linux-kernel - Re: [PATCH] TPM: Fixup pubek sysfs file

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Date:	Fri, 4 Sep 2009 15:23:16 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roland Dreier <rdreier@...co.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	srajiv@...ux.vnet.ibm.com, debora@...ux.vnet.ibm.com,
	m.selhorst@...rix.com, jmorris@...ei.org, jbeulich@...ell.com
Subject: Re: [PATCH] TPM: Fixup pubek sysfs file

On Fri, Sep 04, 2009 at 02:03:25PM -0700, Andrew Morton wrote:
> On Thu, 03 Sep 2009 22:02:24 -0700
> Roland Dreier <rdreier@...co.com> wrote:
> 
> > 
> >  > Algorithm: 00 00 00 01
> >  > Encscheme: 00 03
> >  > Sigscheme: 00 01
> >  > Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
> >  > Modulus length: 256
> > 
> > No argument that this fix is an improvement, but what happened to the
> > "one value per file" rule for sysfs??
> 
> We goofed.  This one snuck through.
> 
> It's one of the reasons why I recommend that people cite examples of
> the sysfs/procfs output in changelogs.  These things are part of the
> kernel ABI and once they go in we cannot change them so we have to get
> them right first time.

Several of the sysfs files in the TPM driver are goofed:

/sys/devices/platform/tpm_tis.0 # cat caps
Manufacturer: 0x57454300
TCG version: 1.2
Firmware version: 2.16

/sys/devices/platform/tpm_tis.0 # cat pcrs 
PCR-00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-01: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-02: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-03: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-04: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-05: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-06: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-07: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-08: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-09: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-11: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-12: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-13: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-14: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-15: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-16: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
PCR-17: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
PCR-18: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
PCR-19: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
PCR-20: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
PCR-21: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
PCR-22: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
PCR-23: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 

/sys/devices/platform/tpm_tis.0 # cat pubek
Algorithm: 00 00 00 01
Encscheme: 00 03
Sigscheme: 00 01
Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
Modulus length: 256
Modulus: 
AF 6B 30 9B 0D B3 B4 7D 74 35 68 45 8D CA A5 EF 
A8 8A DD 0F D7 84 8E 8D 1F 40 22 92 09 CF 12 C8 
9F 6E 55 57 6A 2C A8 0B 5E 45 C7 5E 3D 56 DA 64 
E6 E1 F7 8C DD 41 92 28 2E 06 41 02 3E 11 7D B2 
C5 46 38 E5 8C 60 D2 96 EE 0C D6 3D F8 99 E3 02 
3A 32 7A 02 C8 31 29 98 28 B9 1B EF 30 A1 A0 45 
A0 C0 05 0E C5 96 95 FD 91 47 0A 35 E0 69 B0 8B 
49 BD B9 F6 5D 25 21 25 79 1B 20 0D C3 C7 1F 87 
5E 5F 41 4B DE 32 DF 55 F3 BD 7F CA D8 7D 3A B4 
D5 0A EF CF 8E 72 20 52 15 FA FB C6 C0 2E C2 AB 
C6 07 D0 9D 96 6B 2E 30 F7 54 C4 A5 CD 9B 13 54 
A0 D1 71 66 91 97 06 12 B5 2D B2 33 62 FB 56 62 
64 A8 AA E9 F2 F4 03 C3 F4 49 2A 09 0D 7D 75 99 
6C F0 47 1E 7D D5 A5 CA CE EF 45 B2 DA 88 93 B4 
EE EB FB B0 A6 A4 19 C4 B8 0D 04 46 AE BD C5 2E 
30 84 49 57 25 34 78 E6 ED C4 50 AF 3B F6 86 43 

At least this has been like this since before the git history, so it
isn't recent..

Can these be scheduled for removal or some such process? I haven't
seen anything actually using the files, the only one that is really
useful is caps...

They probably should have been in debugfs, had it existed at the time.

Thanks,
Jason
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