Re: Failed to open device file /dev/tpm0: Permission denied

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On Sun, Jan 13, 2019 at 11:36:24AM -0800, Samuel Sieb wrote:
> On 1/13/19 9:22 AM, Dave Mitchell wrote:
> > journalctl -f shows the following lines appearing in the log every five
> > seconds.  Can anyone tell me whether this is important, and if so how to
> > fix it, and if not, how to stop this noise filling the journal up?
> 
> That's the tpm2-abrmd package.  I don't know what brings that in, I don't
> have it.

Thanks.

The package description leaves me none the wiser:

# rpm -qi tpm2-abrmd
...
URL         : https://github.com/tpm2-software/tpm2-abrmd
Bug URL     : https://bugz.fedoraproject.org/tpm2-abrmd
Summary     : A system daemon implementing TPM2 Access Broker and Resource Manager
Description :
tpm2-abrmd is a system daemon implementing the TPM2 access broker (TAB) and
Resource Manager (RM) spec from the TCG.



# dnf remove tpm2-abrmd
Dependencies resolved.
================================================================================
 Package                  Arch   Version                         Repository
                                                                           Size
================================================================================
Removing:
 tpm2-abrmd               x86_64 2.0.3-2.fc29                    @updates 498 k
Removing unused dependencies:
 checkpolicy              x86_64 2.8-2.fc29                      @fedora  1.4 M
 policycoreutils-python-utils
                          noarch 2.8-8.fc29                      @fedora  116 k
 python3-IPy              noarch 0.81-23.fc29                    @fedora  123 k
 python3-audit            x86_64 3.0-0.5.20181218gitbdb72c0.fc29 @updates 326 k
 python3-libsemanage      x86_64 2.8-4.fc29                      @fedora  441 k
 python3-policycoreutils  noarch 2.8-8.fc29                      @fedora  5.1 M
 python3-setools          x86_64 4.1.1-13.fc29                   @fedora  1.8 M
 tpm2-abrmd-selinux       noarch 2.0.0-2.fc29                    @fedora   11 k
...
Is this ok [y/N]: n

> As root, can you do "cat /dev/tpm0"?

Yep, it gives zero-length output.

    # cat /dev/tpm0
    # cat /dev/tpm0 | wc
          0       0       0
    #

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