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SubjectRe: [PATCH v2 2/2] ima: Free IMA measurement buffer after kexec syscall
On Thu, Feb 04, 2021 at 09:49:51AM -0800, Lakshmi Ramasubramanian wrote:
> 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")
> ---
> include/linux/kexec.h | 5 +++++
> kernel/kexec_file.c | 5 +++++
> security/integrity/ima/ima_kexec.c | 2 ++
> 3 files changed, 12 insertions(+)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>

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