ima: make the kexec extra memory configurable

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 <[email protected]>
Co-developed-by: Tushar Sugandhi <[email protected]>
Signed-off-by: Tushar Sugandhi <[email protected]>
Signed-off-by: Steven Chen <[email protected]>
Reviewed-by: Stefan Berger <[email protected]>
Acked-by: Baoquan He <[email protected]>
Tested-by: Stefan Berger <[email protected]> # ppc64/kvm
Signed-off-by: Mimi Zohar <[email protected]>

0 files changed, 0 insertions, 0 deletions