:112.94.xxx.212 Length:129 TOS:0x00 Protocol:UDP Service:Unknown
Time:Jun 1 16:48:12 Direction: Outbound In: Out:eth1 Port:2973 Source:192.168.1.100 Destination:118.93.42.xxx Length:129 TOS:0x00 Protocol:UDP Service:Svnetworks .....
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Aug 8, 2010
When I am installing texlive package power gone suddenly. From that time onwards yum update command is not working. It is giving error as follows:
Loaded plugins: presto, refresh-packagekit, security [URL]: [Errno 14] HTTP Error 404 : [URL]
Trying other mirror.
Skipping security plugin, no data
Setting up Update Process
Resolving Dependencies
Skipping security plugin, no data
--> Running transaction check
--> Processing Dependency: libkpathsea.so.4 for package: evince-dvi-2.30.3-1.fc13.i686
---> Package texlive-kpathsea-doc.noarch 0:2010-8.svn19287.fc13 set to be updated
--> Finished Dependency Resolution
Error: Package: evince-dvi-2.30.3-1.fc13.i686 (@updates)
Requires: libkpathsea.so.4
Removing: kpathsea-2007-51.fc13.i686 (@updates)
Available: kpathsea-2007-49.fc13.i686 (fedora)
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
I already tried this commands but again I have problem:
yum-complete-transaction first
rpm -e texlive
yum install libkpathsea.so.4
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Feb 28, 2011
How can I generate a list of files in a directory [e.g.: "/mnt/hdd/PUB/"] ordered by the files modification time? [in descending order, the oldest modified file is at the lists end]
ls -A -lRt would be great:[URL]
But if a file is changed in a directory it lists the full directory...so the pastebined link isn't good [i don't want a list ordered by "directories", I need a "per file" ordered list]
OS: openwrt..[no perl -> not enough space for it :( + no "stat", or "file" command]
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May 23, 2010
Will I need to actiavte the firewall that comes with Ubuntu since I'm using Transmission?
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Mar 17, 2010
I'm running Apache2 under uBuntu 9.10. My problem is that I use my own user "wavesailor" to work on my websites. I kept all my sites under /var/www and I set up the security of the directory after following the guidelines.
Code:
sudo chown -R root:root /var/www
sudo chown -R www-data:www-data /var/www/*
[code]...
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Nov 12, 2010
Tried the apparmor profile for Firefox. how to turn it off. No matter what I do, it still shows up as being on in apparmor status.
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Mar 10, 2011
I'm trying to turn off SSH root login on Ubuntu 10.10. However, changing PermitRootLogin=no (/etc/ssh/sshd_config) do not work. Here is the sshd_config:
[code]...
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Nov 12, 2010
I remember my password very well and have no need of password recovery. Everywhere I look it's how to recover and I don't want that. The kind where you boot into root recovery console to change the password.
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Mar 12, 2010
Today I wanted to make a backup of my Ubuntu server. Since the program wasn't working for me, I rebooted my computer and right now it wont boot. Now I entered recovery mode and I'm trying to recover my /var/www and /etc/mrtg folders. I want to copy them to my USB-Stick but Ubuntu wont do this.
The command I tried: Code: cp -r /var/www /dev/sdg1/www I already created the folder via a other system. I also tried to mount the USB stick: Code: mount /dev/sdg1 /mnt/usbe But im getting the following error: error while loading shared libraries: /lib/libsepol.so.1: Invalid ELF header.
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Jan 31, 2011
Can any data be lost on ext4 with full journalling mode when electricity crashes? I know it's possible on filesystems like JFS and XFS because they don't journal data (only metadata). When ext4 in "journal" mode journalles both - data and metadata. Does it give 100% guarantee that no data can ever be lost in case of problems with electricity?
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May 6, 2010
I am not able to detect my USB hard drive in Linux rescue mode after passing "fdisk -l" as i want to take the data backup in my USB hard disk.
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Jun 13, 2011
I am an emacs user, and I noticed that on my new machine (running F15, 64bit) flyspell-mode will not work in tex mode.
I get errors that look something like this:
Code:
Spell-checking inequality-model.tex using hunspell with default dictionary...
Spell-checking region using hunspell with default dictionary...done
ispell-send-string: Process ispell not running
When done with a buffer, type C-x #
code....
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Aug 30, 2010
Below is a print out of my partition Table from Fdisk, in Cylinder mode, Sector mode, and then in expert mode?
Why in expert mode does it look like Partitions 2 and 3 share the same sector / hd / Cylinders? Is this OK?
Code:
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May 13, 2010
I recently installed Ubuntu and noticed when I load 'Recovery Mode' from Grub, I am not asked for a password. Since you can change the login password from there, is there a way to add a password to this?
I would like to be prompted for a password before the recovery mode starts.
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Jul 14, 2010
A friend has a embedded system (korg recorder) with a ata drive in it, that crashed. We are trying to come up with ways to retrieve the data off of the drive. I'm asking in security as this seems like it would be close to forensics, hence security. Hints on software for linux to help either recover files, move files, copy/clone the drive? I'm not so concerned about the korg's os on the drive, as we can create a new blank drive and install that, its the data that is critical, that needs to be recovered. The original korg os was only recognizing drives up to 100gbs so I'm guessing this might be a fat16 filesystem if that helps. Well, that and the program installed to the drive to run it in the korg is an exe.
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May 6, 2010
I need to be able to decrypt data, like simple text files, that have been encrypted and base64 encoded with my public key.I need to use openssl so i do:
Code:
$cat encrypted | openssl enc -base64 -d > ./answer.txt
and i get exactly the same data as before the command was run. Am i right in thinking that i need to decode before decrypting? I tried decrypting, before i realized that i had to decode first,using this command:
[Code]...
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Nov 1, 2010
i tried my best andwrite all the commands given below. but port 27000 is not in listening state.Note: I spoofed MAC address (change MAC address)on this MAchine.here is my iptables file.
# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
*filter
[code]....
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Nov 4, 2009
I have Ubuntu 9.04, and a HP laserjet 1018 printer.
I install the printer using:
And when it ask me about plugin I give the path to it. (the 3.9.2 version of the plugin, because Ubuntu 9.04 has the 3.9.2 version of hplip)
well I install the printer, everything works perfectly.....but, when I turn off the PC, and turn it on again, the printer does NOT work!, I send work for being printed but mothing happens , Ubuntu tells me that the job was printed but ... no case, my printer does not print it.
I have to install it again since cero. what can I don to stop install it every time I turn off the computer ?
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