[lkml]   [2005]   [Mar]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: forkbombing Linux distributions
On 2005/03/22 12:49, Jan Engelhardt <> 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

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


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-04-06 13:30    [W:0.084 / U:0.480 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site