linux-kernel - [PATCH 4.14 010/251] tpm: Check for integer overflow in tpm2_map_response

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211124115710.574741560@linuxfoundation.org>
Date:   Wed, 24 Nov 2021 12:54:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Jarkko Sakkinen <jarkko@...nel.org>
Subject: [PATCH 4.14 010/251] tpm: Check for integer overflow in tpm2_map_response_body()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit a0bcce2b2a169e10eb265c8f0ebdd5ae4c875670 upstream.

The "4 * be32_to_cpu(data->count)" multiplication can potentially
overflow which would lead to memory corruption.  Add a check for that.

Cc: stable@...r.kernel.org
Fixes: 745b361e989a ("tpm: infrastructure for TPM spaces")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/char/tpm/tpm2-space.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/char/tpm/tpm2-space.c
+++ b/drivers/char/tpm/tpm2-space.c
@@ -422,6 +422,9 @@ static int tpm2_map_response_body(struct
 	if (be32_to_cpu(data->capability) != TPM2_CAP_HANDLES)
 		return 0;
 
+	if (be32_to_cpu(data->count) > (UINT_MAX - TPM_HEADER_SIZE - 9) / 4)
+		return -EFAULT;
+
 	if (len != TPM_HEADER_SIZE + 9 + 4 * be32_to_cpu(data->count))
 		return -EFAULT;