[amunger] 28569: NtQuerySystemInformation: Do not blindly zero the buffer with the size sent in by the caller. This fixes the stack smash "ntdll_winetest info" was seeing. Thanks to arty for catching it. Remove the nested SEH. "ntdll_winetest info" now has 16 failures.

Author: amunger
Date: Sun Aug 26 11:39:29 2007
New Revision: 28569

URL: http://svn.reactos.org/svn/reactos?rev=28569&view=rev
Log:
NtQuerySystemInformation:
Do not blindly zero the buffer with the size sent in by the caller. This fixes the stack
smash "ntdll_winetest info" was seeing. Thanks to arty for catching it.
Remove the nested SEH.
"ntdll_winetest info" now has 16 failures.

Modified:
    trunk/reactos/ntoskrnl/ex/sysinfo.c

Modified: trunk/reactos/ntoskrnl/ex/sysinfo.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ex/sysinfo.c?rev=…
==============================================================================
--- trunk/reactos/ntoskrnl/ex/sysinfo.c (original)
+++ trunk/reactos/ntoskrnl/ex/sysinfo.c Sun Aug 26 11:39:29 2007
@@ -501,6 +501,7 @@
 	{
 		return (STATUS_INFO_LENGTH_MISMATCH);
 	}
+	RtlZeroMemory(Sbi, Size);
 	Sbi->Reserved = 0;
 	Sbi->TimerResolution = KeMaximumIncrement;
 	Sbi->PageSize = PAGE_SIZE;
@@ -722,6 +723,7 @@
 		{
 			_SEH_YIELD(return STATUS_INFO_LENGTH_MISMATCH); // in case buffer size is too small
 		}
+		RtlZeroMemory(Spi, Size);
 
 		syspr = PsGetNextProcess(NULL);
 		pr = syspr;
@@ -1819,9 +1821,6 @@
             ProbeForWriteUlong(UnsafeResultLength);
         }
 
-      /* Clear user buffer. */
-      RtlZeroMemory(SystemInformation, Length);
-
       /*
        * Check the request is valid.
        */
@@ -1842,15 +1841,7 @@
 	    {
               if (PreviousMode != KernelMode)
                 {
-                  _SEH_TRY
-                    {
                       *UnsafeResultLength = ResultLength;
-                    }
-                  _SEH_EXCEPT(_SEH_ExSystemExceptionFilter)
-                    {
-                      FStatus = _SEH_GetExceptionCode();
-                    }
-                  _SEH_END;
                 }
               else
                 {