Building hardened kernel on hardened profile, with CONFIG_PAX_SIZE_OVERFLOW enabled makes NFSD4 throw tracebacks like that. [ 89.515751] PAX: size overflow detected in function nfsd_cache_update fs/nfsd/nfscache.c:267 cicus.114_58 min, count: 26 [ 89.515759] Pid: 1206, comm: nfsd Not tainted 3.8.8-hardened #1 [ 89.515762] Call Trace: [ 89.515775] [<ffffffff81129a51>] report_size_overflow+0x24/0x2e [ 89.515784] [<ffffffff8123bbea>] nfsd_cache_update+0xad/0x1cf [ 89.515791] [<ffffffff812341c6>] nfsd_dispatch+0x146/0x159 [ 89.515799] [<ffffffff815fbd62>] svc_process_common+0x290/0x43e [ 89.515807] [<ffffffff814e0f80>] ? skb_release_data+0x117/0x11c [ 89.515813] [<ffffffff81233c39>] ? nfsd_destroy+0x66/0x66 [ 89.515819] [<ffffffff815fc11d>] svc_process+0x107/0x125 [ 89.515825] [<ffffffff81233cfe>] nfsd+0xc5/0x117 [ 89.515832] [<ffffffff810624a3>] kthread+0x88/0x90 [ 89.515839] [<ffffffff81060000>] ? param_attr_show+0x4e/0x6c [ 89.515845] [<ffffffff8106241b>] ? kthread_freezable_should_stop+0x39/0x39 [ 89.515852] [<ffffffff81671bf2>] ret_from_fork+0x72/0xa0 [ 89.515859] [<ffffffff8106241b>] ? kthread_freezable_should_stop+0x39/0x39 For example, following link says, that bug exists even in 3.8.6: https://patchwork.kernel.org/patch/2445311/ Reproducible: Always
Confirming this issue, CCing author of the suggested patch. Unfortunately, this patch did not resolve the issue, nfsd process still segfaults. web ~ # dmesg [ 203.702711] PAX: size overflow detected in function nfsd_cache_update fs/nfsd/nfscache.c:269 cicus.114_63 min, count: 28 [ 203.702719] Pid: 3910, comm: nfsd Not tainted 3.8.6-hardened-WEB #2 [ 203.702721] Call Trace: [ 203.702733] [<ffffffff811133e4>] ? report_size_overflow+0x24/0x30 [ 203.702739] [<ffffffff8122541b>] ? nfsd_cache_update+0x25b/0x290 [ 203.702745] [<ffffffff8121a9ef>] ? nfsd_dispatch+0x13f/0x1c0 [ 203.702750] [<ffffffff815bb317>] ? svc_process+0x477/0x780 [ 203.702754] [<ffffffff8121a387>] ? nfsd+0xb7/0x130 [ 203.702759] [<ffffffff8121a2d0>] ? nfsd_destroy+0x70/0x70 [ 203.702764] [<ffffffff81071413>] ? kthread+0xb3/0xc0 [ 203.702774] [<ffffffff81071360>] ? flush_kthread_worker+0xa0/0xa0 [ 203.702776] [<ffffffff815e9722>] ? ret_from_fork+0x72/0xa0 [ 203.702778] [<ffffffff81071360>] ? flush_kthread_worker+0xa0/0xa0 emerge --info: web ~ # emerge --info Portage 2.1.11.62 (hardened/linux/amd64, gcc-4.6.3, glibc-2.15-r3, 3.8.6-hardened-WEB x86_64) ================================================================= System uname: Linux-3.8.6-hardened-WEB-x86_64-Intel-R-_Pentium-R-_Dual_CPU_E2220_@_2.40GHz-with-gentoo-2.2 KiB Mem: 4010872 total, 3773188 free KiB Swap: 0 total, 0 free Timestamp of tree: Thu, 23 May 2013 20:30:01 +0000 ld GNU ld (GNU Binutils) 2.22 app-shells/bash: 4.2_p45 dev-lang/python: 2.7.3-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: 2.5 sys-devel/autoconf: 2.69 sys-devel/automake: 1.11.6, 1.12.6 sys-devel/binutils: 2.22-r1 sys-devel/gcc: 4.6.3 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4-r1 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.7 (virtual/os-headers) sys-libs/glibc: 2.15-r3 Repositories: gentoo ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--keep-going --jobs=4" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://mirror.yandex.ru/gentoo-distfiles" LANG="ru_RU.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" 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="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="" SYNC="rsync://rsync.dstu.local/gentoo-portage" USE="acl amd64 bzip2 cli cracklib crypt cxx dri gpm hardened iconv ipv6 justify logrotate mmx modules mudflap multilib ncurses nls nptl openmp pam pax_kernel pcre readline session sse sse2 ssl tcpd threads unicode urandom 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" 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="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" APACHE2_MPMS="peruser" 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" GRUB_PLATFORMS="pc" 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" LINGUAS="ru" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7" RUBY_TARGETS="ruby18 ruby19" 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, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
Same problem here. 3.9.4-hardened-r1 works fine for me.
(In reply to Vicente Olivert Riera from comment #2) > Same problem here. 3.9.4-hardened-r1 works fine for me. Yes. Fixed in upstream (?) or, just silently by blueness.
