Messages in this thread Patch in this message | | | 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 |
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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 <stefanb@linux.vnet.ibm.com> Acked-by: Mimi Zohar <zohar@us.ibm.com> --- 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
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