linux-kernel - Re: [PATCH v2] Add a header in ifcfg and nm keyfiles describing the owner of the files

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Message-ID: <20240419165433.GB506@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Fri, 19 Apr 2024 09:54:33 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Ani Sinha <anisinha@...hat.com>
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	eahariha@...ux.microsoft.com, linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Add a header in ifcfg and nm keyfiles describing the
 owner of the files

On Thu, Apr 18, 2024 at 05:35:49PM +0530, Ani Sinha wrote:
> A comment describing the source of writing the contents of the ifcfg and
> network manager keyfiles (hyperv kvp daemon) is useful. It is valuable both
> for debugging as well as for preventing users from modifying them.
> 
> CC: shradhagupta@...ux.microsoft.com
> CC: eahariha@...ux.microsoft.com
> CC: wei.liu@...nel.org
> Signed-off-by: Ani Sinha <anisinha@...hat.com>
> ---
>  tools/hv/hv_kvp_daemon.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> changelog:
> v2: simplify and fix issues with error handling.
> 
> diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
> index ae57bf69ad4a..014e45be6981 100644
> --- a/tools/hv/hv_kvp_daemon.c
> +++ b/tools/hv/hv_kvp_daemon.c
> @@ -94,6 +94,8 @@ static char *lic_version = "Unknown version";
>  static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
>  static struct utsname uts_buf;
>  
> +#define CFG_HEADER "# Generated by hyperv key-value pair daemon. Please do not modify.\n"
> +
>  /*
>   * The location of the interface configuration file.
>   */
> @@ -1435,6 +1437,18 @@ static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
>  		return HV_E_FAIL;
>  	}
>  
> +	/* Write the config file headers */
> +	error = fprintf(ifcfg_file, CFG_HEADER);
> +	if (error < 0) {
> +		error = HV_E_FAIL;
> +		goto setval_error;
> +	}
> +	error = fprintf(nmfile, CFG_HEADER);
> +	if (error < 0) {
> +		error = HV_E_FAIL;
> +		goto setval_error;
> +	}
> +
>  	/*
>  	 * First write out the MAC address.
>  	 */
> -- 
> 2.42.0
Reviewed-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>