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Old 03-06-2007, 07:45 PM   #1
cyberfishee
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Registered: Mar 2005
Distribution: Debian Testing
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Is there something like memory and CPU quota?


Hi,
I was wondering, is there any way to stop untrusted local users from running something like:

Code:
while(1) {
     malloc(1);
}
to bring down the whole system? (eg. some sort of memory quota?)

I tried it on my Debian box with a Core 2 Duo E6300 and 1GB ram from an unprivileged user, and it completely crashed my system within seconds if not shorter.

Is there something conceptual that I am missing here? (eg. should untrusted users not be allowed to run any binary? That doesn't seem practical in eg, a school setting)

Thank you very much
Matthew Lai
 
Old 03-06-2007, 11:10 PM   #2
macemoneta
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Registered: Jan 2005
Location: Manalapan, NJ
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The 'ulimit' command (part of the bash shell; man ulimit) or /etc/security/limits.conf (part of pam, man limits.conf) will do the job.
 
Old 03-06-2007, 11:28 PM   #3
cyberfishee
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Registered: Mar 2005
Distribution: Debian Testing
Posts: 133

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wow!
I just looked it up.
It is amazing.

Strange that I have never heard of it, being an alomst 4 years Linux user.

Thank you =)
 
  


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