On Fri, 2020-06-05 at 11:15 -0700, Scott Branden wrote:
> Hi Mimi,
>
> On 2020-05-23 7:52 p.m., Mimi Zohar wrote:
> > Scott, the change should be straight forward. The additional patch
> > needs to:
> > - define a new kernel_read_file_id enumeration, like
> > FIRMWARE_PARTIAL_READ.
> > - Currently ima_read_file() has a comment about pre-allocated firmware
> > buffers. Update ima_read_file() to call process_measurement() for the
> > new enumeration FIRMWARE_PARTIAL_READ and update ima_post_read_file()
> > to return immediately.
> Should this be what is in ima_read_file?
> {
> enum ima_hooks func;
> u32 secid;
Please don't remove the existing comment.
> if (read_id != READING_FIRMWARE_PARTIAL_READ)
> return 0;
>
> if (!file) { /* should never happen */
> if (ima_appraise & IMA_APPRAISE_ENFORCE)
> return -EACCES;
> return 0;
> }
This checks for any IMA appraise rule. You want to enforce firmware
signature checking only if there is a firmware appraise rule. Refer
to ima_post_read_file().
> security_task_getsecid(current, &secid);
> return process_measurement(file, current_cred(), secid, NULL,
> 0, MAY_READ, FILE_CHECK);
The read_idmap enumeration should be updated similar to the other
firmware. Keep the code generic. Refer to ima_post_read_file().
func will be defined as FIRMWARE_CHECK.
thanks,
Mimi
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