Re: NT vulnerable to attack on CPU
Fabio Yeon (fay@acpub.duke.edu)
Mon, 23 Dec 96 09:20:21 GMT
In article <96Dec20.083941pst.36078@gateway.fluke.com>, David Bezold <bezold@tc.fluke.com> wrote:
>
>On Thu, 19 Dec 1996, Oskar Pearson wrote:
>
>>
>> > _Old problem _
>> >
>> > Hogging the CPU is one of the oldest known forms of denial of service
>> > attack. So old, in fact, that many operating systems have developed a
>> > defense. Many forms of Unix allow administrators to set limits on CPU
>> > usage by user - limiting any one user to 50 percent of available CPU
>> > cycles, for example.
>> >
>> > Almost all forms of Unix also automatically decrease the priority of
>> > the highest-priority processes when applications become starved for
>> > CPU time, which is the opposite of what Windows NT does.
>> >
>
>Once again bitten by insisting on re-inventing Unix and doing so badly.
>
>-Dave
>
Hum, I wouldn't go there... Last I recall, Linux had the same problem with
this bit of code, spawning processes exponentially until system grinds to a
halt...
main() {
while(1) {
fork();
}
}
Seems to be a problem with many OSs... Is Linux going to address CPU usage
limit?
-- Fabio Yeon
fay@acpub.duke.edu