On Mon, 2025-12-01 at 15:03 +0530, Harshit Mogalapalli wrote:
Hi all,
On 13/11/25 01:00, Harshit Mogalapalli wrote:
When the second-stage kernel is booted via kexec with a limiting command line such as "mem=<size>", the physical range that contains the carried over IMA measurement list may fall outside the truncated RAM leading to a kernel panic.
BUG: unable to handle page fault for address: ffff97793ff47000 RIP: ima_restore_measurement_list+0xdc/0x45a #PF: error_code(0x0000) – not-present pageOther architectures already validate the range with page_is_ram(), as done in commit: cbf9c4b9617b ("of: check previous kernel's ima-kexec-buffer against memory bounds") do a similar check on x86.
It should be obvious that without carrying the measurement list across kexec, that attestation will fail. Please mentioned it here in the patch description.
Cc: stable@vger.kernel.org Fixes: b69a2afd5afc ("x86/kexec: Carry forward IMA measurement log on kexec") Reported-by: Paul Webb paul.x.webb@oracle.com Signed-off-by: Harshit Mogalapalli harshit.m.mogalapalli@oracle.com
Tested-by: Mimi Zohar zohar@linux.ibm.com