On Thu, 2017-11-02 at 22:04 +0000, David Howells wrote:

Mimi Zohar [off-list ref] wrote:

quoted

quoted

Only validly signed device firmware may be loaded.

fw_get_filesystem_firmware() calls kernel_read_file_from_path() to
read the firmware, which calls into the security hooks. Is there
another place that validates the firmware signatures. ?I'm not seeing
which patch requires firmware to be signed?

Luis has a set of patches for this.  However, I'm not sure if that's going
anywhere at the moment.  Possibly I should remove this from the manpage for
the moment.

Or reflect that IMA-appraisal, if enabled, will enforce firmware being
validly signed.

Mimi

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