This commit contains the patch files and tests for DxeTpmMeasureBootLib
CVE 2022-36764.
Cc: Jiewen Yao <jiewen....@intel.com>
Signed-off-by: Doug Flick [MSFT] <doug.e...@gmail.com>
---
.../DxeTpmMeasureBootLibSanitization.h | 23 +++++
.../DxeTpmMeasureBootLib.c | 13 ++-
.../DxeTpmMeasureBootLibSanitization.c | 44 +++++++++
.../DxeTpmMeasureBootLibSanitizationTest.c | 98 +++++++++++++++++--
4 files changed, 168 insertions(+), 10 deletions(-)
diff --git
a/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.h
b/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.h
index 0d9d00c281f6..2248495813b5 100644
---
a/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.h
+++
b/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.h
@@ -111,4 +111,27 @@ SanitizePrimaryHeaderGptEventSize (
OUT UINT32 *EventSize
);
+/**
+ This function will validate that the PeImage Event Size from the loaded
image is sane
+ It will check the following:
+ - EventSize does not overflow
+
+ @param[in] FilePathSize - Size of the file path.
+ @param[out] EventSize - Pointer to the event size.
+
+ @retval EFI_SUCCESS
+ The event size is valid.
+
+ @retval EFI_OUT_OF_RESOURCES
+ Overflow would have occurred.
+
+ @retval EFI_INVALID_PARAMETER
+ One of the passed parameters was invalid.
+**/
+EFI_STATUS
+SanitizePeImageEventSize (
+ IN UINT32 FilePathSize,
+ OUT UINT32 *EventSize
+ );
+
#endif // DXE_TPM_MEASURE_BOOT_LIB_VALIDATION_
diff --git a/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLib.c
b/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLib.c
index 669ab1913440..a9fc440a091e 100644
--- a/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLib.c
+++ b/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLib.c
@@ -17,6 +17,7 @@
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
+Copyright (c) Microsoft Corporation.<BR>
Copyright (c) Microsoft Corporation.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -345,18 +346,22 @@ TcgMeasurePeImage (
ImageLoad = NULL;
SectionHeader = NULL;
Sha1Ctx = NULL;
+ TcgEvent = NULL;
FilePathSize = (UINT32)GetDevicePathSize (FilePath);
- //
// Determine destination PCR by BootPolicy
//
- EventSize = sizeof (*ImageLoad) - sizeof (ImageLoad->DevicePath) +
FilePathSize;
- TcgEvent = AllocateZeroPool (EventSize + sizeof (TCG_PCR_EVENT));
+ Status = SanitizePeImageEventSize (FilePathSize, &EventSize);
+ if (EFI_ERROR (Status)) {
+ return EFI_UNSUPPORTED;
+ }
+
+ TcgEvent = AllocateZeroPool (EventSize);
if (TcgEvent == NULL) {
return EFI_OUT_OF_RESOURCES;
}
- TcgEvent->EventSize = EventSize;
+ TcgEvent->EventSize = EventSize - sizeof (TCG_PCR_EVENT_HDR);
ImageLoad = (EFI_IMAGE_LOAD_EVENT *)TcgEvent->Event;
switch (ImageType) {
diff --git
a/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.c
b/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.c
index a3fa46f5e632..c989851cec2d 100644
---
a/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.c
+++
b/SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLibSanitization.c
@@ -239,3 +239,47 @@ SanitizePrimaryHeaderGptEventSize (
return EFI_SUCCESS;
}
+
+/**
+ This function will validate that the PeImage Event Size from the loaded
image is sane
+ It will check the following:
+ - EventSize does not overflow
+
+ @param[in] FilePathSize - Size of the file path.
+ @param[out] EventSize - Pointer to the event size.
+
+ @retval EFI_SUCCESS
+ The event size is valid.
+
+ @retval EFI_OUT_OF_RESOURCES
+ Overflow would have occurred.
+
+ @retval EFI_INVALID_PARAMETER
+ One of the passed parameters was invalid.
