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Tue, 25 Aug 2026 11:20:01 -0700 (PDT) Received: from MSI.localdomain ([157.20.184.42]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3283d60c291sm1480549eec.6.2026.08.25.11.19.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Aug 2026 11:20:01 -0700 (PDT) From: sn0x-sharma To: jarkko@kernel.org Cc: James.Bottomley@HansenPartnership.com, zohar@linux.ibm.com, dhowells@redhat.com, linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, security@kernel.org, w@1wt.eu, sn0x-sharma Subject: [PATCH] keys: trusted: tpm1: add bounds check in tpm_seal() before memcpy Date: Tue, 25 Aug 2026 18:19:53 +0000 Message-ID: <20260825181953.15566-1-sanketsharmacsec@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit tpm_seal() computes storedsize from TPM response fields and passes it directly to memcpy() into a MAX_BLOB_SIZE buffer without bounds validation. A forged TPM response can set storedsize to 4086, overflowing the 512-byte blob by 3574 bytes into adjacent slab objects. Add a check that storedsize does not exceed MAX_BLOB_SIZE before the memcpy, returning -EINVAL on oversized responses. Reported-by: sn0x-sharma Link: https://lore.kernel.org/linux-integrity/ Signed-off-by: sn0x-sharma --- security/keys/trusted-keys/trusted_tpm1.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c index 8f57c6111..d47cb7108 100644 --- a/security/keys/trusted-keys/trusted_tpm1.c +++ b/security/keys/trusted-keys/trusted_tpm1.c @@ -531,6 +531,10 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype, /* copy the returned blob to caller */ if (!ret) { + if (storedsize > MAX_BLOB_SIZE) { + ret = -EINVAL; + goto out; + } memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize); *bloblen = storedsize; } -- 2.53.0