Bug 294119 – sys-apps/rng-tools-2-r2: rngd tries to open non existant /dev/tpm0

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Johannes Hirte 2009-11-22 23:05:22 UTC]

I was wondering why rngd consumes so much CPU time. A short lock into the logs showed me lots of: 

rngd: Unable to open /dev/tpm0: No such file or directory

rngd_tpm_support.patch seems to be broken. Downgrading to sys-apps/rng-tools-2-r1 helped.

Reproducible: Always




emerge --info
Portage 2.2_rc51 (default/linux/amd64/10.0, gcc-4.4.2, glibc-2.11-r0, 2.6.31.6-fglrx x86_64)
=================================================================                           
System uname: Linux-2.6.31.6-fglrx-x86_64-AMD_Opteron-tm-_Processor_252-with-gentoo-2.0.1   
Timestamp of tree: Sun, 22 Nov 2009 21:30:01 +0000                                          
app-shells/bash:     4.0_p35                                                                
dev-java/java-config: 2.1.9-r1                                                              
dev-lang/python:     2.6.4, 3.1.1-r1                                                        
dev-util/cmake:      2.8.0                                                                  
sys-apps/baselayout: 2.0.1                                                                  
sys-apps/openrc:     0.5.2-r2                                                               
sys-apps/sandbox:    2.2                                                                    
sys-devel/autoconf:  2.13, 2.63-r1                                                          
sys-devel/automake:  1.9.6-r2, 1.10.2, 1.11                                                 
sys-devel/binutils:  2.20
sys-devel/gcc-config: 1.4.1
sys-devel/libtool:   2.2.6b
virtual/os-headers:  2.6.30-r1
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=k8-sse3 -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config /var/lib/hsqldb"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/init.d /etc/initng/daemon /etc/initng/net /etc/initng/system /etc/pam.d /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c /etc/udev/rules.d"
CXXFLAGS="-march=k8-sse3 -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--with-bdeps=y"
FEATURES="assume-digests collision-protect distlocks fixpackages metadata-transfer news parallel-fetch protect-owned sandbox sfperms strict unmerge-logs unmerge-orphans userfetch"
GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo"
LANG="C"
LDFLAGS="-Wl,-O1 -Wl,--sort-common -Wl,-z,combreloc"
LINGUAS="de"
MAKEOPTS="-j3"
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="/usr/src/portage"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage/layman/x11 /usr/local/portage/layman/kde-testing /usr/local/portage/layman/qting-edge /usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="3dnow 3dnowext 7zip X a52 aac accessibility acl acpi akonadi alsa amd64 amr amrnb amrwb aspell audiofile authfile avi bash-completion berkdb boost bzip2 bzlib cairo calendar caps cdda cdparanoia cdr chipcard chm cisco cleartype cli consolekit cracklib crypt css cups cvs dbus dirac djvu dlloader dri dts dv dvd dvdr dvdread encode enscript exif exiv2 fastcgi ffmpeg fftw flac fortran gcc-libffi gcj gd gdbm gif gimp git glitz gmp gnuplot gpm graphite graphviz hal hbci htmlhandbook http iconv idl idle ieee1394 imagemagick inotify ipv6 java java5 java6 jikes jpeg kde kdehiddenvisibility kdepim kipi lame lapack latex lcms ldap lensfun libnotify libsamplerate live lm_sensors logrotate lucene lzma lzo mad matroska mjpeg mmap mmx mmxext mng modules mp2 mp3 mp3tunes mp4 mpeg mplayer mtp mudflap multilib musicbrainz ncurses network nfs nls nolvm1 nptl nptlonly nsplugin obex ogg oggvorbis openal openexr opengl openmp optimized-qmake pam patch pcre pdf perl pic plasma png pnm podofo policykit posix postscript pppd profiledbootstrap python python3 pyx qt qt3 qt3support qt4 quicktime readline redeyes redland reflection rss rtc samba samplerate sasl scanner schroedinger sdl semantic-desktop sendfile session silvercity slang smime smp sndfile snmp soundtouch sox speex spell spl sqlite sse sse2 ssl subversion svg sysfs taglib tcpd tetex theora threads thumbnail tiff tk trayicon truetype unicode usb userlocales v4l v4l2 vorbis vorbis-psy webkit x264 xattr xcb xcomposite xext xhtml xine xml xml2 xmp xorg xscreensaver xulrunner xv xvid yv12 zlib zvbi" 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 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" CAMERAS="canon" ELIBC="glibc" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="de" USERLAND="GNU" VIDEO_CARDS="radeon"
Unset:  CPPFLAGS, CTARGET, FFLAGS, INSTALL_MASK, LC_ALL, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

[Comment 1 Krzysztof Pawlik (RETIRED) 2009-11-23 19:05:10 UTC]

I've masked 2-r2 because that's seriously broken behavior: currently it defaults to using TPM. This should be the opposite: default to ignore TPM.

[Comment 2 Johannes Hirte 2009-11-25 00:51:46 UTC]

(In reply to comment #1)
> I've masked 2-r2 because that's seriously broken behavior: currently it
> defaults to using TPM. This should be the opposite: default to ignore TPM.
> 

It's not only the default behavior. I couldn't disable it at all. The --no-tpm option seemed to be completely ignored by rngd.

[Comment 3 Robin Johnson 2010-09-15 08:31:24 UTC]

rng-tools-2-r3 now in the tree with a new spin of the patch.
Sorry about the delay, I had to find time to review the patch well on various systems with hwrng but not TPM.

Please test the new revbump.

[Comment 4 Göktürk Yüksek 2015-12-25 00:06:47 UTC]

This version is not in the tree anymore. In addition to that, the new kernel hw_random interface can use TPM as its backend, so there is no need for explicitly opening /dev/tpm0 now. Feel free to re-open if the problem still exists for you.