[gnutls-help] Issues with both gnutls 3.3.0 and 3.3.1

Martin Kletzander mkletzan at redhat.com
Mon Apr 28 17:51:07 CEST 2014

On Mon, Apr 28, 2014 at 05:36:27PM +0200, Martin Kletzander wrote:
>On Mon, Apr 28, 2014 at 05:25:13PM +0200, Nikos Mavrogiannopoulos wrote:
>>On Mon, Apr 28, 2014 at 4:49 PM, Martin Kletzander <mkletzan at redhat.com> wrote:
>>>> On a second read, I don't quite understand what is the issue you're having
>>>> there. Is it that you do a fork-then-exec, and you see the urandom
>>>> descriptor
>>>> open? If you simply do a fork that is expected as the child inherits all
>>>> the
>>>> open descriptors.
>>> It happens with usual fork-then-exec on some binaries.  I'm saying
>>> some because I was not able to identify which ones as it doesn't
>>> happen for every one.
>>> I saw this error when running libvirt test suite (make check) where we
>>> have one test checking that we leak no file descriptors into our
>>> executed code (apart from other things).  However, even if I run that
>>> command we are using [1] from shell, it still has these two FDs open.
>>> The program just creates a log file with all its file descriptors,
>>> environment data, etc.
>>> If there's anything I can do to help find the bug, let me know.
>>I could not reproduce it with a program that calls gnutls_global_init() and
>>then forks and execs. Is there a way to reproduce it with libvirt tools?
>The program I was using does not do anything with
>gnutls_global_init().  What I used when bisecting was:
>tests/commandhelper </dev/null &>/dev/null
>grep '^FD:' tests/commandhelper.log
>When everything is ok, you'll see only:
>However with gnutls with that mentioned commit, I see:
>*However*, for this you need to configure libvirt with tests, build
>them (or at least the commandhelper), etc.  I'll try to come up with a
>simplified source code asap.

I simplified it into a simple checker [1], that you just run without
parameters and see the list of open file descriptors.

But what I haven't realized earlier is that it only behaves weird when
compiled with '-lgnutls', not if compiled without that library.  I
guess in that case it is unloaded and the FDs are closed properly.


[1] http://ideone.com/0Nrv0d
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