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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
	Mimi Zohar <zohar@linux.ibm.com>,
	linux-integrity@vger.kernel.org
Subject: Re: [PATCH v4 1/1] tpm: add sysfs exports for all banks of PCR registers
Date: Tue, 25 Aug 2020 18:27:39 +0300	[thread overview]
Message-ID: <20200825152739.GA8518@linux.intel.com> (raw)
In-Reply-To: <1598300446.4034.5.camel@HansenPartnership.com>

On Mon, Aug 24, 2020 at 01:20:46PM -0700, James Bottomley wrote:
> On Mon, 2020-08-24 at 22:44 +0300, Jarkko Sakkinen wrote:
> > On Fri, Aug 21, 2020 at 04:38:47PM -0300, Jason Gunthorpe wrote:
> > > On Thu, Aug 20, 2020 at 09:14:44AM -0700, James Bottomley wrote:
> > > 
> > > > > eg we can't do it because we can't access /dev/tpm for
> > > > > permissions or
> > > > > something.
> > > > 
> > > > I already said that: we can't it's root.root 0600 currently.  All
> > > > the TSSs seem to change at least /dev/tpmrm to tpm.tpm 0660 but
> > > > we can't do that in the kernel because there's no fixed tpm
> > > > uid/gid.
> > > 
> > > Permissions is a pretty good reason to add a sysfs file.
> > > 
> > > Jason
> > 
> > I'm not sure why suid/sgid utility to read pcrs would be worse.
> 
> We don't do root running or suid/sgid binaries any more because they're
> exceptional security risks.  That's why both TSSs for TPM 2.0 change
> the device ownership.  For Trousers and TPM 1.2 we used to run the
> daemon as root until we started getting CVEs about it.
> 
> James

OK, then a binary blob for pcrs would be sufficient.

/Jarkko

  reply	other threads:[~2020-08-25 15:27 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-17 21:35 [PATCH v4 0/1] add sysfs exports for TPM 2 PCR registers James Bottomley
2020-08-17 21:35 ` [PATCH v4 1/1] tpm: add sysfs exports for all banks of " James Bottomley
2020-08-18 16:12   ` Jarkko Sakkinen
2020-08-18 16:19     ` Jarkko Sakkinen
2020-08-18 16:26       ` Jarkko Sakkinen
2020-08-18 16:46         ` Jason Gunthorpe
2020-08-18 18:26           ` Mimi Zohar
2020-08-18 18:36             ` Jason Gunthorpe
2020-08-18 18:55               ` Mimi Zohar
2020-08-19 12:02                 ` Jason Gunthorpe
2020-08-19 13:27                   ` Mimi Zohar
2020-08-19 14:09                     ` Jason Gunthorpe
2020-08-19 14:53                       ` Mimi Zohar
2020-08-19 14:55                         ` Mimi Zohar
2020-08-19 22:16                         ` Jarkko Sakkinen
2020-08-19 22:48                           ` Jerry Snitselaar
2020-08-19 23:26                             ` Jason Gunthorpe
2020-08-20 15:46                             ` Jarkko Sakkinen
2020-08-19 14:56                       ` Serge E. Hallyn
2020-08-19 22:15                     ` Jarkko Sakkinen
2020-08-19 15:17                   ` James Bottomley
2020-08-19 16:18                     ` Jason Gunthorpe
2020-08-19 16:57                       ` Mimi Zohar
2020-08-19 17:17                         ` Jason Gunthorpe
2020-08-19 20:09                           ` James Bottomley
2020-08-19 23:21                             ` Jason Gunthorpe
2020-08-20 16:14                               ` James Bottomley
2020-08-20 16:55                                 ` Serge E. Hallyn
2020-08-21 17:41                                 ` Jarkko Sakkinen
2020-08-21 19:38                                 ` Jason Gunthorpe
2020-08-24 19:44                                   ` Jarkko Sakkinen
2020-08-24 20:20                                     ` James Bottomley
2020-08-25 15:27                                       ` Jarkko Sakkinen [this message]
2020-08-25 15:33                                         ` James Bottomley
2020-08-26 13:15                                           ` Jarkko Sakkinen
2020-08-26 13:19                                             ` Jarkko Sakkinen
2020-08-24 21:57                                     ` Jason Gunthorpe
2020-08-19 22:14                 ` Jarkko Sakkinen
2020-08-18 19:03               ` James Bottomley
2020-08-19 22:13               ` Jarkko Sakkinen
2020-08-19 22:01             ` Jarkko Sakkinen
2020-08-18 16:44       ` James Bottomley
2020-08-18 17:17         ` Jason Gunthorpe
2020-08-18 18:49           ` James Bottomley
2020-08-19 21:53             ` Jarkko Sakkinen
2020-08-19 22:46               ` James Bottomley
2020-08-20 15:22                 ` Jarkko Sakkinen
2020-08-19 21:33         ` Jarkko Sakkinen
2020-09-14 17:41   ` Jarkko Sakkinen
2020-09-14 19:19     ` James Bottomley
2020-09-15 11:22       ` Jarkko Sakkinen
2020-10-08 11:45   ` Petr Vorel
2020-10-08 14:29     ` James Bottomley
2020-10-09 16:12     ` Jarkko Sakkinen

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