Re: [PATCH v13 0/9] ima: kexec: measure events between kexec load and execute

[Baoquan He <bhe@redhat.com>]

On 05/02/25 at 09:25am, steven chen wrote:
> On 4/24/2025 7:37 AM, Baoquan He wrote:
> > Hi Steven,
> > 
> > Could you test below code and post a formal patch to not copy
> > measurement list buffer to kdump kernel? Below log is just for your
> > reference, please feel free to modify or rephrase.
> > 
> > ===
> > Kdump kernel doesn't need IMA to do integrity measurement.
> > Hence the measurement list in 1st kernel doesn't need to be copied to
> > kdump kenrel.
> > 
> > Here skip allocating buffer for measurement list copying if loading
> > kdump kernel. Then there won't be the later handling related to
> > ima_kexec_buffer.
> > ===
> > 
> > diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
> > index 38cb2500f4c3..7362f68f2d8b 100644
> > --- a/security/integrity/ima/ima_kexec.c
> > +++ b/security/integrity/ima/ima_kexec.c
> > @@ -146,6 +146,9 @@ void ima_add_kexec_buffer(struct kimage *image)
> >   	void *kexec_buffer = NULL;
> >   	int ret;
> > +	if (image->type == KEXEC_TYPE_CRASH)
> > +		return;
> > +
> >   	/*
> >   	 * Reserve extra memory for measurements added during kexec.
> >   	 */
> > 
> Hi Baoquan,
> 
> I tested the kernel with above change. Normal soft reboot works fine.
> 
> I will post the patch for review.

Just come back from Labor Day public holiday. I went through the code
flow, the code should be fine. I will test it by checking the setup_data
if IMA data is excluded in kdump case.