Messages in this thread | | | Date | Sat, 23 Dec 2006 19:42:10 -0500 | From | John Richard Moser <> | Subject | Re: evading ulimits |
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Jan Engelhardt wrote: >> I've set up some stuff on my box where /etc/security/limits.conf >> contains the following: >> >> @users soft nproc 3072 >> @users hard nproc 4096 >> >> I'm in group users, and a simple fork bomb is easily quashed by this: >> >> bluefox@icebox:~$ :(){ :|:; };: >> bash: fork: Resource temporarily unavailable >> Terminated >> >> Oddly enough, trying this again and again yields the same results; but, >> I can kill the box (eventually; about 1 minute in I managed to `/exec >> killall -9 bash` from x-chat, since I couldn't get a new shell open) >> with the below: > > Note that trying to kill all shells is a race between killing them all first > and them spawning new ones everytime. To stop fork bombs, use killall -STOP > first, then kill them. >
Yes I know; the point, though, is that they should die automatically when the process count hits 4096. They do with the first fork bomb; they keep growing with the second, well past what they should. > > -`J'
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