linux-kernel - Re: [PATCH V8 3/3] Call ima_kexec_cmdline to measure the cmdline args

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Date:   Wed, 12 Jun 2019 18:31:43 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Prakhar Srivastava <prsriva02@...il.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     roberto.sassu@...wei.com, vgoyal@...hat.com,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Dave Young <dyoung@...hat.com>,
        kexec <kexec@...ts.infradead.org>
Subject: Re: [PATCH V8 3/3] Call ima_kexec_cmdline to measure the cmdline
 args

[Cc: kexec mailing list]

Hi Eric, Dave,

On Wed, 2019-06-12 at 15:15 -0700, Prakhar Srivastava wrote:
> During soft reboot(kexec_file_load) boot cmdline args
> are not measured.Thus the new kernel on load boots with
> an assumption of cold reboot.
> 
> This patch makes a call to the ima hook ima_kexec_cmdline,
> added in "Define a new IMA hook to measure the boot command
> line arguments"
> to measure the boot cmdline args into the ima log.
> 
> - call ima_kexec_cmdline from kexec_file_load.
> - move the call ima_add_kexec_buffer after the cmdline
> args have been measured.
> 
> Signed-off-by: Prakhar Srivastava <prsriva02@...il.com>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Dave Young <dyoung@...hat.com>

Any chance we could get some Acks?

thanks,

Mimi

> ---
>  kernel/kexec_file.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> index 072b6ee55e3f..b0c724e5d86c 100644
> --- a/kernel/kexec_file.c
> +++ b/kernel/kexec_file.c
> @@ -198,9 +198,6 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
>  		return ret;
>  	image->kernel_buf_len = size;
>  
> -	/* IMA needs to pass the measurement list to the next kernel. */
> -	ima_add_kexec_buffer(image);
> -
>  	/* Call arch image probe handlers */
>  	ret = arch_kexec_kernel_image_probe(image, image->kernel_buf,
>  					    image->kernel_buf_len);
> @@ -241,8 +238,14 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
>  			ret = -EINVAL;
>  			goto out;
>  		}
> +
> +		ima_kexec_cmdline(image->cmdline_buf,
> +				  image->cmdline_buf_len - 1);
>  	}
>  
> +	/* IMA needs to pass the measurement list to the next kernel. */
> +	ima_add_kexec_buffer(image);
> +
>  	/* Call arch image load handlers */
>  	ldata = arch_kexec_kernel_image_load(image);
>