Philipp Deppenwiese submitted this change.
security/tpm: Use correct hash digest lengths
TPMU_HA is a union of all the different hash digests, and so
sizeof(TPMU_HA) evaluates to 64 (the size of the largest one). This will
lead to out-of-bounds writes when copying smaller digests, so use the
specific digest size for each algorithm.
Change-Id: Ic9101f157d5a19836b200ecd99f060de552498d2
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 14049{49,50,51,52,53,54,55,56,57,58,60,61,62}
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35287
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
---
M src/security/tpm/tspi/tspi.c
M src/security/tpm/tss/tcg-2.0/tss.c
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/src/security/tpm/tspi/tspi.c b/src/security/tpm/tspi/tspi.c
index 4cf3711..e64e04f 100644
--- a/src/security/tpm/tspi/tspi.c
+++ b/src/security/tpm/tspi/tspi.c
@@ -219,12 +219,12 @@
case VB2_HASH_SHA1:
tpml_digests.digests[0].hashAlg = TPM_ALG_SHA1;
memcpy(tpml_digests.digests[0].digest.sha1,
- digest, sizeof(TPMU_HA));
+ digest, SHA1_DIGEST_SIZE);
break;
case VB2_HASH_SHA256:
tpml_digests.digests[0].hashAlg = TPM_ALG_SHA256;
memcpy(tpml_digests.digests[0].digest.sha256,
- digest, sizeof(TPMU_HA));
+ digest, SHA256_DIGEST_SIZE);
break;
default:
return TPM_E_IOERROR;
diff --git a/src/security/tpm/tss/tcg-2.0/tss.c b/src/security/tpm/tss/tcg-2.0/tss.c
index fab334f..d9deba5 100644
--- a/src/security/tpm/tss/tcg-2.0/tss.c
+++ b/src/security/tpm/tss/tcg-2.0/tss.c
@@ -148,27 +148,27 @@
case TPM_ALG_SHA1:
memcpy(pcr_ext_cmd.digests.digests[i].digest.sha1,
tpml_digests->digests[i].digest.sha1,
- sizeof(TPMU_HA));
+ SHA1_DIGEST_SIZE);
break;
case TPM_ALG_SHA256:
memcpy(pcr_ext_cmd.digests.digests[i].digest.sha256,
tpml_digests->digests[i].digest.sha256,
- sizeof(TPMU_HA));
+ SHA256_DIGEST_SIZE);
break;
case TPM_ALG_SHA384:
memcpy(pcr_ext_cmd.digests.digests[i].digest.sha384,
tpml_digests->digests[i].digest.sha384,
- sizeof(TPMU_HA));
+ SHA384_DIGEST_SIZE);
break;
case TPM_ALG_SHA512:
memcpy(pcr_ext_cmd.digests.digests[i].digest.sha512,
tpml_digests->digests[i].digest.sha512,
- sizeof(TPMU_HA));
+ SHA512_DIGEST_SIZE);
break;
case TPM_ALG_SM3_256:
memcpy(pcr_ext_cmd.digests.digests[i].digest.sm3_256,
tpml_digests->digests[i].digest.sm3_256,
- sizeof(TPMU_HA));
+ SM3_256_DIGEST_SIZE);
break;
}
}
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