Derek Lesho : ntoskrnl.exe: Update the tick count in KUSER_SHARED_DATA when accessed.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: c988910caeebfd1415ad4d036964a67078493e46
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=c988910caeebfd1415ad4d036...

Author: Derek Lesho 
Date:   Thu Mar 21 00:23:09 2019 -0400

ntoskrnl.exe: Update the tick count in KUSER_SHARED_DATA when accessed.

EasyAntiCheat.sys constantly reads this value, so I think keeping it
up-to-date is a good idea.

Signed-off-by: Derek Lesho 
Signed-off-by: Alexandre Julliard

---

dlls/ntoskrnl.exe/instr.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/dlls/ntoskrnl.exe/instr.c b/dlls/ntoskrnl.exe/instr.c
index 90a63b0..d5d197d 100644
--- a/dlls/ntoskrnl.exe/instr.c
+++ b/dlls/ntoskrnl.exe/instr.c
@@ -26,6 +26,7 @@

#include <stdarg.h>

+#define NONAMELESSUNION
 #include "windef.h"
 #include "winbase.h"
 #include "winternl.h"
@@ -594,6 +595,15 @@ static void fake_syscall_function(void)
 }

+static void update_shared_data(void)
+{
+    struct _KUSER_SHARED_DATA *shared_data  = (struct _KUSER_SHARED_DATA *)wine_user_shared_data;
+
+    shared_data->u.TickCountQuad = GetTickCount64();
+    shared_data->u.TickCount.High2Time = shared_data->u.TickCount.High1Time;
+}
+
+
 /***********************************************************************
  *           emulate_instruction
  *
@@ -794,6 +804,7 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
             if (offset <= sizeof(KSHARED_USER_DATA) - data_size)
             {
                 ULONGLONG temp = 0;
+                update_shared_data();
                 memcpy( &temp, wine_user_shared_data + offset, data_size );
                 store_reg_word( context, instr[2], (BYTE *)&temp, long_op, rex );
                 context->Rip += prefixlen + len + 2;
@@ -814,6 +825,7 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )

if (offset <= sizeof(KSHARED_USER_DATA) - data_size)
         {
+            update_shared_data();
             switch (*instr)
             {
             case 0x8a: store_reg_byte( context, instr[1], wine_user_shared_data + offset, rex ); break;
@@ -835,6 +847,7 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )

if (offset <= sizeof(KSHARED_USER_DATA) - data_size)
         {
+            update_shared_data();
             memcpy( &context->Rax, wine_user_shared_data + offset, data_size );
             context->Rip += prefixlen + len + 1;
             return ExceptionContinueExecution;