linux-hardening - Re: [PATCH][next] kgdb: Fix fall-through warning for Clang

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Message-ID: <202106011220.AA0C1482@keescook>
Date:   Tue, 1 Jun 2021 12:20:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] kgdb: Fix fall-through warning for Clang

On Fri, May 28, 2021 at 03:02:22PM -0500, Gustavo A. R. Silva wrote:
> In preparation to enable -Wimplicit-fallthrough for Clang, fix a
> fall-through warning by explicitly adding a goto statement instead
> of letting the code fall through to the next case.
> 
> Link: https://github.com/KSPP/linux/issues/115
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
> JFYI: We had thousands of these sorts of warnings and now we are down
>       to just 25 in linux-next. This is one of those last remaining
>       warnings.

So close! :)

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> 
>  kernel/debug/debug_core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
> index 4708aec492df..431749dd9ab6 100644
> --- a/kernel/debug/debug_core.c
> +++ b/kernel/debug/debug_core.c
> @@ -1038,6 +1038,7 @@ dbg_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
>  	switch (kgdbreboot) {
>  	case 1:
>  		kgdb_breakpoint();
> +		goto done;
>  	case -1:
>  		goto done;
>  	}
> -- 
> 2.27.0
> 

-- 
Kees Cook