stable inclusion
from stable-5.10.20
commit c365d333e97ac80caf39471b37514b8cbe4536e1
bugzilla: 50608

--------------------------------

[ Upstream commit f31e3386 ]

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: NLakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: NTyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: NThiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: NTyler Hicks <tyhicks@linux.microsoft.com>
Fixes: 7b8589cc ("ima: on soft reboot, save the measurement list")
Signed-off-by: NMimi Zohar <zohar@linux.ibm.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>