On Thu, 2024-11-07 at 15:49 +0200, Jarkko Sakkinen wrote:
> On Thu Nov 7, 2024 at 3:20 PM EET, James Bottomley wrote:
> > On Thu, 2024-11-07 at 11:51 +0200, Jarkko Sakkinen wrote:
> > [...]
> > > +void tpm_buf_append_auth(struct tpm_chip *chip, struct tpm_buf
> > > *buf,
> > > + u8 attributes, u8 *passphrase, int
> > > passphrase_len)
> > > +{
> > > + /* offset tells us where the sessions area begins */
> > > + int offset = buf->handles * 4 + TPM_HEADER_SIZE;
> > > + u32 len = 9 + passphrase_len;
> > > +
> > > + if (tpm_buf_length(buf) != offset) {
> > > + /* not the first session so update the existing
> > > length */
> > > + len += get_unaligned_be32(&buf->data[offset]);
> > > + put_unaligned_be32(len, &buf->data[offset]);
> > > + } else {
> > > + tpm_buf_append_u32(buf, len);
> > > + }
> > > + /* auth handle */
> > > + tpm_buf_append_u32(buf, TPM2_RS_PW);
> > > + /* nonce */
> > > + tpm_buf_append_u16(buf, 0);
> > > + /* attributes */
> > > + tpm_buf_append_u8(buf, 0);
> > > + /* passphrase */
> > > + tpm_buf_append_u16(buf, passphrase_len);
> > > + tpm_buf_append(buf, passphrase, passphrase_len);
> > > +}
> > > +
> >
> > The rest of the code looks fine, but if you're going to extract
> > this as a separate function instead of doing the open coded struct
> > tpm2_null_auth that was there originally, you should probably
> > extract and use the tpm2_buf_append_auth() function in
> > trusted_tpm2.c
>
> So this was straight up from Mimi's original patch :-)
Yes, I had the same comment prepped for that too.
> Hmm... was there duplicate use for this in the patch? I'll check
> this.
The original open coded the empty auth append with struct
tpm2_null_auth since it's the only user. However, since we do have
another user in trusted keys, it might make sense to consolidate.
James
