On Tue, 2025-02-18 at 14:55 -0800, steven chen wrote:

The extra memory allocated for carrying the IMA measurement list across
kexec is hard-coded as half a PAGE.  Make it configurable.

Define a Kconfig option, IMA_KEXEC_EXTRA_MEMORY_KB, to configure the
extra memory (in kb) to be allocated for IMA measurements added during
kexec soft reboot.  Ensure the default value of the option is set such
that extra half a page of memory for additional measurements is allocated
for the additional measurements.

Update ima_add_kexec_buffer() function to allocate memory based on the
Kconfig option value, rather than the currently hard-coded one.

Suggested-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Tushar Sugandhi <redacted>
Signed-off-by: steven chen <redacted>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>

Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>