[Vm-dev] Memory leak in the SqueakSSL plugin on unix

David T. Lewis lewis at mail.msen.com
Wed Oct 23 01:02:09 UTC 2013

On Sun, Oct 20, 2013 at 05:50:20AM +0200, Levente Uzonyi wrote:
> On Sat, 19 Oct 2013, David T. Lewis wrote:
> >
> >Hi Levente,
> >
> >I opened a Mantis issue to make sure this does not get overlooked:
> >
> > http://bugs.squeak.org/view.php?id=7793
> Thanks. I've attached the file with the changes.
> >
> >Do you now have an updated sqUnixOpenSSL.c that fixes the memory leak
> >problem? If so can you please post the file here (or attach it to the 
> >Mantis
> >report)? I understand the changes from your original message but I'm not
> >clear if more work needs to be done related to "the BIO_free_all calls are
> >not needed in general".
> >
> >The sqUnixOpenSSL.c file is identical on trunk and oscog, so we can apply
> >your fix to both branches.
> I made some changes, and it seems like the leakage is gone. I only ran a 
> short test of a few thousand connections, but I didn't experience any
> increase in memory usage with the new code. You can find the modified file 
> here: http://leves.web.elte.hu/squeak/sqUnixOpenSSL.c
> Both the cmake (for the interpreter) and the automake (for Cog) configs 
> will have to be created/updated to be able to build a functional plugin.

Hi Levente,

You mention that the cmake configs for interpreter VM may need to be updated
for SqueakSSL, but when I compile the VM on my Linux PC it seems to be fine.
I actually do not know how to test the SSL plugin, but it seems to be complete
and all of the primitives are present in the module.

  lewis at linux-jh8m:~/squeak/build/SqueakSSL> ls -l
  total 60
  drwxr-xr-x 3 lewis users  4096 2013-10-19 12:45 CMakeFiles
  -rw-r--r-- 1 lewis users  1908 2013-10-19 12:45 cmake_install.cmake
  -rw-rw-rw- 1 lewis users   509 2013-10-19 12:45 CMakeLists.in
  -rw-rw-rw- 1 lewis users   683 2013-10-19 12:45 CMakeLists.txt
  -rw-rw-rw- 1 lewis users    41 2013-10-19 12:45 config.cmake
  -rw-r--r-- 1 lewis users 11126 2013-10-19 12:45 Makefile
  -rwxr-xr-x 1 lewis users 27740 2013-10-19 20:35 so.SqueakSSL
  lewis at linux-jh8m:~/squeak/build/SqueakSSL> size so.SqueakSSL
     text    data     bss     dec     hex filename
    17236    1024      48   18308    4784 so.SqueakSSL
  lewis at linux-jh8m:~/squeak/build/SqueakSSL> nm so.SqueakSSL | grep primitive
  0000000000001bc0 T primitiveAccept
  0000000000001da0 T primitiveConnect
  0000000000001f80 T primitiveCreate
  0000000000002000 T primitiveDecrypt
  00000000000021e0 T primitiveDestroy
  0000000000002280 T primitiveEncrypt
  0000000000002460 T primitiveGetIntProperty
  0000000000002550 T primitiveGetStringProperty
  0000000000002730 T primitiveSetIntProperty
  0000000000002840 T primitiveSetStringProperty

This looks like it should work. Is there an easy way that I can test the
plugin and verify that it is working?


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