Re: [PATCH v4 5/6] fs: provide function to report enum strings

["Serge E. Hallyn" <serge@hallyn.com>]

Quoting Kees Cook (keescook@chromium.org):
> Providing human-readable (and audit-parsable) strings for the READING_*
> enums is needed by some LSMs.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>

> ---
>  fs/exec.c          | 19 +++++++++++++++++++
>  include/linux/fs.h |  1 +
>  2 files changed, 20 insertions(+)
> 
> diff --git a/fs/exec.c b/fs/exec.c
> index c4010b8207a1..05e71b6c0ef0 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -819,6 +819,25 @@ struct file *open_exec(const char *name)
>  }
>  EXPORT_SYMBOL(open_exec);
>  
> +const char *kernel_read_file_id_str(enum kernel_read_file_id id)
> +{
> +	switch (id) {
> +	case READING_FIRMWARE:
> +		return "firmware";
> +	case READING_MODULE:
> +		return "kernel-module";
> +	case READING_KEXEC_IMAGE:
> +		return "kexec-image";
> +	case READING_KEXEC_INITRAMFS:
> +		return "kexec-initramfs";
> +	case READING_POLICY:
> +		return "security-policy";
> +	default:
> +		return "unknown";
> +	}
> +}
> +EXPORT_SYMBOL(kernel_read_file_id_str);
> +
>  int kernel_read(struct file *file, loff_t offset,
>  		char *addr, unsigned long count)
>  {
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 304991a80e23..596b403d5a28 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2589,6 +2589,7 @@ enum kernel_read_file_id {
>  	READING_MAX_ID
>  };
>  
> +extern const char *kernel_read_file_id_str(enum kernel_read_file_id id);
>  extern int kernel_read(struct file *, loff_t, char *, unsigned long);
>  extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
>  			    enum kernel_read_file_id);
> -- 
> 2.6.3