[Opendnssec-user] C_CloseAllSessions and threads

Fredrik Thulin fredrik at thulin.net
Fri Jan 18 11:19:33 UTC 2013


There are several issues in SoftHSM when using threads and

I'm not a C++ programmer, but I believe the issue is that
C_CloseAllSessions 'delete's sessions although the sessions can be in
use in another thread - causing segmentation faults in the other thread.

The attached patch to the test suite easily demonstrates the problem on
my system. Ubuntu 12.04, SoftHSM rev 6958.

$ gdb --args ./checks -o
Program received signal SIGSEGV, Segmentation fault.
0x000000000040cc54 in C_GenerateRandom (hSession=<optimized out>, 
    pRandomData=0x7fffffffe0b0 "<snip>", 
    ulRandomLen=40) at ../../../src/lib/main.cpp:2756
2756	  session->rng->randomize(pRandomData, ulRandomLen);
(gdb) list
2751	  if(pRandomData == NULL_PTR) {
2752	    DEBUG_MSG("C_GenerateRandom", "pRandomData must not be a
2753	    return CKR_ARGUMENTS_BAD;
2754	  }
2756	  session->rng->randomize(pRandomData, ulRandomLen);
2758	  DEBUG_MSG("C_GenerateRandom", "OK");
2759	  return CKR_OK;
2760	}

So session->rng is now an invalid reference since C_CloseAllSessions did
'delete' on the session from another thread.

I've seen this problem in C_GenerateKeyPair (also due to session->rng)
and in unknown place(s) crashing out in sqlite as well.


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