Bug#611195: vlc-nox: generating plugin cache at postinst segfaults on PaX kernel
Pierre Ynard
linkfanel at yahoo.fr
Wed Jan 26 16:03:23 UTC 2011
Package: vlc-nox
Version: 1.1.3-1squeeze2
Severity: normal
Upgrading gives the following error:
Setting up vlc-nox (1.1.3-1squeeze2) ...
Segmentation fault
dpkg: error processing vlc-nox (--configure):
subprocess installed post-installation script returned error exit status 139
Apparently, vlc-cache-gen segfaults when processing the sdl_image plugin:
stat64("/usr/lib/vlc/plugins/codec/liblpcm_plugin.so", {st_mode=S_IFREG|0644, st_size=9820, ...}) = 0
open("/usr/lib/vlc/plugins/codec/liblpcm_plugin.so", O_RDONLY) = 5
read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\220\6\0\0004\0\0\0"..., 512) = 512
fstat64(5, {st_mode=S_IFREG|0644, st_size=9820, ...}) = 0
mmap2(NULL, 12652, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x4687b000
mmap2(0x4687e000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x2) = 0x4687e000
close(5) = 0
stat64("/usr/lib/vlc/plugins/codec/libsdl_image_plugin.so", {st_mode=S_IFREG|0644, st_size=6852, ...}) = 0
open("/usr/lib/vlc/plugins/codec/libsdl_image_plugin.so", O_RDONLY) = 5
read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240\7\0\0004\0\0\0"..., 512) = 512
fstat64(5, {st_mode=S_IFREG|0644, st_size=6852, ...}) = 0
mmap2(NULL, 9628, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x4747a000
mmap2(0x4747c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x1) = 0x4747c000
close(5) = 0
open("/etc/ld.so.cache", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=50711, ...}) = 0
mmap2(NULL, 50711, PROT_READ, MAP_PRIVATE, 5, 0) = 0x4686e000
close(5) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/usr/lib/libSDL_image-1.2.so.0", O_RDONLY) = 5
read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\320\30\0\0004\0\0\0"..., 512) = 512
fstat64(5, {st_mode=S_IFREG|0644, st_size=47072, ...}) = 0
brk(0x80fe000) = 0x80fe000
mmap2(NULL, 113072, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x46852000
mmap2(0x4685d000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0xb) = 0x4685d000
mmap2(0x4685e000, 63920, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4685e000
close(5) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/usr/lib/libSDL-1.2.so.0", O_RDONLY) = 5
read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0p]\0\0004\0\0\0"..., 512) = 512
fstat64(5, {st_mode=S_IFREG|0644, st_size=421876, ...}) = 0
mmap2(NULL, 720688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x467a2000
mmap2(0x46808000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x65) = 0x46808000
mmap2(0x4680a000, 294704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4680a000
mprotect(0x4946b000, 3840, PROT_READ|PROT_WRITE) = -1 EACCES (Permission denied)
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
zsh: segmentation fault strace -f /usr/lib/vlc/vlc-cache-gen /usr/lib/vlc/plugins
Note the mprotect() error, as logged by the kernel:
[1607219.198034] grsec: denied RWX mprotect of /lib/ld-2.11.2.so by
/usr/lib/vlc/vlc-cache-gen[vlc-cache-gen:15667] uid/euid:0/0 gid/egid:0/0,
parent /var/lib/dpkg/info/vlc-nox.postinst[vlc-nox.postins:15666] uid/euid:0/0 gid/egid:0/0
Disabling the mprotect() restriction feature makes the problem go away.
