ima: Free IMA measurement buffer after kexec syscall
authorLakshmi Ramasubramanian <nramas@linux.microsoft.com>
Thu, 4 Feb 2021 17:49:51 +0000 (09:49 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 4 Mar 2021 10:37:50 +0000 (11:37 +0100)
commitc365d333e97ac80caf39471b37514b8cbe4536e1
tree20ed6d8358d21fb8628d429f65c8d9de30f99147
parent1facf2415b98fd8dbf6f9b3388c3bd654c01154a
ima: Free IMA measurement buffer after kexec syscall

[ Upstream commit f31e3386a4e92ba6eda7328cb508462956c94c64 ]

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@linux.microsoft.com>
Suggested-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Fixes: 7b8589cc29e7 ("ima: on soft reboot, save the measurement list")
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
include/linux/kexec.h
kernel/kexec_file.c
security/integrity/ima/ima_kexec.c