Format specifier issue when building kernel

William Roberts bill.c.roberts at gmail.com
Thu Oct 31 19:25:55 UTC 2013


<snip>

>
> Ugh.  That's not so easy to read...  Slightly longer, how about this?
>
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 8378c5e..3f569d1 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -824,11 +824,13 @@ static int audit_receive_msg(struct sk_buff *skb,
> struct nlmsghdr *nlh)
>                                         break;
>                         }
>                         audit_log_common_recv_msg(&ab, msg_type);
> -                       if (msg_type != AUDIT_USER_TTY)
> -                               audit_log_format(ab,
> -                                                "
> msg='%.AUDIT_MESSAGE_TEXT_MAXs'",
> -                                                (char *)data);
> -                       else {
> +                       if (msg_type != AUDIT_USER_TTY) {
> +                               char fmt[64];
> +                               strcat(fmt, " msg='%.");
> +                               strcat(fmt, "AUDIT_MESSAGE_TEXT_MAX");
> +                               strcat(fmt, "s'");
> +                               audit_log_format(ab, fmt, (char *)data);
> +                       } else {
>                                 int size;
>
>                                 audit_log_format(ab, " data=");
>

I am ok with this. In fact I was going to do this the first time, but I
thought their would be some explicit reason to avoid the additional
run time overhead as the concat could be made at compile time.

<snip>
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