[tor-bugs] #15205 [Tor]: There's something fishy in OSX's checked strlcat.

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#15205: There's something fishy in OSX's checked strlcat.
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     Reporter:  nickm   |      Owner:
         Type:  defect  |     Status:  new
     Priority:  major   |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |
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Comment (by nickm):

 Here is a C file to reproduce the bug:
 {{{
 #include <string.h>

 int main(int argc, char **argv)
 {
  char a[300];
  char b[30];
  char c[300];

  memset(a, 'x', 299);
  a[299] = 0;
  memset(c, 'y', 299);
  c[299] = 0;

  b[0] = 0;
  strlcat(b, a, 300);

  b[0] = 0;
  strlcat(b, c, 300);

  return 0;
 }
 }}}

 Compile it with GCC on OSX 10.10, run it, and you'll get "Abort trap: 6".
 I believe 10.9 will have the same issue.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15205#comment:2>
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