From 734a043b22d56d0eee89f546de39a632360619f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= <hpoussin@reactos.org>
Date: Sun, 22 Sep 2024 21:42:21 +0200
Subject: [PATCH] [NTOS:EX] Implement NtSystemDebugControl:
 SysDbgGetPrintBufferSize

---
 ntoskrnl/ex/dbgctrl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ntoskrnl/ex/dbgctrl.c b/ntoskrnl/ex/dbgctrl.c
index 1948164397f..0091af90f23 100644
--- a/ntoskrnl/ex/dbgctrl.c
+++ b/ntoskrnl/ex/dbgctrl.c
@@ -319,6 +319,18 @@ NtSystemDebugControl(
                 break;
 
             case SysDbgGetPrintBufferSize:
+                if (OutputBufferLength != sizeof(ULONG))
+                {
+                    Status = STATUS_INFO_LENGTH_MISMATCH;
+                }
+                else
+                {
+                    /* Return buffer size only if KD is enabled */
+                    *(PULONG)OutputBuffer = KdPitchDebugger ? 0 : KdPrintBufferSize;
+                    Status = STATUS_SUCCESS;
+                }
+                break;
+
             case SysDbgSetPrintBufferSize:
             case SysDbgGetKdUmExceptionEnable:
             case SysDbgSetKdUmExceptionEnable: