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  • Linux security: The dangers of executing malignant code as a standard user

    - by AndreasT
    Slipping some (non-root) user a piece of malignant code that he or she executes might be considered as one of the highest security breaches possible. (The only higher I can see is actually accessing the root user) What can an attacker effectively do when he/she gets a standard, (let's say a normal Ubuntu user) to execute code? Where would an attacker go from there? What would that piece of code do? Let's say that the user is not stupid enough to be lured into entering the root/sudo password into a form/program she doesn't know. Only software from trusted sources is installed. The way I see it there is not really much one could do, is there? Addition: I partially ask this because I am thinking of granting some people shell (non-root) access to my server. They should be able to have normal access to programs. I want them to be able to compile programs with gcc. So there will definitely be arbitrary code run in user-space...

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  • linux/shell: change a file's modify timestamp relatively?

    - by index
    My Canon camera produces files like IMG_1234.JPG and MVI_1234.AVI. It also timestamps those files. Unfortunately during a trip to another timezone several cameras were used, one of which did not have the correct time zone set - meta data mess.. Now I would like to correct this (not EXIF, the file's "modify" timestamp on disk). Proposed algorithm: 1 read file's modify date 2 add delta, i.e. hhmmss (preferred: change timezone) 3 write new timestamp Unless someone knows a tool or a combination of tools that do the trick directly, maybe one could simplify the calculation using epoch time (seconds since ..) and whip up a shell script. Any help appreciated!

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  • Linux: Can I link multiple destinations via softlinks?

    - by kds1398
    Attempting to end up with something similar to this: $ ls -l lrwxrwxrwx 1 user group 4 Jun 28 2010 foo -> /home/bar lrwxrwxrwx 1 user group 4 Jun 29 2010 foo -> /etc/bar The intention is to be able to move a file to foo & have it go to both destination directories for now. The goal is to eventually unlink /home/bar link after confirming there are no issues with moving the files to /etc/bar. I am restricted in that I am unable to change or add to the process that moves the files.

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  • Linux web server shared hosting file errors

    - by dfilkovi
    I'm using a shared hosting to host my website and have some problems with files from time to time. First, one of my file (php) was missing a part of code (nothing to do with hackers just a random piece of code was missing), then after some time a value inside a mysql table was also missing a part, then a whole table column disappeared, after that a whole file on my site disappeared and lastly again some code from a file disappeared, my hosting service says it has nothing to do with them, but this is stupid, how can this happen, no hacker attack could do such a thing, I believe it's some kind of a disk corruption or bad backup. Anyone have any ideas?

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  • Linux - Block ssh users from accessing other machines on the network

    - by Sam
    I have set up a virtual machine on my network for uni project development. I have 6 team members and I don't want them to SSH in and start sniffing my network traffic. I already have set the firewall on my W7 pcs to ignore any connection attempts from the Virtual Machine, but would like to go a step further and not allow any network access from the VM to other machines on my network. Team members will be access the VM by SSH. The only external port forwarded is to vm:22. The VM is running in VirtualBox on a bridged network connection. Running latest Debian. If someone could tell me how to do this I would be much obliged.

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  • Routing using Linux with 2 NIC cards

    - by Kevin Parker
    Configured Clear OS to be in Gateway mode on a machine with two NIC cards. eth0:192.168.2.0/24 with ip 192.168.2.27 which is connected to a modem and thus have internet connectivity. eth1:192.168.122.0/24 with ip 192.168.122.10 which is connected to other machines in LAN through switch. LAN machines with network 192.168.122.0 is not getting internet.How can they get internet Through Clear OS gateway.I have enabled packet forwarding in clear os using "ip_forward=1" What am i missing?.Can you please help me in this. Following are the static routing i have added: on LAN machine1 with ip address 192.168.122.11 ip route add 192.168.2.0/24 via 192.168.122.10 dev eth0 ip route show 192.168.2.0/24 via 192.168.122.10 dev eth0 192.168.122.0/24 dev eth0 proto kernel scope link src 192.168.122.11 But still 192.168.2.0/24 network is not reachable.Where can be the problem??

