Re: [PATCH 2/2] ima: Free IMA measurement buffer after kexec syscall

From: Thiago Jung Bauermann
Date: Fri Jan 22 2021 - 17:33:55 EST

Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx> writes:

> IMA allocates kernel virtual memory to carry forward the measurement
> list, from the current kernel to the next kernel on kexec system call,
> in ima_add_kexec_buffer() function. This buffer is not freed before
> completing the kexec system call resulting in memory leak.
> Add ima_buffer field in "struct kimage" to store the virtual address
> of the buffer allocated for the IMA measurement list.
> Free the memory allocated for the IMA measurement list in
> kimage_file_post_load_cleanup() function.
> Signed-off-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
> Suggested-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx>
> Fixes: 7b8589cc29e7 ("ima: on soft reboot, save the measurement list")

Good catch.

Reviewed-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>

Thiago Jung Bauermann
IBM Linux Technology Center