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Bug#466771: marked as done (busybox cpio: does not unpack hardlinks to empty files)

Your message dated Sun, 12 Apr 2009 14:11:41 +0200
with message-id <20090412121141.GB14690@wavehammer.waldi.eu.org>
and subject line fixed
has caused the Debian Bug report #466771,
regarding busybox cpio: does not unpack hardlinks to empty files
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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466771: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=466771
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
Package: busybox
Version: 1:1.1.3-5
Severity: important

Hash: SHA1

busybox cpio seems to corrupt its memory (maybe with a double free?)
when extracting a hardlink.

Here's a transcript of a simple case to trigger the failure:

0 dkg@ape:/tmp$ mkdir tt
0 dkg@ape:/tmp$ touch tt/x
0 dkg@ape:/tmp$ ln tt/x tt/y
0 dkg@ape:/tmp$ mkdir xx
0 dkg@ape:/tmp$ find tt | cpio -H newc --create | (cd xx && busybox cpio -i)
1 block
1 blocks
cpio: TRAILER!!! not created: cannot resolve hardlink
cpio: (null) not created: cannot resolve hardlink
*** glibc detected *** busybox: double free or corruption (fasttop): 0x08178048 ***
======= Backtrace: =========
======= Memory map: ========
08048000-080ac000 r-xp 00000000 fd:0a 65545      /bin/busybox
080ac000-080ae000 rwxp 00064000 fd:0a 65545      /bin/busybox
080ae000-08199000 rwxp 080ae000 00:00 0          [heap]
b7c00000-b7c21000 rwxp b7c00000 00:00 0 
b7c21000-b7d00000 ---p b7c21000 00:00 0 
b7d6c000-b7d6d000 rwxp b7d6c000 00:00 0 
b7d6d000-b7eb4000 r-xp 00000000 fd:0a 114782     /lib/i686/cmov/libc-2.7.so
b7eb4000-b7eb5000 r-xp 00147000 fd:0a 114782     /lib/i686/cmov/libc-2.7.so
b7eb5000-b7eb7000 rwxp 00148000 fd:0a 114782     /lib/i686/cmov/libc-2.7.so
b7eb7000-b7eba000 rwxp b7eb7000 00:00 0 
b7eba000-b7edd000 r-xp 00000000 fd:0a 114787     /lib/i686/cmov/libm-2.7.so
b7edd000-b7edf000 rwxp 00023000 fd:0a 114787     /lib/i686/cmov/libm-2.7.so
b7edf000-b7ee8000 r-xp 00000000 fd:0a 114784     /lib/i686/cmov/libcrypt-2.7.so
b7ee8000-b7eea000 rwxp 00008000 fd:0a 114784     /lib/i686/cmov/libcrypt-2.7.so
b7eea000-b7f12000 rwxp b7eea000 00:00 0 
b7f1a000-b7f26000 r-xp 00000000 fd:0a 114764     /lib/libgcc_s.so.1
b7f26000-b7f27000 rwxp 0000b000 fd:0a 114764     /lib/libgcc_s.so.1
b7f27000-b7f29000 rwxp b7f27000 00:00 0 
b7f29000-b7f45000 r-xp 00000000 fd:0a 114725     /lib/ld-2.7.so
b7f45000-b7f47000 rwxp 0001b000 fd:0a 114725     /lib/ld-2.7.so
bffb3000-bffc8000 rw-p bffeb000 00:00 0          [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0          [vdso]
134 dkg@ape:/tmp$ 

The standard cpio doesn't seem to have this problem:

0 dkg@ape:/tmp$ rm -rf xx
0 dkg@ape:/tmp$ mkdir xx
0 dkg@ape:/tmp$ find tt | cpio -H newc --create | (cd xx && cpio -i)
1 block
1 block
0 dkg@ape:/tmp$ ls -lR xx
total 0
drwxr-xr-x 2 wt215 wt215 80 2008-02-20 15:26 tt

total 0
- -rw-r--r-- 2 wt215 wt215 0 2008-02-20 15:26 x
- -rw-r--r-- 2 wt215 wt215 0 2008-02-20 15:26 y
0 dkg@ape:/tmp$ 

This seems to happen with -t (list) the same as -i (extract), so i
expect it's a problem with parsing, not file creation.

fwiw, it doesn't seem to be a problem with busybox 1.9.1, as built
with waldi's debian packaging at:


With version 1.9.1, it still doesn't unpack the hardlinks, but it
doesn't double-free, at least:

0 dkg@ape:/tmp$ find tt | cpio -H newc --create | (cd xx && ~/src/busybox/busybox-1.9.1/debian/busybox/bin/busybox cpio -i)
1 block
1 blocks
cpio: tt/x not created: cannot resolve hardlink
cpio: tt/y not created: cannot resolve hardlink
0 dkg@ape:/tmp$ find xx
0 dkg@ape:/tmp$ 

Thanks for maintaining busybox in debian!


- -- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing'), (200, 'unstable'), (101, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.24-1-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages busybox depends on:
ii  libc6                         2.7-6      GNU C Library: Shared libraries

busybox recommends no packages.

- -- no debconf information

Version: GnuPG v1.4.6 (GNU/Linux)


--- End Message ---
--- Begin Message ---
This was fixed some time ago.


Conquest is easy. Control is not.
		-- Kirk, "Mirror, Mirror", stardate unknown

--- End Message ---

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