Hi Ilias, I don't know where to find the spec for the tpm v2 nv_define command. I was just wondering why this command does not work in u-boot. Then I found a patch, that has never been applied to the master, see https://lists.denx.de/pipermail/u-boot/2023-December/542089.html, where the nv_define's message buf was "fixed". I tried this change and the nv_define command is working now.
Alex > -----Original Message----- > From: Ilias Apalodimas <ilias.apalodi...@linaro.org> > Sent: Tuesday, February 18, 2025 8:38 AM > To: Michel Alex <alex.mic...@wiedemann-group.com> > Cc: u-boot@lists.denx.de > Subject: Re: [PATCH 1/1] tpm: fixed the nv_define_space command in TPMv2 > > Vorsicht: Es handelt sich um eine externe E-Mail vom Absender Ilias > Apalodimas <ilias.apalodi...@linaro.org>. Bitte klicken Sie nicht auf Links > oder > Anhänge, solange Sie nicht von der Echtheit der Nachricht überzeugt sind. > > Hi Michel > > On Thu, Feb 13, 2025 at 12:43:34PM +0000, Michel Alex wrote: > > Added 2 HMAC bytes to the command message > > Please cc the TPM maintainers, otherwise I might miss this patch. > > What the patch does is obvious, can you add a better explanation of > - what it fixes / what was broken? > - pointers to spec that define the hmac size and placement? > > Thanks > /Ilias > > > > Signed-off-by: Alex Michel <alex.mic...@wiedemann-group.com> > > --- > > lib/tpm-v2.c | 5 +++-- > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index > > 9ca7933c094..4a082af78af 100644 > > --- a/lib/tpm-v2.c > > +++ b/lib/tpm-v2.c > > @@ -264,7 +264,7 @@ u32 tpm2_nv_define_space(struct udevice *dev, u32 > space_index, > > * chunks below. > > */ > > const int platform_len = sizeof(u32); > > - const int session_hdr_len = 13; > > + const int session_hdr_len = 15; > > const int message_len = 14; > > uint offset = TPM2_HDR_LEN + platform_len + session_hdr_len + > > message_len; > > @@ -277,11 +277,12 @@ u32 tpm2_nv_define_space(struct udevice *dev, u32 > space_index, > > /* handles 4 bytes */ > > tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */ > > > > - /* session header 13 bytes */ > > + /* session header 15 bytes */ > > tpm_u32(9), /* Header size */ > > tpm_u32(TPM2_RS_PW), /* Password authorisation > */ > > tpm_u16(0), /* nonce_size */ > > 0, /* session_attrs */ > > + tpm_u16(0), /* HMAC size */ > > tpm_u16(0), /* auth_size */ > > > > /* message 14 bytes + policy */ > > -- > > 2.43.0 > >