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  • add script on boot linux machine

    - by user1546679
    I have one script to start a service on my ubuntu. I added it on boot machine using "# update-rc.d projeto defaults". But it still doesn't start with the boot machine. I think is because I am using other user to start the script "su - www-data -c ...". But I am not sure, because I run the update-rc.d command as root. When I execute the script from a terminal, it asks the password of the user www-data. Does anyone know what is happening? Thanks a lot! Felipe #!/bin/bash # /var/www/boinc/projeto/bin/start function action { su - www-data -c "/var/www/boinc/projeto/bin/$1" } case $1 in start|stop|status) action $1 ;; *) echo "ERRO: usar $0 (start|stop|status)" exit 1 ;; esac

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  • Installing softare on Linux

    - by Dimen Shaw
    I'm trying to install the GMP package on Redhat 4, x86_64. The package can only be installed using make, which is not available and should be installed with apt-get/yum, but I don't have either one of them. I tried installing them using rpm, but they each require lots of dependencies themselves, which although finite in amount seem like a VERY tedious job to do. Any help on how I should go about solving this?

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  • Linux - quota per directory?

    - by depesz
    I have following scenarios: Single partition mounted as /, with lots of disk space. There is a range of directories (/pg/tbs1, /pg/tbs2, /pg/tbs3 and so on), and I would like to limit total size of these directories. One option is to make some big files, and then mkfs them, and mount over loopback, and then set quota, but this makes expansion a bit problematic. Is there any other way to make the quota work per directory?

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  • Linux Read-Ahead Downsides

    - by JPerkSter
    Hi Everyone, Hope all is well. I have a question regarding read-ahead caching. Are there any downsides to raising the size of the read-ahead cache? On our farm, we're currently running at 256, and upon raising that higher, we are seeing significant throughput gains.   [root@server~]# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 7352 MB in 2.00 seconds = 3677.62 MB/sec 3 Timing buffered disk reads: 244 MB in 3.10 seconds = 78.68 MB/sec [root@server ~]# blockdev --setra 10240 /dev/sda [root@server ~]# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 11452 MB in 2.00 seconds = 5728.52 MB/sec Timing buffered disk reads: 422 MB in 3.17 seconds = 133.04 MB/sec We are running on 2.6. Thanks!

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  • Backup linux to ftp server

    - by Alakdae
    What do you use for backups to ftp server? I've tried the setup with Amanda and virtual tapes on the ftp server mounted with Curlftpfs and I'm not satisfied with it. I just don't feel confident about Amanda. Also I cannot use anything that uses rsync on the ftp mounted filesystem because it only creates the directories and doesn't create files as it cannot execute "mkstemp". I've been thinking about Bacula but I can't find any good HOWTO for it.

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  • Linux file copy with ETA?

    - by bobby
    I'm copying a large amount of files between disks. There's approximately 16 GB of data. I'd like to see progress information, and even an estimated time of completion from the command line. Any advice?

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  • Renicing complex multithreaded applications in Linux

    - by Vi
    Applications (especially big Java and C++ ones) often shows up as multiple lines in htop, each have separate PID and separate nice level. Also application can spawn a lot of child processes (like as in aptitude update), so I need to affect both parent one (to make new children have new priority) and child ones (to bring the effect immediately, not after the child terminates) How can I apply "renice" or "ionice" or "schedtool" to already launched big application?

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  • Conditional `mount` in Linux: dev or nfs

    - by o_O Tync
    I have a mount point — let it be /media/question — and two possible devices: a physical HDD and a remote NFS folder. Sometimes I plug the device in physically, in other cases I mount it via NFS. Is there a way to specify both of them in fstab so that executing mount /media/question will preferably choose physical volume, and when it's not available — NFS?

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  • Linux Directory Access Problem: Permission Denied """In Root"""

    - by RBA
    Hi, When login through root on HP-tru Unix server, I am trying to access a directory, it is saying "Permission Denied".. Also, an sh file is also not able to execute through same root access.. I have checked the permission of the directory as well as for sh file through ls-ltr.. It is also fine.. Root System rwx-rwx-rwx-- What could be the possible cause, and how to correct it.. Thanks.

