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

Eugene Syromiatnikov
2018-09-10T02:45:28Z

On Tue, Aug 28, 2018 at 04:34:04PM -0700, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@infradead.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@infradead.org>
> Cc: David Howells <dhowells@redhat.com>
> Cc: James Morris <jmorris@namei.org>
> Cc: "Serge E. Hallyn" <serge@hallyn.com>
> Cc: keyrings@vger.kernel.org
> Cc: linux-security-module@vger.kernel.org
> Cc: Mat Martineau <mathew.j.martineau@linux.intel.com>
> Cc: stable@vger.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;
>
>