Re: [PATCH] ima: Kdump kernel doesn't need IMA to do integrity measurement

steven chen
2025-05-12T14:23:26Z

On 5/2/2025 1:03 PM, steven chen wrote:
> From: Steven Chen <chenste@linux.microsoft.com>
>
> 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.
>
> Signed-off-by: Steven Chen <chenste@linux.microsoft.com>
> ---
> security/integrity/ima/ima_kexec.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> 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,

Could you tell me when will you have time to validate kdump scenario
using this patch?

This patch is based on the next-integrity branch of
https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git/

Thanks,

Steven