I have found that OpenSSL version 0.9.6g (or earlier) on Windows can cause a problem
that will prevent Window's
Disk Administrator from being able to delete a logical drive from a system that has
several logical drives associated
with a physical drive. By using a tool call Filemon.exe (from
http://www.sysinternals.com/sitemap.shtml) I was
able to isolate the problem to be one in which a registry handle is not closed I was
able to trace this occurance to a line
in RAND_WIN.C. I then added a one line 'fix' after the query which closes the key and
fixes the problem.
In more detail, using symbolic debugging inside of OpenSSL, I found that during the
first call to SSL_accept()
OpenSSL ends up querying the HKEY_PERFORMANCE_DATA Registry key in order to get some
random data.
It turns out that this is one of those Windows oddities whereby you do not need to
explicitly open this key, but you have
to explicity close it or it leaves a handle open that results in this Disk
Administrator problem.
--- Pete Bobco ---
--------------------------------------------------------------------------------------------------------------------------------------------------
[Patch for RAND_WIN.C]
diff -ur \openssl-0.9.6g-orig/crypto/rand/rand_win.c
\openssl-0.9.6g-work/crypto/rand/rand_win.c
--- \openssl-0.9.6g-orig/crypto/rand/rand_win.c Thu Feb 21 05:56
:50 2002
+++ \openssl-0.9.6g-work/crypto/rand/rand_win.c Fri Aug 23 10:48
:20 2002
@@ -286,6 +286,15 @@
*/
RAND_add(&length, sizeof(length), 0);
RAND_add(buf, length, length / 4.0);
+
+ /* Close the Registry Key to allow Windows to cleanup/close the open handle
+ * Note: The 'HKEY_PERFORMANCE_DATA' key is implicitly opened when the
+ * RegQueryValueEx above is done. However, if it is not explicitly
+ * closed, it can cause disk partition manipulation problems.
+ */
+
+ RegCloseKey(HKEY_PERFORMANCE_DATA);
+
}
if (buf)
free(buf);
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