[PATCH v13 0/9] ima: kexec: measure events between kexec load and execute

[steven chen]

On 4/24/2025 7:37 AM, Baoquan He wrote:
> Hi Steven,
>
> Could you test below code and post a formal patch to not copy
> measurement list buffer to kdump kernel? Below log is just for your
> reference, please feel free to modify or rephrase.
>
> ===
> Kdump kernel doesn't need IMA to do integrity measurement.
> Hence the measurement list in 1st kernel doesn't need to be copied to
> kdump kenrel.
>
> Here skip allocating buffer for measurement list copying if loading
> kdump kernel. Then there won't be the later handling related to
> ima_kexec_buffer.
> ===
>
> diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
> index 38cb2500f4c3..7362f68f2d8b 100644
> --- a/security/integrity/ima/ima_kexec.c
> +++ b/security/integrity/ima/ima_kexec.c
> @@ -146,6 +146,9 @@ void ima_add_kexec_buffer(struct kimage *image)
>   	void *kexec_buffer = NULL;
>   	int ret;
>   
> +	if (image->type == KEXEC_TYPE_CRASH)
> +		return;
> +
>   	/*
>   	 * Reserve extra memory for measurements added during kexec.
>   	 */
>
Hi Baoquan,

I tested the kernel with above change. Normal soft reboot works fine.

I will post the patch for review.

Please make sure to test KDump scenario.

Thanks,

Steven