gvfsd-archive crashed with SIGSEGV in __archive_check_magic()

[Sune Keller]

Binary package hint: gvfs

Occurred after deleting .tar.gz archive which was mounted and displayed in a Nautilus browser window.

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 8.10
ExecutablePath: /usr/lib/gvfs/gvfsd-archive
Package: gvfs-backends 0.99.6-0ubuntu3
ProcAttrCurrent: unconfined
ProcCmdline: /usr/lib/gvfs/gvfsd-archive file=file:///home/username/Desktop/DarkGlass_Reworked.tar.gz
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games:/opt/thinlinc/bin
 LANG=en_DK.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: gvfs
StacktraceTop:
 __archive_check_magic () from /usr/lib/libarchive.so.2
 archive_read_next_header () from /usr/lib/libarchive.so.2
 ?? ()
 ?? ()
 ?? ()
Title: gvfsd-archive crashed with SIGSEGV in __archive_check_magic()
Uname: Linux 2.6.27-2-generic i686
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev powerdev pulse pulse-rt sambashare scanner tape video

[Apport retracing service (apport)]

StacktraceTop:__archive_check_magic (a=0x9e54180, magic=14594245, state=6, function=0xb7e92b71 "archive_read_next_header")
archive_read_next_header (_a=0x9e54180, entryp=0xb7b52278) at libarchive/archive_read.c:300
do_open_for_read (backend=0x9e40818, job=0x9e530f0, filename=0x9e54470 "/DarkGlass_Reworked/index.desktop")
run (job=0x9e530f0) at gvfsjobopenforread.c:134
g_vfs_job_run (job=0x9e530f0) at gvfsjob.c:198

[Sebastien Bacher (seb128)]

the crash is a libarchive one

[Andreas Henriksson (andreas-fatal)]

This segfault is the internal consistency checker being triggered. The bug is likely in gvfs(d-archive) which probably passes in a corrupt struct archive.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Savvas Radevic (medigeek)]

Can you please check with libarchive 3.x (libarchive-dev / libarchive12) in ubuntu 12.04?

[Sune Keller (sune-keller)]

I can confirm that gvfsd-archive no longer chrashes with libarchive12 3.0.3-6ubuntu1 in Ubuntu precise/12.04.

$ apt-cache policy libarchive12
libarchive12:
  Installed: 3.0.3-6ubuntu1
  Candidate: 3.0.3-6ubuntu1
  Version table:
 *** 3.0.3-6ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

The archive stays mounted and I can stil browse it (i.e. in Nautilus it shows under places and I can navigate its folder structure), but _obviously_ the files cannot be found when trying to read them e.g. when trying to copy a file or reading it in gedit. Unmounting the archive afterwards also goes just fine.

I'm wondering, though, if from a user experience point of view it wouldn't be smarter to either not allow deleting a mounted archive, or to umount it when it is deleted.

tl;dr: Fixed.

[Savvas Radevic (medigeek)]

Thank you for testing! I'll set it as "Fix released" (I'm not sure whether it should be marked as "Invalid"). The suggestion you mentioned is valid, but should be filed upstream: http://libarchive.github.com/ - http://code.google.com/p/libarchive/issues/list (The issue tracker is still at google code)