As the CommunicationBuffer plus BufferSize may overflow, check the
value first before using.
Cc: Jian J Wang <jian.j.w...@intel.com>
Cc: Liming Gao <gaolim...@byosoft.com.cn>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Signed-off-by: Wenyi Xie <xiewen...@huawei.com>
---
MdeModulePkg/Core/PiSmmCore/PiSmmCore.c | 5 ++++-
MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c | 4 ++++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
b/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
index 9e5c6cbe33dd..a2a97a4056ee 100644
--- a/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
+++ b/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
@@ -621,6 +621,9 @@ InternalIsBufferOverlapped (
IN UINTN Size2
)
{
+ if (((UINTN)Buff1 > MAX_UINTN - Size1) || ((UINTN)Buff2 > MAX_UINTN -
Size2)) {
+ return TRUE;
+ }
//
// If buff1's end is less than the start of buff2, then it's ok.
// Also, if buff1's start is beyond buff2's end, then it's ok.
@@ -703,7 +706,7 @@ SmmEntryPoint (
//
// If CommunicationBuffer is not in valid address scope,
// or there is overlap between gSmmCorePrivate and CommunicationBuffer,
- // return EFI_INVALID_PARAMETER
+ // return EFI_ACCESS_DENIED
//
gSmmCorePrivate->CommunicationBuffer = NULL;
gSmmCorePrivate->ReturnStatus = EFI_ACCESS_DENIED;
diff --git a/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c
b/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c
index 4f00cebaf5ed..fe3e6ba54281 100644
--- a/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c
+++ b/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c
@@ -525,6 +525,10 @@ SmmCommunicationCommunicate (
CommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *)CommBuffer;
+ if (CommunicateHeader->MessageLength > MAX_UINTN - OFFSET_OF
(EFI_SMM_COMMUNICATE_HEADER, Data)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
if (CommSize == NULL) {
TempCommSize = OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data) +
CommunicateHeader->MessageLength;
} else {
--
2.20.1.windows.1
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#92424): https://edk2.groups.io/g/devel/message/92424
Mute This Topic: https://groups.io/mt/93034134/21656
Group Owner: devel+ow...@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-
