Re: [RFC PATCH ghak86 V1] audit: eliminate audit_enabled magic number comparison

[Paul Moore]

On Tue, Jun 5, 2018 at 7:20 PM, Richard Guy Briggs <rgb@xxxxxxxxxx> wrote:
> Remove comparison of audit_enabled to magic numbers outside of audit.
>
> Related: https://github.com/linux-audit/audit-kernel/issues/86
>
> Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
> ---
>  drivers/tty/tty_audit.c      | 2 +-
>  include/linux/audit.h        | 5 ++++-
>  include/net/xfrm.h           | 2 +-
>  kernel/audit.c               | 3 ---
>  net/netfilter/xt_AUDIT.c     | 2 +-
>  net/netlabel/netlabel_user.c | 2 +-
>  6 files changed, 8 insertions(+), 8 deletions(-)

An improvement, thank you.  Thankfully there are no tariffs on patches
so I've queued this up for after the merge window.

> diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
> index e30aa6b..50f567b 100644
> --- a/drivers/tty/tty_audit.c
> +++ b/drivers/tty/tty_audit.c
> @@ -92,7 +92,7 @@ static void tty_audit_buf_push(struct tty_audit_buf *buf)
>  {
>         if (buf->valid == 0)
>                 return;
> -       if (audit_enabled == 0) {
> +       if (audit_enabled == AUDIT_OFF) {
>                 buf->valid = 0;
>                 return;
>         }
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index 69c7847..9334fbe 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -117,6 +117,9 @@ struct audit_field {
>
>  extern void audit_log_session_info(struct audit_buffer *ab);
>
> +#define AUDIT_OFF      0
> +#define AUDIT_ON       1
> +#define AUDIT_LOCKED   2
>  #ifdef CONFIG_AUDIT
>  /* These are defined in audit.c */
>                                 /* Public API */
> @@ -202,7 +205,7 @@ static inline int audit_log_task_context(struct audit_buffer *ab)
>  static inline void audit_log_task_info(struct audit_buffer *ab,
>                                        struct task_struct *tsk)
>  { }
> -#define audit_enabled 0
> +#define audit_enabled AUDIT_OFF
>  #endif /* CONFIG_AUDIT */
>
>  #ifdef CONFIG_AUDIT_COMPAT_GENERIC
> diff --git a/include/net/xfrm.h b/include/net/xfrm.h
> index 7f2e31a..ce995a1 100644
> --- a/include/net/xfrm.h
> +++ b/include/net/xfrm.h
> @@ -734,7 +734,7 @@ static inline struct audit_buffer *xfrm_audit_start(const char *op)
>  {
>         struct audit_buffer *audit_buf = NULL;
>
> -       if (audit_enabled == 0)
> +       if (audit_enabled == AUDIT_OFF)
>                 return NULL;
>         audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
>                                     AUDIT_MAC_IPSEC_EVENT);
> diff --git a/kernel/audit.c b/kernel/audit.c
> index e7478cb..8442c65 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -83,9 +83,6 @@
>  #define AUDIT_INITIALIZED      1
>  static int     audit_initialized;
>
> -#define AUDIT_OFF      0
> -#define AUDIT_ON       1
> -#define AUDIT_LOCKED   2
>  u32            audit_enabled = AUDIT_OFF;
>  bool           audit_ever_enabled = !!AUDIT_OFF;
>
> diff --git a/net/netfilter/xt_AUDIT.c b/net/netfilter/xt_AUDIT.c
> index f368ee6..af883f1 100644
> --- a/net/netfilter/xt_AUDIT.c
> +++ b/net/netfilter/xt_AUDIT.c
> @@ -72,7 +72,7 @@ static bool audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
>         struct audit_buffer *ab;
>         int fam = -1;
>
> -       if (audit_enabled == 0)
> +       if (audit_enabled == AUDIT_OFF)
>                 goto errout;
>         ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
>         if (ab == NULL)
> diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
> index 2f328af..4676f5b 100644
> --- a/net/netlabel/netlabel_user.c
> +++ b/net/netlabel/netlabel_user.c
> @@ -101,7 +101,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
>         char *secctx;
>         u32 secctx_len;
>
> -       if (audit_enabled == 0)
> +       if (audit_enabled == AUDIT_OFF)
>                 return NULL;
>
>         audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);
> --
> 1.8.3.1
>



-- 
paul moore
www.paul-moore.com