Bug 380605

Summary:	GRSEC blocking chmod during util-linux-2.19.1(-r1) emerge
Product:	Gentoo Linux	Reporter:	Jérémie Horhant <jeremie.horhant>
Component:	Hardened	Assignee:	The Gentoo Linux Hardened Team <hardened>
Status:	RESOLVED INVALID
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	AMD64
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Jérémie Horhant 2011-08-25 09:21:46 UTC

In a hardened environment I'm trying to emerge util-linux but grsec is blocking chmod +s on /var/tmp/portage/sys-apps/util-linux-2.19.1-r1/image//usr/bin/write.

grsec: From ***.***.***.***: denied chmod +s of /var/tmp/portage/sys-apps/util-linux-2.19.1-r1/image/usr/bin/write by /bin/chmod[chmod:12251] uid/euid:0/0 gid/egid:0/0, parent /usr/bin/gmake[make:12249] uid/euid:0/0 gid/egid:0/0

Reproducible: Always

Steps to Reproduce:
1. In a hardened environment
2. Try to emerge util-linux-2.19.1 or util-linux-2.19.1-r1
Actual Results:  
Emerge failed with chmod: changing permissions of `/var/tmp/portage/sys-apps/util-linux-2.19.1-r1/image//usr/bin/write': Permission denied


Expected Results:  
Emerge successfully.

Portage 2.1.10.3 (hardened/linux/amd64/no-multilib, gcc-4.4.5, glibc-2.12.2-r0, 2.6.38-hardened-r6a x86_64)
=================================================================
System uname: Linux-2.6.38-hardened-r6a-x86_64-Intel-R-_Xeon-R-_CPU_E5520_@_2.27GHz-with-gentoo-2.0.3
Timestamp of tree: Thu, 25 Aug 2011 06:45:01 +0000
app-shells/bash:          4.1_p9
dev-lang/python:          2.7.1-r1, 3.1.3-r1
dev-util/pkgconfig:       0.26
sys-apps/baselayout:      2.0.3
sys-apps/openrc:          0.8.3-r1
sys-apps/sandbox:         2.4
sys-devel/autoconf:       2.68
sys-devel/automake:       1.11.1
sys-devel/binutils:       2.21.1
sys-devel/gcc:            4.4.5
sys-devel/gcc-config:     1.4.1-r1
sys-devel/libtool:        2.4-r1
sys-devel/make:           3.82
sys-kernel/linux-headers: 2.6.36.1 (virtual/os-headers)
sys-libs/glibc:           2.12.2
Repositories: gentoo
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe -march=native"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -pipe -march=native"
DISTDIR="/usr/portage/distfiles"
FEATURES="assume-digests binpkg-logs buildpkg distlocks ebuild-locks fixlafiles fixpackages news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch"
FFLAGS=""
GENTOO_MIRRORS="ftp://ftp.free.fr/mirrors/ftp.gentoo.org/"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="fr"
MAKEOPTS="-j5"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY=""
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
USE="acl amd64 berkdb bzip2 cli cracklib crypt cups cxx dri gdbm gpm hardened iconv ipv6 justify mmx modules mudflap ncurses nls nptl nptlonly openmp pam pcre perl pppd python readline session sse sse2 ssl sysfs tcpd threads unicode urandom xorg zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="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 stage tables krita karbon braindump" 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="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="fr" PHP_TARGETS="php5-3" RUBY_TARGETS="ruby18" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga neomagic nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" 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

Comment 1 Anthony Basile gentoo-dev

2011-08-25 13:12:49 UTC

If this is being done in a chroot environment, then you need to turn off CONFIG_GRKERNSEC_CHROOT_CHMOD.  If you have sysctl enabled, you can do that at run time, you don't need to recompile.  The option is at

   /proc/sys/kernel/grsecurity/chroot_deny_chmod

I'm going to close this bug. However, if this is not happening in a chroot, then please reopen it since there may be something else going on.

Comment 2 Jérémie Horhant 2011-08-25 14:27:32 UTC

I'm doing the operation in a lxc container, I think this count as a chroot.

echo 0 > /proc/sys/kernel/grsecurity/chroot_deny_chmod

works very well.

Many thanks for your quick answer and sorry for the noise.