During installation of app-misc/screen, SetUID is set leading to the following permissions: ls -l $EPREFIX/usr/bin/screen -rws--x--x 1 uname gname 358728 Jul 4 13:46 /.../usr/bin/screen This makes it impossible to use the compiled Gentoo Prefix by other users (except the one that compiled it). It would be advantageous to remove such SetUID in prefix environment. Reproducible: Always Steps to Reproduce: 1. emerge app-misc/screen 2. login as other user [user2] into the system 3. user2, after sourcing $EPREFIX/startprefix, run screen Actual Results: user2 cannot use screen (permission denied to change files in his/her ~/.screen directory) Expected Results: it should be possible to share prefix environment and use screen from that Portage 2.2.01.22097-prefix (prefix/linux/amd64, gcc-4.7.2, unavailable, 2.6.32-358.11.1.el6.centos.plus.x86_64 x86_64) ================================================================= System uname: Linux-2.6.32-358.11.1.el6.centos.plus.x86_64-x86_64-Intel-R-_Xeon-R-_CPU_E5-2630L_0_@_2.00GHz-with-centos-6.4-Final KiB Mem: 65943412 total, 33558824 free KiB Swap: 67108856 total, 67108856 free Timestamp of tree: Thu, 04 Jul 2013 07:36:30 +0000 ld GNU ld (GNU Binutils) 2.23 app-shells/bash: 4.2_p39-r1 dev-lang/python: 2.7.5, 3.3.2 dev-util/cmake: 2.8.11.1 dev-util/pkgconfig: 0.28 sys-devel/autoconf: 2.69 sys-devel/automake: 1.12.4 sys-devel/binutils: 2.23 sys-devel/gcc: 4.7.2-r1 sys-devel/gcc-config: 1.8-r00.1 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.9 (virtual/os-headers) Repositories: gentoo_prefix ioc-science ACCEPT_KEYWORDS="~amd64-linux" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -O2 -pipe -march=native" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-O2 -pipe -O2 -pipe -march=native" DISTDIR="/home/shared-envs/ioc/sysbio/gentoo/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs collision-protect config-protect-if-modified distlocks ebuild-locks fixlafiles force-prefix merge-sync news parallel-fetch preserve-libs protect-owned sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_US.UTF-8" LDFLAGS="-Wl,-O1" MAKEOPTS="-j16" PKGDIR="/home/shared-envs/ioc/sysbio/gentoo/usr/portage/packages" PORTAGE_CONFIGROOT="/home/shared-envs/ioc/sysbio/gentoo/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/home/shared-envs/ioc/sysbio/gentoo/var/tmp" PORTDIR="/home/shared-envs/ioc/sysbio/gentoo/usr/portage" PORTDIR_OVERLAY="/home/shared-envs/ioc/sysbio/gentoo/var/lib/layman/ioc-sysbio" SYNC="rsync://rsync.prefix.freens.org/gentoo-portage-prefix" USE="X amd64 berkdb bzip2 cli cracklib crypt cxx dri fortran gdbm iconv ipv6 mmx modules mudflap ncurses nls nptl openmp pcre prefix readline session sse sse2 ssl tcpd unicode zlib" ABI_X86="64" 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" 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="keyboard mouse 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="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby18" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga 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, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
I think you're looking for the multiuser USE-flag, aren't you?
no, I don't think so. I could be mistaken since I'm new to gentoo prefix, but multiuser seems to be something different (according to description is for sharing seconds between users). I'm looking foot a way to use screen without sharing sessions. so, user1 could run screen as well as user2 without sharing. the catch is that screen in prefix is installed with setuid (even if you don't specify multiuser flag). this setuid makes it run as a process of the user that compiled prefix environment. I would like to run it without setuid in this case since it would allow me to share compiled prefix with others. now I'm not sure whether multiuser flag is set by default. I'll have to try to compile again by specifically disabeling it Marko
I see, the setuid isn't what makes sense for an offset install, I guess. For Prefix, multiuser is enabled by default (can't be disabled). Not sure why it is necessary though. This needs some research.
Ok, I fixed this. You will need USE=multiuser though.