FWIW, a gdb backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x50f49677 in ?? () from /lib/ld-linux.so.2
(gdb) bt
#0 0x50f49677 in ?? () from /lib/ld-linux.so.2
#1 0x50f4a134 in ?? () from /lib/ld-linux.so.2
#2 0x50f4fe9c in ?? () from /lib/ld-linux.so.2
#3 0x50f507f6 in ?? () from /lib/ld-linux.so.2
#4 0x50f4f192 in ?? () from /lib/ld-linux.so.2
#5 0x50f54b81 in ?? () from /lib/ld-linux.so.2
#6 0x50f507f6 in ?? () from /lib/ld-linux.so.2
#7 0x50f545c6 in ?? () from /lib/ld-linux.so.2
#8 0x50c8ac0b in ?? ()
#9 0x50f507f6 in ?? () from /lib/ld-linux.so.2
#10 0x50c8b09c in ?? ()
#11 0x50c8ab41 in ?? ()
#12 0x50ed0929 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
Feel free to forward the bug appropriately, but:
- Why is the dynamic loader crashing, instead of handling the error
gracefully?
- What's up with libSDL-1.2?
- It sucks that installation and/or start-up of VLC fails because of
one faulty module
-- System Information:
Debian Release: 6.0
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.36.2-grsec
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages vlc-nox depends on:
ii liba52-0.7.4 0.7.4-14 library for decoding ATSC A/52 str
ii libasound2 1.0.23-2.1 shared library for ALSA applicatio
ii libass4 0.9.9-1 library for SSA/ASS subtitles rend
ii libavahi-client3 0.6.27-3 Avahi client library
ii libavahi-common3 0.6.27-3 Avahi common library
ii libavc1394-0 0.5.3-1+b2 control IEEE 1394 audio/video devi
ii libavcodec52 4:0.5.2-6 ffmpeg codec library
ii libavformat52 4:0.5.2-6 ffmpeg file format library
ii libavutil49 4:0.5.2-6 ffmpeg utility library
ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib
ii libcaca0 0.99.beta17-1 colour ASCII art library
ii libcddb2 1.3.2-2 library to access CDDB data - runt
ii libcdio10 0.81-4 library to read and control CD-ROM
ii libdbus-1-3 1.2.24-4 simple interprocess messaging syst
ii libdc1394-22 2.1.2-3 high level programming interface f
ii libdca0 0.0.5-3 decoding library for DTS Coherent
ii libdirac-encoder0 1.0.2-3 open and royalty free high quality
ii libdvbpsi6 0.1.7-1 library for MPEG TS and DVB PSI ta
ii libdvdnav4 4.1.3-7 DVD navigation library
ii libdvdread4 4.1.3-10 library for reading DVDs
ii libebml0 0.7.7-3.1 access library for the EBML format
ii libfaad2 2.7-6 freeware Advanced Audio Decoder -
ii libflac8 1.2.1-3 Free Lossless Audio Codec - runtim
ii libfontconfig1 2.8.0-2.1 generic font configuration library
ii libfreetype6 2.4.2-2.1 FreeType 2 font engine, shared lib
ii libfribidi0 0.19.2-1 Free Implementation of the Unicode
ii libgcc1 1:4.4.5-10 GCC support library
ii libgcrypt11 1.4.5-2 LGPL Crypto library - runtime libr
ii libgnutls26 2.8.6-1 the GNU TLS library - runtime libr
ii libgpg-error0 1.6-1 library for common error values an
ii libkate1 0.3.8-1 Kate is a codec for karaoke and te
ii liblircclient0 0.8.3-5 infra-red remote control support -
ii liblua5.1-0 5.1.4-5 Simple, extensible, embeddable pro
ii libmad0 0.15.1b-5 MPEG audio decoder library
ii libmatroska0 0.8.1-1.1 extensible open standard audio/vid
ii libmodplug1 1:0.8.8.1-2 shared libraries for mod music bas
ii libmpcdec6 2:0.1~r459-1 MusePack decoder - library
ii libmpeg2-4 0.4.1-3 MPEG1 and MPEG2 video decoder libr
ii libmtp8 1.0.3-1 Media Transfer Protocol (MTP) libr
