Messages in this thread | | | Subject | Re: [PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled | From | Mimi Zohar <> | Date | Mon, 21 Nov 2022 13:23:57 -0500 |
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Hi Coiby,
On Mon, 2022-11-21 at 15:29 +0800, Coiby Xu wrote: > A kernel builder may not enable KEXEC_SIG and some architectures like > ppc64 simply don't have KEXEC_SIG. In these cases, unless both > IMA_ARCH_POLICY and secure boot also enabled, lockdown doesn't prevent > unsigned kernel image from being kexec'ed via the kexec_file_load > syscall whereas it could prevent one via the kexec_load syscall. Mandate > signature verification for those cases. > > Fixes: 155bdd30af17 ("kexec_file: Restrict at runtime if the kernel is locked down") > Cc: Matthew Garrett <mjg59@srcf.ucam.org> > Cc: Jiri Bohac <jbohac@suse.cz> > Cc: David Howells <dhowells@redhat.com> > Cc: kexec@lists.infradead.org > Cc: linux-integrity@vger.kernel.org > Signed-off-by: Coiby Xu <coxu@redhat.com>
Other than correcting the function name to mandate_signature_verificati on(),
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
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