On Wed, 2010-12-01 at 17:48 +0000, David Howells wrote:
> Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx> wrote:
>
> > +static int TSS_sha1(const unsigned char *data, const unsigned int datalen,
> > + unsigned char *digest)
>
> You seem to have made a bunch of integer length parameters 'const'. Why? I
> was suggesting making them size_t, not const.
>
> I was suggesting making the data pointers const.
I think all the data pointers that are const have been fixed.
Will clean up the ints with size_t and not const as appropriate.
> > + if (!ret)
> > + TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE,
> > + paramdigest, TPM_NONCE_SIZE, h1,
> > + TPM_NONCE_SIZE, h2, 1, &c, 0, 0);
>
> TSS_rawhmac() can return an error.
will fix.
> > + ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, sizeof tb->data);
> > + memcpy(buf, tb->data + TPM_GETRANDOM_SIZE, len);
>
> trusted_tpm_send() won't fail?
will fix.
> > +static int my_get_random(unsigned char *buf, int len)
> > +{
> > + struct tpm_buf *tb;
> > + int ret;
> > +
> > + tb = kzalloc(sizeof *tb, GFP_KERNEL);
> > + if (!tb)
> > + return -ENOMEM;
> > + ret = tpm_get_random(tb, buf, len);
>
> Isn't is it pointless to use kzalloc() rather than kmalloc()?
correct - zero not needed here.
> > + my_get_random(hash, SHA1_DIGEST_SIZE);
> > + return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0;
>
> my_get_random() won't fail?
will fix.
> > + ret = TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE,
> > + enonce, TPM_NONCE_SIZE, ononce, 0, 0);
> > + return ret;
>
> These can be merged.
will merge.
> > +static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
> > +{
> > + int ret;
> > +
> > + INIT_BUF(tb);
> > + store16(tb, TPM_TAG_RQU_COMMAND);
> > + store32(tb, TPM_OIAP_SIZE);
> > + store32(tb, TPM_ORD_OIAP);
> > + ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE);
> > + if (ret < 0)
> > + return ret;
> > +
> > + *handle = LOAD32(tb->data, TPM_DATA_OFFSET);
> > + memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)],
> > + TPM_NONCE_SIZE);
> > + return ret;
> > +}
>
> If you don't need to return ret specifically, returning 0 would be more
> efficient.
right - this can be return 0;
> > + ret = TSS_checkhmac1(tb->data, ordinal, td->nonceodd, sess.secret,
> > + SHA1_DIGEST_SIZE, storedsize, TPM_DATA_OFFSET, 0,
> > + 0);
> > +
> > + /* copy the returned blob to caller */
> > + memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize);
> > + *bloblen = storedsize;
>
> Don't do that if TSS_checkhmac1() fails.
will fix.
> > + TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE,
> > + enonce1, nonceodd, cont, sizeof(uint32_t),
> > + &ordinal, bloblen, blob, 0, 0);
>
> TSS_authhmac() is called several times without checking for errors.
will fix.
> > + ret = TSS_checkhmac2(tb->data, ordinal, nonceodd,
> > + keyauth, SHA1_DIGEST_SIZE,
> > + blobauth, SHA1_DIGEST_SIZE,
> > + sizeof(uint32_t), TPM_DATA_OFFSET,
> > + *datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0,
> > + 0);
> > + if (ret < 0)
> > + pr_info("trusted_key: TSS_checkhmac2 failed (%d)\n", ret);
> > + memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen);
> > + return ret;
>
> Don't do the memcpy() if TSS_checkhmac2() fails.
will fix.
> > + ret = tpm_unseal(tb, o->keyhandle, o->keyauth, p->blob, p->blob_len,
> > + o->blobauth, p->key, &p->key_len);
> > + /* pull migratable flag out of sealed key */
> > + p->migratable = p->key[--p->key_len];
>
> Don't do that if tpm_unseal() fails.
will fix.
> > +static const match_table_t key_tokens = {
> > + {Opt_new, "new"},
> > + {Opt_load, "load"},
> > + {Opt_update, "update"},
> > + {Opt_keyhandle, "keyhandle=%s"},
> > + {Opt_keyauth, "keyauth=%s"},
> > + {Opt_blobauth, "blobauth=%s"},
> > + {Opt_pcrinfo, "pcrinfo=%s"},
> > + {Opt_pcrlock, "pcrlock=%s"},
> > + {Opt_migratable, "migratable=%s"},
> > + {Opt_err, NULL}
>
> Spaces after { and before }. I'd also suggest using tabs to align the strings
> vertically, but that's up to you.
Lindent takes the spaces out, CodingStyle doesn't say, and most similar
examples in the kernel leave them out.
> > + p = kzalloc(sizeof *p, GFP_KERNEL);
> > +
> > + /* migratable by default */
> > + p->migratable = 1;
>
> NAK! p might be NULL.
yikes! will fix.
dave
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