Wireshark mailing list archives

Re: New packet list - out of memory?


From: Jeff Morriss <jeff.morriss.ws () gmail com>
Date: Thu, 08 Oct 2009 09:58:04 -0400

didier wrote:
But are canaries used at all? In my understanding without
DEBUG_INTENSE_CANARY_CHECKS they are never checked and it's unset by
default.

Erm, emem_free_all() checks that the canaries haven't been corrupted:

 if (memcmp(npc->canary_info->canary[i], canary, npc->canary_info->cmp_len[i]) != 0)
     g_error("Memory corrupted");

I fixed a bug a while ago where a dissector was writing past the end of 
its se_alloc()'d memory:

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1513

I don't think we can/should turn off canaries in se_ allocations. 
Instead we should create a new canary-less allocator.  (Not sure what 
such a thing should be named, of course...)
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