linux-kernel - Re: [PATCH resend] uapi/linux/keyctl.h: don't use C++ reserved keyword as a struct member name

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Date:   Mon, 10 Sep 2018 00:00:18 +0200
From:   Eugene Syromiatnikov <esyr@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        stable <stable@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH resend] uapi/linux/keyctl.h: don't use C++ reserved
 keyword as a struct member name

On Tue, Aug 28, 2018 at 04:34:04PM -0700, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@...radead.org>
> 
> Since this header is in "include/uapi/linux/", apparently people
> want to use it in userspace programs -- even in C++ ones.
> However, the header uses a C++ reserved keyword ("private"),
> so change that to "dh_private" instead to allow the header file
> to be used in C++ userspace.

This change breaks all existing C programs that rely on <linux/keyctl.h>
uapi header in order to get struct keyctl_dh_params definition, however.

> 
> Fixes https://bugzilla.kernel.org/show_bug.cgi?id=191051
> Fixes: ddbb41148724 ("KEYS: Add KEYCTL_DH_COMPUTE command")
> 
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: David Howells <dhowells@...hat.com>
> Cc: James Morris <jmorris@...ei.org>
> Cc: "Serge E. Hallyn" <serge@...lyn.com>
> Cc: keyrings@...r.kernel.org
> Cc: linux-security-module@...r.kernel.org
> Cc: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> Cc: stable@...r.kernel.org
> ---
>  include/uapi/linux/keyctl.h |    2 +-
>  security/keys/dh.c          |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> --- lnx-416.orig/include/uapi/linux/keyctl.h
> +++ lnx-416/include/uapi/linux/keyctl.h
> @@ -65,7 +65,7 @@
>  
>  /* keyctl structures */
>  struct keyctl_dh_params {
> -	__s32 private;
> +	__s32 dh_private;

>  	__s32 prime;
>  	__s32 base;
>  };
> --- lnx-416.orig/security/keys/dh.c
> +++ lnx-416/security/keys/dh.c
> @@ -307,7 +307,7 @@ long __keyctl_dh_compute(struct keyctl_d
>  	}
>  	dh_inputs.g_size = dlen;
>  
> -	dlen = dh_data_from_key(pcopy.private, &dh_inputs.key);
> +	dlen = dh_data_from_key(pcopy.dh_private, &dh_inputs.key);
>  	if (dlen < 0) {
>  		ret = dlen;
>  		goto out2;
> 
>