Re: [PATCH 1/2] ima: Free IMA measurement buffer on error

[Tyler Hicks]

On 2021-01-21 09:30:02, 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.  In error code paths this memory
> is not freed resulting in memory leak.
> 
> Free the memory allocated for the IMA measurement list in
> the error code paths in ima_add_kexec_buffer() function.
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
> Suggested-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx>
> Fixes: 7b8589cc29e7 ("ima: on soft reboot, save the measurement list")

Reviewed-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx>

Tyler

> ---
>  security/integrity/ima/ima_kexec.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
> index 121de3e04af2..212145008a01 100644
> --- a/security/integrity/ima/ima_kexec.c
> +++ b/security/integrity/ima/ima_kexec.c
> @@ -119,12 +119,14 @@ void ima_add_kexec_buffer(struct kimage *image)
>  	ret = kexec_add_buffer(&kbuf);
>  	if (ret) {
>  		pr_err("Error passing over kexec measurement buffer.\n");
> +		vfree(kexec_buffer);
>  		return;
>  	}
>  
>  	ret = arch_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
>  	if (ret) {
>  		pr_err("Error passing over kexec measurement buffer.\n");
> +		vfree(kexec_buffer);
>  		return;
>  	}
>  
> -- 
> 2.30.0
>