On Wed, Jan 27, 2021 at 09:03:59AM -0500, Mimi Zohar wrote: > [Cc'ing linux-integrity] > > On Wed, 2021-01-27 at 11:46 +0000, David Howells wrote: > > Jarkko Sakkinen <jar...@kernel.org> wrote: > > > > > > I suppose a user space tool could be created. But wouldn’t what is > > > > currently done in the kernel in this area need to be removed? > > > > > > Right. I don't think this was a great idea in the first place to > > > do to the kernel but since it exists, I guess the patch does make > > > sense. > > > > This information needs to be loaded from the UEFI tables before the system > > starts loading any kernel modules or running any programs (if we do > > verification of such, which I think IMA can do). > > There needs to a clear distinction between the pre-boot and post-boot > keys. UEFI has its own trust model, which should be limited to UEFI. > The .platform keyring was upstreamed and limited to verifying the kexec > kernel image. Any other usage of the .platform keyring keys is > abusing its intended purpose. > > The cover letter says, "Anytime the .platform keyring is used, the > keys in the .blacklist keyring are referenced, if a matching key is > found, the key will be rejected." I don't have a problem with loading > the UEFI X509 dbx entries as long as its usage is limited to verifying > the kexec kernel image. > > Mimi
Thanks Mimi, this is a valid argument. I agree. /Jarkko
