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libtpms/0001-tpm2-Reset-TPM2B-buffer-sizes-after-test-fails-for-v.patch
Marc-André Lureau b2795ccc53 Fixes CVE-2021-3623: out-of-bounds access when trying to resume the state of the vTPM 
Resolves: rhbz#1976814

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2021-06-30 10:44:03 +04:00

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From f16250b35aff6995e540143a9858c9cf0d1f9573 Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@linux.vnet.ibm.com>
Date: Mon, 21 Jun 2021 14:04:34 -0400
Subject: [PATCH 1/3] tpm2: Reset TPM2B buffer sizes after test fails for valid
buffer size
Reset the buffer size indicator in a TPM2B type of buffer after it failed
the test for the maximum buffer size it allows. This prevents having bad
buffer sizes in memory that can come to haunt us when writing the volatile
state for example.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
src/tpm2/NVMarshal.c | 1 +
src/tpm2/Unmarshal.c | 21 +++++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/src/tpm2/NVMarshal.c b/src/tpm2/NVMarshal.c
index efbab70..9f6d0f7 100644
--- a/src/tpm2/NVMarshal.c
+++ b/src/tpm2/NVMarshal.c
@@ -1503,6 +1503,7 @@ bn_prime_t_Unmarshal(bn_prime_t *data, BYTE **buffer, INT32 *size)
"allocated %zu\n",
(size_t)data->size, (size_t)data->allocated);
rc = TPM_RC_SIZE;
+ data->size = 0;
}
}
diff --git a/src/tpm2/Unmarshal.c b/src/tpm2/Unmarshal.c
index c692ccc..8e7a9b7 100644
--- a/src/tpm2/Unmarshal.c
+++ b/src/tpm2/Unmarshal.c
@@ -136,6 +136,7 @@ TPM2B_Unmarshal(TPM2B *target, UINT16 targetSize, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->size > targetSize) {
rc = TPM_RC_SIZE;
+ target->size = 0; // libtpms added
}
}
if (rc == TPM_RC_SUCCESS) {
@@ -1686,6 +1687,7 @@ TPMS_PCR_SELECTION_Unmarshal(TPMS_PCR_SELECTION *target, BYTE **buffer, INT32 *s
if ((target->sizeofSelect < PCR_SELECT_MIN) ||
(target->sizeofSelect > PCR_SELECT_MAX)) {
rc = TPM_RC_VALUE;
+ target->sizeofSelect = 0; // libtpms added
}
}
if (rc == TPM_RC_SUCCESS) {
@@ -1859,6 +1861,7 @@ TPML_CC_Unmarshal(TPML_CC *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_CAP_CC) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -1897,6 +1900,7 @@ TPML_CCA_Unmarshal(TPML_CCA *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_CAP_CC) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -1920,6 +1924,7 @@ TPML_ALG_Unmarshal(TPML_ALG *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_ALG_LIST_SIZE) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -1942,6 +1947,7 @@ TPML_HANDLE_Unmarshal(TPML_HANDLE *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_CAP_HANDLES) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -1970,11 +1976,13 @@ TPML_DIGEST_Unmarshal(TPML_DIGEST *target, BYTE **buffer, INT32 *size)
/* TPM side is hard coded to 2 minimum */
if (target->count < 2) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
if (rc == TPM_RC_SUCCESS) {
if (target->count > 8) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -1997,6 +2005,7 @@ TPML_DIGEST_VALUES_Unmarshal(TPML_DIGEST_VALUES *target, BYTE **buffer, INT32 *s
if (rc == TPM_RC_SUCCESS) {
if (target->count > HASH_COUNT) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -2019,6 +2028,7 @@ TPML_PCR_SELECTION_Unmarshal(TPML_PCR_SELECTION *target, BYTE **buffer, INT32 *s
if (rc == TPM_RC_SUCCESS) {
if (target->count > HASH_COUNT) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -2044,6 +2054,7 @@ TPML_ALG_PROPERTY_Unmarshal(TPML_ALG_PROPERTY *target, BYTE **buffer, INT32 *siz
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_CAP_ALGS) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -2066,6 +2077,7 @@ TPML_TAGGED_TPM_PROPERTY_Unmarshal(TPML_TAGGED_TPM_PROPERTY *target, BYTE **buf
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_TPM_PROPERTIES) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -2088,6 +2100,7 @@ TPML_TAGGED_PCR_PROPERTY_Unmarshal(TPML_TAGGED_PCR_PROPERTY *target, BYTE **buff
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_PCR_PROPERTIES) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -2110,6 +2123,7 @@ TPML_ECC_CURVE_Unmarshal(TPML_ECC_CURVE *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_ECC_CURVES) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -2132,6 +2146,7 @@ TPML_TAGGED_POLICY_Unmarshal(TPML_TAGGED_POLICY *target, BYTE **buffer, INT32 *s
if (rc == TPM_RC_SUCCESS) {
if (target->count > MAX_TAGGED_POLICIES) {
rc = TPM_RC_SIZE;
+ target->count = 0; // libtpms added
}
}
for (i = 0 ; (rc == TPM_RC_SUCCESS) && (i < target->count) ; i++) {
@@ -2781,6 +2796,7 @@ TPM2B_SENSITIVE_CREATE_Unmarshal(TPM2B_SENSITIVE_CREATE *target, BYTE **buffer,
if (rc == TPM_RC_SUCCESS) {
if (target->size != startSize - *size) {
rc = TPM_RC_SIZE;
+ target->size = 0; // libtpms added
}
}
return rc;
@@ -3540,6 +3556,7 @@ TPM2B_ECC_POINT_Unmarshal(TPM2B_ECC_POINT *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->size != startSize - *size) {
rc = TPM_RC_SIZE;
+ target->size = 0; // libtpms added
}
}
return rc;
@@ -4063,6 +4080,7 @@ TPM2B_PUBLIC_Unmarshal(TPM2B_PUBLIC *target, BYTE **buffer, INT32 *size, BOOL al
if (rc == TPM_RC_SUCCESS) {
if (target->size != startSize - *size) {
rc = TPM_RC_SIZE;
+ target->size = 0; // libtpms added
}
}
return rc;
@@ -4158,6 +4176,7 @@ TPM2B_SENSITIVE_Unmarshal(TPM2B_SENSITIVE *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->size != startSize - *size) {
rc = TPM_RC_SIZE;
+ target->size = 0; // libtpms added
}
}
}
@@ -4233,6 +4252,7 @@ TPMS_NV_PUBLIC_Unmarshal(TPMS_NV_PUBLIC *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->dataSize > MAX_NV_INDEX_SIZE) {
rc = TPM_RC_SIZE;
+ target->dataSize = 0; // libtpms added
}
}
return rc;
@@ -4263,6 +4283,7 @@ TPM2B_NV_PUBLIC_Unmarshal(TPM2B_NV_PUBLIC *target, BYTE **buffer, INT32 *size)
if (rc == TPM_RC_SUCCESS) {
if (target->size != startSize - *size) {
rc = TPM_RC_SIZE;
+ target->size = 0; // libtpms added
}
}
return rc;
--
2.29.0
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