X2Go Bug report logs - #777
nx-libs: incorrect usage of scanf

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Package: nx-libs; Maintainer for nx-libs is X2Go Developers <x2go-dev@lists.x2go.org>;

Reported by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Date: Fri, 30 Jan 2015 19:40:01 UTC

Severity: normal

Found in version head

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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X-Loop: owner@bugs.x2go.org
Subject: Bug#777: [X2Go-Dev] Bug#777: nx-libs: incorrect usage of scanf
Reply-To: Heinrich Schuchardt <xypron.glpk@gmx.de>, 777@bugs.x2go.org
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Date: Mon, 02 Feb 2015 21:39:50 +0100
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
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To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 777@bugs.x2go.org
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Squeeze reached end of life.
Package libc6 in wheezy is patched against the bug.
Package libc6 in jessie is not vulnerable as it uses a newer libc6
release.

So I think we should close this bug and concentrate on updating our
mesa code to the newest version instead of patching some old version.

Best regards

Heinrich

On 31.01.2015 16:04, Mike Gabriel wrote:
> Hi Heinrich,
> 
> On  Fr 30 Jan 2015 20:35:53 CET, Heinrich Schuchardt wrote:
> 
>> package: nx-libs version: head
>> 
>> In different parts of the nx-libs library you can find usages of
>> scanf like
>> 
>> /* check for MESA_GAMMA environment variable */ gamma =
>> _mesa_getenv("MESA_GAMMA"); if (gamma) { v->RedGamma =
>> v->GreenGamma = v->BlueGamma = 0.0; sscanf( gamma, "%f %f %f",
>> &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
>> 
>> According to cppcheck:
>> 
>> scanf without field width limits can crash with huge input data
>> on libc versions older than 2.13-25. Add a field width specifier
>> to fix this problem: %i => %3i
> 
> Any chance you could also provide a patch for this?
> 
> Mike
> 

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