brcupsconfpt1 assert failure: *** buffer overflow detected ***: /usr/Brother/Printer/dcp560cn/cupswrapper/brcupsconfpt1 terminated

Bug #423817 reported by Winfried Hofer on 2009-09-03
894
This bug affects 113 people
Affects Status Importance Assigned to Milestone
brother-cups-wrapper-common (Ubuntu)
High
Unassigned
Nominated for Lucid by siGGismallz
Precise
High
Unassigned

Bug Description

Binary package hint: brother-cups-wrapper-common

Network-Printer does't work due to error

ProblemType: Crash
Architecture: i386
AssertionMessage: *** buffer overflow detected ***: /usr/Brother/Printer/dcp560cn/cupswrapper/brcupsconfpt1 terminated
Date: Thu Sep 3 11:06:50 2009
Dependencies:
 brother-lpr-drivers-common 1.0.0-4-0ubuntu1
 findutils 4.4.2-1
 gcc-4.4-base 4.4.1-3ubuntu3
 libc6 2.10.1-0ubuntu8
 libgcc1 1:4.4.1-3ubuntu3
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/Brother/Printer/brcupsconfpt1
Package: brother-cups-wrapper-common 1.0.0-10-0ubuntu5
ProcCmdline: /usr/Brother/Printer/dcp560cn/cupswrapper/brcupsconfpt1 DCP560CN /etc/cups/ppd/Brother-DCP-560CN.ppd 0 media=A4\ job-uuid=urn:uuid:5544d5f9-9288-3240-6c7f-b67ad500144b\ page-bottom=15\ page-left=15\ page-right=10\ page-top=20\ job-originating-host-name=localhost\ Copies=1 dcp560cn
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-9.29-generic
Signal: 6
SourcePackage: brother-cups-wrapper-common
StacktraceTop:
 __kernel_vsyscall ()
 raise () from /lib/tls/i686/cmov/libc.so.6
 abort () from /lib/tls/i686/cmov/libc.so.6
 ?? () from /lib/tls/i686/cmov/libc.so.6
 __fortify_fail () from /lib/tls/i686/cmov/libc.so.6
Title: brcupsconfpt1 assert failure: *** buffer overflow detected ***: /usr/Brother/Printer/dcp560cn/cupswrapper/brcupsconfpt1 terminated
Uname: Linux 2.6.31-9-generic i686
UserGroups:

Winfried Hofer (winfried-hofer) wrote :

StacktraceTop:__kernel_vsyscall ()
*__GI_raise (sig=6)
*__GI_abort () at abort.c:92
__libc_message (do_abort=2,
*__GI___fortify_fail (

Changed in brother-cups-wrapper-common (Ubuntu):
importance: Undecided → Medium
tags: removed: need-i386-retrace
visibility: private → public
Changed in brother-cups-wrapper-common (Ubuntu):
status: New → Confirmed
Chris Parker (mrcsparker) wrote :

The problem here is that the /usr/Brother/Printer/mfc440cn/cupswrapper/brcupsconfpt1 file is returning a

*** stack smashing detected ***

error. There is a buffer overrun in the char media_command variable in the brcupsconfig.c file. A quick (and rather bad) fix is to make the array larger.

I changed the

char media_command[100];

to

char media_command[200];

and the driver works. I have attached my version of the file (I enabled debugging and added more debugging). Just change the line in the Ubuntu version of the file and it works. Ignore all of my excess debug statements.

JeffreyD (jeffrey-vantassel) wrote :

Shows my Brother MFC-255CW in the green and checked as default under System/Administration/Printing yet crashes occur. Unable to print at all. Thank you guys for your time and attention. Cheers, Jeff Van Tassel

Changed in brother-cups-wrapper-common (Ubuntu):
status: Confirmed → Triaged
importance: Medium → High
tags: added: rls-mgr-p-tracking
Till Kamppeter (till-kamppeter) wrote :

The package brother-cups-wrapper-common (in Universe) and all other brother-... packages are not maintained any more. We should consider removing them.

The crash is most probably in closed-source code from Brother and probably fixed in their current driver version on their web site.

Changed in brother-cups-wrapper-common (Ubuntu Precise):
status: Triaged → Won't Fix
tags: removed: rls-mgr-p-tracking
Nick Breen (nick-foobar) wrote :

I've removed the repo's brother packaged and used Brother's installer script (http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/faq_prn.html#f00104).

I no longer get the crash reported.

tags: added: precise
Chris Parker (mrcsparker) wrote :

This crash is NOT due to any proprietary code, or binary blob. There is a really simple fix for it (that I posted way back in 2010-04-06).

Look at comment #4. My fix isn't great, btw. You could still get a buffer overflow. The correct solution would be to check the size of the exec string before loading it to make sure that it is not longer than the size of the media_command array.

Charbonnier (charboma38) wrote :

Corection from #4 solves the problem.
I put 1000 because 200 was not sufficient for me.

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