From: Thomas Faber <thomas.faber@reactos.org>
Date: Mon, 10 Oct 2011 00:17:02 +0000 (+0000)
Subject: [ADVAPI32]
X-Git-Tag: backups/iut-netsh@54410~318
X-Git-Url: https://git.reactos.org/?p=reactos.git;a=commitdiff_plain;h=24e4f7e73de9be8004620603e9bd97b4b2ffc0e2;hp=d38c1a938af37fc7d99dc5a4f2b32e94a04cec9a

[ADVAPI32]
- Hackfix RtlGenRandom to be slightly less dependent on the current time, while staying very un-random.
- Should fix services problems (no joke) due to non-unique RPC UUIDs
See issue #6542 for more details.

svn path=/trunk/; revision=54069
---

diff --git a/reactos/dll/win32/advapi32/misc/sysfunc.c b/reactos/dll/win32/advapi32/misc/sysfunc.c
index 1512d38dc29..97d4ad24403 100644
--- a/reactos/dll/win32/advapi32/misc/sysfunc.c
+++ b/reactos/dll/win32/advapi32/misc/sysfunc.c
@@ -576,6 +576,8 @@ SystemFunction036(PVOID pbBuffer, ULONG dwLen)
     DWORD dwSeed;
     PBYTE pBuffer;
     ULONG uPseudoRandom;
+    LARGE_INTEGER time;
+    static ULONG uCounter = 17;
 
     if(!pbBuffer || !dwLen)
     {
@@ -583,8 +585,9 @@ SystemFunction036(PVOID pbBuffer, ULONG dwLen)
         return TRUE;
     }
 
-    /* Get the first seed from the tick count */
-    dwSeed = GetTickCount();
+    /* Get the first seed from the performance counter */
+    QueryPerformanceCounter(&time);
+    dwSeed = time.LowPart ^ time.HighPart ^ RtlUlongByteSwap(uCounter++);
 
     /* We will access the buffer bytewise */
     pBuffer = (PBYTE)pbBuffer;