When I use pam_usb in /etc/system.auth, xscreensaver segfault whens I unlock the display. Reproducible: Always Steps to Reproduce: 1. Add pam_usb to /etc/pam.d/system.auth 2. activate xscreensaver 3. move the mouse, press a key or whatever Actual Results: xscreensaver segfaults Expected Results: xscreensaver keeps running This does not happen without pam_usb. Login aso. works perfectly with pam_usb
This only happens when the usb_stick is inserted. If not, xscreensavers password dialog appears.
Not here; reopen with emerge -pv xscreensaver and emerge --info output and a backtrace attached... http://www.gentoo.org/proj/en/qa/backtraces.xml
emerge -pv pam as well might be useful. Follow http://www.gentoo.org/proj/en/qa/backtraces.xml if you need to.
emerge --info Portage 2.1.2.7 (default-linux/x86/2006.1/desktop, gcc-4.1.2, glibc-2.5-r3, 2.6.21-gentoo-r2 i686) ================================================================= System uname: 2.6.21-gentoo-r2 i686 Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz Gentoo Base System release 1.12.9 Timestamp of tree: Fri, 01 Jun 2007 11:50:01 +0000 dev-java/java-config: 1.3.7, 2.0.32 dev-lang/python: 2.4.4-r4 dev-python/pycrypto: 2.0.1-r5 sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.61 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10 sys-devel/binutils: 2.16.1-r3 sys-devel/gcc-config: 1.3.16 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.21 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=pentium3 -pipe" CHOST="i686-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" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/php/apache2-php5/ext-active/ /etc/php/cgi-php5/ext-active/ /etc/php/cli-php5/ext-active/ /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c" CXXFLAGS="-O2 -march=pentium3 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="distlocks metadata-transfer sandbox sfperms strict" GENTOO_MIRRORS="http://85.25.128.62 ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo ftp://ftp.uni-erlangen.de/pub/mirrors/gentoo ftp://ftp.gentoo.mesh-solutions.com/gentoo/ http://212.219.56.133/sites/www.ibiblio.org/gentoo/" LANG="de_DE.UTF-8" LINGUAS="de ru fr en" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --filter=H_**/files/digest-*" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage" USE="X Xaw3d acpi alsa apache2 arts bash-completion berkdb bitmap-fonts bluetooth branding bzip2 cairo cddb cdparanoia cdr cli cracklib crypt cups curl dbus dga dri dts dv dvd dvdr dvdread eds emacs emboss encode esd evolution exif fam fame ffmpeg fftw firefox flac fontconfig fortran freetype gdbm gif gimp gnome gphoto2 gpm gstreamer gtk gtkhtml hal iconv imagemagick imlib ipv6 irda isdnlog jack java jpeg jpeg2k kde kerberos lame latex lcms ldap libg++ libnotify live logrotate lua lzo mad midi mikmod mjpeg mmx mmxext mng mp3 mpeg mudflap musepack music musicbrainz mysql ncurses network nfs nls nptl nptlonly nsplugin objc odbc offensive ogg openal openexr opengl openmp oss pam pcre pdf perl png portaudio povray ppds pppd python qt3 qt3support qt4 quicktime readline real reflection rtc samba scanner sdl session sms sndfile sound speex spell spl sse sse2 ssl svg tcpd tetex theora tiff truetype truetype-fonts type1-fonts unicode usb utempter v4l v4l2 vcd vidix vorbis win32codecs wmf x86 xanim xinerama xinetd xml xorg xpm xprint xscreensaver xv xvid xvmc zlib" 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" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi null plug rate route share shm softvol" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="de ru fr en" USERLAND="GNU" VIDEO_CARDS="fglrx" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LDFLAGS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
emerge -pv xscreensaver These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R ] x11-misc/xscreensaver-5.02 USE="gnome insecure-savers jpeg offensive opengl pam xinerama -new-login" 0 kB Total: 1 package (1 reinstall), Size of downloads: 0 kB
emerge -pv pam These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R ] sys-libs/pam-0.78-r5 USE="berkdb -nis -pam_chroot -pam_console -pam_timestamp -pwdb (-selinux)" 6,347 kB Total: 1 package (1 reinstall), Size of downloads: 6,347 kB
We really need the backtrace; attach it please.