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  • Ubuntu Linux: Process swap memory and memory usage

    - by David Halter
    My Ubuntu eats more memory than the task manager is showing: sudo ps -e --format rss | awk 'BEGIN{c=0} {c+=$1} END{print c/1024}' 1043.84 free -m total used free shared buffers cached Mem: 3860 1878 1982 0 20 679 -/+ buffers/cache: 1178 2681 Swap: 2729 1035 1693 That's strange. Can someone explain this difference? But what is more important: I'd like to know how much memory a process is really using. I don't want to know the virtual memory size, but rather the resident memory plus swap of a process. I have also tried to output the format param "sz" of 'ps', but the sum of this is to high (5450 MB) (param 'size' gives 8323.45 MB). Are there any other options? I really want to use this, to determine which programs/processes are eating to much memory (and swap), to kill them, because hibernate might not be working if the swap partition is to little.

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  • Linux CPU Hog report

    - by bmaynard
    I am wondering if there is a tool that will monitor all the process and send a daily report of which process where hogging resources per hour or something similar? What I am after is when I see my cpu go up at certain times of the day, I want to know which processes where using the resources at that time.

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  • Which linux x86 hardware keystore?

    - by byeo
    I'm terminating SSL/TLS in my DMZ and I have to assume that machine will be hacked. At which point my certificates are compromised. Previously I've used nCipher hardware keystore/accelerator to solve this issue. These cards won't reveal the private key even to root. The card performs the encryption and decryption onboard and is hardened against physical attack. The only way to get at the keys is by attaching a smart card reader to the card itself. I'm having trouble finding information about something to recreate this approach. Is this the domain of specialist switches and firewalls these days? This old page references some of the old hardware: http://www.kegel.com/ssl/hw.html#cards

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  • How to distill / rasterize a PDF in Linux

    - by Sampo
    We have a printer at our office that prints PDF files from a USB stick. It prints most files okay, but it has problems with some, especially ones generated with Latex. Some PDFs it simply refuses to print, some PDFs it prints with courier-type font, and some it prints fine except for equations. I'm looking for a way to "distill" PDFs into a dead-sure format to print. Either by simplifying / normalizing the PDF to the point that any renderer will render it correctly, or by simply making each page a 600dpi raster image in the PDF. (I could split the PDF into individual raster images and combine them manually, but I want something scriptable.) The output file size doesn't matter, as long as it's sure to print, has A4 paper size (or the original) and 300~600dpi resolution.

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  • SAMBA and Linux ACLs -- "Permission denied" on write to share but file written nevertheless

    - by MCH
    I set up a writable share directory "/home/net/share" with acl like this: sudo mkdir -p "/home/net/share" sudo setfacl -m "u:localuser:rwx,u:remoteuser:rwx,g:users:rwx" "/home/net/share" My /etc/samba/smb.conf looks like this: [global] workgroup = w server string = server security = user load printers = no log file = /var/log/samba/%m.log max log size = 50 dns proxy = no printing = bsd printcap name = /dev/null disable spoolss = yes encrypt passwords = true invalid users = nobody root follow symlinks = yes wide links = yes [share] comment = Writable by localuser and remoteuser path = /home/net/share valid users = remoteuser read only = no public = no printable = no Locally, localuser and remoteuser have user accounts and smbpasswds and can both read, create and delete files in /home/net/share. But when I log on from a different machine (like this: sudo mount -t cifs //server/share mountpoint/ -o username=remoteuser ), I get "Permission denied" both when trying to create directories and files, oddly though, it does create files (not directories!) despite these messages! How can I get this working?

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  • libkeybinder error Arch linux

    - by Nihar Sarangi
    I am trying to install a package that depends on python-keybinder and hence on libkeybinder. When I run makepkg for libkeybinder, it starts and after sometime I get the following error: checking for XkbQueryExtension... no configure: error: Could not find XKB ==> ERROR: A failure occurred in build(). Aborting... ==> ERROR: Makepkg was unable to build libkeybinder. I tried checking the pkgbuild but wasn't able to find anything. :( Is there a workaround?

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  • Networking Mac OS X 10.6 and Vista via ethernet?

    - by Moshe
    How can I make Vista home premium access OS X hard drive? and the other way around? I'd like to transfer files via direct ethernet. Plugging in an ethernet cable makes both computers recognize a network, but not the other device. Each firewall is turned off, but no luck. Edit: I don't see Windows Sharing in the Service Column.

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