From 0b37723186ec1525b6caf14b0309fb0ed04084d7 Mon Sep 17 00:00:00 2001
From: Giri Mudusuru <girim@apple.com>
Date: Sat, 6 May 2023 18:28:24 +0800
Subject: ShellPkg/UefiShellDebug1CommandsLib: Replace hardcoded SMBIOS
 strings.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3805

Replace hardcoded SMBIOS Anchor string and size with defines.

Fix buffer overflow as described below.

Smbios64BitPrintEPSInfo () is coded like:
UINT8  Anchor[5];

MemToString (Anchor, SmbiosTable->AnchorString, 5);

But the definition of MemToString()
  Copy Length of Src buffer to Dest buffer,
  add a NULL termination to Dest buffer.

So Anchor needs to be +1 the size of the SMBIOS Anchor string `_SM3_`.

Changes from v1 to v2:
 - Replace doxygen style inline comments

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Andrew Fish <afish@apple.com>
Signed-off-by: Giri Mudusuru <girim@apple.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
---
 .../Library/UefiShellDebug1CommandsLib/SmbiosView/PrintInfo.c    | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'ShellPkg/Library/UefiShellDebug1CommandsLib/SmbiosView/PrintInfo.c')

diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/SmbiosView/PrintInfo.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/SmbiosView/PrintInfo.c
index 1811cf0c44..a14b79904d 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/SmbiosView/PrintInfo.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/SmbiosView/PrintInfo.c
@@ -5,6 +5,7 @@
   Copyright (c) 1985 - 2022, American Megatrends International LLC.<BR>
   (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
   (C) Copyright 2015-2019 Hewlett Packard Enterprise Development LP<BR>
+  Copyright (c) 2023 Apple Inc. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
@@ -135,7 +136,7 @@ SmbiosPrintEPSInfo (
   IN  UINT8                     Option
   )
 {
-  UINT8  Anchor[5];
+  UINT8  Anchor[SMBIOS_ANCHOR_STRING_LENGTH + 1]; // Including terminating NULL character
   UINT8  InAnchor[6];
 
   if (SmbiosTable == NULL) {
@@ -149,7 +150,7 @@ SmbiosPrintEPSInfo (
 
   if (Option >= SHOW_NORMAL) {
     ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_SMBIOSVIEW_PRINTINFO_ENTRY_POINT_SIGN), gShellDebug1HiiHandle);
-    MemToString (Anchor, SmbiosTable->AnchorString, 4);
+    MemToString (Anchor, SmbiosTable->AnchorString, SMBIOS_ANCHOR_STRING_LENGTH);
     ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_SMBIOSVIEW_PRINTINFO_ANCHOR_STR), gShellDebug1HiiHandle, Anchor);
     ShellPrintHiiEx (
       -1,
@@ -220,7 +221,7 @@ Smbios64BitPrintEPSInfo (
   IN  UINT8                         Option
   )
 {
-  UINT8  Anchor[5];
+  UINT8  Anchor[SMBIOS_3_0_ANCHOR_STRING_LENGTH + 1]; // Including terminating NULL character
 
   if (SmbiosTable == NULL) {
     ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_SMBIOSVIEW_PRINTINFO_SMBIOSTABLE_NULL), gShellDebug1HiiHandle);
@@ -234,7 +235,7 @@ Smbios64BitPrintEPSInfo (
   if (Option >= SHOW_NORMAL) {
     ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_SMBIOSVIEW_PRINTINFO_64_BIT_ENTRY_POINT_SIGN), gShellDebug1HiiHandle);
 
-    MemToString (Anchor, SmbiosTable->AnchorString, 5);
+    MemToString (Anchor, SmbiosTable->AnchorString, SMBIOS_3_0_ANCHOR_STRING_LENGTH);
     ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_SMBIOSVIEW_PRINTINFO_ANCHOR_STR), gShellDebug1HiiHandle, Anchor);
 
     ShellPrintHiiEx (
-- 
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