[Dovecot] Out of memory

[Wolfram Schlich]

Hi,

this happens since a few days on a Gentoo hardened system using a
grsecurity enabled kernel running Dovecot 1.0.10, only to 2 of 10
users though:

--8<--

kernel: grsec: From 192.168.0.1: denied resource overstep by \
	requesting 537325568 for RLIMIT_AS against limit 536870912 \
	for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \
	gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \
	uid/euid:0/0 gid/egid:0/0

kernel: grsec: From 192.168.0.1: denied resource overstep by \
	requesting 537321472 for RLIMIT_AS against limit 536870912 \
	for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \
	gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \
	uid/euid:0/0 gid/egid:0/0

kernel: grsec: From 192.168.0.1: denied resource overstep by \
	requesting 537456640 for RLIMIT_AS against limit 536870912 \
	for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \
	gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \
	uid/euid:0/0 gid/egid:0/0

kernel: grsec: From 192.168.0.1: denied resource overstep by \
	requesting 537321472 for RLIMIT_AS against limit 536870912 \
	for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \
	gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \
	uid/euid:0/0 gid/egid:0/0

dovecot: IMAP(info): block_alloc(): Out of memory

dovecot: child 15708 (imap) returned error 83 (Out of memory)

--8<--

grsecurity only logs the attempted resource overstep.

I already increased mail_process_size to 512M and deleted the
index.cache* files inside the users maildir -- didn't help :/

Any idea why this is happening or how I could find out?

TIA :)
-- 
Regards,
Wolfram Schlich <wschlich at gentoo.org>
Gentoo Linux * http://dev.gentoo.org/~wschlich/