linux-kernel - Re: [PATCH 1/1] selinux: include sys/socket.h in host programs to have PF

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Date:   Fri, 10 Mar 2017 15:12:24 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Nicolas Iooss <nicolas.iooss@....org>
Cc:     Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>, selinux@...ho.nsa.gov,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] selinux: include sys/socket.h in host programs to
 have PF_MAX

On Sun, Mar 5, 2017 at 9:01 AM, Nicolas Iooss <nicolas.iooss@....org> wrote:
> Compiling with clang and -Wundef makes the compiler report a usage of
> undefined PF_MAX macro in security/selinux/include/classmap.h:
>
>     In file included from scripts/selinux/mdp/mdp.c:48:
>     security/selinux/include/classmap.h:37:31: warning: no previous
>     extern declaration for non-static variable 'secclass_map'
>     [-Wmissing-variable-declarations]
>     struct security_class_mapping secclass_map[] = {
>                                   ^
>     security/selinux/include/classmap.h:235:5: error: 'PF_MAX' is not
>     defined, evaluates to 0 [-Werror,-Wundef]
>     #if PF_MAX > 43
>         ^
>     In file included from scripts/selinux/genheaders/genheaders.c:17:
>     security/selinux/include/classmap.h:37:31: warning: no previous
>     extern declaration for non-static variable 'secclass_map'
>     [-Wmissing-variable-declarations]
>     struct security_class_mapping secclass_map[] = {
>                                   ^
>     security/selinux/include/classmap.h:235:5: error: 'PF_MAX' is not
>     defined, evaluates to 0 [-Werror,-Wundef]
>     #if PF_MAX > 43
>         ^
>
> PF_MAX is defined in include/linux/socket.h but not in
> include/uapi/linux/socket.h. Therefore host programs have to rely on the
> definition from libc's /usr/include/bits/socket.h, included by
> <sys/socket.h>.
>
> Fix the issue by using sys/socket.h in mdp and genheaders. When
> classmap.h is included by security/selinux/avc.c, it uses the kernel
> definition of PF_MAX, which makes the test consistent.
>
> Signed-off-by: Nicolas Iooss <nicolas.iooss@....org>
> ---
>  scripts/selinux/genheaders/genheaders.c | 1 +
>  scripts/selinux/mdp/mdp.c               | 1 +
>  2 files changed, 2 insertions(+)

Merged into selinux/next, thank you.

> diff --git a/scripts/selinux/genheaders/genheaders.c b/scripts/selinux/genheaders/genheaders.c
> index f4dd41f900d5..6a24569c3578 100644
> --- a/scripts/selinux/genheaders/genheaders.c
> +++ b/scripts/selinux/genheaders/genheaders.c
> @@ -8,6 +8,7 @@
>  #include <string.h>
>  #include <errno.h>
>  #include <ctype.h>
> +#include <sys/socket.h>
>
>  struct security_class_mapping {
>         const char *name;
> diff --git a/scripts/selinux/mdp/mdp.c b/scripts/selinux/mdp/mdp.c
> index c29fa4a6228d..ffe8179f5d41 100644
> --- a/scripts/selinux/mdp/mdp.c
> +++ b/scripts/selinux/mdp/mdp.c
> @@ -32,6 +32,7 @@
>  #include <stdlib.h>
>  #include <unistd.h>
>  #include <string.h>
> +#include <sys/socket.h>
>
>  static void usage(char *name)
>  {
> --
> 2.11.1
>



-- 
paul moore
www.paul-moore.com