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

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Message #5 received at submit@bugs.x2go.org (full text, mbox, reply):

From: Heinrich Schuchardt <xypron.glpk@gmx.de>

To: submit@bugs.x2go.org

Subject: nx-libs: incorrect usage of scanf

Date: Fri, 30 Jan 2015 20:35:53 +0100

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


Best regards

Heinrich Schuchardt

Message #10 received at 777@bugs.x2go.org (full text, mbox, reply):

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

To: Heinrich Schuchardt <xypron.glpk@gmx.de>, 777@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#777: nx-libs: incorrect usage of scanf

Date: Sat, 31 Jan 2015 15:04:21 +0000

[Message part 1 (text/plain, inline)]

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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fon: +49 (1520) 1976 148

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mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

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Message #15 received at 777@bugs.x2go.org (full text, mbox, reply):

From: Heinrich Schuchardt <xypron.glpk@gmx.de>

To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 777@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#777: nx-libs: incorrect usage of scanf

Date: Mon, 02 Feb 2015 21:39:50 +0100

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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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Message #20 received at 777@bugs.x2go.org (full text, mbox, reply):

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

To: Heinrich Schuchardt <xypron.glpk@gmx.de>

Cc: 777@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#777: nx-libs: incorrect usage of scanf

Date: Fri, 15 May 2015 13:11:21 +0000

[Message part 1 (text/plain, inline)]

Control: close -1

Closing (and agreeing on this) by use request.

Mike

On  Mo 02 Feb 2015 21:39:50 CET, Heinrich Schuchardt wrote:

> 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
>>


-- 

DAS-NETZWERKTEAM
mike gabriel, herweg 7, 24357 fleckeby
fon: +49 (1520) 1976 148

GnuPG Key ID 0x25771B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

freeBusy:
https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xfb

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