gdb backtrace: Core was generated by `xscreensaver'. Program terminated with signal 11, Segmentation fault. #0 0xb7f89410 in __kernel_vsyscall () Thread 1 (process 27579): #0 0xb7f89410 in __kernel_vsyscall () No symbol table info available. #1 0xb7c91a26 in kill () from /lib/libc.so.6 No symbol table info available. #2 0x080537d9 in restore_real_vroot_handler (sig=11) at windows.c:728 si = (saver_info *) 0x6bbb #3 <signal handler called> No symbol table info available. #4 auth_finished_cb (si=0xbf9f38b4) at lock.c:1251 No locals. #5 0x08064975 in xss_authenticate (si=0xbf9f38b4, verbose_p=0) at passwd.c:235 i = 0 j = 1 #6 0x0805f9c1 in unlock_p (si=0xbf9f38b4) at lock.c:2089 p = (saver_preferences *) 0xbf9f38b8 #7 0x0804ea29 in main (argc=134737968, argv=0xbf9f3c44) at xscreensaver.c:1312 fd0 = <value optimized out> fd1 = <value optimized out> fd2 = <value optimized out> shell = <value optimized out> the_si = {version = 0x807f030 "5.02", prefs = {db = 0x8089998, init_file_date = 1180690580, verbose_p = 0, timestamp_p = 1, capture_stderr_p = 0, ignore_uninstalled_p = 0, debug_p = 0, xsync_p = 0, lock_p = 1, fade_p = 1, unfade_p = 1, fade_seconds = 3000, fade_ticks = 20, splash_p = 0, install_cmap_p = 1, screenhacks = 0x808f358, screenhacks_count = 269, mode = ONE_HACK, selected_hack = 241, nice_inferior = 10, inferior_memory_limit = 0, initial_delay = 0, splash_duration = 5000, timeout = 300000, lock_timeout = 600000, cycle = 600000, passwd_timeout = 30000, pointer_timeout = 5000, notice_events_timeout = 30000, watchdog_timeout = 57000, pointer_hysteresis = 10, dpms_enabled_p = 0, dpms_standby = 7200000, dpms_suspend = 7800000, dpms_off = 8400000, grab_desktop_p = 0, grab_video_p = 0, random_image_p = 1, image_directory = 0x808f1b8 "/home/olaf/privat/bilder/screensaver", tmode = TEXT_URL, text_literal = 0x808e8c8 "Gentoo Linux", text_file = 0x808e8e0 "/etc/gentoo-release", text_program = 0x808e900 "/usr/bin/fortune", text_url = 0x808ea30 "http://www.spiegel.de/schlagzeilen/rss/index.xml", use_xidle_extension = 1, use_mit_saver_extension = 0, use_sgi_saver_extension = 1, use_proc_interrupts = 1, getviewport_full_of_lies_p = 0, shell = 0x8089988 "/bin/sh", demo_command = 0x808e918 "xscreensaver-demo", prefs_command = 0x808e930 "xscreensaver-demo -prefs", help_url = 0x808e950 "http://www.jwz.org/xscreensaver/man.html", load_url_command = 0x808e980 "gnome-open '%s'", new_login_command = 0x0}, nscreens = 1, screens = 0x8091368, default_screen = 0x8091368, app = 0x80840d8, dpy = 0x8084b68, xinerama_p = 0, using_xidle_extension = 0, using_mit_saver_extension = 0, using_sgi_saver_extension = 0, using_proc_interrupts = 1, randr_event_number = 115, randr_error_number = 184, screen_blanked_p = 1, mouse_grab_window = 121, keyboard_grab_window = 121, mouse_grab_screen = 0, keyboard_grab_screen = 0, fading_possible_p = 1, throttled_p = 0, blank_time = 1180940721, locked_p = 1, dbox_up_p = 1, locking_disabled_p = 0, nolock_reason = 0x0, orig_uid = 0x80816c8 "olaf/olaf (1001/1001)", uid_message = 0x0, dangerous_uid_p = 0, passwd_dialog = 0, pw_data = 0x0, unlock_failures = 0, unlock_typeahead = 0x0, user = 0x8081868 "olaf", cached_passwd = 0x0, unlock_state = ul_success, unlock_cb = 0x8063c90 <gui_auth_conv>, auth_finished_cb = 0x8063300 <auth_finished_cb>, demoing_p = 0, splash_dialog = 0, sp_data = 0x0, lock_id = 0, cycle_id = 134835672, timer_id = 0, watchdog_id = 134835640, check_pointer_timer_id = 0, de_race_id = 0, de_race_ticks = 0, last_activity_time = 1180940716, last_wall_clock_time = 0, last_activity_screen = 0x8091368, emergency_lock_p = 0, selection_mode = 0, stderr_popup_timer = 0} spasswd = <value optimized out> i = <value optimized out>
Reopen.
