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Caiman
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Joined: 01 Jul 2007
Posts: 35

PostPosted: Fri Oct 25, 2013 10:26 am    Post subject: qemu vs grsec [SOLVED] Reply with quote

Hello

attempt to start qemu failed with /var/log/messages
Oct 24 21:45:19 dell2650 kernel: grsec: From 192.168.4.14: denied RWX mmap of <anonymous mapping> by /usr/bin/qemu-system-x86_64[qemu-system-x86:27758] uid/euid:1000/1000 gid/egid:100/100, parent /bin/bash[bash:27747] uid/euid:1000/1000 gid/egid:100/100

What changes on grsec should be done to allow qemu to start ?

emerge --info
Portage 2.2.1 (hardened/linux/x86, gcc-4.7.3, glibc-2.15-r3, 3.11.2-hardened i686)
=================================================================
System uname: Linux-3.11.2-hardened-i686-Intel-R-_Xeon-TM-_CPU_3.20GHz-with-gentoo-2.2
KiB Mem: 3113168 total, 1808312 free
KiB Swap: 6291452 total, 6291452 free
Timestamp of tree: Fri, 25 Oct 2013 00:15:01 +0000
ld GNU ld (GNU Binutils) 2.23.1
app-shells/bash: 4.2_p45
dev-lang/python: 2.7.5-r3, 3.2.5-r3
dev-util/cmake: 2.8.10.2-r2
dev-util/pkgconfig: 0.28
sys-apps/baselayout: 2.2
sys-apps/openrc: 0.11.8
sys-apps/sandbox: 2.6-r1
sys-devel/autoconf: 2.69
sys-devel/automake: 1.13.4
sys-devel/binutils: 2.23.1
sys-devel/gcc: 4.7.3-r1
sys-devel/gcc-config: 1.7.3
sys-devel/libtool: 2.4.2
sys-devel/make: 3.82-r4
sys-kernel/linux-headers: 3.9 (virtual/os-headers)
sys-libs/glibc: 2.15-r3
Repositories: gentoo
ACCEPT_KEYWORDS="x86"
ACCEPT_LICENSE="* -@EULA"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=i686 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -march=i686 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-march=i686 -O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-march=i686 -O2 -pipe"
GENTOO_MIRRORS="ftp://gentoo.arcticnetwork.ca/pub/gentoo/ http://gentoo.arcticnetwork.ca/"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY=""
SYNC="rsync://rsync.ca.gentoo.org/gentoo-portage"
USE="X acl berkdb bindist bzip2 caps cli cracklib crypt curl cxx device-mapper dri gdbm gtk3 gudev hardened hwdb iconv ipv6 iscsi jpeg modules mudflap ncurses nptl opengl openmp pam pax_kernel pcre pic python qemu readline session spice ssl tcpd tls udev unicode urandom vde virt-network x86 zlib" ABI_X86="32" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" QEMU_SOFTMMU_TARGETS="x86_64 i386" QEMU_USER_TARGETS="x86_64 i386" RUBY_TARGETS="ruby19 ruby18" USERLAND="GNU" VIDEO_CARDS="radeon" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON

Thanks in advance,
Caiman.


Last edited by Caiman on Sat Oct 26, 2013 10:55 pm; edited 1 time in total
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Caiman
n00b
n00b


Joined: 01 Jul 2007
Posts: 35

PostPosted: Sat Oct 26, 2013 10:55 pm    Post subject: Reply with quote

working now.Stepsa I did :

#was
grep CONFIG_PAX_MPROTECT/etc/kernels/kernel-config-x86-3.11.2-hardened
CONFIG_PAX_MPROTECT=y
# CONFIG_PAX_MPROTECT_COMPAT is not set

#changed to
grep CONFIG_PAX_MPROTECT/etc/kernels/kernel-config-x86-3.11.2-hardened
CONFIG_PAX_MPROTECT=y
CONFIG_PAX_MPROTECT_COMPAT=y


#then another error during qemu start

Oct 26 12:00:05 dell2650 kernel: grsec: From 192.168.4.14: denied resource overstep by requesting 4096 for RLIMIT_CORE against limit 0 for /usr/bin/qemu-system-i386[qemu-system-i38:13341] uid/euid:1000/1000 gid/egid:100/100, parent /bin/bash[bash:12354] uid/euid:1000/1000 gid/egid:100/100

#solved by :


#set to default
paxctl -z /usr/bin/qemu-system-i386

#-m: disable MPROTECT
paxctl -m /usr/bin/qemu-system-i386

#s: disable SEGMEXEC
paxctl -s /usr/bin/qemu-system-i386

#working settings
dell2650 ~ # paxctl -v /usr/bin/qemu-system-i386
PaX control v0.7
Copyright 2004,2005,2006,2007,2009,2010,2011,2012 PaX Team <pageexec@freemail.hu>

- PaX flags: ---s-m-x---- [/usr/bin/qemu-system-i386]
SEGMEXEC is disabled
MPROTECT is disabled
RANDEXEC is disabled

# qemu started without any problems

not sure if this proper procedure ,or workaround.
If any idea , please let me know.

Thanks,
Konstantin.
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