Reviewed-by: Ruiyu Ni <ruiyu...@intel.com>
-Original Message-
From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of Hao Wu
Sent: Tuesday, September 19, 2017 7:39 PM
To: edk2-devel@lists.01.org
Cc: Wu, Hao A <hao.a...@intel.com>; Ni, Ruiyu <ruiyu...@intel.com>; Kinney,
Michael D <michael.d.kin...@intel.com>; Gao, Liming <liming....@intel.com>
Subject: [edk2] [PATCH 2/2] MdePkg/BaseLib: Avoid reading content beyond string
boundary
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=705
As mentioned in the above Bugzilla link by Steven, within the function
PathCleanUpDirectories(), when executing command:
"cd ."
under Shell, the input parameter 'Path' string will have string length less
than 2. Hence, it is possible for the below statement:
"if (StrCmp (Path + StrLen (Path) - 2, L"\\.") == 0) {"
to read contents before the string boundary.
This commit adds additional checks to avoid this.
Cc: Ruiyu Ni <ruiyu...@intel.com>
Cc: Steven Shi <steven@intel.com>
Cc: Michael Kinney <michael.d.kin...@intel.com>
Cc: Liming Gao <liming@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a...@intel.com>
---
MdePkg/Library/BaseLib/FilePaths.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/MdePkg/Library/BaseLib/FilePaths.c
b/MdePkg/Library/BaseLib/FilePaths.c
index 203045ccdc..d6f3758ecb 100644
--- a/MdePkg/Library/BaseLib/FilePaths.c
+++ b/MdePkg/Library/BaseLib/FilePaths.c
@@ -1,7 +1,7 @@
/** @file
Defines file-path manipulation functions.
- Copyright (c) 2011 - 2016, Intel Corporation. All rights reserved.
+ Copyright (c) 2011 - 2017, Intel Corporation. All rights
+ reserved.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD
License
which accompanies this distribution. The full text of the license may be
found at @@ -91,7 +91,7 @@ PathCleanUpDirectories(
while ((TempString = StrStr (Path, L"\\.\\")) != NULL) {
CopyMem (TempString, TempString + 2, StrSize (TempString + 2));
}
- if (StrCmp (Path + StrLen (Path) - 2, L"\\.") == 0) {
+ if ((StrLen (Path) >= 2) && (StrCmp (Path + StrLen (Path) - 2,
+ L"\\.") == 0)) {
Path[StrLen (Path) - 1] = CHAR_NULL;
}
--
2.12.0.windows.1
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