Commit f3c82ade authored by Jarkko Sakkinen's avatar Jarkko Sakkinen
Browse files

tpm: fix checks for policy digest existence in tpm2_seal_trusted() 



In my original patch sealing with policy was done with dynamically
allocated buffer that I changed later into an array so the checks in
tpm2-cmd.c became invalid. This patch fixes the issue.

Fixes: 5beb0c43 ("keys, trusted: seal with a TPM2 authorization policy")
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: default avatarPeter Huewe <peterhuewe@gmx.de>
parent e5be990c

drivers/char/tpm/tpm2-cmd.c

+4 −8
Original line number Diff line number Diff line
@@ -478,20 +478,16 @@ int tpm2_seal_trusted(struct tpm_chip *chip, 
	tpm_buf_append_u8(&buf, payload->migratable);



	/* public */

	if (options->policydigest)

		tpm_buf_append_u16(&buf, 14 + options->digest_len);

	else

		tpm_buf_append_u16(&buf, 14);



	tpm_buf_append_u16(&buf, 14 + options->policydigest_len);

	tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH);

	tpm_buf_append_u16(&buf, hash);



	/* policy */

	if (options->policydigest) {

	if (options->policydigest_len) {

		tpm_buf_append_u32(&buf, 0);

		tpm_buf_append_u16(&buf, options->digest_len);

		tpm_buf_append_u16(&buf, options->policydigest_len);

		tpm_buf_append(&buf, options->policydigest,

			       options->digest_len);

			       options->policydigest_len);

	} else {

		tpm_buf_append_u32(&buf, TPM2_ATTR_USER_WITH_AUTH);

		tpm_buf_append_u16(&buf, 0);

include/keys/trusted-type.h

+1 −1
Original line number Diff line number Diff line
@@ -38,7 +38,7 @@ struct trusted_key_options { 
	unsigned char pcrinfo[MAX_PCRINFO_SIZE];

	int pcrlock;

	uint32_t hash;

	uint32_t digest_len;

	uint32_t policydigest_len;

	unsigned char policydigest[MAX_DIGEST_SIZE];

	uint32_t policyhandle;

};

security/keys/trusted.c

+5 −6
Original line number Diff line number Diff line
@@ -744,6 +744,7 @@ static int getoptions(char *c, struct trusted_key_payload *pay, 
	unsigned long handle;

	unsigned long lock;

	unsigned long token_mask = 0;

	unsigned int digest_len;

	int i;

	int tpm2;
@@ -752,7 +753,6 @@ static int getoptions(char *c, struct trusted_key_payload *pay, 
		return tpm2;



	opt->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1;

	opt->digest_len = hash_digest_size[opt->hash];



	while ((p = strsep(&c, " \t"))) {

		if (*p == '\0' || *p == ' ' || *p == '\t')
@@ -812,8 +812,6 @@ static int getoptions(char *c, struct trusted_key_payload *pay, 
			for (i = 0; i < HASH_ALGO__LAST; i++) {

				if (!strcmp(args[0].from, hash_algo_name[i])) {

					opt->hash = i;

					opt->digest_len =

						hash_digest_size[opt->hash];

					break;

				}

			}
@@ -825,13 +823,14 @@ static int getoptions(char *c, struct trusted_key_payload *pay, 
			}

			break;

		case Opt_policydigest:

			if (!tpm2 ||

			    strlen(args[0].from) != (2 * opt->digest_len))

			digest_len = hash_digest_size[opt->hash];

			if (!tpm2 || strlen(args[0].from) != (2 * digest_len))

				return -EINVAL;

			res = hex2bin(opt->policydigest, args[0].from,

				      opt->digest_len);

				      digest_len);

			if (res < 0)

				return -EINVAL;

			opt->policydigest_len = digest_len;

			break;

		case Opt_policyhandle:

			if (!tpm2)

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