[PATCH 1/2] ntdll: Optimize NtReadVirtualMemory for in-process reads.

[Piotr Caban]

From: Piotr Caban

---
 dlls/ntdll/unix/virtual.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index 0d88315164a..ef206d58652 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -6025,7 +6025,26 @@ NTSTATUS WINAPI NtReadVirtualMemory( HANDLE process, const void *addr, void *buf
 {
     unsigned int status;

-    if (virtual_check_buffer_for_write( buffer, size ))
+    if (!virtual_check_buffer_for_write( buffer, size ))
+    {
+        status = STATUS_ACCESS_VIOLATION;
+        size = 0;
+    }
+    else if (process == GetCurrentProcess())
+    {
+        __TRY
+        {
+            memmove( buffer, addr, size );
+            status = STATUS_SUCCESS;
+        }
+        __EXCEPT
+        {
+            status = STATUS_PARTIAL_COPY;
+            size = 0;
+        }
+        __ENDTRY
+    }
+    else
     {
         SERVER_START_REQ( read_process_memory )
         {
@@ -6036,11 +6055,6 @@ NTSTATUS WINAPI NtReadVirtualMemory( HANDLE process, const void *addr, void *buf
         }
         SERVER_END_REQ;
     }
-    else
-    {
-        status = STATUS_ACCESS_VIOLATION;
-        size = 0;
-    }
     if (bytes_read) *bytes_read = size;
     return status;
 }