lkml.org 
[lkml]   [2007]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Fork Bombing Attack
    On 5/18/07, Anand Jahagirdar <anandjigar@gmail.com> wrote:
    > Hello All
    > I tried to execute a program which creates 8152 process.(
    > i=0; while( i<14) i++ fork(); ) with ulimit 8200. This program
    > created 8152 processes and then stopped and came back to command
    > prompt. this proves that my machine do have sufficient resources to
    > create 8000 processes.
    >
    > I found one more interesting thing on the same machine
    > having FC6 distribution and Linux Kernel 2.6.18. i have set "ulimit -u
    > 100". after setting this limit i tried to execute fork bombing program
    > with guest account. after executing it
    >
    > expected result:- guest uesr should not able to fork another single
    > process when it reaches to 100 processes count.
    >
    > actual result :- kernel allow me to create another processes without
    > giving error. due to this i tried to execute same fork bombing program
    > on another terminal with guest account and this fork bombing attack
    > killed the box completely and machine needed reboot.
    >

    I think if you want resource limiting per _UID_ (and not per _process_
    as you did), you should use PAM module pam_limits.so. You can edit
    those limits using the file /etc/security/limits.conf

    Regards,
    --
    Ahmed S. Darwish
    http://darwish-07.blogspot.com
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-05-18 15:23    [W:0.032 / U:1.256 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site