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

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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: 5beb0c435b ("keys, trusted: seal with a TPM2 authorization policy")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Peter Huewe <peterhuewe@gmx.de>
This commit is contained in:
Jarkko Sakkinen 2016-01-06 16:43:30 +02:00
parent e5be990c2f
commit f3c82ade7c
3 changed files with 10 additions and 15 deletions
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12
drivers/char/tpm/tpm2-cmd.c
View File

@ -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);

2
include/keys/trusted-type.h
View File

@ -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;
};

11
security/keys/trusted.c
View File

@ -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)