From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Berger Subject: [PATCH] tpm: Fix expected number of response bytes of TPM1.2 PCR Extend Date: Wed, 15 Feb 2017 11:56:23 -0500 Message-ID: <1487177783-15687-1-git-send-email-stefanb@linux.vnet.ibm.com> Return-path: Sender: owner-linux-security-module@vger.kernel.org To: tpmdd-devel@lists.sourceforge.net, james.l.morris@oracle.com Cc: linux-security-module@vger.kernel.org, jarkko.sakkinen@linux.intel.com, linux-kernel@vger.kernel.org, zohar@linux.vnet.ibm.com, Stefan Berger List-Id: tpmdd-devel@lists.sourceforge.net The TPM1.2 PCR Extend operation only returns 20 bytes in the body, which is the size of the PCR state. This fixes a problem where IMA gets errors with every PCR Extend. Fixes: c659af78eb7b ("tpm: Check size of response before accessing data") Signed-off-by: Stefan Berger Acked-by: Mimi Zohar --- drivers/char/tpm/tpm-interface.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 6e368ee..bd2128e 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -767,7 +767,7 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read); #define TPM_ORD_PCR_EXTEND cpu_to_be32(20) #define EXTEND_PCR_RESULT_SIZE 34 -#define EXTEND_PCR_RESULT_BODY_SIZE 24 +#define EXTEND_PCR_RESULT_BODY_SIZE 20 static const struct tpm_input_header pcrextend_header = { .tag = TPM_TAG_RQU_COMMAND, .length = cpu_to_be32(34), -- 2.4.3