[lkml]   [2017]   [Oct]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 07/27] kexec_file: Disable at runtime if securelevel has been set
[Cc'ing Matthew Garrett]

On Thu, 2017-10-26 at 16:02 +0100, David Howells wrote:
> joeyli <> wrote:
> > + !is_ima_appraise_enabled() &&
> > + kernel_is_locked_down("kexec of unsigned images"))
> This doesn't seem right. It seems that you can then kexec unsigned images
> into a locked-down kernel if IMA appraise is enabled.

Huh?!  With the "secure_boot" policy enabled on the boot command line,
IMA-appraisal would verify the kexec kernel image, firmware, kernel
modules, and custom IMA policy signatures.  With the "ima: require
secure_boot rules in lockdown mode" patch, the "lockdown" mode would
enable IMA-appraisal's secure_boot policy, without requiring the boot
command line option.  It would also add the secure_boot rules to the
custom policy, so that if the builtin policy is replaced with a custom
policy, the "secure_boot" policy would still be enforced.

Other patches in this patch series need to be updated as well to check
if IMA-appraisal is enabled.


 \ /
  Last update: 2017-10-26 17:47    [W:0.196 / U:3.312 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site