Messages in this thread | | | Date | Wed, 23 Mar 2005 14:53:17 +0100 | From | Max Kellermann <> | Subject | Re: forkbombing Linux distributions |
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On 2005/03/22 12:49, Jan Engelhardt <jengelh@linux01.gwdg.de> wrote: > What if the few procs that he may spawn also grab so much memory so > your machine disappears in swap-t(h)rashing?
The number of processes is counted per user, but CPU time and memory consumption is counted per process.
Going around RLIMIT_CPU is too easy by simply forkbombing. This renders RLIMIT_CPU unusable.
The memory limits aren't good enough either: if you set them low enough that memory-forkbombs are unperilous for RLIMIT_NPROC*RLIMIT_DATA, it's probably too low for serious applications.
Now what about per-user (or per-session) CPU and memory limits?
Another idea: RLIMIT_FORK (number of allowed fork() calls in that session). While that may not be useful for interactive login sessions, I can imagine several situations where it could help (like qmail child processes).
Max
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