Messages in this thread | | | Subject | Re: [Linux-ima-devel] [PATCH v2 4/5] keys, trusted: modify arguments of tpm_pcr_extend() | From | Roberto Sassu <> | Date | Tue, 30 May 2017 09:36:13 +0200 |
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On 5/30/2017 5:35 AM, Mimi Zohar wrote: > On Fri, 2017-05-05 at 16:21 +0200, Roberto Sassu wrote: >> 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). > > If the number of arguments is wrong, that means the patch that > introduced the change is not bi-sect safe. (This comment is > applicable to patch 5/5 too.)
Jarkko (the TPM driver maintainer) asked me to not introduce a new function to pass multiple digests, but to modify the parameters of tpm_pcr_extend().
Roberto
> > Mimi > >> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.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; >> } >> >> /* >
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