[edk2-devel] [PATCH EDK2 v2 1/1] MdeModulePkg/PiSmmCore:Avoid overflow risk
wenyi,xie via groups.io
xiewenyi2=huawei.com at groups.io
Mon Aug 15 11:45:29 UTC 2022
As the CommunicationBuffer plus BufferSize may overflow, check the
value first before using.
Cc: Jian J Wang <jian.j.wang at intel.com>
Cc: Liming Gao <gaoliming at byosoft.com.cn>
Cc: Eric Dong <eric.dong at intel.com>
Cc: Ray Ni <ray.ni at intel.com>
Signed-off-by: Wenyi Xie <xiewenyi2 at 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
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