Re: [PATCH 4/14] audit: avoid missing-prototype warnings

On May 17, 2023 Arnd Bergmann <[email protected]> wrote:
> 
> Building with 'make W=1' reveals two function definitions without
> a previous prototype in the audit code:
> 
> lib/compat_audit.c:32:5: error: no previous prototype for 'audit_classify_compat_syscall' [-Werror=missing-prototypes]
> kernel/audit.c:1813:14: error: no previous prototype for 'audit_serial' [-Werror=missing-prototypes]
> 
> The first one needs a declaration from linux/audit.h but cannot
> include that header without causing conflicting (compat) syscall number
> definitions, so move the it into linux/audit_arch.h.
> 
> The second one is declared conditionally based on CONFIG_AUDITSYSCALL
> but needed as a local function even when that option is disabled, so
> move the declaration out of the #ifdef block.
> 
> Signed-off-by: Arnd Bergmann <[email protected]>
> ---
>  include/linux/audit.h      | 2 --
>  include/linux/audit_arch.h | 2 ++
>  kernel/audit.h             | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index 31086a72e32a..6a3a9e122bb5 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -130,8 +130,6 @@ extern unsigned compat_dir_class[];
>  extern unsigned compat_chattr_class[];
>  extern unsigned compat_signal_class[];
>  
> -extern int audit_classify_compat_syscall(int abi, unsigned syscall);
> -
>  /* audit_names->type values */
>  #define	AUDIT_TYPE_UNKNOWN	0	/* we don't know yet */
>  #define	AUDIT_TYPE_NORMAL	1	/* a "normal" audit record */
> diff --git a/include/linux/audit_arch.h b/include/linux/audit_arch.h
> index 8fdb1afe251a..0e34d673ef17 100644
> --- a/include/linux/audit_arch.h
> +++ b/include/linux/audit_arch.h
> @@ -21,4 +21,6 @@ enum auditsc_class_t {
>  	AUDITSC_NVALS /* count */
>  };
>  
> +extern int audit_classify_compat_syscall(int abi, unsigned syscall);
> +
>  #endif
> diff --git a/kernel/audit.h b/kernel/audit.h
> index c57b008b9914..94738bce40b2 100644
> --- a/kernel/audit.h
> +++ b/kernel/audit.h
> @@ -259,8 +259,8 @@ extern struct tty_struct *audit_get_tty(void);
>  extern void audit_put_tty(struct tty_struct *tty);
>  
>  /* audit watch/mark/tree functions */
> -#ifdef CONFIG_AUDITSYSCALL
>  extern unsigned int audit_serial(void);
> +#ifdef CONFIG_AUDITSYSCALL
>  extern int auditsc_get_stamp(struct audit_context *ctx,
>  			      struct timespec64 *t, unsigned int *serial);

We probably should move the audit_serial() and auditsc_get_stamp()
away from the watch/mark/tree functions, but that isn't your problem.

Anyway, this looks okay to me; do you have a problem if I merge this
via the audit/next branch or were you hoping to have this go in
through a different tree?

--
paul-moore.com