linux-kernel - [PATCH v2 4/5] keys, trusted: modify arguments of tpm_pcr

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Date:   Fri, 5 May 2017 16:21:51 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <tpmdd-devel@...ts.sourceforge.net>
CC:     <linux-ima-devel@...ts.sourceforge.net>,
        <linux-security-module@...r.kernel.org>,
        <keyrings@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH v2 4/5] keys, trusted: modify arguments of tpm_pcr_extend()

pcrlock() has been modified to pass the correct arguments
to tpm_pcr_extend(): the pointer of a tpm2_digest structure containing
a random value generated by tpm_get_random() and the size of the array (1).

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 security/keys/trusted.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index 2ae31c5..3eb89e6 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -377,15 +377,15 @@ static int trusted_tpm_send(const u32 chip_num, unsigned char *cmd,
  */
 static int pcrlock(const int pcrnum)
 {
-	unsigned char hash[SHA1_DIGEST_SIZE];
+	struct tpm2_digest digestarg = {.alg_id = TPM2_ALG_SHA1};
 	int ret;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	ret = tpm_get_random(TPM_ANY_NUM, hash, SHA1_DIGEST_SIZE);
+	ret = tpm_get_random(TPM_ANY_NUM, digestarg.digest, SHA1_DIGEST_SIZE);
 	if (ret != SHA1_DIGEST_SIZE)
 		return ret;
-	return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0;
+	return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, 1, &digestarg) ? -EINVAL : 0;
 }
 
 /*
-- 
2.9.3