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Old 19th May 2011, 16:33
Djamu Djamu is offline
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Default saslauthd memory leak > fix

This is an old issue that still isn't resolved on debian & derivates ( others ? )
maybe someone should include it in the howtos.

issue:
saslauthd's memory usage starts to climb handling invalid authentication requests, eventually eating all your server memory ( & swap ).
this is in fact a very serious issue, as it facilitates (D)DOS attacks by someone sending lots of crap auth. requests until the OOM process killer kicks in.


there's an easy workaround by changing /etc/default/saslauthd
Code:
OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd -r"
to
Code:
OPTIONS="-n 0 -c -m /var/spool/postfix/var/run/saslauthd -r"
adding "-n 0" effectively prevents the saslauthd daemon from using thread processes by using forks instead.
( on 1 of my servers it used up 8GB and 16GB swap.... which was freed up instantaneously upon changing the config and invoking /etc/init.d/saslauthd restart )

if anybody has a better solution.. feel free to post



my 5 cents
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Last edited by Djamu; 19th May 2011 at 16:42.
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