+**/
+EFI_STATUS
+SanitizePeImageEventSize (
+ IN UINT32 FilePathSize,
+ OUT UINT32 *EventSize
+ )
+{
+ EFI_STATUS Status;
+
+ // Replacing logic:
+ // sizeof (*ImageLoad) - sizeof (ImageLoad->DevicePath) + FilePathSize;
+ Status = SafeUint32Add (OFFSET_OF (EFI_IMAGE_LOAD_EVENT, DevicePath),
FilePathSize, EventSize);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "EventSize would overflow!\n"));
+ return EFI_BAD_BUFFER_SIZE;
+ }
+
+ // Replacing logic:
+ // EventSize + sizeof (TCG_PCR_EVENT_HDR)
+ Status = SafeUint32Add (*EventSize, sizeof (TCG_PCR_EVENT_HDR), EventSize);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "EventSize would overflow!\n"));
+ return EFI_BAD_BUFFER_SIZE;
+ }
+
+ return EFI_SUCCESS;
+}
diff --git
a/SecurityPkg/Library/DxeTpmMeasureBootLib/InternalUnitTest/DxeTpmMeasureBootLibSanitizationTest.c
b/SecurityPkg/Library/DxeTpmMeasureBootLib/InternalUnitTest/DxeTpmMeasureBootLibSanitizationTest.c
index eeb928cdb0aa..c41498be4521 100644
---
a/SecurityPkg/Library/DxeTpmMeasureBootLib/InternalUnitTest/DxeTpmMeasureBootLibSanitizationTest.c
+++
b/SecurityPkg/Library/DxeTpmMeasureBootLib/InternalUnitTest/DxeTpmMeasureBootLibSanitizationTest.c
@@ -1,8 +1,8 @@
/** @file
-This file includes the unit test cases for the
DxeTpmMeasureBootLibSanitizationTest.c.
+ This file includes the unit test cases for the
DxeTpmMeasureBootLibSanitizationTest.c.
-Copyright (c) Microsoft Corporation.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
+ Copyright (c) Microsoft Corporation.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
@@ -186,9 +186,6 @@ TestSanitizePrimaryHeaderGptEventSize (
EFI_STATUS Status;
EFI_PARTITION_TABLE_HEADER PrimaryHeader;
UINTN NumberOfPartition;
- EFI_GPT_DATA *GptData;
-
- GptData = NULL;
// Test that a normal PrimaryHeader passes validation
PrimaryHeader.NumberOfPartitionEntries = 5;
@@ -222,6 +219,94 @@ TestSanitizePrimaryHeaderGptEventSize (
return UNIT_TEST_PASSED;
}
+/**
+ This function tests the SanitizePeImageEventSize function.
+ It's intent is to test that the untrusted input from a file path for an
+ EFI_IMAGE_LOAD_EVENT structure will not cause an overflow when calculating
+ the event size when allocating space.
+
+ @param[in] Context The unit test context.
+
+ @retval UNIT_TEST_PASSED The test passed.
+ @retval UNIT_TEST_ERROR_TEST_FAILED The test failed.
