Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1565383

Re: [PATCH RFC] tpm: define a command filter

Show all headers | View raw

On Tue, Jan 24, 2017 at 02:02:52AM +0200, Jarkko Sakkinen wrote:
> This commit adds a command filter for whitelisting a set of commands in
> a TPM space. When a TPM space is created through /dev/tpms0, no
> commands are allowed. The user of the TPM space must explicitly define
> the list of commands allowed before sending any commands. This ioctl is
> a one shot call so that a resource manager daemon can call it before
> sending the file descriptor to the client.

I don't think it makes sense to have a daemon in user space that
passes an open'd /dev/tpms0 FD directly to a client..

It is trivial and more powerful to just proxy the messages. Can you
see some reason why passing a FD through a daemon would make sense?

The earlier discussion with James was to have some way to apply a
global command filter to all tpms0 users with the idea that the
'right' restricted command set would enable a 0666 cdev node, and no
daemon.

> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> 1. This patch applies on top of 'tabrm4' brach.
> 2. Only compilation is tested (just drafted the idea)
>  drivers/char/tpm/tpm-interface.c | 12 +++++--
>  drivers/char/tpm/tpm.h           |  1 +
>  drivers/char/tpm/tpm2-space.c    |  7 ++++
>  drivers/char/tpm/tpms-dev.c      | 75 ++++++++++++++++++++++++++++++++++++++++
>  include/uapi/linux/tpms.h        | 29 ++++++++++++++++

BTW, don't forget to update kbuild when you add uapi files... Applies
to other patches..

Jason

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH RFC] tpm: define a command filter Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-24 01:10 +0100
  Re: [PATCH RFC] tpm: define a command filter Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-01-24 01:20 +0100
    Re: [PATCH RFC] tpm: define a command filter Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-24 15:40 +0100
      Re: [PATCH RFC] tpm: define a command filter Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-01-24 20:10 +0100
        Re: [PATCH RFC] tpm: define a command filter Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-25 21:30 +0100
          Re: [PATCH RFC] tpm: define a command filter Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-01-25 23:20 +0100
            Re: [PATCH RFC] tpm: define a command filter Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-26 12:20 +0100
              Re: [PATCH RFC] tpm: define a command filter Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-01-26 19:10 +0100
                Re: [PATCH RFC] tpm: define a command filter Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-27 07:50 +0100

csiph-web