Confirmed. Packages: --------- [ebuild R ] sys-libs/pam-0.99.7.1 USE="nls vim-syntax (-selinux)" [ebuild R ] x11-misc/xscreensaver-5.02-r1 USE="gnome insecure-savers jpeg offensive opengl pam xinerama -new-login" [ebuild R ] sys-auth/pam_usb-0.4.1 GDB Backtrace of xscreensaver: ------------------------------ Program received signal SIGSEGV, Segmentation fault. auth_finished_cb (si=0xafc642a0) at lock.c:1251 1251 lock.c: No such file or directory. in lock.c (gdb) bt #0 auth_finished_cb (si=0xafc642a0) at lock.c:1251 #1 0x0806a2c7 in xss_authenticate (si=0xafc642a0, verbose_p=0) at passwd.c:235 #2 0x0806451f in unlock_p (si=0xafc642a0) at lock.c:2089 #3 0x0804f85e in main (argc=Cannot access memory at address 0x1 ) at xscreensaver.c:1312 #4 0x494f486f in __libc_start_main () from /lib/libc.so.6 Emerge --info: -------------- Portage 2.1.2.9 (default-linux/x86/2006.1, gcc-4.1.2, glibc-2.5-r3, 2.6.21-ck2 i686) ================================================================= System uname: 2.6.21-ck2 i686 AMD Sempron(tm) Processor 3100+ Gentoo Base System release 1.12.10 Timestamp of tree: Sat, 02 Jun 2007 02:50:01 +0000 distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632) [enabled] ccache version 2.4 [enabled] dev-java/java-config: 1.3.7, 2.0.33-r1 dev-lang/python: 2.4.4-r4 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: 2.4-r7 sys-apps/sandbox: 1.2.18.1 sys-devel/autoconf: 2.13, 2.61 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10 sys-devel/binutils: 2.17 sys-devel/gcc-config: 1.3.16 sys-devel/libtool: 1.5.23b virtual/os-headers: 2.6.21 ACCEPT_KEYWORDS="x86 ~x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-march=athlon-xp -O3 -pipe -g -ftracer" CHOST="i686-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" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/revdep-rebuild /etc/splash /etc/terminfo /etc/texmf/web2c" CXXFLAGS="-march=athlon-xp -O3 -pipe -g -ftracer -fvisibility-inlines-hidden" DISTDIR="/var/tmp/portage/distfiles" EMERGE_DEFAULT_OPTS="" FEATURES="ccache distcc distlocks installsources metadata-transfer noinfo sandbox sfperms splitdebug strict userfetch userpriv usersandbox" GENTOO_MIRRORS="http://gentoo.chem.wisc.edu/gentoo/ http://mirror.datapipe.net/gentoo http://gentoo.mirrors.tds.net/gentoo http://www.mirrorservice.org/sites/www.ibiblio.org/gentoo/ http://adelie.polymtl.ca/ ftp://gentoo.inode.at/source/ http://gentoo.osuosl.org/distfiles/" LANG="en_CA.UTF-8" LC_ALL="en_CA.UTF-8" LDFLAGS="-Wl,-O1" LINGUAS="en_CA en_GB en en_US nl_BE nl nl_NL" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --filter=H_**/files/digest-*" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/portage/local/layman/xeffects /usr/local/portage" SYNC="rsync://rsync.namerica.gentoo.org/gentoo-portage" USE="3dnow 3dnowex 3dnowext X a52 aac aalib acl acpi alsa amr ao asf bash-completion berkdb bitmap-fonts bzip2 cairo caps clamav cli cracklib crypt cscope cups curl dbus directfb divx doc dri dvd dvdread esd fam fbcon ffmpeg fortran gdbm gif glitz glut gmp gnome gnutls gphoto2 gpm gstreamer gtk gtk2 hal iconv ieee1394 imagemagick imlib ipv6 isdnlog java jpeg kde kdeenablefinal kdehiddenvisibility kerberos libcaca libg++ lm_sensors mad midi mikmod mmx mmx2 mmxext mng mp3 mp4 mpeg mudflap ncurses newspr nls no-old-linux nptl nptlonly nsplugin offensive ogg opengl openmp pam pcre pdf perl pertty pic png ppds pppd python qt-copy qt3 qt4 quicktime readline real reflection rtc samba sasl sdl session skey slang speex spell spl sqlite sqlite3 sse sse2 ssl svg sysfs tcpd tga threads tiff timidity truetype truetype-fonts type1-fonts unicode urandom utempter vim vim-syntax vorbis win32codecs x86 xcb xcomposite xinerama xml xorg xosd xpm xprint xrandr xscreensaver xv xvid xvmc zlib" ALSA_CARDS="intel8x0" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi null plug rate route share shm softvol" ELIBC="glibc" INPUT_DEVICES="linux keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en_CA en_GB en en_US nl_BE nl nl_NL" USERLAND="GNU" VIDEO_CARDS="vesa fbdev nvidia nv" Unset: CTARGET, INSTALL_MASK, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
Please post the relevant part of your /var/log/auth.log
Jun 5 15:29:03 [pam_usb] pam_usb v0.4.1_ Jun 5 15:29:03 [pam_usb] Authentication request for user "olaf" (xscreensaver)_ Jun 5 15:29:03 [pam_usb] Device "cruzer-titanium" is connected (good)._ Jun 5 15:29:03 [pam_usb] Access granted._
The problem is that xscreensaver checks if it's okay to unblank the screen in its mainloop (which runs everytime an event occurs, such as a mouse movement, key press, etc). If the authentication goes through, xscreensaver assumes it's because the user entered a correct password into the password dialog and calls destroy_passwd_window() to destroy the window. As there was no password dialog, destroy_passwd_window() attempts to deference a NULL pointer (pw_data), hence the segfault. I will join a patch right away to fix the issue. I think it should be forwarded upstream as the problem is not pam_usb related, it will happen with any PAM module not requiring user interaction.
Created attachment 121281 [details, diff] xscreensaver segfault fix
Thanks Andrea. Has anyone else tested attached patch yet? Please do.
Patch fixes problems, confirmed.
Committed it as xscreensaver-5.02-r2 and mailed it to upstream.