+**/
+UNIT_TEST_STATUS
+EFIAPI
+TestSanitizePeImageEventSize (
+ IN UNIT_TEST_CONTEXT Context
+ )
+{
+ UINT32 EventSize;
+ UINTN ExistingLogicEventSize;
+ UINT32 FilePathSize;
+ EFI_STATUS Status;
+ EFI_DEVICE_PATH_PROTOCOL DevicePath;
+ EFI_IMAGE_LOAD_EVENT *ImageLoadEvent;
+ UNIT_TEST_STATUS TestStatus;
+
+ TestStatus = UNIT_TEST_ERROR_TEST_FAILED;
+
+ // Generate EFI_DEVICE_PATH_PROTOCOL test data
+ DevicePath.Type = 0;
+ DevicePath.SubType = 0;
+ DevicePath.Length[0] = 0;
+ DevicePath.Length[1] = 0;
+
+ // Generate EFI_IMAGE_LOAD_EVENT test data
+ ImageLoadEvent = AllocateZeroPool (sizeof (EFI_IMAGE_LOAD_EVENT) + sizeof
(EFI_DEVICE_PATH_PROTOCOL));
+ if (ImageLoadEvent == NULL) {
+ DEBUG ((DEBUG_ERROR, "%a: AllocateZeroPool failed\n", __func__));
+ goto Exit;
+ }
+
+ // Populate EFI_IMAGE_LOAD_EVENT54 test data
+ ImageLoadEvent->ImageLocationInMemory = (EFI_PHYSICAL_ADDRESS)0x12345678;
+ ImageLoadEvent->ImageLengthInMemory = 0x1000;
+ ImageLoadEvent->ImageLinkTimeAddress = (UINTN)ImageLoadEvent;
+ ImageLoadEvent->LengthOfDevicePath = sizeof (EFI_DEVICE_PATH_PROTOCOL);
+ CopyMem (ImageLoadEvent->DevicePath, &DevicePath, sizeof
(EFI_DEVICE_PATH_PROTOCOL));
+
+ FilePathSize = 255;
+
+ // Test that a normal PE image passes validation
+ Status = SanitizePeImageEventSize (FilePathSize, &EventSize);
+ if (EFI_ERROR (Status)) {
+ UT_LOG_ERROR ("SanitizePeImageEventSize failed with %r\n", Status);
+ goto Exit;
+ }
+
+ // Test that the event size is correct compared to the existing logic
+ ExistingLogicEventSize = OFFSET_OF (EFI_IMAGE_LOAD_EVENT, DevicePath) +
FilePathSize;
+ ExistingLogicEventSize += sizeof (TCG_PCR_EVENT_HDR);
+
+ if (EventSize != ExistingLogicEventSize) {
+ UT_LOG_ERROR ("SanitizePeImageEventSize returned an incorrect event size.
Expected %u, got %u\n", ExistingLogicEventSize, EventSize);
+ goto Exit;
+ }
+
+ // Test that the event size may not overflow
+ Status = SanitizePeImageEventSize (MAX_UINT32, &EventSize);
+ if (Status != EFI_BAD_BUFFER_SIZE) {
+ UT_LOG_ERROR ("SanitizePeImageEventSize succeded when it was supposed to
fail with %r\n", Status);
+ goto Exit;
+ }
+
+ TestStatus = UNIT_TEST_PASSED;
+Exit:
+
+ if (ImageLoadEvent != NULL) {
+ FreePool (ImageLoadEvent);
+ }
+
+ if (TestStatus == UNIT_TEST_ERROR_TEST_FAILED) {
+ DEBUG ((DEBUG_ERROR, "%a: Test failed\n", __func__));
+ } else {
+ DEBUG ((DEBUG_INFO, "%a: Test passed\n", __func__));
+ }
+
+ return TestStatus;
+}
+
// *--------------------------------------------------------------------*
// * Unit Test Code Main Function
// *--------------------------------------------------------------------*
@@ -265,6 +350,7 @@ UefiTestMain (
AddTestCase (TcgMeasureBootLibValidationTestSuite, "Tests Validating EFI
Partition Table", "Common.TcgMeasureBootLibValidation",
TestSanitizeEfiPartitionTableHeader, NULL, NULL, NULL);
AddTestCase (TcgMeasureBootLibValidationTestSuite, "Tests Primary header gpt
event checks for overflow", "Common.TcgMeasureBootLibValidation",
TestSanitizePrimaryHeaderAllocationSize, NULL, NULL, NULL);
AddTestCase (TcgMeasureBootLibValidationTestSuite, "Tests Primary header
allocation size checks for overflow", "Common.TcgMeasureBootLibValidation",
TestSanitizePrimaryHeaderGptEventSize, NULL, NULL, NULL);
+ AddTestCase (TcgMeasureBootLibValidationTestSuite, "Tests PE Image and
FileSize checks for overflow", "Common.TcgMeasureBootLibValidation",
TestSanitizePeImageEventSize, NULL, NULL, NULL);
Status = RunAllTestSuites (Framework);
--
2.43.0
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