ii libncursesw5 5.7+20100313-5 shared libraries for terminal hand
ii libogg0 1.2.0~dfsg-1 Ogg bitstream library
ii libpng12-0 1.2.44-1 PNG library - runtime
ii libpostproc51 4:0.5.2-6 ffmpeg video postprocessing librar
ii libproxy0 0.3.1-2 automatic proxy configuration mana
ii libraw1394-11 2.0.5-2 library for direct access to IEEE
ii libschroedinger-1.0-0 1.0.9-2 library for encoding/decoding of D
ii libshout3 2.2.2-5+b1 MP3/Ogg Vorbis broadcast streaming
ii libsmbclient 2:3.5.6~dfsg-4 shared library for communication w
ii libspeex1 1.2~rc1-1 The Speex codec runtime library
ii libstdc++6 4.4.5-10 The GNU Standard C++ Library v3
ii libswscale0 4:0.5.2-6 ffmpeg video scaling library
ii libtag1c2a 1.6.3-1 TagLib Audio Meta-Data Library
ii libtheora0 1.1.1+dfsg.1-3 The Theora Video Compression Codec
ii libtwolame0 0.3.12-1 MPEG Audio Layer 2 encoding librar
ii libudev0 164-4 libudev shared library
ii libupnp3 1:1.6.6-5 Portable SDK for UPnP Devices, ver
ii libv4l-0 0.8.1-2 Collection of video4linux support
ii libvcdinfo0 0.7.23-4+b2 library to extract information fro
ii libvlc5 1.1.3-1squeeze2 multimedia player and streamer lib
ii libvlccore4 1.1.3-1squeeze2 base library for VLC and its modul
ii libvorbis0a 1.3.1-1 The Vorbis General Audio Compressi
ii libvorbisenc2 1.3.1-1 The Vorbis General Audio Compressi
ii libxml2 2.7.8.dfsg-2 GNOME XML library
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime
vlc-nox recommends no packages.
vlc-nox suggests no packages.
Versions of packages vlc depends on:
ii libaa1 1.4p5-38 ascii art library
ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib
ii libfreetype6 2.4.2-2.1 FreeType 2 font engine, shared lib
ii libfribidi0 0.19.2-1 Free Implementation of the Unicode
ii libgcc1 1:4.4.5-10 GCC support library
ii libgl1-mesa-glx [libgl1 7.7.1-4 A free implementation of the OpenG
ii libqtcore4 4:4.6.3-4 Qt 4 core module
ii libqtgui4 4:4.6.3-4 Qt 4 GUI module
ii libsdl-image1.2 1.2.10-2+b2 image loading library for Simple D
ii libsdl1.2debian 1.2.14-6.1 Simple DirectMedia Layer
ii libstdc++6 4.4.5-10 The GNU Standard C++ Library v3
ii libtar 1.2.11-6 C library for manipulating tar arc
ii libvlccore4 1.1.3-1squeeze2 base library for VLC and its modul
ii libx11-6 2:1.3.3-4 X11 client-side library
ii libx11-xcb1 2:1.3.3-4 Xlib/XCB interface library
ii libxcb-keysyms1 0.3.6-1 utility libraries for X C Binding
ii libxcb-randr0 1.6-1 X C Binding, randr extension
ii libxcb-shm0 1.6-1 X C Binding, shm extension
ii libxcb-xv0 1.6-1 X C Binding, xv extension
ii libxcb1 1.6-1 X C Binding
ii libxext6 2:1.1.2-1 X11 miscellaneous extension librar
ii ttf-freefont 20090104-7 Freefont Serif, Sans and Mono True
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime
Versions of packages libvlc5 depends on:
ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib
ii libvlccore4 1.1.3-1squeeze2 base library for VLC and its modul
Versions of packages libvlccore4 depends on:
ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib
ii libdbus-1-3 1.2.24-4 simple interprocess messaging syst
ii vlc-data 1.1.3-1squeeze2 Common data for VLC
Versions of packages vlc-nox is related to:
pn libavutil50 <none> (no description available)
pn libavutil51 <none> (no description available)
-- no debconf information
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