[LTP] [PATCH 1/2] IMA: Verify that the kernel cmdline is passed and measured correctly through the kexec barrier.

[Mimi Zohar]

On Wed, 2020-07-15 at 15:38 -0400, Lachlan Sneff wrote:
> On 7/14/20 8:58 PM, Mimi Zohar wrote:
> > On Thu, 2020-07-02 at 11:35 -0400, Lachlan Sneff wrote:
> >> Add a testcase that verifies that kexec correctly logs the
> >> kernel command line to the IMA buffer and that the command
> >> line is then correctly measured.
> >>
> >> This test must be run standalone, since it runs kexec
> >> multiple times (and therefore reboots several times).
> > Verifying the kexec boot command line doesn't require rebooting.  Just
> > loading the kexec kernel image should be enough (kexec -s -l).
> >   Verifying that the measurement list, including the kexec boot command
> > line, is carried across kexec could be a separate test.
> 
> This is true. However, it only appends to the IMA log once, even if you 
> unload (`kexec -u`) the kexec kernel after `kexec -s -l ...`.
> 
> Therefore, the test would only be able to check kexec with the cmdline 
> supplied in one way.
> 
> I will have to check internally if that's the right way to go. If it 
> didn't need to reboot, then the test could be integrated into the normal 
> IMA tests,
> which would definitely be a good thing.

For files, there is a single measurement unless the file changes.  I
would assume that would be the same for the kexec command line as
well.  You could modify the command line a bit to force it to be re-
measured.

Mimi